CN115333370A

CN115333370A - Voltage regulation and control circuit and electronic device

Info

Publication number: CN115333370A
Application number: CN202211255104.8A
Authority: CN
Inventors: 甘戈; 梅文甲
Original assignee: Yutai Semiconductor Co ltd
Current assignee: Yutai Semiconductor Co ltd
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2022-11-11
Anticipated expiration: 2042-10-13
Also published as: CN115333370B

Abstract

A voltage regulation and control circuit and an electronic device are provided, wherein the voltage regulation and control circuit comprises a control module, an output module, a current detection module, a voltage detection module and a feedback detection module. The control module adjusts the voltage of the power supply module and then provides the adjusted voltage to the load through the output module. The current detection module samples the current of the output module to obtain a sampling current and outputs a current detection signal. The voltage detection module samples the voltage of the output module to obtain a sampling voltage and outputs a voltage detection signal. When the current detection signal is at a first level, the feedback detection module reduces the duty ratio of the feedback signal, and the control module adjusts the input current provided by the power supply module to a preset current according to the adjusted feedback signal so as to stabilize the input current; when the current detection signal is at the second level, the feedback detection module adjusts the duty ratio of the feedback signal according to the voltage detection signal, and the control module adjusts the output voltage of the output module to a preset voltage according to the adjusted feedback signal so as to stabilize the output voltage.

Description

Voltage regulation and control circuit and electronic device

Technical Field

The present invention relates to the field of power supply conversion technologies, and in particular, to a DC/DC voltage regulation and control circuit and an electronic device.

Background

The DC/DC converter performs DC voltage conversion and supplies the converted voltage to a load. A voltage stabilizing circuit is generally provided in the DC/DC converter. The voltage stabilization circuit includes at least one feedback resistor and an error amplifier. The error amplifier compares the output voltage fed back by the feedback resistor with a required reference voltage value, and controls the voltage of the control terminal of the output transistor so that the two voltages approach each other. Thus, when the input voltage or the load varies, the voltage stabilization circuit changes the duty ratio of the control signal at the control terminal of the output transistor in accordance with the variation. In order to stably operate the load, it is sometimes necessary to control the input current of the DC/DC converter to be stable at a constant value.

Disclosure of Invention

The invention mainly aims to provide a voltage regulation and control circuit and an electronic device, and aims to solve the problem that the output voltage and the input current cannot be stabilized simultaneously in the prior art.

A voltage regulation and control circuit receives voltage provided by a power supply module and provides stable voltage and current for a load; the voltage regulation circuit includes:

the control module is used for adjusting the voltage provided by the power supply module and controlling the output of the voltage;

the output module is electrically connected with the control module and used for providing the regulated voltage to the load;

the current detection module is electrically connected with the output module and used for sampling the current of the output module to obtain a sampling current, identifying whether the input current provided by the power supply module exceeds a preset current or not according to the sampling current and outputting a current detection signal;

the voltage detection module is electrically connected with the output module and used for sampling the voltage of the output module to obtain a sampling voltage and outputting a voltage detection signal according to the sampling voltage;

the feedback detection module is electrically connected with the current detection module, the voltage detection module and the control module and is used for outputting a feedback signal to the control module according to the current detection signal or the voltage detection signal;

when the current detection signal is at a first level, recognizing that the input current provided by the power module is greater than the preset current, reducing the duty ratio of the feedback signal according to the current detection signal by the feedback detection module, and adjusting the input current provided by the power module to the preset current by the control module according to the adjusted feedback signal so as to stabilize the input current provided by the power module; when the current detection signal is at a second level, the feedback detection module adjusts the duty ratio of the feedback signal according to the voltage detection signal, and the control module adjusts the output voltage of the output module to a preset voltage according to the adjusted feedback signal so as to stabilize the output voltage of the output module.

In addition, in order to achieve the above object, the present invention further provides an electronic device for providing a stable voltage and current to a load; the electronic device comprises a power supply module and a voltage regulation and control circuit; the voltage regulation and control circuit is used for regulating the voltage provided by the power supply module; the voltage regulation circuit includes:

the output module is electrically connected with the control module and used for providing the adjusted voltage for the load;

when the current detection signal is at a first level, recognizing that the input current provided by the power module is greater than the preset current, reducing the duty ratio of the feedback signal according to the current detection signal by the feedback detection module, and adjusting the input current provided by the power module to the preset current by the control module according to the adjusted feedback signal; when the current detection signal is at a second level, the feedback detection module adjusts the duty ratio of the feedback signal according to the voltage detection signal, and the control module adjusts the output voltage of the output module to a preset voltage according to the adjusted feedback signal so as to stabilize the output voltage of the output module.

Above-mentioned voltage regulation and control circuit and electron device are right simultaneously through setting up current detection module and voltage detection module output module's output voltage and output current detect, when the input current that power module provided is greater than predetermineeing the electric current, adjust through feedback detection module and control module and stabilize the input current that power module provided is to predetermineeing the electric current, has improved electron device's stability avoids electron device damage the load.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a block diagram of an electronic device according to a preferred embodiment of the invention.

Fig. 2 is a circuit diagram of the electronic device in fig. 1.

Fig. 3 is a schematic diagram of waveforms of the first switching signal, the second switching signal, the first control signal, the second control signal, the current sensing signal, and the current on the inductor in fig. 2.

Description of the main elements

Electronic device 100

Load 200

Voltage regulation circuit 300

Power supply module 101

Control module 102

Output module 103

Current detection module 104

Voltage detection module 105

Feedback detection module 106

PWM control unit 1021

Switch unit 1023

Supply terminal VIN

First capacitor C1

Inductor L

First transistor Q1

Second transistor Q2

Third transistor Q3

Second capacitance C2

Third capacitor C3

Sampling comparator 1041

Constant current unit 1043

Current detection unit 1045

Setting a resistance RSET

Constant current source I _set

First switch SW1

Second switch SW2

Conversion capacitor C4

First resistor R1

Second resistor R2

Error amplifier 1051

Comparator 1061

First diode D1

Second diode D2

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terms "first", "second", and "third", etc. in the description of the present invention and the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprises" and any variations thereof, are intended to cover non-exclusive inclusions.

The following describes specific embodiments of the voltage regulation circuit and the electronic device according to the present invention with reference to the drawings.

Please refer to fig. 1, which is a block diagram of an electronic device 100. The electronic device 100 is used for providing a stable voltage and current to the load 200. In at least one embodiment of the present invention, the load 200 can be accommodated in the electronic device 100 and electrically connected to the electronic device 100. In at least one embodiment of the present invention, the electronic device 100 may be a charging bin or a charging box; the load 200 may be, but is not limited to, a headset, a mobile phone, a wearable electronic device, a notebook computer, a tablet computer, and a Personal Digital Assistant (PDA).

The electronic device 100 includes a power module 101, a control module 102, an output module 103, a current detection module 104, a voltage detection module 105, and a feedback detection module 106. The control module 102, the output module 103, the current detection module 104, the voltage detection module 105, and the feedback detection module 106 form a voltage regulation circuit 300. The voltage regulation circuit 300 detects the output current and the output voltage of the output module 103 through the current detection module 104 and the voltage detection module 105, respectively, stabilizes the input current provided by the power module 101 at a preset current through the feedback detection module 106 and the control module 102 when the input current provided by the power module 101 is abnormal, and stabilizes the output voltage of the output module 103 at a preset voltage through the feedback detection module 106 and the control module 102 when the output voltage of the output module is abnormal.

Fig. 2 is a circuit diagram of the electronic device 100. The power module 101 is electrically connected to the control module 102 and the output module 103. The power module 101 is configured to provide the voltage to the load 200 through the output module 103 under the control of the control module 102. The power module 101 includes a power supply terminal VIN, an inductor L, and a first capacitor C1. The power supply terminal VIN is used for providing the voltage. One end of the first capacitor C1 is electrically connected to the power supply terminal VIN, and the other end is grounded. The first capacitor C1 is configured to filter the charging voltage provided by the supply terminal VIN. The inductor L is configured to store the voltage provided by the power supply terminal VIN and provide the voltage to the output module 103.

Referring to fig. 1 and fig. 2, the control module 102 is electrically connected between the power module 101 and the output module 103, and is electrically connected to the feedback detection module 106. The control module 102 is configured to output the input current and the input voltage provided by the power module 101 to the load 200 through the output module 103, and adjust the input current provided by the power module 101 or the output voltage current of the output module 103 according to a feedback signal of the feedback detection module 106. The control module 102 includes a PWM control unit 1021 and a switching unit 1023. The PWM control unit 1021 is electrically connected between the feedback detection module 106 and the switch unit 1023. The PWM control unit 1021 outputs a first control signal HSon and a second control signal LSon to the switch unit 1023, and adjusts the duty ratio of the first control signal HSon and the second control signal LSon according to the feedback signal provided by the feedback detection module 106. The switch unit 1023 is electrically connected to the PWM control unit 1021, the power module 101, and the output module 103. The switch unit 1023 is used for providing the input current and the input voltage of the power module 101 to the output module 103 in a first phase and controlling the power module 101 to discharge in a second phase. The switching unit 1023 includes a first transistor Q1 and a second transistor Q2. The first transistor Q1 is used to establish or cut off the electrical connection between the power module 101 and the output module 103. The control end of the first transistor Q1 receives the first control signal HSon, the first connection end of the first transistor Q1 is electrically connected to the inductor L, and the second connection end of the first transistor Q1 is electrically connected to the output module 103. The second transistor Q2 is used to establish or cut off a discharge path of the power module 101. The control end of the second transistor Q2 receives the second control signal LSon, the first connection end of the second transistor Q2 is grounded, and the second connection end of the second transistor Q2 is electrically connected to the inductor L. In at least one embodiment of the present invention, the first Transistor Q1 and the second Transistor Q2 are Metal-Oxide Semiconductor Field Effect transistors (MOSFETs), the control terminal is a gate, the first connection terminal is a source, and the second connection terminal is a drain.

Referring to fig. 1 and fig. 2, the output module 103 is electrically connected to the control module 102 and the load 200. The output module 103 is configured to provide an output voltage to the load 200. The output module 103 includes a third transistor Q3, a second capacitor C2, and a third capacitor C3. The third transistor Q3 is used to establish or break an electrical connection between the control module 102 and the load 200. The control end of the third transistor Q3 receives a control signal ON, the first connection end of the third transistor Q3 is electrically connected to the second connection end of the first transistor Q1, and the second connection end of the third transistor Q3 is electrically connected to the load 200 through an output end VOUT. The second capacitor C2 is used for filtering the voltage input by the control module 102. One end of the second capacitor C2 is electrically connected to the first connection end of the third transistor Q3, and the other end is grounded. The third capacitor C3 is used for filtering the voltage of the output terminal VOUT. One end of the third capacitor C3 is electrically connected to the output terminal VOUT, and the other end of the third capacitor C3 is grounded. In at least one embodiment of the present invention, the third transistor Q3 is an N-type MOSFET, the control terminal is a gate, the first connection terminal is a source, and the second connection terminal is a drain.

Referring to fig. 1 and fig. 2, the current detection module 104 is electrically connected to the output module 103 and the feedback detection module 106. The current detection module 104 repeatedly operates at a current detection period T. The current detection module 104 is configured to sample a current of the output module 103 to obtain a sampled current I _{out_sens} And according to the sampling current I _{out_sens} The difference voltage Vdiff obtained by the conversion with the constant current is used as a current detection signal to be sent to the feedback detection module 106. The current detection signal is used to identify a relationship between the input current provided by the power module 101 and the preset current. When the current detection signal is at a first level, recognizing that the input current provided by the power module 101 is greater than the preset current; and when the current detection signal is at a second level, recognizing that the input current provided by the power module 101 is smaller than the preset current. The current detection module 104 includes a sampling comparator 1041, a constant current unit 1043, and a current detection unit 1045. The sampling comparator 1041 is configured to sample a current of the output module 103 to obtain a sampling current I _{out_sens} . A positive input end of the sampling comparator 1041 is electrically connected to the first connection end of the third transistor Q3, a negative input end of the sampling comparator 1041 is electrically connected to the second connection end of the third transistor Q3, and an output end of the sampling comparator 1041 is electrically connected to the current detection unit 1045. The sampling current I _{out_sens} Proportional to the output current of the output module 103, and calculated by formula one.

Formula one

Wherein, I _out Is the output current, I, of the output module 103 _{out_sens} For the sampling current, K _sens Are sampling coefficients.

Referring to fig. 1 and fig. 2, the constant current unit 1043 is used for outputting the constant current to the current detecting unit 1045. Wherein the constant current is equal to the preset current. The constant current unit 1043 comprises a setting resistor RSET and a constant current source I _set . The setting resistor RSET is an adjustable resistor, and the constant current source I can be adjusted by adjusting the resistance value of the setting resistor RSET _set And outputting the constant current. One end of the setting resistor RSET and the constant current source I _set And the output end VOUT is electrically connected, and the other end of the setting resistor RSET is grounded. The constant current source I _set And the output end of the current detection unit 1045 is electrically connected to the current detection unit.

Referring to fig. 1 and fig. 2, the current detecting unit 1045 is electrically connected to the sampling comparator 1041 and the constant current unit 1043. The current detection unit 1045 is configured to repeatedly operate in the current detection period T. The current detection unit 1045 receives the sampling current I _{out_sens} And the constant current generates the difference voltage as the current detection signal Vdiff to the feedback detection module 106. The current detection unit 1045 includes a first switch SW1, a second switch SW2, and a conversion capacitor C4. The first switch SW1 is used for controlling the conversion capacitor C4 to conduct according to the sampling current I when being conducted _{out_sens} A discharging operation is performed. One end of the first switch SW1 is electrically connected to the output end of the sampling comparator 1041, and the other end of the first switch SW1 is electrically connected to the first end of the converting capacitor C4. The first switch SW1 is controlled by a first switch signal S1. The second switch SW2 is used for controlling the conversion capacitor C4 to perform a charging operation according to the constant current when being turned on. One end of the second switch SW2 and the constant current source I _set And the other end of the second switch SW2 is electrically connected with the first end of the conversion capacitor C4. The second switch SW2 is controlled by a second switch signal S2. The transfer capacitor C4 is configured to sequentially perform the charging operation and the discharging operation in the current detection period T and provide the difference voltage between the charging operation and the discharging operation as the current detection signal Vdiff to the feedback detection module 106. A first end of the converting capacitor C4 is electrically connected between the first switch SW1 and the second switch SW2, and a second end of the converting capacitor C4 is grounded. In at least one embodiment of the present invention, the first switching signal S1 is a constant voltage VD, and the first switching signal S1 is active high; the second switching signal S2 is a periodic square wave signal. Wherein, the period of the second switching signal S2 is T; the period T of the second switching signal S2 comprises an inactive phase T _off In the inactive phase T _off The second switching signal S2 is at a high level. The second switching signal S2 and the second control signal LSon have the same period and opposite phases. In the invalid phase T _off The second switch SW2 is turned on, and the conversion capacitor C4 is controlled by the constant current source I _set The second switch SW2 is turned off in other phases, and the transfer capacitor C4 is operated according to the sampled current I _{out_sens} The discharging operation is performed. When the amount of electricity stored in the transfer capacitor C4 during the charging operation is greater than the amount of electricity stored in the transfer capacitor C4 during the discharging operation, the difference voltage of the transfer capacitor C4 is a positive value, that is, the current detection signal Vdiff is at the second level. When the amount of electricity stored in the transfer capacitor C4 during the charging operation is smaller than the amount of electricity stored in the transfer capacitor C4 during the discharging operation, the difference voltage of the transfer capacitor C4 is a negative value, that is, the current detection signal Vdiff is at the first level. In at least one embodiment of the present invention, the first level is a low level; the second level is a high level.

Referring to fig. 1 and fig. 2, the voltage detection module 105 is electrically connected to the output module 103 and the feedback detection module 106. The voltage detection module 105 is configured to sample an output voltage of the output terminal VOUT to obtain a sampled voltage. The voltage detection module 105 is further configured to compare the sampled voltage with a reference voltage, and output a voltage detection signal to the feedback detection module 106 according to a comparison result. Wherein the electric voltage detection signal is used for identifying the relationship between the output voltage of the output module 103 and the preset voltage. When the voltage detection signal is at the second level, recognizing that the output voltage of the output module 103 is smaller than the preset voltage; when the voltage detection signal is at the first level, it is recognized that the output voltage of the output module 103 is greater than the preset voltage. The voltage detection module 105 includes a first resistor R1, a second resistor R2, and an error amplifier 1051. The first resistor R1 and the second resistor R2 are connected in series between the output terminal VOUT and ground. The inverting input terminal of the error amplifier 1051 is electrically connected between the first resistor R1 and the second resistor R2, the forward input terminal of the error amplifier 1051 receives the reference voltage VREF, and the output terminal of the error amplifier 1051 is electrically connected to the feedback detection module 106. When the sampling voltage is less than the reference voltage VREF, the error amplifier outputs the voltage detection signal in the second level state. The error amplifier 1051 outputs the voltage detection signal in the first level state when the sampling voltage is greater than the reference voltage VREF.

Referring to fig. 1 and 2, the feedback detection module 106 is electrically connected to the current detection module 104, the voltage detection module 105 and the control module 102. The feedback detection module 106 is configured to adjust and output a feedback signal to the control module 102 according to the current detection signal or the voltage detection signal. When the current detection signal is at the second level, the feedback detection module 106 reduces the duty ratio of the feedback signal according to the current detection signal, so as to adjust the input current provided by the power module 101 to the preset current; when the current detection signal is at a first level, the feedback detection module 106 increases the duty cycle of the feedback signal according to the voltage detection signal. When the voltage detection signal is at a first level, the feedback detection module 106 reduces the duty ratio of the feedback signal according to the voltage detection signal to reduce the output voltage of the output module 103 to the preset voltage; when the voltage detection signal is at the second level, the feedback detection module 106 increases the duty ratio of the feedback signal according to the voltage detection signal, so as to increase the output voltage of the output module 103 to the preset voltage. The feedback detection module 106 includes a first diode D1, a second diode D2, and a comparator 1061. The first diode D1 is used to provide the current detection signal in the first level state to a positive input terminal of the comparator 1061. The cathode of the first diode D1 is electrically connected to the first end of the converting capacitor C4, and the anode of the first diode D1 is electrically connected to the positive input end of the comparator 1061. The second diode D2 is used for providing the voltage detection signal in the first level state to a positive input terminal of the comparator 1061. The cathode of the second diode D2 is electrically connected to the output terminal of the error amplifier 1051, and the anode of the second diode D2 is electrically connected to the positive input terminal of the comparator 1061. An inverting input terminal of the comparator 1061 receives the ramp signal Vram, and an output terminal of the comparator 1061 is electrically connected to the PWM control unit 1021. The comparator 1061 is configured to output the feedback signal according to the received current detection signal or the voltage detection signal. In at least one embodiment of the invention, the feedback signal is a periodic square wave signal.

According to the above description, the input current I provided by the power module 101 _in And the output current I of the output module 103 _out And the formula two is satisfied.

Formula two

Wherein, I _in The input current, I, supplied to the power supply module 101 _out Is the output current, V, of the output module 103 _out Is the output voltage, V, of the output module 103 _in Is that it isThe input voltage of the output module 103, D, is the duty cycle of the current detection period T.

At the same time, the invalidation phase T _off Can be calculated by the following formula three.

Formula three

Wherein, T _off In an inactive phase of the second switching signal S2, D is a duty ratio of the second switching signal S2, and T is the current detection period.

Substituting the first formula and the third formula into the second formula to obtain the constant current source I _set And the sampling current I _{out_sens} The following formula four is satisfied.

Formula four

Wherein, I _set Is the constant current source I _set Output current of I _in The input current, K, provided for the power module 101 _sens Is a sampling coefficient, I _{out_sens} For the sampling current, T _off T is the current detection period, which is the inactive period of the second switching signal S2.

According to the contents of formula four, I _set *T _off For the quantity of charge stored on the transfer capacitor C4 during the charging operation, I _{out_sens} * T is the amount of electricity stored on the transfer capacitor C4 at the time of the discharging operation.

The specific working principle of the voltage regulation circuit 300 is as follows:

please refer to fig. 3, which shows the first switching signal S1, the second switching signal S2, the first control signal HSon, the second control signal LSon, the current sensing signal Vdiff and the current I on the inductor _L And (5) a waveform schematic diagram.

Switching to the second level when the first control signal HSon is switched to the second levelWhen the two control signals LSon are switched to the first level, the first transistor Q1 is turned off, the second transistor Q2 is turned on, and the current in the inductor L gradually rises through the second transistor Q2. When the first control signal HSon is at the first level and the second control signal LSon is at the second level, the first transistor Q1 is turned on, the second transistor Q2 is turned off, and the current in the inductor L is gradually discharged through the second transistor Q2. Meanwhile, the current detection module 104 is in the inactive phase T of the current detection phase T _off The second switch SW2 is turned on, and the conversion capacitor C4 is controlled by the constant current source I _set The charging operation is performed. In the invalid phase T _off Ending, the second switch SW2 is cut off, and the conversion capacitor C4 is according to the sampling current I _{out_sens} The discharging operation is performed.

If the electric quantity stored in the conversion capacitor C4 during the charging operation is smaller than the electric quantity stored in the conversion capacitor C4 during the discharging operation, the difference voltage of the conversion capacitor C4 is a negative value, the current detection signal Vdiff is at the first level, that is, it is recognized that the input current provided by the power module 101 is larger than the preset current, the first diode D1 is turned on, the comparator 1061 controls the duty ratio of the feedback signal to be reduced according to the ramp signal and the current detection signal, and the control module 102 adjusts the input current provided by the power module 101 to the preset current according to the adjusted feedback signal, that is, the constant current source I is _set The constant current of (2).

If the electric quantity stored in the conversion capacitor C4 during the charging operation is greater than the electric quantity stored in the conversion capacitor C4 during the discharging operation, the difference voltage of the conversion capacitor C4 is a positive value, and the current detection signal Vdiff is at the second level, that is, it is recognized that the input current of the power module 101 is smaller than the preset current, so that the first diode D1 is turned off, the comparator 1061 controls the duty ratio of the feedback signal to increase according to the ramp signal and the voltage detection signal, and the control module 102 adjusts the input current provided by the power module 101 to the preset current according to the adjusted feedback signal.

If the sampling voltage is less than the reference voltage VREF, the error amplifier 1051 outputs the voltage detection signal in the second level state, that is, it is recognized that the output voltage of the output module 103 is lower than the preset voltage, the second diode D2 is turned off, the comparator 1061 controls the duty ratio of the feedback signal to increase according to the ramp signal and the voltage detection signal, and the control module 102 adjusts the output voltage of the output module 103 to the preset voltage according to the adjusted feedback signal.

If the sampling voltage is greater than the reference voltage VREF, the error amplifier outputs the voltage detection signal in a first level state, that is, it is recognized that the output voltage of the output module 103 is higher than the preset voltage, the second diode D2 is turned on, the comparator 1061 controls the duty ratio of the feedback signal to decrease according to the ramp signal and the voltage detection signal, and the control module 102 adjusts the output voltage of the output module 103 to the preset voltage according to the adjusted feedback signal.

Above-mentioned voltage regulation and control circuit 300 and electronic device 100, through setting up current detection module 104 and voltage detection module 105 is right simultaneously output module 103's output voltage and output current detect when power module 101's input current is greater than preset current, through feedback detection module 106 with control module 102 stabilizes power module 101 provides input current to presetting current output module 103's output voltage is relative when presetting voltage and producing undulant, feedback detection module 106 with control module 102 stabilizes output module 103's output voltage has improved electronic device 100's stability avoids electronic device 100 damages load 200.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A voltage regulation and control circuit receives voltage provided by a power supply module and provides stable voltage and current for a load; the method is characterized in that: the voltage regulation circuit includes:

2. The voltage regulation circuit of claim 1, wherein the current detection module comprises a sampling comparator, a constant current unit, and a current detection unit; the sampling comparator is used for sampling the current of the output module to obtain the sampling current; the constant current unit is used for outputting a constant current to the current detection unit; the current detection unit repeatedly works in a current detection period; the current detection unit converts the received sampling current and the constant current into differential voltage as the current detection signal to the feedback detection module.

3. The voltage regulation circuit of claim 2, wherein the constant current unit comprises a setting resistor and a constant current source; the setting resistor is an adjustable resistor, and the constant current output by the constant current source can be adjusted by adjusting the resistance value of the setting resistor; the constant current is equal to the preset current.

4. The voltage regulation circuit of claim 3 wherein one end of the set resistor is electrically connected to the constant current source and the output terminal of the output module, and the other end of the set resistor is grounded; the output end of the constant current source is electrically connected with the current detection unit.

5. The voltage regulation circuit of claim 3, wherein the current detection unit comprises a first switch, a second switch, and a transfer capacitor; the first switch is controlled by a first switch signal and is used for controlling the conversion capacitor to execute a discharging operation according to the sampling current when the first switch is conducted; the second switch is controlled by a second switch signal and is used for controlling the conversion capacitor to execute charging operation according to the constant current when the conversion capacitor is conducted; the conversion capacitor is used for sequentially executing the charging operation and the discharging operation in the current detection period, and providing a voltage difference between the charging operation and the discharging operation as the current detection signal to the feedback detection module.

6. The voltage regulation circuit of claim 5, wherein one end of the first switch is electrically connected to the output of the sampling comparator, and the other end of the first switch is electrically connected to the first end of the conversion capacitor; one end of the second switch is electrically connected with the constant current source, and the other end of the second switch is electrically connected with the first end of the conversion capacitor; the first end of the conversion capacitor is electrically connected between the first switch and the second switch, and the second end of the conversion capacitor is grounded.

7. The voltage regulation circuit of claim 5, wherein the control module comprises a PWM control unit and a switching unit; the PWM control unit is electrically connected between the feedback detection module and the switch unit; the switching unit includes a first transistor and a second transistor; the PWM control unit outputs a first control signal to the first transistor and outputs a second control signal to the second transistor; the PWM control unit adjusts the duty ratio of the first control signal and the second control signal according to a feedback signal provided by the feedback detection module; the first transistor is used for establishing or cutting off the electrical connection between the power supply module and the output module; the second transistor is used for establishing or cutting off a discharge path of the power supply module.

8. The voltage regulation circuit of claim 7, wherein the first switching signal and the second control signal have the same period and are opposite in phase.

9. The voltage regulation circuit of any one of claims 1-8, wherein the feedback detection module comprises a first diode, a second diode, and a comparator; the first diode is used for providing the current detection signal in the first level state to a positive input end of the comparator; the cathode of the first diode receives the current detection signal, and the anode of the first diode is electrically connected with the positive input end of the comparator; the second diode is used for providing the voltage detection signal in a first level state to a positive input end of the comparator; the cathode of the second diode receives the voltage detection signal, and the anode of the second diode is electrically connected with the positive input end of the comparator; the reverse input end of the comparator receives a ramp signal, and the output end of the comparator is electrically connected with the control module; the comparator is used for adjusting the duty ratio of the feedback signal according to the received current detection signal or the voltage detection signal and the ramp signal.

10. An electronic device for providing stable voltage and current to a load comprises a power supply module and a voltage regulation and control circuit; the voltage regulation and control circuit is used for regulating the voltage provided by the power supply module; the method is characterized in that: the voltage regulation and control circuit adopts the voltage regulation and control circuit as claimed in any one of claims 1 to 9.