TWI697186B - Converting apparatus and method thereof - Google Patents

Abstract

A converting apparatus includes: a driving device arranged to charge a connecting terminal by a charging signal and to discharge the connecting terminal by a discharging signal for generating a driving signal; a filtering device coupled to the connecting terminal for generating an output voltage according to the driving signal; and a controlling device coupled to the connecting terminal, for receiving the driving signal to generate a control signal; wherein the driving device is arranged to generate the charging signal and the discharging signal according to the control signal.

Description

Conversion device and method

The invention relates to a conversion device and its method.

Converter systems and inverter systems are widely used in electric utility power systems to output from or input to the grid, respectively. A constant on-time (COT) converter is a converter commonly used in wide-input-voltage-range systems. Generally speaking, although COT topology has poor noise immunity and subharmonic problems, its transient performance is good. In addition, the stability of the COT topology is limited by the effective series resistance (ESR) of the output capacitor itself. Therefore, output capacitors with relatively small ESR may not be suitable for COT converters. Traditionally, there are different methods to improve noise immunity and stability. A conventional method uses the inductor current as a compensated ramp signal for injection into a feedback loop. However, this traditional method requires additional sample and hold circuits and may increase the complexity of the COT converter.

The invention provides a conversion device. The conversion device includes a driving device and a filtering device And the control device. The driving device is configured to charge the connection terminal by the charge signal and discharge the connection terminal by the discharge signal to generate a drive signal. The filter device is coupled to the connection terminal to generate an output voltage according to the driving signal. The control device is coupled to the connection end for receiving a driving signal to generate a control signal. The driving device is configured to generate a charging signal and a discharging signal according to the control signal.

100, 800: conversion device

102: Drive

104: filter device

106: control device

108: voltage divider circuit

110: load device

302: dotted line

900, 1000: method

902~1012: Operation

1022: Drive

1024: the first transistor

1026: Second transistor

1042: Inductor

1044: Capacitor

1046: Resistor

1062: The first signal generator

1062a: filter

1062b: Resistor

1062c: current mirror

1062d: Capacitor

1062e: current source

1062f: Switch

1064: Comparator

1066: Second signal generator

1068: First adjustment circuit

1070: Second adjustment circuit

1082: the first resistor

1084: Second resistor

C ₁ : capacitor capacitance

FB: feedback voltage

GND: ground voltage

I _a : average inductor current

I _C: capacitive current

I _charge : charging current

I _discharge : discharge current

I _L : inductor current

I _Load : load current

I _ref : reference current

K _gain : gain

L _x : drive signal

N _c : connection terminal

N _o: output terminal

S _c : charging signal

S _comp : compare signal

S _ctr : control signal

S _c1 : first control signal

S _c2 : second control signal

S _dc : discharge signal

T _OFF : During off

T _ON : during on

t1~t4: time

V _h : high voltage value

V _IN : input voltage

V _os : compensation voltage

V _o1 : output voltage

V _o2 : filter voltage

V _RAMP : the first triangle signal

V _REF : the first reference voltage

V _st : second triangle signal

△i: Surge

△V _ramp : peak-to-peak variation of the first triangle signal V _RAMP

After reading the following embodiments and accompanying drawings, various aspects of the present disclosure can be best understood. It should be noted that according to standard operating habits in the field, various features in the figures are not drawn to scale. In fact, in order to be able to describe clearly, some features may be intentionally enlarged or reduced in size.

FIG. 1 is a schematic diagram of a conversion device according to some embodiments.

FIG. 2 is a schematic diagram of the first signal generator of FIG. 1 according to some embodiments.

FIG. 3 is a timing diagram of a first triangle signal and a driving signal according to some embodiments.

4 is a schematic diagram of the first signal generator of FIG. 2 during the turn-on period of the first transistor according to some embodiments.

FIG. 5 is a schematic diagram of the first signal generator of FIG. 2 during the off period of the first transistor according to some embodiments.

6 is a timing diagram of a driving signal, a first triangle signal, a second triangle signal, and a first reference voltage according to some embodiments.

7 is a timing diagram of the inductor current and the first triangle signal according to some embodiments.

8 is a schematic diagram of a conversion device according to some embodiments.

FIG. 9 is a flowchart according to some embodiments, which illustrates a method of generating an output voltage.

FIG. 10 is a flowchart according to some embodiments, which illustrates a method of generating a ramp signal law.

The following disclosure provides a variety of different embodiments or examples for implementing the various features set forth herein. Specific examples of components and configurations are described below to simplify embodiments of the invention. Of course, these examples are merely illustrative and should not be considered as limitations to the present invention. For example, in the following detailed description, the formation of the first feature above or on the second feature may include an embodiment where the first and second features are formed in direct contact, and may also include the first feature and the second feature. Embodiments in which additional features may be formed so that the first and second features are not in direct contact. In addition, the embodiments of the present invention may repeat element symbols or letters in various examples. This repetition is for simplicity and clarity, and does not itself specify the relationship between the various embodiments and configurations discussed.

The embodiments of the present disclosure are discussed in detail below. However, when understandable, the present disclosure provides many applicable inventive concepts and can be expressed in a variety of textual contexts. The specifics provided here are for illustrative purposes only and should not limit the scope of this disclosure.

In addition, spatial relative terms (such as "beneath", "below", "lower", "above", and "upper" are used in this article. )'', ``higher'', ``left'', ``right'', etc.) to help describe the relative relationship between one element or feature shown in the figure and another element or feature . These spatially relative terms are intended to cover other orientations of the device in use or operation than the orientation depicted in the figure. The device can be placed in other orientations (rotated 90 degrees or other orientations), and the relative description of the space used here can be interpreted accordingly. When it is understandable that when an element is pointed to be “connected to” or “coupled to” another element, it may be directly connected or coupled to another element, or it may have an intermediate element.

Although the numerical ranges and parameters describing the wide range of the embodiments of the present invention are approximate values, in specific examples, the numerical values set forth are reported as accurately as possible. However, any value inherently contains certain errors that must be caused by the standard deviation found in the corresponding test measurement. In addition, as used herein, the term "about" generally means within 10%, 5%, 1%, or 0.5% of a given value or range. Alternatively, when considered by those of ordinary skill in the art, the term "about" means within an acceptable standard error of the mean. Except in operating or working examples, or unless expressly specified otherwise, all numerical ranges, amounts, values, and percentages (such as number of materials, duration, temperature, operating conditions, amount ratios, and the like disclosed herein) should be It is understood to be modified by the term "about" in all examples. Therefore, unless indicated to the contrary, the numerical parameters set forth in the embodiments of the present invention and the appended patent application are approximate values that can be changed as needed. At a minimum, each numerical parameter should be interpreted based on at least multiple reported significant digits and by applying ordinary rounding techniques. Ranges can be expressed herein from one endpoint to another endpoint or between two endpoints. Unless otherwise specified, all ranges disclosed herein are inclusive.

FIG. 1 is a schematic diagram of a conversion device 100 according to some embodiments. The conversion device 100 includes a fixed on-time (COT) converter configured to generate and supply power to a circuit system. Referring to FIG. 1, the conversion device 100 includes a driving device 102, a filtering device 104, a control device 106 and a voltage dividing circuit 108. The driving device 102 is configured to charge a connection terminal N _c in response to the charging signal S _c and discharge the connection terminal N _{c in} response to the discharge signal S _dc to generate a driving signal L _x . The filtering device 104 is coupled to the connection terminal N _c to generate an output voltage V _o1 according to the driving signal L _x . The filtering device 104 may be a low-pass filtering device. The control device 106 is coupled to the connection terminal N _c , which is used to receive the driving signal L _x in order to generate the control signal S _ctr . The driving means 102 is arranged to generate a charging signal S _c and S _dc discharge signal in accordance with a control signal S _ctr.

The voltage divider circuit 108 is coupled to the filtering device 104 to generate a feedback voltage FB according to the output voltage _Vo1 . The voltage dividing circuit 108 includes a first resistor 1082 and a second resistor 1084. 1082 of the first resistor and the second resistor 1084 in series between the output terminal N _o and the ground voltage GND. The feedback voltage FB is output at a node between the first resistor 1082 and the second resistor 1084. During the operation of converting means 100, a current I _Load load device 110 may be coupled to the output terminal N _o.

According to some embodiments, the driving device 102 includes a driver 1022, a first transistor 1024, and a second transistor 1026. The first transistor 1024 may be a high-side field effect transistor (FET). The second transistor 1026 may be a low-side FET. According to some embodiments, the first transistor 1024 and the second transistor 1026 are N-channel metal-oxide-semiconductor field effect transistors (MOSFETs). The driver 1022 is arranged to generate a first control signal S _c1 and S _c2 of the second control signal to the control signal S _ctr. The driver 1022 may be a buck converter. The source of the first transistor 1024 is coupled to the connection terminal N _c to generate the charging signal S _c according to the first control signal S _c1 . The drain of the first transistor 1024 is coupled to the input voltage V _IN . The drain of the second transistor 1026 is coupled to the connection terminal N _c to generate the discharge signal S _dc according to the second control signal S _c2 . The source of the second transistor 1026 is coupled to the ground voltage GND.

According to some embodiments, the control device 106 includes a first signal generator 1062, a comparator 1064, a second signal generator 1066, a first adjustment circuit 1068, and a second adjustment circuit 1070. The first signal generator 1062 is configured to generate a first triangular signal V _RAMP according to the input voltage V _IN and the driving signal L _x . The first signal generator 1062 may be a ramp signal generator. The first adjustment circuit 1068 is coupled to the first signal generator 1062 and the voltage divider circuit 108 to generate the compensation voltage V _os according to the feedback voltage FB, the first triangle signal V _RAMP and the first reference voltage V _REF . The first adjustment circuit 1068 may be an offset cancellation circuit. The second adjustment circuit 1070 is coupled to the first signal generator 1062 and the first adjustment circuit 1068 to generate the second triangle signal V _st according to the feedback voltage FB, the first triangle signal V _RAMP and the compensation voltage V _os . The second adjustment circuit 1070 may be an addition circuit. The comparator 1064 is coupled to the second adjustment circuit 1070 for outputting the comparison signal S _comp according to the second triangle signal V _st and the first reference voltage V _REF . The second signal generator 1066 is coupled to the comparator 1064 to generate the control signal S _ctr according to the comparison signal S _comp . The second signal generator 1066 may be a COT generator.

According to some embodiments, the filtering device 104 includes an inductor 1042 and a capacitor 1044. The inductor 1042 has a first end, which is coupled to the connection end N _c . The capacitor 1044 has a first end which is coupled to a system of a second end of the inductor 1042 (i.e., the output terminal N _o), for outputting an output voltage V _o1. Resistors 1046 and 1044 may be provided in the capacitor output (i.e., a second end of the inductor 1042 N _o) between. The resistor 1046 may be an effective series resistance (ESR) of the capacitor 1044.

FIG. 2 is a schematic diagram of the first signal generator 1062 according to some embodiments. The first signal generator 1062 includes a filter 1062a, a resistor 1062b, a current mirror 1062c, a capacitor 1062d, a current source 1062e, and a switch 1062f. The filter 1062a is coupled to the connecting terminal N _c, filtered voltage to produce the driving signal V _o2 L _x. The filter 1062a may be a low-pass filter. According to some embodiments, the structure of the filter 1062a is similar to or the same as that of the filtering device 104, so the filtered voltage V _{o2 is} similar to the output voltage V _o1 . The resistor 1062b is coupled to the input voltage V _IN . The reference current I _ref is generated based on the filtered voltage V _o2 , the input voltage V _IN and the resistor 1062b. The current mirror 1062c has a first input terminal coupled to the resistor 1062b, a second input terminal for receiving the filtered signal _Vo2 , and an output for providing a charging current I _charge according to the gain K _{gain of the} current mirror 1062c end. The capacitor 1062d is coupled to the output terminal of the current mirror 1062c for outputting the first triangular signal V _RAMP according to the charging current I _charge . The current source 1062e is coupled to the output terminal of the current mirror 1062c for reducing the voltage value of the first triangular signal V _RAMP . The current source 1062e is configured to have a discharge current I _discharge proportional to the filtered signal V _o2 or the output voltage V _o1 . In addition, the discharge current I _{discharge is} proportional to the K _{gain of the} current mirror 1062c and inversely proportional to the resistance value of the resistor 1062b. The switch 1062f is coupled to the output terminal of the current mirror 1062c for selectively coupling the voltage value of the first triangular signal V _RAMP to the second reference voltage. For simplicity here, the control signal of the switch 1062f is omitted. The second reference voltage may be the ground voltage GND of the conversion device 100.

According to some embodiments, converter 100 is arranged to generate a pulse width adjustment signal connection N _c, i.e., the drive signal L _x. FIG. 3 is a timing diagram of the first triangular signal V _RAMP and the driving signal L _x according to some embodiments. According to some embodiments, during the charging period, the first transistor 1024 is turned on, and the second transistor 1026 is turned off. During the discharge period, the first transistor 1024 is turned off, and the second transistor 1026 is turned on. When the first control signal S _c1 turns on the first transistor 1024, the voltage value of the connection terminal N _c is charged to a high voltage value V _h . The high voltage value V _{h may} be close to the input voltage V _IN . When the second control signal S _c2 turns on the second transistor 1026, the voltage value of the connection terminal N _c is pulled down to the ground voltage GND.

When the voltage value of the driving signal L _x is a high voltage value V _h , a charging current I _charge is generated to charge the capacitor 1062d, so that during the turn-on period of the first transistor 1024 (eg, time interval t1~t2 in FIG. 3) The voltage value of the first triangle signal V _RAMP is ramped up, and the above-mentioned turn-on period is a fixed time. The charging current I _charge can be expressed by the following equation (1):

The parameter R _TON is the resistance value of the resistor 1062b. FIG. 4 is a schematic diagram of the first signal generator 1062 during the _ON period of the first transistor 1024 according to some embodiments. The filter 1062a is arranged to low pass filtering procedure upon receipt of the drive signal L _x, to produce a filtered voltage V _o2. According to some embodiments, the filtered voltage _Vo2 is substantially equal to the output voltage _Vo1 . It should be noted that when the charging current I _charge charges the capacitor 1062d, the current source 1062e and the switch 1062f are decoupled/disconnected from the output terminal of the current mirror 1062c. Therefore, FIG. 4 does not show the current source 1062e and the switch 1062f.

In addition, due to the operation of the first transistor 1024 during the ON period T _ON , the following equation (2) can be obtained:

The parameter C ₁ is the capacitance of the capacitor 1062d. The parameter Δv is the peak-to-peak variation of the first triangular signal V _RAMP . Parameter D is the duty cycle of the driving signal of L _x. The parameter T _s is the period of the driving signal L _x . The parameter F _SW is the frequency of the drive signal L _x .

When the voltage value of the driving signal L _x is changed to the ground voltage GND, the discharge current I _discharge is set to _discharge the capacitor 1062d, so that the voltage value of the first triangular signal V _RAMP is during the off period T _{OFF of the} first transistor 1024 (For example, the time interval t2 to t3 in FIG. 3) (or the turn-on period of the second transistor 1026) ramps down. The discharge current I _discharge can be expressed by the following equation (3):

The parameter R _discharge can be regarded as the resistance value. FIG. 5 is a schematic diagram of the first signal generator 1062 during the T _OFF period of the first transistor 1024 according to some embodiments. It should be noted that when the discharge current I _{discharge discharges} the capacitor 1062d, the filter 1062a, the resistor 1062b, and the current mirror 1062c are decoupled/disconnected from the output terminal of the capacitor 1062d. Therefore, FIG. 5 does not show the filter 1062a, the resistor 1062b, and the current mirror 1062c.

Due to the operation of the first transistor 1024 during the off period T _OFF (or the second transistor 1026 during the on period), the following equation (4) can be obtained:

According to equations (2), (3) and (4), the following equation (5) can be obtained:

Therefore, the predetermined resistance value R _discharge depends on the resistance value R _TON of the resistor 1062b and the gain K _{gain of the} current mirror 1062c. The predetermined resistance value R _{discharge is} independent of the input voltage V _IN , the frequency of the drive signal L _x and the output voltage V _o2 .

In addition, if the voltage value of the first triangle signal V _RAMP does not reach the ground voltage GND before the first transistor 1024 is turned on, the switch 1062f is controlled to be turned on to pull the voltage value of the first triangle signal V _RAMP to ground Voltage GND. In other words, when the first transistor 1024 is turned on, the switch 1062f is set to force the voltage value of the first triangular signal V _RAMP to become the ground voltage GND. Therefore, when the first transistor 1024 is turned on, the voltage value of the first triangle signal V _RAMP may start from the ground voltage GND. For example, as shown in FIG. 3, if at time t4, the voltage value of the first triangular signal V _RAMP (ie, dashed line 302) does not reach the ground voltage GND, then at time t4, the switch 1062f is turned on to turn the first The voltage value of the triangle signal V _RAMP is pulled to the ground voltage GND. Therefore, during the discharge period, the control signal (not shown) of the switch 1062f depends on the voltage value of the first triangular signal V _RAMP .

When the first triangular signal V _RAMP is generated, the first triangular signal V _{RAMP is} transferred to the first adjustment circuit 1068 to generate an offset cancellation voltage (ie, the compensation voltage V based on the feedback voltage FB and the first reference voltage V _{REF os} ). The first adjustment circuit 1068 is configured to eliminate the ripple offset of the conversion device 100. Thus, the adjustment accuracy of the output voltage _Vo1 can be improved.

After that, the second adjustment circuit 1070 receives and sums the feedback voltage FB, the first triangle signal V _RAMP and the compensation voltage V _os to generate the second triangle signal V _st . 6 is a timing diagram of the driving signal L _x , the first triangular signal V _RAMP , the second triangular signal V _st, and the first reference voltage V _REF according to some embodiments. It can be seen from the figure that the driving signal L _x , the first triangular signal V _RAMP and the second triangular signal V _st are three in-phase signals. For example, when the voltage value of the driving signal L _x is a high voltage value, the voltage values of both the first triangle signal V _RAMP and the second triangle signal V _st are increasing. When the voltage value of the driving signal L _x is a low voltage value, the voltage values of both the first triangle signal V _RAMP and the second triangle signal V _st will decrease. Therefore, the feedback loop from the driving signal L _x to the second triangular signal V _st is relatively stable.

Referring again to FIGS. 3-6, when, for example, at time t1, the voltage value of the second triangular signal V _st reaches the first reference voltage V _REF , the comparator 1064 outputs the comparison signal S _comp to control the second signal generator 1066 to generate the control signal S _ctr . After that, the driver 1022 generates a first control signal S _c1 according to the control signal S _ctr to turn on the first transistor 1024, and generates a second control signal S _c2 to turn off the second transistor 1026. At time t1, the voltage value of the driving signal L _x is changed to the input voltage V _IN , and the voltage value of the first triangle signal V _RAMP starts to increase, as shown in FIG. 3.

According to some embodiments, the first triangular signal V _RAMP may be regarded as a compensated ramp signal for injection into the feedback loop (ie, 106) of the conversion device 100. The first triangular signal V _RAMP is generated using the input voltage V _IN and the driving signal L _x instead of using the inductor current I _L. However, the variation of the first triangular signal V _RAMP is similar to the variation of the inductor current _IL through the inductor 1042, as shown in FIG. 7. 7 is a timing diagram of the inductor current _IL and the first triangle signal V _RAMP according to some embodiments. Inductor current I _L has an average inductor current I _a, and the inductor current I _L is the ripple △ i. As shown in FIG. 7, the variation of the first triangular signal V _RAMP is similar to the ripple of the inductor current _IL . Furthermore, according to some embodiments, during the discharging period (ie, T _OFF ), the voltage value of the first triangular signal V _RAMP always decreases to the ground voltage GND, and during the charging period (ie, T _ON ), the first triangular signal The voltage value of V _RAMP always starts from the ground voltage GND. Thus, the complexity of the conversion device 100 can be reduced because the sample-and-hold circuit in the feedback loop can be omitted. Furthermore, since the first triangle signal V _RAMP does not have a direct current (DC) component like the inductor current with increasing load, the slope of the first triangle signal V _RAMP can be adaptively controlled. It should be noted that in the existing scheme, the inductor current is used as slope compensation to inject into the feedback loop, and a sample-and-hold circuit is required to separate the AC (alternating current) and DC components of the inductor current.

FIG. 8 is a schematic diagram of a conversion device 800 according to some embodiments. The conversion device 800 is a simplified version of the conversion device 100, assuming that the resistance value of the resistor 1046 is zero or close to zero. Therefore, the following design criteria (6) of the conversion device 100 can be obtained:

The parameter ΔV _ramp is the peak-to-peak variation of the first triangular signal V _RAMP , as shown in FIG. 3. The parameter C is the capacitance of the capacitor 1044. The parameter dvc/dt is the slope of the voltage change across the capacitor 1044. The parameter R ₁ is the resistance value of the first resistor 1082. The parameter R ₂ is the resistance value of the second resistor 1084. The parameter _IL is the current flowing through the inductor 1042. I _C parameter is the current through the capacitor 1044. According to category (6), when the peak-to-peak variation of the first triangular signal V _RAMP is equal to or greater than a predetermined value, the conversion device 800 can remain stable.

In short, the operation summary of the conversion device 100 can be organized into operations 902-916 of FIG. 9. 9 is a flowchart illustrating a method 900 for generating an output voltage _Vo1 according to some embodiments. At operation 902, providing a driving means 102, to charge connection terminal N _c in the charging time by the charging signal S _c, and a pair of terminals N _c is discharged by the discharge signal S _dc inside the discharge time to generate a drive signal L _x.

In operation 904, the drive signal by L _x LC filter for low-pass filtering, to produce an output voltage V _o1.

In operation 906, the feedback voltage FB is generated by dividing the output voltage _Vo1 .

In operation 908, a first triangular signal V _{RAMP is} generated according to the input voltage V _IN and the driving signal L _x .

In operation 910, the compensation voltage V _os is generated according to the feedback voltage FB, the first triangle signal V _RAMP and the first reference voltage V _REF .

In operation 912, the second triangular signal V _{st is} generated by summing the feedback voltage FB, the first triangular signal V _RAMP and the compensation voltage V _os .

In operation 914, by comparing the second triangular signal V _st with the first reference voltage V _REF , a comparison signal S _comp is generated to control the COT generator.

In operation 916, a control signal S _ctr is generated according to the comparison signal S _comp to control the driving device 102 in operation 902.

In addition, the operation summary of the first signal generator 1062 can be organized into operations 1002 to 1012 in FIG. 10. FIG. 10 is a flowchart illustrating a method 1000 for generating a ramp signal according to some embodiments. The ramp signal may be, for example, the first triangular signal V _RAMP shown in FIG. 3. In operation 1002, the filter voltage V _o2 is generated by low-pass filtering the drive signal L _x .

In operation 1004, a reference current I _ref is generated according to the filtered voltage V _o2 , the input voltage V _IN and the resistor 1062b.

In operation 1006, the reference current I _ref is mapped by the current mirror to generate the charging current I _charge according to the gain K _gain .

In operation 1008, the charging current I _charge is set to _charge the capacitor 1062d to generate a rising ramp of the first triangular signal V _RAMP .

In operation 1010, the discharge current I _discharge is set to _discharge the capacitor 1062d to generate the falling ramp of the first triangular signal V _RAMP according to the predetermined resistance value R _discharge and the filter voltage V _o2 .

In operation 1012, a first triangular signal V _RAMP having a ripple similar to the inductor current _IL is generated.

In short, the present invention provides a ramp signal (eg, V _RAMP ) having a ripple similar to the inductor current _IL , and the ramp signal does not need to have a DC component like the inductor current increasing with the load. Therefore, the sample-and-hold circuit can be omitted. In addition, since the ramp signal does not have this DC component, the slope of the ramp signal can be adaptively controlled.

According to some embodiments, a conversion device is proposed. The conversion device includes a driving device, a filtering device, and a control device. The driving device is configured to charge the connection terminal by the charge signal and discharge the connection terminal by the discharge signal to generate a drive signal. The filter device is coupled to the connection terminal to generate an output voltage according to the driving signal. The control device is coupled to the connection end for receiving a driving signal to generate a control signal. The driving device is configured to generate a charging signal and a discharging signal according to the control signal.

According to some embodiments, a method of generating an output voltage is proposed. The method includes: using a driving device to charge a connection terminal from a charge signal and discharge a connection terminal from a discharge signal to generate a drive signal; filter the drive signal to generate an output voltage; receive the drive signal to generate a control signal; and according to the control signal Generate charging and discharging signals.

The above description briefly proposes the features of some embodiments of the present invention, so that those with ordinary knowledge in the technical field to which the present invention pertains can more fully understand the various aspects of the present disclosure. Those of ordinary skill in the technical field to which the present invention pertains will understand that they can easily use this disclosure as a basis to design or change other processes and structures to achieve the same purposes and/or achieve the same as the embodiments described herein The same advantages. Those of ordinary skill in the technical field to which the present invention pertains should also understand that these equal embodiments still belong to the spirit and scope of the present disclosure, and that they can make various changes, substitutions, and alterations without departing from the spirit and scope of the present disclosure range.

100‧‧‧Conversion device

102‧‧‧Drive

104‧‧‧filter device

106‧‧‧Control device

108‧‧‧Voltage dividing circuit

110‧‧‧ Load device

1022‧‧‧Drive

1024‧‧‧ First transistor

1026‧‧‧second transistor

1042‧‧‧Inductor

1044‧‧‧Capacitor

1046‧‧‧resistor

1062‧‧‧ First signal generator

1064‧‧‧Comparator

1066‧‧‧Second signal generator

1068‧‧‧ First adjustment circuit

1070‧‧‧ Second adjustment circuit

1082‧‧‧ First resistor

1084‧‧‧Second resistor

FB‧‧‧Feedback voltage

GND‧‧‧Ground voltage

I _L ‧‧‧ Inductance current

I _Load ‧‧‧ Load current

L _x ‧‧‧ drive signal

N _c ‧‧‧ connector

N _o ‧‧‧ output

S _c ‧‧‧ Charging signal

S _comp ‧‧‧ comparison signal

S _ctr ‧‧‧Control signal

S _c1 ‧‧‧ First control signal

S _c2 ‧‧‧ Second control signal

S _dc ‧‧‧Discharge signal

V _IN ‧‧‧ input voltage

V _os ‧‧‧ Compensation voltage

V _o1 ‧‧‧ output voltage

V _RAMP ‧‧‧ First triangle signal

V _REF ‧‧‧ First reference voltage

V _st ‧‧‧ Second triangle signal

Claims (17)

A conversion device includes: a driving device configured to cause a current to flow to a connecting terminal through a charging signal and a current to flow out from the connecting terminal through a discharging signal to generate a driving signal; and a filtering device coupled to the The connection terminal generates an output voltage according to the driving signal; and a control device coupled to the connection terminal for receiving the driving signal to generate a control signal; wherein the driving device is configured to generate the output voltage according to the control signal The charging signal and the discharging signal, wherein the driving device includes: a driver configured to generate a first control signal and a second control signal according to the control signal; a first transistor, coupled to the connection terminal, according to The first control signal and an input voltage generate the charging signal; and a second transistor coupled to the connection terminal to generate the discharge signal according to the second control signal; wherein the control device includes: a first signal The generator is configured to generate a first triangular signal according to the input voltage and the driving signal; a comparator, coupled to the first signal generator, is used to output a first triangular signal according to the first triangular signal and a first reference voltage Compare signals; and A second signal generator is coupled to the comparator to generate the control signal according to the comparison signal, wherein the first signal generator includes: a filter coupled to the connection terminal to generate a control signal according to the driving signal A filter voltage; a resistor coupled to the input voltage; a current mirror having a first input terminal coupled to the resistor, a second input terminal receiving the filtered voltage, and a current mirror A gain generates an output terminal of a charging current; and a capacitor, coupled to the output terminal of the current mirror, is used to output the first triangular signal according to the charging current. The conversion device according to claim 1, wherein the filtering device includes: an inductor having a first end coupled to the connection end; and a capacitor having a first end coupled to the A second terminal of the inductor is used to output the output voltage. The conversion device according to claim 1, further comprising: a voltage divider circuit, coupled to the filtering device, to generate a feedback voltage according to the output voltage; wherein the control device further includes: A first adjustment circuit, coupled to the first signal generator and the voltage divider circuit, to generate a compensation voltage according to the feedback voltage, the first triangle signal and the first reference voltage; and a second adjustment circuit , Coupled to the first signal generator and the first adjustment circuit, to generate a second triangular signal based on the feedback voltage, the first triangular signal and the compensation voltage; wherein the comparator is based on the second triangular signal and The first reference voltage outputs the comparison signal. The conversion device according to claim 1, wherein the current mirror is set to increase a voltage value of the first triangle signal. The conversion device according to claim 1, wherein the first signal generator further comprises: a current source, coupled to the output terminal, for reducing a voltage value of the first triangular signal. The conversion device according to claim 5, wherein the current source is set to have a current proportional to the output voltage. The conversion device according to claim 6, wherein the current is inversely proportional to a resistance value of one of the resistors. The conversion device according to claim 6, wherein the current is proportional to the gain of the current mirror. The conversion device according to claim 5, wherein the first signal generator further comprises: a switch, coupled to the output end of the current mirror, for selectively coupling the voltage value of the first triangular signal Connected to a second reference voltage. A method for generating an output voltage, comprising: using a driving device to cause a charging current to flow to a connecting terminal through a charging signal and a discharging signal to cause a discharging current to flow out from the connecting terminal to generate a driving signal; filtering The driving signal is used to generate the output voltage; the driving signal is received to generate a control signal; and the charging signal and the discharging signal are generated according to the control signal, wherein the driving device includes: a driver configured to operate according to the control signal A first control signal and a second control signal are generated; a first transistor is coupled to the connection terminal to generate the charging signal according to the first control signal and an input voltage; and a second transistor is coupled Connected to the connection end to generate the discharge signal according to the second control signal; wherein the step of receiving the drive signal to generate the control signal includes: generating a first triangle signal according to the input voltage and the drive signal; Output a comparison signal according to the first triangle signal and a first reference voltage; and generate the control signal according to the comparison signal, wherein the method further comprises: dividing the output voltage to generate a feedback voltage; wherein the driving signal is received The step of generating the control signal further includes: generating a compensation voltage based on the feedback voltage, the first triangle signal and the first reference voltage; and generating a compensation voltage based on the feedback voltage, the first triangle signal and the compensation voltage A second triangle signal; wherein the comparison signal is generated by comparing the second triangle signal with the first reference voltage. The method of claim 10, wherein the step of generating the first triangular signal according to the input voltage and the driving signal comprises: filtering the driving signal on the connection terminal to generate a filtered voltage; based on the filtered voltage, the input The voltage and a resistor generate a reference current; reflect the reference current according to a gain to generate a charging current; and output the first triangular signal on a capacitor according to the charging current. The method according to claim 11, wherein the step of generating the first triangular signal according to the input voltage and the driving signal further comprises: The charging current is set to charge the capacitor to increase a voltage value of the first triangle signal. The method according to claim 11, wherein the step of generating the first triangle signal according to the input voltage and the driving signal further comprises: setting a current source to reduce a voltage value of the first triangle signal. The method of claim 13, wherein a current of the current source is proportional to the output voltage. The method of claim 14, wherein the current is inversely proportional to the resistance value of one of the resistors. The method of claim 14, wherein the current is proportional to the gain. A conversion device includes: a driving device configured to cause a charging current to flow to a connecting terminal through a charging signal and a discharging current to flow out from the connecting terminal through a discharging signal to generate a driving signal; and a filtering device, Coupled to the connection end, generating an output voltage according to the drive signal; and a control device, coupled to the connection end, for receiving the drive signal to generate a control signal; The driving device is configured to generate the charging signal and the discharging signal according to the control signal. The driving device includes: a driver configured to generate a first control signal and a second control signal according to the control signal; a first A transistor, coupled to the connection terminal, to generate the charging signal according to the first control signal and an input voltage; and a second transistor, coupled to the connection terminal, to generate the second control signal Discharge signal; wherein the control device includes: a first signal generator configured to generate a first triangular signal based on the input voltage and the drive signal; a comparator coupled to the first signal generator for The first triangular signal and a first reference voltage output a comparison signal; and a second signal generator coupled to the comparator to generate the control signal according to the comparison signal, wherein the conversion device further includes: a A voltage divider circuit, coupled to the filter device, to generate a feedback voltage according to the output voltage; wherein the control device further includes: a first adjustment circuit, coupled to the first signal generator and the voltage divider circuit To generate a compensation voltage based on the feedback voltage, the first triangle signal and the first reference voltage; and A second adjustment circuit, coupled to the first signal generator and the first adjustment circuit, to generate a second triangle signal based on the feedback voltage, the first triangle signal and the compensation voltage; wherein the comparator is based on the The second triangle signal and the first reference voltage output the comparison signal.

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