CN111130363A - High-integration power converter - Google Patents

Abstract

The invention discloses a highly integrated power converter, which comprises an alternating current-direct current conversion circuit, a transformer, an output voltage stabilizing circuit and a main control circuit, wherein the transformer is used for converting high-voltage direct current into pulse direct current; the input end of the output voltage stabilizing circuit is connected with the output end of the transformer, and the output voltage stabilizing circuit is used for converting the pulse direct current into low-voltage direct current for output; a switch tube and a driving module are arranged in the main control circuit, and the main control circuit is used for controlling the transformer to transform; the high-integration power converter can bear high-voltage power tubes by arranging the switch tubes to bear high-voltage power tubes, can bear high pulse power impact, avoids the situation that the switch tubes cannot normally work due to breakdown, reduces primary absorption circuits, simplifies circuits, reduces components, reduces production efficiency of whole power finished products, reduces repair rate of the power finished products, and reduces comprehensive cost of products.

Description

High-integration power converter

Technical Field

The invention relates to the technical field of power converters, in particular to a high-integration power converter.

Background

Low power chargers are mainly used for power supply and battery charging of personal care products, as shown in fig. 1, existing low current personal care product chargers are relatively low integrated. For example, the charger within 2W has low integration level, complex peripheral circuit, relatively more components, large inductance of the transformer, complex manufacturing process, low production efficiency of the whole power supply finished product, high labor cost, high manufacturing cost, high repair rate of the power supply finished product and high comprehensive cost of the product. In addition, the accuracy of the output voltage is not high, the error of the output voltage is generally between 10 and 20 percent, the calibration accuracy of the output current is not high, and the error of the output voltage is generally between 10 and 20 percent.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, it is an object of the present invention to provide a highly integrated power converter.

To achieve the above object, a highly integrated power converter according to an embodiment of the present invention includes:

the alternating current-direct current conversion circuit is used for converting input alternating current into high-voltage direct current;

one end of the input end of the transformer is connected with the alternating current-direct current conversion circuit, and the transformer is used for converting the high-voltage direct current into pulse direct current;

the input end of the output voltage stabilizing circuit is connected with the output end of the transformer, and the output voltage stabilizing circuit is used for converting the pulse direct current into low-voltage direct current to be output;

the transformer comprises a main control circuit, a switching tube and a driving module are arranged in the main control circuit, the control end of the switching tube is connected with the signal output end of the driving module, one signal output end of the switching tube is connected with the other end of the input end of the transformer, the other signal output end of the switching tube is connected with a reference ground, and the main control circuit is used for controlling the transformer to transform;

the switch tube is a power tube capable of bearing high voltage.

Further, according to an embodiment of the present invention, the master control circuit further includes:

and the PWM valley bottom detection module is connected with the driving module and used for detecting the valley of the switching waveform and controlling the conduction of the switching tube through the driving module.

Further, according to an embodiment of the present invention, the master control circuit further includes:

the frequency jittering control module is connected with the driving module and used for controlling the switching tube to output periodic frequency change modulation pulses through the driving module.

Further, according to an embodiment of the present invention, the main control circuit further includes an over-temperature protection module, and the over-temperature protection module is connected to the driving module, and is configured to control the switching tube to be turned off through the driving module when detecting that the temperature is too high.

Further, according to an embodiment of the present invention, the highly integrated power converter further includes:

the voltage feedback circuit is connected with the transformer and the main control circuit;

the master control circuit further comprises a voltage detection module and/or an accurate constant voltage control module, the voltage detection module is connected with the voltage feedback circuit, the accurate constant voltage control module is respectively connected with the voltage detection module and the driving module, and the low-voltage direct current voltage output is accurately regulated through the driving module.

Further, according to an embodiment of the present invention, the voltage feedback circuit includes: the voltage detection circuit comprises a resistor R4 and a resistor R5, wherein one end of the resistor R4 is connected with one end of the transformer, the other end of the resistor R4 is connected with the voltage detection end of the voltage detection module and one end of the resistor R5, and the other end of the resistor R5 is connected with a reference ground.

Further, according to an embodiment of the present invention, the main control circuit further includes an over-voltage and under-voltage protection module, and the under-voltage protection module is connected to the transformer and the main control circuit, and is configured to control the switching tube to be turned off through the driving module when it is detected that the discharge feedback voltage is too low.

Further, according to an embodiment of the present invention, the highly integrated power converter further includes:

the current feedback circuit is connected with the main control circuit;

the main control circuit further comprises an accurate constant current control module, and the accurate constant current control module is respectively connected with the current feedback circuit and the driving module so as to accurately regulate the output of the low-voltage direct current through the driving module.

Further, according to an embodiment of the present invention, the current feedback circuit includes: and the other signal output end of the switch tube is connected with a reference ground through the resistor R7, and the end, far away from the reference ground, of the resistor R7 is connected with the circuit detection end of the current detection module.

Further, according to an embodiment of the present invention, the highly integrated power converter further includes:

the power supply circuit is respectively connected with the transformer and the power supply end of the main control circuit so as to convert the voltage of the transformer into stable power supply voltage;

and the voltage generation module is connected with the power supply circuit and used for converting the power supply voltage output by the power supply circuit into the internal power supply voltage of the main control circuit.

In the embodiment of the invention, the switch tube is set to bear a high-voltage power tube. The high-voltage pulse power supply can bear high pulse power supply impact, the phenomenon that a switch tube cannot normally work due to breakdown is avoided, primary absorption circuits are reduced, the circuit is simpler, components are fewer, the production efficiency of a whole power supply finished product is low, the repair rate of the power supply finished product is low, and the comprehensive cost of the product is low. When the PWM valley bottom detection module detects that the waveform on the switching tube is at the valley value, the switching tube is switched on, so that the switching loss of the switching tube is reduced, and the energy conversion efficiency of the switching tube is improved. An electromagnetic filter capacitor circuit and a secondary absorption circuit are omitted through the frequency-shaking control module and the driving module, so that the comprehensive cost of the product is low, and the precision of the output voltage and the output current is provided through the accurate constant-voltage control module and the accurate constant-current control module.

Drawings

FIG. 1 is a circuit diagram of a prior art power converter;

FIG. 2 is a circuit diagram of a highly integrated power converter according to an embodiment of the present invention;

fig. 3 is a block diagram of a main control circuit according to an embodiment of the present invention.

Reference numerals:

a primary absorption circuit 10;

a secondary absorption circuit 20;

an electromagnetic filter capacitance circuit 30;

an ac-dc conversion circuit 40;

a transformer 50;

an output voltage stabilizing circuit 60;

a main control circuit 70;

a switch tube 701;

a driver module 702;

a PWM valley bottom detection module 703;

a jitter frequency control module 704;

an over-temperature protection module 705;

a precision constant voltage control module 706;

a voltage detection module 707;

a precision constant flow control module 708;

a current detection module 709;

an over-voltage and under-voltage protection module 711;

a voltage generation module 712;

a start module 713;

a first line compensation module 715;

a second line compensation module 716;

a third line compensation module 717;

a timer 714;

a power supply circuit 80;

a voltage feedback circuit 90;

a current feedback circuit 11.

The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.

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. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to fig. 2 and 3, an embodiment of the present invention provides a highly integrated power converter, including: the alternating current-direct current conversion circuit 40 is used for converting input alternating current into high-voltage direct current; as shown in fig. 2, the ac-dc conversion circuit 40 is connected to an ac output terminal through a power interface (L/N), and the ac may be a commercial ac. In an embodiment of the present invention, the ac/dc conversion circuit 40 includes a bridge rectifier circuit BD1 and a voltage regulator circuit, the bridge rectifier circuit BD1 rectifies input ac power into a pulse dc power supply, outputs the pulse dc power supply to the voltage regulator circuit, rectifies the pulse dc power supply into a regulated high-voltage dc power by the voltage regulator circuit, and outputs the regulated high-voltage dc power to the transformer 50. The voltage stabilizing circuit comprises an inductor L2 and a capacitor EC2, and a low-pass filter circuit is formed by the inductor L2 and the capacitor EC 2. Therefore, a high-frequency power supply signal in the power supply signal at the output end of the bridge rectifier circuit BD1 is filtered, and a stable direct-current power supply is output.

One end of the input end of the transformer 50 is connected with the alternating current-direct current conversion circuit 40, and the transformer 50 is used for converting the high-voltage direct current into pulse direct current; the transformer 50 performs pulse adjustment and voltage transformation output of the high voltage direct current under the action of the pulse signal of the main control circuit.

The input end of the output voltage stabilizing circuit 60 is connected with the output end of the transformer 50, and the output voltage stabilizing circuit 60 is used for converting the pulse direct current into low-voltage direct current for output; the output voltage stabilizing circuit 60 receives the pulse-adjusted power signal output from the transformer 50 and stabilizes the pulse-adjusted power signal to output a stable direct current to supply power to the power supply apparatus. As shown in fig. 2, in one embodiment of the present invention, the output voltage stabilizing circuit 60 includes a diode D2 and a capacitor EC2, the anode of the diode D2 is connected to the secondary output terminal of the transformer 50, the cathode of the diode D2 is connected to one terminal of the capacitor EC4, and the terminal of the capacitor EC4 is connected to the ground reference. The diode D2 prevents the electric quantity in the capacitor EC4 from flowing back to the transformer 50, and the capacitor EC2 stabilizes the voltage of the pulse dc at the output of the transformer 50 and outputs the stabilized voltage. Two ends of the capacitor EC4 are connected with the electric equipment to provide stable direct current power supply for the electric equipment.

A switch tube 701 and a driving module 702 are arranged in the main control circuit 70, a control end of the switch tube 701 is connected with a signal output end of the driving module 702, one signal output end of the switch tube 701 is connected with the other end of the input end of the transformer 50, the other signal output end of the switch tube 701 is connected with a reference ground, and the main control circuit 70 is used for controlling the transformer 50 to transform; as shown in fig. 2 and 3, a switching tube 701 is disposed between the transformer 50 and a reference ground to pulse the transformer 50. The driving module 702 is configured to generate a pulse modulation signal and drive the switching tube 701 to be turned on or off through the control end of the switching tube 701. Thereby controlling the on/off of the current on the primary coil of the transformer 50 and realizing the pulse modulation of the power on the primary coil of the transformer 50.

The switch tube 701 is a power tube capable of bearing high voltage. As shown in fig. 2, in the implementation of the present invention, by setting the switch tube 701 as a power tube capable of withstanding a high voltage, a high voltage pulse can be endured, and since the current on the transformer 50 is cut off by the switch tube 701, a high pulse voltage may be generated, and this pulse voltage may break down the switch tube 701, which results in that the switch cannot work normally. The high voltage pulse signal generated by the transformer 50 can be absorbed by the primary absorption circuit 10 in fig. 1. But adds peripheral circuits to the power converter, resulting in high cost and complex circuit configuration.

In the embodiment of the invention, the switch tube 701 is set to be capable of bearing a high-voltage power tube. The high-voltage power supply can bear high pulse power supply impact, the phenomenon that the switch tube 701 cannot work normally due to breakdown is avoided, the number of primary absorption circuits 10 is reduced, the circuit is simpler, the number of components is relatively small, the production efficiency of the whole power supply finished product is low, the repair rate of the power supply finished product is low, and the comprehensive cost of the product is low. In one embodiment of the present invention, the switch tube 701 is a power tube capable of withstanding a high voltage of 800V.

Referring to fig. 3, the main control circuit 70 further includes: the PWM (pulse-width modulation) valley bottom detection module 703 is connected to the driving module 702, and is configured to detect a valley of a switching waveform and control the conduction of the switching tube 701 through the driving module 702. As shown in fig. 3, the PWM valley detection module 703 detects the valleys of the switching waveform. For example, the PWM valley detection module 703 may obtain the valley information of the waveform on the switching tube 701 by detecting the power switch waveform on the switching tube 701, and when the switching waveform is detected to be at the valley, the driving module 702 turns on the switching tube 701 at this time to reduce the switching conduction loss of the switching tube 701. Because switch tube 701 has certain on-resistance, certain conduction loss can be produced when switching on to on resistance, in practical application, the conduction loss of switch tube 701 should be reduced as far as possible, when detecting that the waveform on switch tube 701 is in the valley value through PWM valley detection module 703, at this moment, switch tube 701 is said to be led to reduce the switching loss of switch tube 701, improved switch tube 701's energy conversion efficiency.

Referring to fig. 3, the main control circuit 70 further includes: the jitter frequency control module 704 is connected to the driving module 702, and is configured to control the switching tube 701 to output a modulation pulse with a periodically varying frequency through the driving module 702. Because the traditional pulse generator mainly generates a fixed working frequency to pulse the high-voltage direct-current power supply. The modulated pulse direct current is concentrated on a fixed frequency due to energy, so that the modulated power signal output by the transformer 50 generates a strong electromagnetic interference signal, and an excessively high electromagnetic interference signal may cause that the electromagnetic compatibility detection of the electronic device cannot be passed. At this time, as shown in fig. 1, the electromagnetic interference signal may be filtered out by the electromagnetic filter capacitance circuit 30. But adds peripheral circuits to the power converter, resulting in high cost and complex circuit configuration. In the embodiment of the present invention, the frequency jitter control module 704 and the driving module 702 generate the pulse modulation signal that periodically changes, and the frequency is shifted by the pulse modulation signal that periodically changes, so as to reduce the generation of the electromagnetic interference signal. According to different output loads, the working frequency of the primary main control circuit 70IC changes, and if the load is heavy, the working frequency is high; the load is light, the working frequency is low, so that the EMI (Electro Magnetic Interference) noise of the switch circuit is reduced, an electromagnetic filter capacitor circuit 30 and a secondary absorption circuit 20 are omitted, the number of components is relatively small, the production efficiency of the whole power supply finished product is low, the repair rate of the power supply finished product is low, and the comprehensive cost of the product is low.

Referring to fig. 3, the main control circuit 70 further includes an over-temperature protection module 705, where the over-temperature protection module 705 is connected to the driving module 702 and is configured to control the switching tube 701 to be turned off through the driving module 702 when detecting that the temperature is too high. The over-temperature protection module 705 is configured to detect a temperature value of the high-integration power converter, and control the switching tube 701 to be turned off by the driving module 702 when the temperature value is higher than a set value, so as to implement over-temperature protection on the circuit.

Referring to fig. 2 and 3, the highly integrated power converter further includes: the voltage feedback circuit 90, the voltage feedback circuit 90 is connected with the transformer 50 and the main control circuit 70; as shown in fig. 2, a voltage feedback circuit 90 is disposed between the transformer 50 and the main control circuit 70 to feed back the voltage on the transformer 50 to the main control circuit 70, so that the main controller adjusts the output pulse width according to the feedback voltage value. So that the output supply voltage remains stable.

The main control circuit 70 further includes a voltage detection module 707 and/or an accurate constant voltage control module 706, the voltage detection module 707 is connected to the voltage feedback circuit 90, and the accurate constant voltage control module 706 is connected to the voltage detection module 707 and the driving module 702 respectively, so as to output an accurate adjustment to the low-voltage dc voltage through the driving module 702. As shown in fig. 3, the voltage detection module 707 performs voltage detection on the power voltage output by the voltage feedback circuit 90, for example, the voltage is output after being compared with a reference voltage, the voltage output by the voltage detection module 707 can reflect an actual voltage value at the end of the transformer 50, the voltage detection module 707 outputs the detected voltage to the precise constant voltage control module 706, the precise constant voltage control module 706 adjusts the output pulse width according to a feedback voltage signal, so as to output a corresponding PWM waveform pulse width through the driving module 702, thereby achieving the purpose that the output power of the highly integrated power converter is a constant voltage power, and the precision of the output voltage is 5-8%.

Referring to fig. 2, the voltage feedback circuit 90 includes: one end of a resistor R4 and a resistor R5, one end of a resistor R4 is connected with one end of the transformer 50, the other end of a resistor R4 is respectively connected with a voltage detection end of the voltage detection module 707 and one end of a resistor R5, and the other end of a resistor R5 is connected with a reference ground. As shown in fig. 2, the resistor R4 and the resistor R5 are connected in series to divide the voltage of the transformer 50 and output the divided voltage to the voltage feedback terminal of the main control circuit 70. The voltage is divided by the resistor R4 and the resistor R5 and then fed back to the main control circuit 70, so that the feedback power supply can meet the voltage requirement of the main control circuit 70.

Referring to fig. 3, the main control circuit 70 further includes an over-voltage and under-voltage protection module 711, which is connected to the transformer 50 and the main control circuit 70, and is configured to control the switching tube 701 to be turned off through the driving module 702 when the discharging feedback voltage is detected to be too low. As shown in fig. 3, the overvoltage and undervoltage protection module 711 detects the feedback power of the voltage feedback circuit 90, for example, compares the feedback power with a reference voltage and outputs the comparison result, the voltage output by the overvoltage and undervoltage protection module 711 may reflect the actual voltage value at the end of the transformer 50, and when the feedback voltage detected by the undervoltage protection module is too low, it indicates that the power circuit needs undervoltage protection. At this time, the under-voltage protection module controls the switching tube 701 to be turned off through the driving module 702, so as to implement the under-voltage protection of the circuit.

Referring to fig. 2 and 3, the highly integrated power converter further includes: the current feedback circuit 11, the current feedback circuit 11 is connected with the master control circuit 70; as shown in fig. 2, the current feedback circuit 11 is disposed between the main control circuit 70 and the reference ground to feed back the current of the switch tube 701 on the main control circuit 70 to the current detection end of the main control circuit 70, so that the main controller adjusts the output pulse width according to the feedback current value. So that the output supply current remains stable.

The main control circuit 70 further includes a precise constant current control module 708, and the precise constant current control module 708 is respectively connected to the current feedback circuit 11 and the driving module 702, so as to precisely adjust the output of the low-voltage dc current through the driving module 702. As shown in fig. 3, the accurate constant-voltage control module 708 detects the power voltage output by the current feedback circuit 11, the detected voltage value can reflect the actual current magnitude of the switching tube 701, the accurate constant-voltage control module 706 adjusts the output pulse width according to the voltage signal fed back by the current feedback circuit 11, so as to output the corresponding PWM waveform pulse width through the driving module 702, thereby achieving the purpose that the output power of the highly integrated power converter is a constant-current power supply, and the output current precision is 5-8% higher.

Referring to fig. 2, the current feedback circuit 11 includes: the other signal output end of the switch tube 701 is connected to the reference ground through a resistor R7, and the end of the resistor R7 far away from the reference ground is connected to the circuit detection end of the current detection module 709. As shown in fig. 2, the resistor R7 is a current sampling resistor, and is arranged between the current output end of the primary loop of the transformer 50 and the reference ground to realize voltage sampling of the primary loop current.

Referring to fig. 2 and 3, the highly integrated power converter further includes: the power supply circuit 80 and the voltage generation module 712, the power supply circuit 80 is respectively connected with the transformer 50 and the power supply end of the main control circuit 70 to convert the voltage of the transformer 50 into a stable power supply voltage; as shown in fig. 2, the power supply circuit 80 includes a filter capacitor C1 and a diode D1, one end of the filter capacitor C1 is connected to the second secondary winding of the transformer 50, and the other end of the capacitor C1 is connected to the ground reference, so as to stabilize the voltage transformed and outputted by the transformer 50. The anode of the diode D1 is connected to one end of the filter capacitor C1, and the cathode of the diode D1 is connected to the power supply terminal of the main control circuit 70 to output power to the main control circuit 70, so as to supply power to the main control circuit 70.

The voltage generating module 712 is connected to the power supply circuit 80, and is configured to convert the power supply voltage output by the power supply circuit 80 into an internal power supply voltage of the main control circuit 70. As shown in fig. 3, the voltage generating module 712 supplies power to each circuit module in the main control circuit 70 by performing voltage conversion on the external output power voltage, and since the external input power voltage may not meet the power supply requirement of each circuit module in the main control circuit 70, the voltage generating module 712 may convert the input power voltage into a power supply voltage meeting each circuit module in the main control circuit 70, thereby supplying power to the power supply circuit 80 module in the main control circuit 70.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A highly integrated power converter, comprising:

the alternating current-direct current conversion circuit is used for converting input alternating current into high-voltage direct current;

one end of the input end of the transformer is connected with the alternating current-direct current conversion circuit, and the transformer is used for converting the high-voltage direct current into pulse direct current;

the input end of the output voltage stabilizing circuit is connected with the output end of the transformer, and the output voltage stabilizing circuit is used for converting the pulse direct current into low-voltage direct current to be output;

the transformer comprises a main control circuit, a switching tube and a driving module are arranged in the main control circuit, the control end of the switching tube is connected with the signal output end of the driving module, one signal output end of the switching tube is connected with the other end of the input end of the transformer, the other signal output end of the switching tube is connected with a reference ground, and the main control circuit is used for controlling the transformer to transform;

the switch tube is a power tube capable of bearing high voltage.

2. The highly integrated power converter of claim 1, wherein the master circuit further comprises:

and the PWM valley bottom detection module is connected with the driving module and used for detecting the valley of the switching waveform and controlling the conduction of the switching tube through the driving module.

3. The highly integrated power converter of claim 1, wherein the master circuit further comprises:

and the frequency jitter control module is connected with the driving module and is used for controlling the switching tube to output periodic frequency variation modulation pulses through the driving module.

4. The highly integrated power converter according to claim 1, wherein the main control circuit further comprises an over-temperature protection module, and the over-temperature protection module is connected to the driving module and configured to control the switching tube to be turned off by the driving module when detecting that the temperature is too high.

5. The highly integrated power converter of claim 1, further comprising:

the voltage feedback circuit is connected with the transformer and the main control circuit;

the master control circuit further comprises a voltage detection module and/or an accurate constant voltage control module, the voltage detection module is connected with the voltage feedback circuit, the accurate constant voltage control module is respectively connected with the voltage detection module and the driving module, and the low-voltage direct current voltage output is accurately regulated through the driving module.

6. The highly integrated power converter of claim 5, wherein the voltage feedback circuit comprises: the voltage detection circuit comprises a resistor R4 and a resistor R5, wherein one end of the resistor R4 is connected with one end of the transformer, the other end of the resistor R4 is connected with the voltage detection end of the voltage detection module and one end of the resistor R5, and the other end of the resistor R5 is connected with a reference ground.

7. The highly integrated power converter according to claim 6, wherein the main control circuit further comprises an over-voltage and under-voltage protection module, and the under-voltage protection module is connected to the transformer and the main control circuit, and is configured to control the switching tube to be turned off by the driving module when the discharging feedback voltage is detected to be too low.

8. The highly integrated power converter of claim 1, further comprising:

the current feedback circuit is connected with the main control circuit;

the main control circuit further comprises an accurate constant current control module, and the accurate constant current control module is respectively connected with the current feedback circuit and the driving module so as to accurately regulate the output of the low-voltage direct current through the driving module.

9. The highly integrated power converter of claim 8, wherein the current feedback circuit comprises: and the other signal output end of the switch tube is connected with a reference ground through the resistor R7, and the end, far away from the reference ground, of the resistor R7 is connected with the circuit detection end of the current detection module.

10. The highly integrated power converter of claim 1, further comprising:

the power supply circuit is respectively connected with the transformer and the power supply end of the main control circuit so as to convert the voltage of the transformer into stable power supply voltage;

and the voltage generation module is connected with the power supply circuit and used for converting the power supply voltage output by the power supply circuit into the internal power supply voltage of the main control circuit.

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