TWI551015B - The ripple adjustment device with frequency tracking function - Google Patents

Description

Chopper adjustment device with frequency tracking function

The present invention relates to a device, and more particularly to a chopper adjustment device for controlling output power and having a frequency tracking function.

In recent years, in the control technology of power output, due to:

1. The existing chopping control technology controls the signal frequency of the power output stage to increase with the load, and the larger the signal frequency, the smaller the load and the smaller the signal frequency, the inability to operate at a fixed frequency, increasing the electromagnetic interference effect, and also causing Technical design for filtering electromagnetic interference is difficult.

2. The frequency control technology of the existing power supply, the frequency-to-current (or voltage) circuit and the integrating amplifier with capacitance feedback, the large capacitance used increases the chip area and reduces the speed of the frequency response.

How to solve the above problems is the current research direction.

Accordingly, it is an object of the present invention to provide a chopper adjustment apparatus that solves the above problems by adjusting the on-time and has a frequency tracking function.

Thus, the chopper adjustment apparatus of the present invention comprises a power output stage, a chopper control stage and a frequency tracking stage.

The power output stage receives an input voltage and a switch control signal and generates an output voltage, and converts the input voltage into the output voltage according to the switch control signal.

The chopper control stage receives a termination trigger and electrically connects the power output stage to determine whether the value of the output voltage is less than a preset output value to determine when to generate a start trigger, and generates the switch according to the start trigger and the termination trigger And a control signal, wherein an on-time of the switch control signal is related to a time difference between a generation time point of the start trigger and a reception time point of the termination trigger.

The frequency tracking stage receives a reference clock signal and electrically connects the chopping stage to determine whether a cycle time of the switch control signal is equal to a cycle time of the reference clock signal to determine when the termination trigger is generated.

Another object of the present invention is to provide a chopper adjusting device that adjusts the off time to solve the above problem and has a frequency tracking function.

The chopper adjusting device with frequency tracking function of the invention comprises a power output stage, a chopper control stage and a frequency tracking stage.

The power output stage receives an input voltage and a switch control signal and generates an output voltage, and converts the input voltage into the output voltage according to the switch control signal.

The chopper control stage receives a termination trigger and electrically connects the power output stage to determine whether the value of the output voltage is greater than a predetermined output value to determine when to generate a start trigger, and generates the switch according to the start trigger and the termination trigger And a control signal, wherein a turn-off time of the switch control signal is related to a time difference between a start time point of the start trigger and a receive time point of the end trigger.

The frequency tracking stage receives a reference clock signal and electrically connects the chopping control stage to determine whether the cycle time of the switch control signal is equal to the cycle time of the reference clock signal to determine when the termination trigger is generated.

The effect of the present invention is to lock the frequency at a fixed frequency so that the technique of filtering electromagnetic interference is easier to design, and the wafer area can be saved and the speed of the frequency response can be accelerated.

2‧‧‧Power output stage

Vo‧‧‧ output voltage

Io‧‧‧ output current

Vin‧‧‧Input voltage

3‧‧‧Chopper control level

31‧‧‧Detector

Rf1‧‧‧first resistance

Rf2‧‧‧second resistance

32‧‧‧Second comparator

33‧‧‧SR latch

S‧‧‧Setting end

R‧‧‧Reset end

Q‧‧‧output

‧‧‧inverting output

34‧‧‧ drive

Vref‧‧‧reference voltage

Set‧‧‧ starts to trigger

Reset‧‧‧Terminate trigger

GD‧‧‧ switch control signal

‧‧‧Inverted switch control signal

4‧‧‧frequency tracking level

41‧‧‧Frequency phase detector

42‧‧‧ On-time generator

47‧‧‧Close time generator

A1‧‧‧First comparator

A2‧‧‧voltage to current circuit

C1‧‧‧ capacitor

S2‧‧‧ switch

A3‧‧‧Window Voltage Range Comparator

Vsaw‧‧‧ sawtooth voltage

VDD‧‧‧Power supply voltage

VH‧‧‧ high level voltage

VL‧‧‧low level voltage

43‧‧‧Divider

44‧‧‧High level comparator

45‧‧‧Low level comparator

46‧‧‧SR latch

I _FTC ‧‧‧frequency tracking current

V _FTC ‧‧‧frequency tracking voltage

5‧‧‧ counter

6‧‧‧ Analog to Digital Converter

7‧‧‧Following counter

UP‧‧‧Upper signal

DOWN‧‧‧Digital signal

CLKref‧‧‧ reference clock signal

T _ON ‧‧‧ On time

T _OFF ‧‧‧Closed time

Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is a block diagram of a first embodiment of a chopper adjustment device having a frequency tracking function according to the present invention; 2 is a circuit diagram of the first embodiment; FIG. 3 is a flowchart of a method for performing a tracking frequency in the first embodiment; FIG. 4 is a timing in which the first embodiment operates in a period in which the load is changed from light load to heavy load. Figure 5 is a timing diagram of the first embodiment operating in a transient period in which the load is switched from a light load to a heavy load; 6 is a timing chart of the first embodiment operating in a transient period in which the load is rapidly changed from a heavy load to a light load; and FIG. 7 is a circuit diagram of a second embodiment of the chopper adjusting device having the frequency tracking function of the present invention. 8 is a flow chart of a method for performing a tracking frequency in the second embodiment; FIG. 9 is a timing chart of the second embodiment operating during a load from a heavy load to a light load; FIG. 10 is a frequency tracking method of the present invention; A circuit diagram of a third embodiment of a functional chopper adjustment apparatus; FIG. 11 is a circuit diagram of a fourth embodiment of a chopper adjustment apparatus having a frequency tracking function according to the present invention; and FIG. 12 is a fourth embodiment operating on a load FIG. 13 is a circuit diagram of a fifth embodiment of a chopper adjusting device having a frequency tracking function according to the present invention; and FIG. 14 is a fifth embodiment operating on a load Loaded into a timing diagram during the heavy load period.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

<First Embodiment>

Referring to Figures 1 and 2, a first embodiment of the chopper adjustment apparatus of the present invention having a frequency tracking function includes a power output stage 2, a chopper control stage 3, and a frequency tracking stage 4.

The power output stage 2 generates an output voltage Vo and an output current Io to a load, and receives an input voltage Vin and a switch control signal GD, and converts the input voltage Vin into the output voltage Vo according to the switch control signal GD. The one cycle time Tsw of the switch control signal GD includes an on time T _ON and a off time T _OFF (the ratio of the on time T _ON to the cycle time Tsw is also called the duty ratio duty ratio), Tsw=T _ON + T _OFF , that is, how much energy is compensated by the input voltage Vin to the output voltage Vo according to the on-time T _ON . When the amount of change of the load is gradually changed from the light load to the heavy load period, the output current Io gradually increases with the amount of change of the load, and the time difference between the generation time point of the start trigger and the reception time point of the termination trigger gradually increases. The on-time T _{ON of} the switch control signal GD gradually increases, and the cycle time Tsw of the switch control signal GD gradually increases.

The chopper control stage 3 receives a termination trigger Reset, and electrically connects the power output stage 2 to determine whether the value of the output voltage Vo is less than a preset output value to determine when to generate a start trigger, and according to the start trigger and the termination Triggering Reset generates the switch control signal GD, wherein an on-time T _{ON of} the switch control signal GD is related to a time difference between a generation time point of the start trigger set and a reception time point of the termination trigger Reset.

The frequency tracking stage 4 receives a reference clock signal CLKref and electrically connects the chopping control stage 3 to determine whether a cycle time of the switch control signal GD is equal to a cycle time of the reference clock signal CLKref to determine when to generate the termination trigger. Reset, the increase or decrease of the cycle time of the switch control signal GD follows the increase and decrease of its on-time. As will be further explained below, as shown in FIG. 3, a method for tracking frequency is performed in this embodiment. When the cycle time of the switch control signal GD and the reference clock signal CLKref are the same, it indicates that the load remains unchanged. If the cycle time is different, it means that the load changes. The following will be discussed in two situations:

When the load is changed from light load to heavy load, the output voltage Vo drops faster because the current drawn by the load increases, and the chopper control stage 3 that detects this situation needs to quickly drive the power output stage 2 to pull back the output. The voltage Vo is accelerated to generate the frequency of the switch control signal GD such that the cycle time Tsw of the switch control signal GD is < the cycle time Tref of the reference clock signal CLKref, and the frequency tracking stage 4 is to reduce the frequency of the switch control signal GD to the same reference The frequency of the clock signal CLKref is adjusted to lower the frequency tracking voltage V _FTC ↓ so that the on-time of the switching control signal GD rises T _ON ↑, and the cycle time Tsw=T _ON +T _{OFF of the} switching control signal GD is increased. Among them, the parameter T _OFF is the off time.

During the period from the heavy load to the light load, the frequency tracking stage detects the cycle time Tsw of the switch control signal > the cycle time Tref of the reference clock signal, and the frequency tracking stage 4 pulls the frequency of the switch control signal GD to Similarly to the frequency of the reference clock signal CLKref, the frequency tracking voltage V _FTC增加 is increased, and the on-time TON 开关 of the switching control signal GD is lowered, and the cycle time Tsw=T _ON +T _{OFF of the} switching control signal GD is reduced.

Referring to FIG. 2, the detailed components of the chopper control stage 3 and the frequency tracking stage 4 are further described. The chopper control stage 3 includes a detector 31, a second comparator 32, and an SR latch. 33 and a driver 34.

The detector 31 detects the output voltage Vo to generate a detection voltage proportional to the output voltage. The detector 31 has a first resistor Rf1 and a second resistor Rf2 connected in series.

The second comparator 32 has an inverting input terminal (-) electrically connected to the detector 31 for receiving the detection voltage, and a non-inverting input terminal receiving a reference voltage Vref proportional to the preset output value. (+), when the detection voltage is less than the reference voltage Vref, the start trigger set is generated, wherein the ratio of the reference voltage Vref to the preset output value is equal to the ratio of the detected voltage to the output voltage Vo, and the ratio is related The ratio of the first and second resistors Rf1, Rf2.

The SR latch 33 has a set terminal S electrically connected to the second comparator 32 to receive the start trigger set, a reset terminal R electrically connected to the frequency tracking stage 4 to receive the termination trigger Reset, and an output switch. An output terminal Q of the control signal GD and an output of the inverted switch control signal Inverting output .

The driver 34 is electrically connected to the output terminal Q of the SR latch 33 to receive the switch control signal GD, and amplifies the level of the switch control signal GD to enhance the driving capability, and then outputs the power to the power output stage 2.

The frequency tracking stage 4 includes a frequency phase detector 41 and an on time generator 42.

The frequency phase detector 4 receives the reference clock signal CLKref and the switch control signal GD, and compares a cycle time difference between the switch control signal GD and the reference clock signal CLKref to generate a frequency tracking voltage V _FTC related to the cycle time difference. When the cycle time of the switch control signal GD is less than the cycle time of the reference clock signal CLKref, the value of the frequency tracking voltage V _FTC is decreased. In this embodiment, the cycle time difference is a phase difference related to the rising edge of the switch control signal GD and the reference clock signal CLKref, but is not limited thereto. Another method is to compare the switch control signal GD with the reference clock signal. The phase difference of the falling edge of CLKref.

Timing generator 42 is electrically connected to the phase frequency detector 41 receives the voltage V _FTC frequency tracking, and the tracking voltage V _FTC generating the terminating trigger Reset According to this frequency, the termination trigger is generated each time interval on the inverted Reset The frequency tracks the value of the voltage V _FTC , and as the value of the frequency tracking voltage V _FTC decreases, the interval increases. The on-time generator 42 includes a voltage-to-current circuit A2, a capacitor C1, a first comparator A1, and a switch S2.

The voltage-to-current circuit A2 is electrically connected to the frequency phase detector 41 to receive the frequency tracking voltage V _FTC and convert the frequency tracking voltage V _FTC into a frequency tracking current I _FTC . I _FTC = gm × V _FTC , where the parameter gm is a transconductance value of the voltage-to-current circuit A2.

The capacitor C1 is electrically connected to the voltage-to-current circuit A2 to receive the frequency tracking current I _FTC , and the charging generates a sawtooth voltage Vsaw.

The first comparator A1 has a non-inverting input terminal (+) electrically connected to the capacitor C1 to receive the sawtooth voltage Vsaw and an inverting input terminal (-) receiving a threshold voltage V _D when the sawtooth voltage Vsaw is greater than When the threshold voltage V _D is reached, the termination trigger Reset is generated. From the capacitor C1 and the frequency tracking current I _FTC , T _ON = (C1 × V _D ) / I _FTC can be derived.

The switch S2 is connected in parallel to the capacitor C1 and is controlled by an inverting switch Controlling switching between conduction and non-conduction, when the switch S2 is turned on, discharging the sawtooth voltage Vsaw of the capacitor C1, the reverse switching control signal The phase is opposite to the phase of the switch control signal GD.

As shown in FIG. 4, in the embodiment, the timing diagram of the load from the light load to the heavy load period is operated. In order to gradually decrease the frequency of the switch control signal GD close to the reference clock signal, the frequency phase detector 41 gradually decreases. The frequency is tracked by the voltage V _FTC , and the frequency tracking current I _FTC is also gradually decreased, so that the charging time of the capacitor C1 is gradually increased, and the time for the sawtooth voltage Vsaw to rise to the threshold voltage V _D is gradually increased each time, and each time the termination trigger Reset is generated. The interval time is gradually increased, and the time difference between the generation time point of the start trigger set and the reception time point of the termination trigger reset is gradually increased, so that the on-time T _{ON of} the switch control signal GD is gradually increased, and finally the switch control signal is caused. GD is the same frequency as the reference clock signal CLKref. When the present embodiment operates during a transient period in which the load is switched from a light load to a heavy load, or from a heavy load to a light load, the corresponding timing is as shown in FIG. 5 and FIG. 6, respectively. During the transient period when the heavy load is rushed to light load, the output voltage Vo rises rapidly, which is much larger than the preset output value (that is, the overshoot voltage in FIG. 6), and the second comparator 32 does not output the start trigger Set. The output terminal Q of the SR latch 33 does not output the switch control signal GD. During this period, the driver 34 does not have any pulse output to the power output stage 2 (that is, the pulse in FIG. 6 is omitted), and the output voltage Vo will gradually decrease. . When the output voltage Vo drops again to less than the preset output value, the second comparator 32 outputs a start trigger set, and the output terminal Q of the SR latch 33 outputs the switch control signal GD. Since the load is in a light load state and there is still a slight current output demand, the frequency tracking voltage V _FTC will gradually decrease, and the on-time T _{ON of the} switch control signal GD is gradually increased to provide the load under light load conditions. Current demand.

<Second embodiment>

Referring to FIG. 7, a second embodiment of the chopper adjusting device with frequency tracking function of the present invention differs from the first embodiment in that the second embodiment adjusts the off time _TOFF to change the switch on signal GD. The cycle time, that is, the manner in which the chopper control stage 3 generates the switch turn-on signal GD is also different. The termination trigger Reset is also generated by the shutdown time generator 47 in the frequency tracking stage.

The chopper control stage 3 receives a termination trigger Reset, and electrically connects the power output stage 2 to determine whether the value of the output voltage Vo is greater than a preset output value to determine when to generate a start trigger Set, and trigger the Set according to the start The termination trigger Reset generates the switch control signal GD, wherein an off time T _{OFF of} the switch control signal GD is related to a time difference between a generation time point of the start trigger set and a reception time point of the termination trigger Reset.

As further described below, the chopping control stage 3 includes a detector 31, a second comparator 32, an SR latch 33, and a driver 34.

The detector 31 detects the output voltage Vo to generate a detection voltage proportional to the output voltage Vo. The detector 31 has a first resistor Rf1 and a second resistor Rf2 connected in series.

The second comparator 32 has a non-inverting input terminal (+) electrically connected to the detector 31 for receiving the detection voltage, and an inverting input terminal for receiving a reference voltage Vref proportional to the preset output value. (-), when the detection voltage is greater than the reference voltage Vref, the start trigger Set is generated. Wherein, the reference voltage Vref and the preset output The ratio of the values is equivalent to the ratio of the detected voltage to the output voltage Vo, which is related to the ratio of the first and second resistors Rf1, Rf2.

The SR latch 33 has a set terminal S electrically connected to the second comparator 32 to receive the start trigger set, a reset terminal R electrically connected to the first comparator A1 to receive the termination trigger Reset, and an output. Inverting output of switch control signal GD And an output-inverting switch control signal Output Q.

The driver 34 is electrically connected to the inverting output terminal Q of the SR latch 33 to receive the switch control signal GD, and amplifies the level of the switch control signal GD to enhance the driving capability, and then outputs the power to the power output stage 2.

As shown in FIG. 8, a method for tracking frequency is performed for the second embodiment. When the cycle time of the switch control signal GD and the reference clock signal CLKref are the same, it means that the load remains unchanged, if the two cycle time is not When they are the same, it means that the load changes. The following will be discussed in two situations:

During the period from the heavy load to the light load, the frequency tracking stage 4 detects the cycle time Tsw of the switch control signal GD < the cycle time Tref of the reference clock signal CLKref, and reduces the frequency tracking voltage V _FTC ↓, and increases the switch control. The off time T _OFF信号 of the signal GD is increased, and the cycle time Tsw=T _ON +T _{OFF of the} switch control signal GD is increased.

When the load is changed from light load to heavy load, since the frequency tracking stage 4 detects the cycle time Tsw of the switch control signal GD> the cycle time Tref of the reference clock signal CLKref, the frequency tracking voltage V _FTC增加 is increased, and the switch control is lowered. The off time T _OFF信号 of the signal GD is decreased, and the cycle time Tsw=T _ON +T _{OFF of the} switch control signal GD is lowered.

As shown in FIG. 9 , in the embodiment, the timing diagram of the load during the period from the heavy load to the light load is performed. In order to gradually decrease the frequency of the switch control signal GD close to the reference clock signal CLKref, the frequency phase detector 41 gradually becomes The frequency tracking voltage V _FTC is lowered, and the frequency tracking current I _FTC is also gradually decreased, so that the charging time of the capacitor C1 is gradually increased, and the time for the sawtooth voltage Vsaw to rise to the threshold voltage V _D is gradually increased each time, and a termination trigger is generated each time. interval gradually increases, so that the start trigger generation time Set with the terminating the trigger point of the Reset reception timing difference gradually increases, so that the switching control signal GD off time T _oFF gradually increased, and finally the switch control The signal GD is the same as the frequency of the reference clock signal CLKref.

<Third embodiment>

Referring to FIG. 10, a third embodiment of the chopper adjusting device with frequency tracking function of the present invention differs from the first embodiment in that the on-time generator 42 includes a voltage-to-current circuit A2, a capacitor C1, and a window. Voltage range comparator A3, and a switch S2.

The voltage-to-current circuit A2 is electrically connected to the frequency phase detector 41 to receive the frequency tracking voltage V _FTC and convert the frequency tracking voltage V _FTC into a current I _FTC .

The capacitor C1 is electrically connected to the voltage-to-current circuit A2 to receive the current I _FTC , and the charging generates a sawtooth voltage Vsaw.

The window voltage range comparator A3 is electrically connected to the capacitor C1 to receive the sawtooth voltage, and compares the sawtooth voltage Vsaw with a window voltage range defined between a high level voltage VH and a low level voltage VL. When the sawtooth voltage Vsaw is greater than the high level voltage VH, the termination trigger Reset is generated. When the sawtooth voltage Vsaw is less than the low high level voltage VL, the termination trigger Reset is pulled down. The window voltage range comparator A3 includes a voltage divider 43, a high level comparator 44, a low level comparator 45, and an SR latch 46.

The voltage divider 43 receives a power supply voltage VDD and divides the power supply voltage VDD into the high level voltage VH and the low level voltage VL. The high level comparator 44 has an inverting input terminal (-) receiving the high level voltage VH and a non-inverting input terminal (+) electrically connected to the capacitor C1 to receive the sawtooth voltage Vsaw, when the sawtooth voltage When Vsaw is greater than the high level voltage VH, a reset trigger is generated. The low level comparator 45 has a non-inverting input terminal (+) receiving the low level voltage VL and an inverting input terminal (-) electrically connected to the capacitor C1 to receive the sawtooth voltage Vsaw, when the sawtooth voltage When Vsaw is less than the low level voltage VL, a set trigger is generated. The SR latch 46 has a reset terminal R electrically connected to the high level comparator 44 to receive the reset trigger, and a set terminal S and an output electrically connected to the low level comparator 45 to receive the set trigger. The termination triggers the output terminal Q of the Reset, and an inverted output terminal that outputs the reverse termination trigger .

The switch S2 is connected in parallel to the capacitor C1, and is controlled by a reverse termination trigger to switch between conduction and non-conduction. When the switch S2 is turned on, the sawtooth voltage Vsaw of the capacitor C1 is discharged.

<Fourth embodiment>

Referring to FIG. 11, a fourth embodiment of the chopper adjusting device with frequency tracking function of the present invention differs from the first embodiment in that the cycle time of the switch control signal GD is determined by a digital counting method; the specific technical difference is that The on-time generator 42 includes an analog to digital converter 5 and a counter 6.

The analog to digital converter 5 is electrically coupled to the frequency phase detector 41 to receive the frequency tracking voltage V _FTC , convert the frequency tracking voltage V _FTC to a logic value, and invert the logic value to generate a digital code. The counter 6 is electrically coupled to the analog to digital converter 5 to receive the digital code, and the termination trigger Reset is generated each time the digital code is counted.

As shown in FIG. 12, in the embodiment, the timing diagram of the load during the period from the light load to the heavy load is performed. In order to gradually decrease the frequency of the switch control signal GD close to the reference clock signal CLKref, the frequency phase detector 41 gradually becomes The frequency tracking voltage V _FTC is decreased, and the logic value is gradually decreased, and the digit code inverted to the logic value is gradually increased, so that the counter 5 needs to gradually increase the counting time each time, so that the interval between the termination of the trigger is generated each time. Increasingly, the time difference between the generation time point of the start trigger set and the reception time point of the termination trigger reset is gradually increased, so that the on-time T _{ON of} the switch control signal GD is gradually increased, and finally the switch control signal GD is The frequency of the reference clock signal CLKref is the same. Among them, the parameter CNT[3:0] is defined as a four-digit digit code, the parameter T _{ON, 1} ~ T _{ON, 16} indicates the on-time corresponding to different digit code, CNT[3:0]=0000, 0001, 0010. ..1110, 1111, respectively, represent T _{ON, 1} , T _{ON, 2} , T _{ON, 3} ... T _{ON, 15} , T _{ON, 16} . In FIG. 12, the layout is limited to the convenience of explanation, and the remaining digit codes between 0010 and 1110 are omitted.

<Fifth Embodiment>

Referring to FIG. 13, a fifth embodiment of the chopper adjusting device with frequency tracking function of the present invention differs from the first embodiment in that the frequency tracking stage 4 includes a frequency phase detector 41 and a frequency tracking counter 7.

The frequency phase detector 41 receives the reference clock signal CLKref and the switch control signal GD, and compares a cycle time difference between the switch control signal GD and the reference clock signal CLKref to generate an up signal UP or a down signal DOWN. When the cycle time of the switch control signal GD is greater than the cycle time of the reference clock signal CLKref, the upper signal UP is generated. When the cycle time of the switch control signal GD is less than the cycle time of the reference clock signal CLKref, the The lower number signal is DOWN.

The frequency counter 71 is electrically connected to the frequency phase detector 41 to receive the up signal UP or the down signal DOWN, and to increase or decrease a target count value. When the target count value is counted, the termination trigger Reset is generated. When receiving the down signal DOWN, the target count value is increased. When the up signal UP is received, the target count value is decreased. When the up signal UP and the down signal DOWN are not received, Then the target count value is maintained unchanged. When the load is changed from light load to heavy load, the operation timing chart of this embodiment is as shown in FIG.

The third embodiment, the fourth embodiment, and the fifth embodiment of the present invention are both for adjusting the on-time T _ON to change the cycle time of the switch-on signal GD to achieve the purpose of tracking the frequency of the reference clock signal CLKref. The above-described three embodiments of the second embodiment mutatis mutandis also spirit, to adjust the off time T _OFF switch is turned to change the cycle time of the signal GD to achieve the purpose of tracking the frequency of the reference clock signal CLKref, but are not repeated here.

In summary, the above embodiment has the following advantages:

1. When the load becomes light load or heavy load, the frequency tracking stage 4 will track the frequency of the switch control signal GD to lock into the frequency like the reference clock signal CLKref, and achieve a fixed frequency to improve the electromagnetic interference effect, and is also easy to design. A technique for filtering electromagnetic interference.

2. Compared with the existing frequency control technology, the frequency phase detector 41 replaces the frequency-to-current (or voltage) circuit and the integrating amplifier, which can save the wafer area and speed up the frequency response, so the invention can be achieved. The purpose.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

2‧‧‧Power output stage

Vo‧‧‧ output voltage

Io‧‧‧ output current

Vin‧‧‧Input voltage

3‧‧‧Chopper control level

4‧‧‧frequency tracking level

Claims (12)

A chopper adjusting device with frequency tracking function includes: a power output stage receiving an input voltage and a switch control signal and generating an output voltage, and converting the input voltage into the output voltage according to the switch control signal; The chopper control stage receives a termination trigger and electrically connects the power output stage to determine whether the value of the output voltage is less than a preset output value to determine when a start trigger is generated, and generates the start trigger and the termination trigger according to the start trigger a switch control signal, wherein an on-time of the switch control signal is related to a time difference between a start time point of the start trigger and a receive time point of the end trigger; and a frequency tracking stage receiving a reference clock signal and electrically connecting the The chopper control stage determines whether a cycle time of the switch control signal is equal to a cycle time of the reference clock signal to determine when the termination trigger is generated, and causes the chopper control stage to increase or decrease the switch control according to the termination trigger The cycle time of the signal is close to the cycle time of the reference clock signal, which is Increase or decrease the cycle time of the control signal to follow the increase or decrease its on-time. The chopper adjusting device of claim 1, wherein the power output stage further generates an output current to a load, and when the amount of change of the load is gradually changed from a light load to a heavy load, the output current follows the load. The amount of change gradually increases, and the time difference between the generation time point of the start trigger and the reception time point of the termination trigger gradually increases, so that the conduction time of the switch control signal gradually increases, and the cycle time of the switch control signal gradually increases. The chopper adjusting device of claim 1, wherein the frequency tracking stage comprises: a frequency phase detector, receiving the reference clock signal and the switch control signal, and comparing the switch control signal with the reference clock signal a cycle time difference to generate a frequency tracking voltage associated with the cycle time difference; and a conduction time generator electrically coupled to the frequency phase detector to receive the frequency tracking voltage, and generating the termination trigger according to the frequency tracking voltage, each The interval at which the termination trigger is generated in turn reverses the value of the frequency tracking voltage, and as the value of the frequency tracking voltage decreases, the interval increases. The chopper adjusting device of claim 3, wherein the cycle time difference is a phase difference related to a rising edge of the switch control signal and the reference clock signal. The chopper adjusting device of claim 3, wherein the on-time generator comprises: a voltage-to-current circuit electrically connected to the frequency phase detector to receive the frequency tracking voltage, and converting the frequency tracking voltage into a a current, a capacitor electrically connected to the voltage to current circuit to receive the current, and charging to generate a sawtooth voltage; a first comparator having a non-inverting input electrically connected to the capacitor to receive the sawtooth voltage and receiving An inverting input terminal of a threshold voltage, the termination trigger is generated when the sawtooth voltage is greater than the threshold voltage; and a switch is connected in parallel to the capacitor and controlled by an inverting switch control signal to switch between conduction and non-conduction When the switch is turned on, the saw of the capacitor The tooth voltage is discharged, and the phase of the inverting switch control signal is opposite to the phase of the switch control signal. The chopper adjusting device of claim 3, wherein the on-time generator comprises: a voltage-to-current circuit electrically connected to the frequency phase detector to receive the frequency tracking voltage, and converting the frequency tracking voltage into a a current, a capacitor electrically connected to the voltage-to-current circuit to receive the current, and charging to generate a sawtooth voltage; a window voltage range comparator electrically connecting the capacitor to receive the sawtooth voltage and comparing the sawtooth voltage to a window voltage Range, the window voltage range is between a high level voltage and a low level voltage. When the sawtooth voltage is greater than the high level voltage, the termination trigger is generated when the sawtooth voltage is lower than the low high level voltage. Pulling the termination trigger; and a switch connected in parallel to the capacitor, and being controlled by a reverse termination trigger to switch between conduction and non-conduction. When the switch is turned on, the sawtooth voltage of the capacitor is discharged. The chopper adjustment device of claim 6, wherein the window voltage range comparator comprises: a voltage divider that receives a power supply voltage and divides the power supply voltage into the high level voltage and the low level a high-level comparator having an inverting input receiving the high-level voltage and a non-inverting input electrically connected to the capacitor to receive the saw-tooth voltage, when the saw-tooth voltage is greater than the high-level voltage Then, a reset trigger is generated; a low level comparator having a non-inverting input receiving the low level voltage and an inverting input terminal electrically connecting the capacitor to receive the sawtooth voltage, when the sawtooth voltage is less than the low level voltage, Generating a setting trigger; and an SR latch having a reset terminal electrically connected to the high level comparator to receive the reset trigger, and a low connection to the low level comparator to receive the setting trigger setting The terminal outputs an output terminal that terminates the trigger, and an output terminal that outputs the reverse termination trigger. The chopper adjusting device of claim 3, wherein the on-time generator comprises: an analog-to-digital converter electrically connected to the frequency phase detector to receive the frequency tracking voltage and convert the frequency tracking voltage Forming a logic value, inverting the logic value to generate a digital code; and a counter electrically connecting the analog to the digital converter to receive the digital code, and generating the termination trigger each time the digital code is counted. The chopper adjusting device of claim 1, wherein the frequency tracking stage comprises: a frequency phase detector, receiving the reference clock signal and the switch control signal, and comparing the switch control signal with the reference a cycle time difference of the clock signal to generate an upper signal or a lower signal. When the cycle time of the switch control signal is greater than the cycle time of the reference clock signal, the upper signal is generated, when the cycle time of the switch control signal When the cycle time is less than the cycle time of the reference clock signal, the down signal is generated; and a frequency tracking counter is electrically connected to the frequency phase detector to receive the up signal or the down signal, and according to the target Count value when counting to The termination trigger is generated when the target count value is received, and when the lower number signal is received, the target count value is increased, and when the upper signal is received, the target count value is decreased, when the upper count signal is not received and the lower When the signal is counted, the target count value is maintained. The chopper adjustment device of claim 1, wherein the chopping control stage comprises: a detector that detects the output voltage to generate a detection voltage proportional to the output voltage; a second comparator, Having an inverting input terminal electrically connected to the detector to receive the detection voltage, and a non-inverting input terminal receiving a reference voltage proportional to the preset output value, when the detection voltage is less than the reference voltage The start trigger is generated; an SR latch has a set end electrically connected to the second comparator to receive the start trigger, and a reset end electrically connected to the first comparator to receive the termination trigger, An output terminal for outputting the switch control signal and an inverted output terminal for outputting the control signal of the reverse switch; and a driver electrically connected to the output end of the SR latch to receive the switch control signal and control the switch The level of the signal is amplified to enhance the driving capability and then output to the power output stage. A chopper adjusting device with frequency tracking function includes: a power output stage receiving an input voltage and a switch control signal and generating an output voltage, and converting the input voltage into the output voltage according to the switch control signal; The chopper control stage receives a termination trigger and electrically connects the power output stage to determine whether the value of the output voltage is greater than a preset output value to determine when to generate a start touch And generating, according to the start trigger and the termination trigger, the switch control signal, wherein a turn-off time of the switch control signal is related to a time difference between a start time point of the start trigger and a receive time point of the end trigger; and a frequency a tracking stage, receiving a reference clock signal, and electrically connecting the chopping control stage to determine whether a cycle time of the switch control signal is equal to a cycle time of the reference clock signal to determine when the termination trigger is generated, and the chopping control is performed The stage increases or decreases the cycle time of the switch control signal according to the termination trigger to approach the cycle time of the reference clock signal. The chopper adjustment device of claim 11, wherein the chopping control stage comprises: a detector that detects the output voltage to generate a detection voltage proportional to the output voltage; a second comparator, Having a non-inverting input terminal electrically connected to the detector to receive the detection voltage, and an inverting input terminal receiving a reference voltage proportional to the preset output value, when the detection voltage is greater than the reference voltage The start trigger is generated; an SR latch has a set end electrically connected to the second comparator to receive the start trigger, and a reset end electrically connected to the first comparator to receive the termination trigger, An output of the inverting output of the switch control signal and an output of an inverting switch control signal; and a driver electrically connected to the inverting output of the SR latch to receive the switch control signal and The level control of the switch control signal is amplified to enhance the driving capability and then output to the power output stage.