An adaptive self-powered converter and an adaptive self-powered method

Abstract

The present invention discloses an adaptive self-powered converter and an adaptive self-powered method, and relates to the technical field of switching power supplies. The adaptive self-powered method comprises: detecting whether the VCC voltage drops to the stop self-powered voltage level through a self-powered judgment unit, and outputting a self-powered judgment signal to control whether to start self-powered; adding and subtracting the self-powered time code word according to the VCC voltage through a self-powered time code word calculation unit, and transmitting the self-powered time code word to a self-powered time control unit; controlling the self-powered time according to the self-powered time code word through the self-powered time control unit; the self-powered control unit controls the opening and closing of the first and second switch tubes according to the self-powered time and the self-powered judgment signal, so as to realize adaptive self-powered. The adaptive self-powered converter and the adaptive self-powered method disclosed by the present invention can dynamically adjust the self-powered time code word according to the VCC voltage situation, and then adjust the self-powered time to realize adaptive self-powered.

Description

Technical Field

[0001] The present invention relates to the technical field of switching power supplies, and in particular to an adaptive self-powered converter and an adaptive self-powered method. Background Art

[0002] In switching power conversion circuits, such as Flyback and Buck topology circuits, the traditional method for the chip to control the VCC voltage of the power supply part is to use the auxiliary winding of the transformer and make the VCC voltage proportional to the output voltage through transformer coupling to achieve the power supply target.

[0003] For the converter circuit of the traditional power supply method, when the primary side power tube is turned off and the secondary rectifier tube is turned on for rectification, the voltage on the auxiliary winding of the transformer is positive and proportional to the voltage on the output capacitor. This auxiliary winding voltage can supply power to the VCC capacitor. The VCC voltage of this power supply method is proportional to the output. If the output voltage is too low, VCC will not be able to supply power; if the output voltage is too high, the VCC voltage will be overvoltage, requiring a voltage stabilization circuit, increasing losses. Moreover, most of the current chargers use fast charging, and the output voltage varies from 3.3V to 20V. If this power supply method is used, the range of VCC will be very large, the chip's voltage resistance must be improved, or a voltage stabilization circuit must be used, all of which will increase costs and losses. Therefore, the self-power supply method in which the VCC voltage does not change with the output voltage and does not add additional devices is increasingly favored by designers.

[0004] In the converter circuit of the existing self-powered method, when the primary side power tube is turned on, VCC is powered for a certain period of time. During this period of time, the first switch tube is turned off, the second switch tube is turned on, and the primary side main circuit current charges the power supply VCC through the second switch tube. At other times, the first switch tube is turned on, the second switch tube is turned off, and the primary side main circuit current flows through the primary side main power circuit and passes through the first switch tube to the ground. For the existing self-powered method, generally when the VCC voltage is lower than the power supply level, the VCC capacitor is charged in the self-powered stage during the next primary side power conduction time until the VCC voltage reaches the set value. This requires real-time detection of the VCC voltage during power supply. In this process, it will be affected by the ESR of the VCC capacitor, especially the electrolytic capacitor, which will affect the accuracy of the VCC voltage detection. At the same time, the system operating frequency generally changes with the load. When the load is light and the frequency is small, the system may use a relatively small peak current. Therefore, the power supply required for the power supply VCC will be different. In addition, when different line voltages are input, even if the peak current is the same, the primary main power tube conduction time of the high line voltage is shorter than that of the low line voltage. If the same power supply time is used for charging, overvoltage or undervoltage may occur.

[0005] Therefore, there is an urgent need for an adaptive self-powering method in which the power supply time can be changed according to factors such as operating frequency, input line voltage, peak current, etc. Summary of the invention

[0006] The purpose of the present invention is to provide an adaptive self-powered converter and an adaptive self-powered method, which can dynamically adjust the self-powered time code according to the VCC voltage condition, and then adjust the self-powered time to achieve adaptive self-powered.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] An adaptive self-powered converter comprises: an input port, a first rectifier, a first capacitor, a transformer, a second rectifier, a second capacitor, an output port, a third capacitor, a primary-side power switch tube, a detection resistor and a primary controller;

[0009] The input port is coupled to an alternating current voltage VAC;

[0010] The first rectifier S1 is coupled to the input port to convert the AC voltage VAC into a DC voltage VIN;

[0011] The first capacitor C1 is coupled to the first rectifier S1 to filter the DC voltage VIN output by the first rectifier S1;

[0012] The second rectifier S2 is coupled to a second capacitor C2;

[0013] The second capacitor C2 is coupled to the output port;

[0014] The output port provides a DC voltage VO and a DC current IO to the load;

[0015] The third capacitor C3 is coupled to the primary controller to store and provide energy required for the primary controller to work;

[0016] The primary side power switch tube Q1 is coupled to the primary controller and the first winding NP of the transformer;

[0017] The transformer includes a first winding NP coupled to a first capacitor C1; a second winding NS coupled to a second capacitor C2 and a second rectifier S2; and a third winding NA coupled to detection resistors R1 and R2;

[0018] The detection resistors R1 and R2 are coupled to the third winding NA of the transformer, and the common end is coupled to the primary controller;

[0019] The primary controller includes a first switch tube SW1, a second switch tube SW2, a drive control circuit and an adaptive self-power supply control circuit;

[0020] The first switch tube SW1 is coupled to the adaptive self-power supply control circuit and the primary side power switch tube Q1 to control the direction of the current;

[0021] The second switch tube SW2 is coupled to the adaptive self-power supply control circuit, the primary side power switch tube Q1 and the third capacitor C3 to charge the third capacitor C3;

[0022] The drive control circuit is coupled to the primary side power switch tube Q1 and the adaptive self-power supply control circuit;

[0023] The adaptive self-power supply control circuit controls the opening and closing of the first switch tube SW1 and the second switch tube SW2 to adaptively control the power supply time;

[0024] The adaptive self-powered control circuit comprises a self-powered judgment unit, a self-powered time codeword calculation unit, a self-powered time control unit and a self-powered control unit;

[0025] The self-power supply determination unit is used to detect and determine whether the VCC voltage drops to the stop self-power supply voltage V STOP_REF , and output a self-powered judgment signal CH_EN;

[0026] The self-powered time code word calculation unit is used to calculate the addition and subtraction of the self-powered time code word according to the VCC voltage to output the self-powered time code word DATA CH_TIME ;

[0027] The self-powered time control unit is used to CH_TIME Generates a self-powered time signal T CH ;

[0028] The self-powered control unit is used to CH The self-power supply judgment signal CH_EN controls the opening and closing of the first switch tube SW1 and the second switch tube SW2 to achieve adaptive self-power supply.

[0029] Optionally, the self-powered judgment unit comprises a first comparator A1; a first input terminal of the first comparator A1 is coupled to a VCC voltage, and a second input terminal of the first comparator A1 is coupled to a stop self-powered voltage V STOP_REF The output terminal of the first comparator A1 generates a self-power supply determination signal CH_EN, which is coupled to the input terminal of the self-power supply control unit.

[0030] Optionally, the self-powered time code word calculation unit includes a second comparator A2 and a self-powered time code word addition and subtraction unit;

[0031] The first input terminal of the second comparator A2 is coupled to the VCC voltage, and the second input terminal of the second comparator A2 is coupled to the self-powered reference voltage V CH_REF The output end of the second comparator A2 generates a comparison result ADD_CH, which is coupled to the input end of the self-powered time code word addition and subtraction unit; the output end of the self-powered time code word addition and subtraction unit generates a self-powered time code word DATA CH_TIME , coupled to the input terminal of the self-powered time control unit.

[0032] Optionally, the self-powered time control unit includes a first current source I1, a fourth capacitor C4, a self-powered time code word conversion voltage unit and a third comparator A3;

[0033] The output end of the first current source I1 is coupled to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is coupled to the ground;

[0034] The input end of the self-powered time code word to voltage unit is coupled to the self-powered time code word DATA CH_TIME The output end of the self-powered time code word conversion voltage unit generates a self-powered time voltage level V CH_TIME , coupled to the first input terminal of the third comparator A3;

[0035] The second input terminal of the third comparator A3 is coupled to the first terminal of the fourth capacitor C4. The output terminal of the third comparator A3 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

[0036] Optionally, the self-powered time control unit includes a second current source I2, a capacitor array, a self-powered time code word conversion voltage unit and a fourth comparator A4;

[0037] The output end of the second current source I2 is coupled to the first end of the capacitor array, the second end of the capacitor array is coupled to the ground, and the third end of the capacitor array is coupled to the self-powered time code word DATA CH_TIME ;

[0038] Fixed self-powered time voltage level V CH_TIME , coupled to the first input terminal of the fourth comparator A4;

[0039] The second input terminal of the fourth comparator A4 is coupled to the first terminal of the capacitor array, and the output terminal of the fourth comparator A4 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

[0040] Optionally, the self-powered time control unit includes a first voltage-controlled current source, a fifth capacitor C5, a self-powered time code word conversion voltage unit and a fifth comparator A5;

[0041] An input terminal of the first voltage-controlled current source is coupled to a feedback voltage FB, an output terminal of the first voltage-controlled current source is coupled to a first terminal of a fifth capacitor C5, and a second terminal of the fifth capacitor C5 is coupled to ground;

[0042] The input end of the self-powered time code word to voltage unit is coupled to the self-powered time code word DATA CH_TIME The output end of the self-powered time code word conversion voltage unit generates a self-powered time voltage level V CH_TIME , coupled to the first input terminal of the fifth comparator A5;

[0043] The second input terminal of the fifth comparator A5 is coupled to the first terminal of the fifth capacitor C5. The output terminal of the fifth comparator A5 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

[0044] Optionally, the self-powered time control unit includes a second voltage-controlled current source, a capacitor array, a self-powered time code word conversion voltage unit and a sixth comparator A6;

[0045] The input end of the second voltage-controlled current source is coupled to the feedback voltage FB, the output end of the second voltage-controlled current source is coupled to the first end of the capacitor array, the second end of the capacitor array is coupled to the ground, and the third end of the capacitor array is coupled to the self-powered time code word DATA CH_TIME ;

[0046] Fixed self-powered time voltage level V CH_TIME , coupled to the first input terminal of the sixth comparator A6;

[0047] The second input terminal of the sixth comparator A6 is coupled to the first terminal of the capacitor array, and the output terminal of the sixth comparator A6 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

[0048] An adaptive self-powering method is applied to the adaptive self-powering converter, and the adaptive self-powering method comprises:

[0049] The self-power supply determination unit compares the VCC voltage with the stop self-power supply voltage V STOP_REF When the VCC voltage is detected to be lower than the stop self-power supply voltage V STOP_REF When the self-power supply judgment unit outputs the self-power supply judgment signal CH_EN=1, controls the self-power supply control unit to start the self-power supply in the next PWM, otherwise the self-power supply is not started;

[0050] The self-powered time code word calculation unit converts the VCC voltage into a self-powered reference voltage V CH_REFThe comparison is performed and the comparison result ADD_CH is output to the self-powered time code word addition and subtraction unit to add and subtract the time code word. When the VCC voltage is lower than the self-powered reference voltage V CH_REF When ADD_CH=1, the self-powered time code word DATA CH_TIME Increase one gear, otherwise decrease one gear;

[0051] The self-powered time code word conversion unit of the self-powered time control unit converts the self-powered time code word DATA CH_TIME Converted into the corresponding self-powered time voltage level V CH_TIME , whenever the self-powered time code word DATA CH_TIME Plus or minus one gear, self-powered time voltage level V CH_TIME Add or subtract a voltage step, corresponding to the self-powered time signal T CH Just add or subtract a fixed time width T CH_STEP The first current source I1 charges the fourth capacitor C4. When the capacitor voltage V C4 Reaching the self-powered voltage level V CH_TIME When the self-power supply is stopped, the self-power supply control unit sends an instruction to turn off the second switch tube SW2 and turn on the first switch tube SW1 to end the current self-power supply.

[0052] An adaptive self-powering method is applied to the adaptive self-powering converter, and the adaptive self-powering method comprises:

[0053] The self-power supply determination unit compares the VCC voltage with the stop self-power supply voltage V STOP_REF When the VCC voltage is detected to be lower than the stop self-power supply voltage V STOP_REF When the self-power supply judgment unit outputs the self-power supply judgment signal CH_EN=1, controls the self-power supply control unit to start the self-power supply in the next PWM, otherwise the self-power supply is not started;

[0054] The self-powered time code word calculation unit converts the VCC voltage into a self-powered reference voltage V CH_REF The comparison is performed and the comparison result ADD_CH is output to the self-powered time code word addition and subtraction unit to add and subtract the time code word. When the VCC voltage is lower than the self-powered reference voltage VCH_REF, ADD_CH=1, and the self-powered time code word DATA CH_TIME Increase one gear, otherwise decrease one gear;

[0055] The self-powered time control unit maintains the self-powered time voltage level V CH_TIME Fixed, according to the self-powered time code word DATA CH_TIME Select the number of capacitors in the capacitor array to change the capacitor size, thereby changing the self-powered time signal T CH , thereby achieving adaptive self-powering.

[0056] An adaptive self-powering method is applied to the adaptive self-powering converter, and the adaptive self-powering method comprises:

[0057] The self-power supply determination unit compares the VCC voltage with the stop self-power supply voltage V STOP_REF When the VCC voltage is detected to be lower than the stop self-power supply voltage V STOP_REF When the self-power supply judgment unit outputs the self-power supply judgment signal CH_EN=1, controls the self-power supply control unit to start the self-power supply in the next PWM, otherwise the self-power supply is not started;

[0058] The self-powered time code word calculation unit converts the VCC voltage into a self-powered reference voltage V CH_REF The comparison is performed and the comparison result ADD_CH is output to the self-powered time code word addition and subtraction unit to add and subtract the time code word. When the VCC voltage is lower than the self-powered reference voltage VCH_REF, ADD_CH=1, and the self-powered time code word DATA CH_TIME Increase one gear, otherwise decrease one gear;

[0059] The self-powered time code word conversion unit of the self-powered time control unit converts the self-powered time code word DATA CH_TIME Converted into the corresponding self-powered time voltage level V CH_TIME , whenever the self-powered time code word DATA CH_TIME Plus or minus one gear, self-powered time voltage level V CH_TIME Add or subtract a voltage step, corresponding to the self-powered time signal T CH Just add or subtract a fixed time width T CH_STEP The first voltage-controlled current source converts the feedback voltage FB into a current to charge the fifth capacitor C5. When the capacitor voltage V C5 Reaching the self-powered voltage level V CH_TIME When the self-power supply is stopped, the self-power supply control unit sends an instruction to turn off the second switch tube SW2 and turn on the first switch tube SW1 to end the current self-power supply.

[0060] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0061] The present invention provides an adaptive self-powered converter and an adaptive self-powered method. The adaptive self-powered converter includes a first switch tube, a second switch tube, a drive control circuit and an adaptive self-powered control circuit, wherein the adaptive self-powered control circuit includes a self-powered judgment unit, a self-powered time codeword calculation unit, a self-powered time control unit and a self-powered control unit. The adaptive self-powered method includes: detecting whether the VCC voltage drops to the stop self-powered voltage level through the self-powered judgment unit, outputting a self-powered judgment signal to control whether to start self-powered; adding and subtracting the self-powered time codeword according to the VCC voltage through the self-powered time codeword calculation unit, and transmitting the self-powered time codeword to the self-powered time control unit; controlling the self-powered time according to the self-powered time codeword through the self-powered time control unit; and controlling the first and second switch tubes according to the self-powered time and the self-powered judgment signal to realize adaptive self-powered. The present invention can dynamically adjust the self-powered time codeword according to the VCC voltage situation, and then adjust the self-powered time to realize adaptive self-powered. Its VCC voltage is not limited by input and output voltage, load and frequency, and can adjust the VCC voltage to the most suitable potential.

[0062] In addition, the present invention does not require additional devices, nor does it require a rectifier diode and a current-limiting resistor for an auxiliary winding, thereby effectively reducing system costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0064] Figure 1 A circuit diagram of an adaptive self-powered converter embodiment 1 provided by the present invention;

[0065] Figure 2 A working waveform diagram of the adaptive self-powered system provided by the present invention;

[0066] Figure 3 A schematic diagram of the structure of the adaptive self-powered control circuit provided by the present invention;

[0067] Figure 4 A schematic diagram of the structure of the self-powered judgment unit provided by the present invention;

[0068] Figure 5 A schematic diagram of the structure of a self-powered time code word calculation unit provided by the present invention;

[0069] Figure 6A schematic diagram of the structure of a self-powered time control unit embodiment 1 provided by the present invention;

[0070] Figure 7 A schematic diagram of the structure of a second embodiment of a self-powered time control unit provided by the present invention;

[0071] Figure 8 A working waveform diagram of the self-power supply time adaptively adjusted provided by the present invention;

[0072] Fig. 9 A circuit diagram of Embodiment 2 of the adaptive self-powered converter provided by the present invention;

[0073] Fig.10 A schematic diagram of the structure of a self-powered time control unit embodiment 3 provided by the present invention;

[0074] Fig.11 This is a schematic diagram of the structure of embodiment 4 of the self-powered time control unit provided by the present invention. DETAILED DESCRIPTION

[0075] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0076] The purpose of the present invention is to provide an adaptive self-powered converter and an adaptive self-powered method, which can automatically adjust the self-powered time of each time according to the power supply situation to make the power supply in the optimal state.

[0077] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0078] Figure 1 This is a circuit diagram of the adaptive self-powered converter embodiment 1 provided by the present invention. The present invention does not require components such as the rectifier diode and current limiting resistor of the auxiliary winding. The modules related to the adaptive self-powered in the primary controller 1 are mainly the drive control circuit and the adaptive self-powered control circuit. Figure 1 As shown, the present invention provides an adaptive self-powered converter, including: an input port, a first rectifier S1, a first capacitor C1, a transformer, a second rectifier S2, a second capacitor C2, an output port, a third capacitor C3, a primary side power switch tube Q1, detection resistors R1, R2 and a primary controller 1.

[0079] Among them, the input port is coupled to the AC voltage VAC; the first rectifier S1 is coupled to the input port to convert the AC voltage VAC into a DC voltage VIN; the first capacitor C1 is coupled to the first rectifier S1 to filter the DC voltage VIN output by the first rectifier S1; the second rectifier S2 is coupled to the second capacitor C2; the second capacitor C2 is coupled to the output port; the output port provides a DC voltage VO and a DC current IO to the load. The third capacitor C3 is coupled to the primary controller 1 to store and provide the energy required for the operation of the primary controller 1; the primary side power switch tube Q1 is coupled to the primary controller 1 and the first winding NP of the transformer; the transformer includes a first winding NP coupled to the first capacitor C1; a second winding NS coupled to the second capacitor C2 and the second rectifier S2; a third winding NA coupled to the detection resistors R1 and R2; the detection resistors R1 and R2 are coupled to the third winding NA of the transformer, and the common end is coupled to the primary controller 1. The primary controller 1 includes a first switch tube SW1, a second switch tube SW2, a drive control circuit, and an adaptive self-powered control circuit. Among them, the first switch tube SW1 is coupled to the adaptive self-power supply control circuit and the primary side power switch tube Q1 to control the direction of the current; the second switch tube SW2 is coupled to the adaptive self-power supply control circuit, the primary side power switch tube Q1 and the third capacitor C3 to charge the third capacitor C3.

[0080] Specifically, Figure 1As shown, one end of the first capacitor C1 is connected to the first rectifier S1, and the other end of the first capacitor C1 is grounded; one end of the first winding NP of the transformer is connected to one end of the first capacitor C1, and the other end of the first winding NP of the transformer is connected to the drain of the primary-side power switch tube Q1; one end of the second winding NS of the transformer is connected to the positive electrode of the second rectifier S2, and the negative electrode of the second rectifier S2 is connected to one end of the second capacitor C2; the other end of the second winding NS of the transformer is connected to the other end of the second capacitor C2; the second capacitor C2 is connected in parallel with the output port. One end of the third winding NA of the transformer is connected to one end of the detection resistor R1, and the other end of the third winding NA of the transformer is grounded; one end of the detection resistor R2 is connected to the other end of the detection resistor R1, and the other end of the detection resistor R2 is grounded; one end of the drive control circuit is connected to the gate of the primary side power switch tube Q1, and the other end of the drive control circuit is connected to the adaptive self-power supply control circuit; one end of the first switch tube SW1 is connected to the source of the primary side power switch tube Q1, and the other end of the first switch tube SW1 is connected to one end of the primary side current detection resistor R3, and the other end of the primary side current detection resistor R3 is grounded; the control ends of the first switch tube SW1 and the second switch tube SW2 are both connected to the adaptive self-power supply control circuit. One end of the second switch tube SW2 is connected to the source of the primary side power switch tube Q1, and the other end of the second switch tube SW2 is connected to one end of the third capacitor C3, one end of the third capacitor C3 is connected to the adaptive self-power supply control circuit, and the other end of the third capacitor C3 is grounded.

[0081] The driving control circuit in the adaptive self-powered converter provided by the present invention is coupled to the primary side power switch tube Q1 and the adaptive self-powered control circuit, and is used to turn on and off the primary side power switch tube Q1; the adaptive self-powered control circuit is used to control the opening and closing of the first switch tube SW1 and the second switch tube SW2 according to the size of the VCC voltage to adaptively control the power supply time.

[0082] Figure 2 The working waveform diagram of the adaptive self-powered operation provided by the present invention is as follows: Figure 2 As shown, FB is the feedback voltage, and OUT is the signal for the drive control circuit to control the primary side power switch Q1 to turn off. When the adaptive self-power supply control circuit detects that the VCC voltage is lower than the stop self-power supply voltage V STOP_REFAt t0~t1, the primary power switch tube Q1 is turned on. Under self-power supply, the first switch tube SW1 remains in the initial on state, and the second switch tube SW2 also remains in the initial off state. The main power circuit current IP flows through SW1 to the ground, and the magnitude of the current ICS flowing through the primary side current detection resistor R3 is basically equal to the magnitude of the main power circuit current IP. At t1~t2, self-power supply begins. At this time, SW1 is turned off, SW2 is turned on, and the current IP flows through SW2 to VCC. The magnitude of the VCC charging current IVCC is basically equal to the magnitude of the current IP until the self-power supply ends at t2. At t2~t3, SW1 is turned on again, and SW2 is turned off again. The current IP flows through the main power circuit, that is, through SW1 to the ground, until t4, when the current reaches the peak level and the primary power switch tube Q1 is turned off.

[0083] In order to provide driving energy for turning on the primary side power switch Q1, and because the initial loop current IP is relatively small, SW1 remains on and SW2 remains off. In addition, in order to ensure the peak current size, the peak current needs to be detected when Q1 is turned off. When self-powered, it is best to select the middle section when Q1 is turned on.

[0084] Since different loads and different input line voltages have different requirements for self-powering time, it is necessary to adaptively control the self-powering time.

[0085] Figure 3 The schematic diagram of the structure of the adaptive self-powered control circuit provided by the present invention is as follows: Figure 3 As shown, the adaptive self-powered control circuit of the present invention includes a self-powered judgment unit, a self-powered time code word calculation unit, a self-powered time control unit and a self-powered control unit. The self-powered judgment unit is used to detect and judge whether the VCC voltage drops to the stop self-powered voltage level V STOP_REF , and outputs a self-powered judgment signal CH_EN to the self-powered control unit to control whether to perform self-powered operation. A self-powered time code word calculation unit is used to calculate the addition and subtraction of the self-powered time code word according to the VCC voltage to output the self-powered time code word DATA CH_TIME To the self-powered time control unit. The self-powered time control unit is used to CH_TIME Generates a self-powered time signal T CH Control the self-power supply time; a self-power supply control unit is used to control the self-power supply time signal T CH The self-power supply judgment signal CH_EN controls the opening and closing of the first switch tube SW1 and the second switch tube SW2 to achieve adaptive self-power supply.

[0086] The following is a detailed description of each unit of the adaptive self-powered control circuit.

[0087] Figure 4 The schematic diagram of the structure of the self-powered judgment unit provided by the present invention is as follows: Figure 4 As shown, the self-powered judgment unit includes a first comparator A1; a first input terminal of the first comparator A1 is coupled to the VCC voltage, and a second input terminal of the first comparator A1 is coupled to the stop self-powered voltage V STOP_REF The output terminal of the first comparator A1 generates a self-power supply determination signal CH_EN, which is coupled to the input terminal of the self-power supply control unit.

[0088] Specifically, the first comparator A1 compares the VCC voltage with the stop self-power supply voltage V STOP_REF The self-power supply judgment signal CH_EN is generated by comparison, and the self-power supply judgment signal CH_EN is output to the self-power supply control unit to control whether the next PWM needs to turn on the self-power supply. STOP_REF When A1 outputs CH_EN=1, the next PWM starts the self-power supply, otherwise the self-power supply is not started.

[0089] Figure 5 The schematic diagram of the structure of the self-powered time code word calculation unit provided by the present invention is as follows: Figure 5 As shown, the self-powered time code word calculation unit includes a second comparator A2 and a self-powered time code word addition and subtraction unit; wherein the first input terminal of the second comparator A2 is coupled to the VCC voltage, and the second input terminal of the second comparator A2 is coupled to the self-powered reference voltage V CH_REF The output end of the second comparator A2 generates a comparison result ADD_CH, which is coupled to the input end of the self-powered time code word addition and subtraction unit; the output end of the self-powered time code word addition and subtraction unit generates a self-powered time code word DATA CH_TIME , coupled to the input terminal of the self-powered time control unit.

[0090] Specifically, the second comparator A2 compares the VCC voltage with the self-powered reference voltage V CH_REF Make a comparison, generate a comparison result ADD_CH, and output the comparison result ADD_CH to the self-powered time code word addition and subtraction unit to add and subtract the self-powered time code word. CH_REF When A2 outputs ADD_CH=1, the self-powered time code word increases by one level, otherwise it decreases by one level, and after addition and subtraction, the self-powered time code word DATA is output. CH_TIME To a self-powered time control unit.

[0091] Figure 6 This is a structural diagram of a self-powered time control unit embodiment 1 provided by the present invention, as shown in Figure 6As shown, in a specific embodiment, the self-powered time control unit includes a first current source I1, a fourth capacitor C4, a self-powered time code word conversion voltage unit and a third comparator A3; the output end of the first current source I1 is coupled to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is coupled to the ground; the input end of the self-powered time code word conversion voltage unit is coupled to the self-powered time code word DATA CH_TIME The output end of the self-powered time code word conversion unit generates a self-powered time voltage level V CH_TIME , coupled to the first input terminal of the third comparator A3; the second input terminal of the third comparator A3 is coupled to the first terminal of the fourth capacitor C4, and the output terminal of the third comparator A3 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

[0092] Specifically, the self-powered time code word conversion unit converts the self-powered time code word DATA CH_TIME Converted into the corresponding self-powered time voltage level V CH_TIME , generally the code word is plus or minus one level, V CH_TIME Add or subtract a voltage step, corresponding to the self-powered time T CH Just add or subtract a fixed time width T CH_STEP The first current source I1 charges the fourth capacitor C4. When the voltage V C4 Reaching the voltage level V representing the self-power supply time CH_TIME When the self-power supply is stopped, the self-power supply control unit sends an instruction to turn off SW2 and turn on SW1 again to end this self-power supply.

[0093] Therefore, based on the structure of the adaptive self-powered converter embodiment 1 and the self-powered time control unit embodiment 1 of the present invention, the present invention further provides an adaptive self-powered method, including:

[0094] The self-power supply determination unit compares the VCC voltage with the stop self-power supply voltage V STOP_REF When the VCC voltage is detected to be lower than the stop self-power supply voltage V STOP_REF When the self-power supply judgment unit outputs the self-power supply judgment signal CH_EN=1, controls the self-power supply control unit to start the self-power supply in the next PWM, otherwise the self-power supply is not started.

[0095] The self-powered time code word calculation unit converts the VCC voltage into a self-powered reference voltage V CH_REF The comparison is performed and the comparison result ADD_CH is output to the self-powered time code word addition and subtraction unit to add and subtract the time code word. When the VCC voltage is lower than the self-powered reference voltage V CH_REF When ADD_CH=1, the self-powered time code word DATA CH_TIME Increase one gear, otherwise decrease one gear.

[0096] The self-powered time code word conversion unit of the self-powered time control unit converts the self-powered time code word DATA CH_TIME Converted into the corresponding self-powered time voltage level V CH_TIME , whenever the self-powered time code word DATA CH_TIME Plus or minus one gear, self-powered time voltage level V CH_TIME Add or subtract a voltage step, corresponding to the self-powered time signal T CH Just add or subtract a fixed time width T CH_STEP The first current source I1 charges the fourth capacitor C4. When the capacitor voltage V C4 Reaching the self-powered voltage level V CH_TIME When the self-power supply is stopped, the self-power supply control unit sends an instruction to turn off the second switch tube SW2 and turn on the first switch tube SW1 to end the current self-power supply.

[0097] Figure 7 This is a structural diagram of a second embodiment of a self-powered time control unit provided by the present invention, as shown in FIG. Figure 7 As shown, in another specific embodiment, the self-powered time control unit of the present invention includes a second current source I2, a capacitor array, a self-powered time code word conversion voltage unit and a fourth comparator A4. The output end of the second current source I2 is coupled to the first end of the capacitor array, the second end of the capacitor array is coupled to the ground, and the third end of the capacitor array is coupled to the self-powered time code word DATA CH_TIME . Fixed self-powered time voltage level V CH_TIME , coupled to the first input terminal of the fourth comparator A4; the second input terminal of the fourth comparator A4 is coupled to the first terminal of the capacitor array, and the output terminal of the fourth comparator A4 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

[0098] Specifically, the difference between the self-powered time control unit embodiment 2 and embodiment 1 is that the self-powered time voltage level V CH_TIME Fixed, self-powered time code word DATA CH_TIME Select the number of capacitors in the capacitor array and change the capacitor size to change the self-powered time T CH , thereby achieving adaptive self-powering.

[0099] Based on the structure of the adaptive self-powered converter embodiment 1 and the self-powered time control unit embodiment 2 of the present invention, the present invention further provides an adaptive self-powered method, including:

[0100] The self-power supply determination unit compares the VCC voltage with the stop self-power supply voltage V STOP_REFWhen the VCC voltage is detected to be lower than the stop self-power supply voltage V STOP_REF When the self-power supply judgment unit outputs the self-power supply judgment signal CH_EN=1, controls the self-power supply control unit to start the self-power supply in the next PWM, otherwise the self-power supply is not started.

[0101] The self-powered time code word calculation unit converts the VCC voltage into a self-powered reference voltage V CH_REF The comparison is performed and the comparison result ADD_CH is output to the self-powered time code word addition and subtraction unit to add and subtract the time code word. When the VCC voltage is lower than the self-powered reference voltage VCH_REF, ADD_CH=1, and the self-powered time code word DATA CH_TIME Increase one gear, otherwise decrease one gear.

[0102] The self-powered time control unit maintains the self-powered time voltage level V CH_TIME Fixed, according to the self-powered time code word DATA CH_TIME Select the number of capacitors in the capacitor array to change the capacitor size, thereby changing the self-powered time signal T CH , thereby achieving adaptive self-powering.

[0103] Figure 8 The working waveform diagram of the self-powered time adaptive adjustment provided by the present invention is as follows: Figure 8 As shown in the figure, the key to self-adaptation lies in the adjustment of the self-power supply time. At time t1, the VCC voltage is higher than V STOP_REF Therefore, the next cycle does not perform self-power supply, SW1 is not turned off, SW2 is not turned on, the current IVCC flowing through the power supply loop is 0, and all currents pass through SW1 to the ground. At t2, the VCC voltage is lower than V STOP_REF , the next cycle starts self-power supply, SW1 is turned off at the beginning of self-power supply, SW2 is turned on, and the charging current IVCC is basically equal to the current IP. At the same time, because the voltage of VCC at time t2 is greater than the self-power supply reference voltage V CH_REF , self-powered time code word minus one, self-powered time voltage level V CH_TIME When the gear is lowered, the self-power supply time is reduced by a time width T CH_STEP At t3, the VCC voltage is still lower than V STOP_REF , the next cycle is still self-powered, but the voltage of VCC at time t3 is less than V CH_REF Therefore, the self-powered time code word increases by one, and the self-powered time voltage level V CH_TIME When the gear is raised, the self-power supply time is extended by a time width T CH_STEP In this way, by adding or subtracting the self-powered time codeword, the self-powered time increases or decreases by a time width T compared to the previous cycle. CH_STEP To achieve self-adaptive adjustment of self-power supply.

[0104] A fixed T CH_STEP Under different input line voltages, the charge to VCC is different, and the effect of charging VCC is also different. Therefore, a value reflecting the input voltage change can be introduced into the self-powered time control unit.

[0105] Fig. 9 Schematic diagram of the circuit of the adaptive self-powered converter embodiment 2 provided by the present invention. Fig. 9 As shown, in another specific embodiment, in order to better adjust the power supply time, a feedback input voltage FB is introduced into the adaptive self-powered control circuit to reduce the influence of the input voltage change on the VCC voltage change corresponding to the self-powered time code plus or minus one gear. In the adaptive self-powered converter embodiment 2, the adaptive self-powered control circuit also includes a self-powered judgment unit, a self-powered time code calculation unit, a self-powered time control unit and a self-powered control unit; and the difference between the adaptive self-powered converter embodiment 2 and embodiment 1 is that the feedback voltage FB reflecting the input voltage is input to the self-powered time control unit.

[0106] Fig.10 This is a schematic diagram of the structure of Embodiment 3 of the self-powered time control unit provided by the present invention, as shown in FIG. Fig.10 As shown, in a specific embodiment, the self-powered time control unit includes a first voltage-controlled current source, a fifth capacitor C5, a self-powered time code word conversion voltage unit and a fifth comparator A5; wherein the input end of the first voltage-controlled current source is coupled to the feedback voltage FB, the output end of the first voltage-controlled current source is coupled to the first end of the fifth capacitor C5, and the second end of the fifth capacitor C5 is coupled to the ground; the input end of the self-powered time code word conversion voltage unit is coupled to the self-powered time code word DATA CH_TIME The output end of the self-powered time code word conversion unit generates a self-powered time voltage level V CH_TIME , coupled to the first input terminal of the fifth comparator A5; the second input terminal of the fifth comparator A5 is coupled to the first terminal of the fifth capacitor C5, and the output terminal of the fifth comparator A5 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

[0107] Specifically, the first voltage-controlled current source converts the FB voltage reflecting the input voltage into a current to charge the fifth capacitor C5. C5 The voltage level V that represents the self-powering time is reached CH_TIME When the self-power supply is stopped, the self-power supply control unit sends a command to turn off SW2 and turn on SW1 again to end the self-power supply.

[0108] Based on the structure of the adaptive self-powered converter embodiment 2 and the self-powered time control unit embodiment 3 of the present invention, the present invention further provides an adaptive self-powered method, comprising:

[0109] The self-power supply determination unit compares the VCC voltage with the stop self-power supply voltage V STOP_REF When the VCC voltage is detected to be lower than the stop self-power supply voltage V STOP_REF When the self-power supply judgment unit outputs the self-power supply judgment signal CH_EN=1, controls the self-power supply control unit to start the self-power supply in the next PWM, otherwise the self-power supply is not started.

[0110] The self-powered time code word calculation unit converts the VCC voltage into a self-powered reference voltage V CH_REF The comparison is performed and the comparison result ADD_CH is output to the self-powered time code word addition and subtraction unit to add and subtract the time code word. When the VCC voltage is lower than the self-powered reference voltage VCH_REF, ADD_CH=1, and the self-powered time code word DATA CH_TIME Increase one gear, otherwise decrease one gear.

[0111] The self-powered time code word conversion unit of the self-powered time control unit converts the self-powered time code word DATA CH_TIME Converted into the corresponding self-powered time voltage level V CH_TIME , whenever the self-powered time code word DATA CH_TIME Plus or minus one gear, self-powered time voltage level V CH_TIME Add or subtract a voltage step, corresponding to the self-powered time signal T CH Just add or subtract a fixed time width T CH_STEP The first voltage-controlled current source converts the feedback voltage FB into a current to charge the fifth capacitor C5. When the capacitor voltage V C5 Reaching the self-powered voltage level V CH_TIME When the self-power supply is stopped, the self-power supply control unit sends an instruction to turn off the second switch tube SW2 and turn on the first switch tube SW1 to end the current self-power supply.

[0112] Fig.11 This is a structural diagram of a self-powered time control unit embodiment 4 provided by the present invention, as shown in Fig.11 As shown, in another specific embodiment, the self-powered time control unit includes a second voltage-controlled current source, a capacitor array, a self-powered time code word voltage conversion unit and a sixth comparator A6; the input end of the second voltage-controlled current source is coupled to the feedback voltage FB, the output end of the second voltage-controlled current source is coupled to the first end of the capacitor array, the second end of the capacitor array is coupled to the ground, and the third end of the capacitor array is coupled to the self-powered time code word DATA CH_TIME ; Fixed self-powered time voltage level V CH_TIME, coupled to the first input terminal of the sixth comparator A6; the second input terminal of the sixth comparator A6 is coupled to the first terminal of the capacitor array, and the output terminal of the sixth comparator A6 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

[0113] Specifically, the difference between the self-powered time control unit embodiment 4 of the present invention and embodiment 3 is that in the self-powered time control unit embodiment 4, V CH_TIME Fixed, self-powered time code word DATA CH_TIME Select the number of capacitors in the capacitor array and change the size of the capacitor to change the self-power supply time, thereby achieving adaptive self-power supply.

[0114] Based on the structure of the second embodiment of the adaptive self-powered converter and the fourth embodiment of the self-powered time control unit of the present invention, the present invention further provides an adaptive self-powered method, comprising:

[0115] The self-power supply determination unit compares the VCC voltage with the stop self-power supply voltage V STOP_REF When the VCC voltage is detected to be lower than the stop self-power supply voltage V STOP_REF When the self-power supply judgment unit outputs the self-power supply judgment signal CH_EN=1, controls the self-power supply control unit to start the self-power supply in the next PWM, otherwise the self-power supply is not started.

[0116] The self-powered time code word calculation unit converts the VCC voltage into a self-powered reference voltage V CH_REF The comparison is performed and the comparison result ADD_CH is output to the self-powered time code word addition and subtraction unit to add and subtract the time code word. When the VCC voltage is lower than the self-powered reference voltage VCH_REF, ADD_CH=1, and the self-powered time code word DATA CH_TIME Increase one gear, otherwise decrease one gear.

[0117] The self-powered time control unit maintains the self-powered time voltage level V CH_TIME Fixed, according to the self-powered time code word DATA CH_TIME Select the number of capacitors in the capacitor array to change the capacitor size, thereby changing the self-powered time signal T CH , thereby achieving adaptive self-power supply; the second voltage-controlled current source converts the feedback voltage FB into a current to charge the capacitor array. When the capacitor array reaches the self-power supply time voltage level V CH_TIME When the self-power supply is stopped, the self-power supply control unit sends an instruction to turn off the second switch tube SW2 and turn on the first switch tube SW1 to end the current self-power supply.

[0118] It can be seen that the adaptive self-powered converter and the adaptive self-powered method provided by the present invention can dynamically adjust the self-powered time codeword according to the VCC voltage condition, and then adjust the self-powered time to achieve adaptive self-powered, and its VCC voltage is not limited by input and output voltage, load and frequency, etc., and the VCC voltage is adjusted to the most suitable potential. In addition, the adaptive self-powered converter of the present invention does not need to add additional devices on the basis of the existing circuit, and does not need the rectifier diode and current limiting resistor of the auxiliary winding, thereby reducing the system cost.

[0119] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0120] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An adaptive self-powered converter, characterized in that: include: An input port, a first rectifier, a first capacitor, a transformer, a second rectifier, a second capacitor, an output port, a third capacitor, a primary-side power switch tube, a detection resistor, and a primary controller; The input port is coupled to an alternating current voltage VAC; The first rectifier S1 is coupled to the input port to convert the AC voltage VAC into a DC voltage VIN; The first capacitor C1 is coupled to the first rectifier S1 to filter the DC voltage VIN output by the first rectifier S1; The second rectifier S2 is coupled to a second capacitor C2; The second capacitor C2 is coupled to the output port; The output port provides a DC voltage VO and a DC current IO to the load; The third capacitor C3 is coupled to the primary controller to store and provide energy required for the primary controller to work; The primary side power switch tube Q1 is coupled to the primary controller and the first winding NP of the transformer; The transformer includes a first winding NP coupled to a first capacitor C1; a second winding NS coupled to a second capacitor C2 and a second rectifier S2; and a third winding NA coupled to detection resistors R1 and R2; The detection resistors R1 and R2 are coupled to the third winding NA of the transformer, and the common end is coupled to the primary controller; The primary controller includes a first switch tube SW1, a second switch tube SW2, a drive control circuit and an adaptive self-power supply control circuit; The first switch tube SW1 is coupled to the adaptive self-power supply control circuit and the primary side power switch tube Q1 to control the direction of the current; The second switch tube SW2 is coupled to the adaptive self-power supply control circuit, the primary side power switch tube Q1 and the third capacitor C3 to charge the third capacitor C3; The drive control circuit is coupled to the primary side power switch tube Q1 and the adaptive self-power supply control circuit; The adaptive self-power supply control circuit controls the opening and closing of the first switch tube SW1 and the second switch tube SW2 to adaptively control the power supply time; The adaptive self-powered control circuit comprises a self-powered judgment unit, a self-powered time codeword calculation unit, a self-powered time control unit and a self-powered control unit; The self-power supply determination unit is used to detect and determine whether the VCC voltage drops to the stop self-power supply voltage V STOP_REF , and output a self-powered judgment signal CH_EN; The self-powered time code word calculation unit is used to calculate the addition and subtraction of the self-powered time code word according to the VCC voltage to output the self-powered time code word DATA CH_TIME ; The self-powered time control unit is used to CH_TIME Generates a self-powered time signal T CH ; The self-powered control unit is used to CH The self-power supply judgment signal CH_EN controls the opening and closing of the first switch tube SW1 and the second switch tube SW2 to achieve adaptive self-power supply.

2. The adaptive self-powered converter according to claim 1, characterized in that: The self-powered judgment unit includes a first comparator A1; a first input terminal of the first comparator A1 is coupled to a VCC voltage, and a second input terminal of the first comparator A1 is coupled to a stop self-powered voltage V STOP_REF The output terminal of the first comparator A1 generates a self-power supply determination signal CH_EN, which is coupled to the input terminal of the self-power supply control unit.

3. The adaptive self-powered converter according to claim 2, characterized in that: The self-powered time code word calculation unit includes a second comparator A2 and a self-powered time code word addition and subtraction unit; The first input terminal of the second comparator A2 is coupled to the VCC voltage, and the second input terminal of the second comparator A2 is coupled to the self-powered reference voltage V CH_REF The output end of the second comparator A2 generates a comparison result ADD_CH, which is coupled to the input end of the self-powered time code word addition and subtraction unit; the output end of the self-powered time code word addition and subtraction unit generates a self-powered time code word DATA CH_TIME , coupled to the input terminal of the self-powered time control unit.

4. The adaptive self-powered converter according to claim 3, characterized in that: The self-powered time control unit includes a first current source I1, a fourth capacitor C4, a self-powered time code word conversion voltage unit and a third comparator A3; The output end of the first current source I1 is coupled to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is coupled to the ground; The input end of the self-powered time code word to voltage unit is coupled to the self-powered time code word DATA CH_TIME The output end of the self-powered time code word conversion voltage unit generates a self-powered time voltage level V CH_TIME , coupled to the first input terminal of the third comparator A3; The second input terminal of the third comparator A3 is coupled to the first terminal of the fourth capacitor C4. The output terminal of the third comparator A3 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

5. The adaptive self-powered converter according to claim 3, characterized in that: The self-powered time control unit includes a second current source I2, a capacitor array and a fourth comparator A4; The output end of the second current source I2 is coupled to the first end of the capacitor array, the second end of the capacitor array is coupled to the ground, and the third end of the capacitor array is coupled to the self-powered time code word DATA CH_TIME ; Fixed self-powered time voltage level V CH_TIME coupled to the first input terminal of the fourth comparator A4; the second input terminal of the fourth comparator A4 is coupled to the first terminal of the capacitor array, and the output terminal of the fourth comparator A4 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

6. The adaptive self-powered converter according to claim 3, characterized in that: The self-powered time control unit includes a first voltage-controlled current source, a fifth capacitor C5, a self-powered time code word conversion voltage unit and a fifth comparator A5; An input terminal of the first voltage-controlled current source is coupled to a feedback voltage FB, an output terminal of the first voltage-controlled current source is coupled to a first terminal of a fifth capacitor C5, and a second terminal of the fifth capacitor C5 is coupled to ground; The input end of the self-powered time code word to voltage unit is coupled to the self-powered time code word DATA CH_TIME The output end of the self-powered time code word conversion voltage unit generates a self-powered time voltage level V CH_TIME , coupled to the first input terminal of the fifth comparator A5; The second input terminal of the fifth comparator A5 is coupled to the first terminal of the fifth capacitor C5. The output terminal of the fifth comparator A5 generates a self-powered time signal T CH , coupled to the input terminal of the self-powered control unit.

7. The adaptive self-powered converter according to claim 3, characterized in that: The self-powered time control unit includes a second voltage-controlled current source, a capacitor array and a sixth comparator A6; The input end of the second voltage-controlled current source is coupled to the feedback voltage FB, the output end of the second voltage-controlled current source is coupled to the first end of the capacitor array, the second end of the capacitor array is coupled to the ground, and the third end of the capacitor array is coupled to the self-powered time code word DATA CH_TIME ; Fixed self-powered time voltage level V CH_TIME coupled to a first input terminal of the sixth comparator A6; The second input terminal of the sixth comparator A6 is coupled to the first terminal of the capacitor array. The output terminal of the sixth comparator A6 generates a self-powered time signal TCH, which is coupled to the input terminal of the self-powered control unit.

8. An adaptive self-powering method, characterized in that: Applied to the adaptive self-powered converter according to claim 1, the adaptive self-powered method comprises: The self-power supply determination unit compares the VCC voltage with the stop self-power supply voltage V STOP_REF When the VCC voltage is detected to be lower than the stop self-power supply voltage V STOP_REF When the self-power supply judgment unit outputs the self-power supply judgment signal CH_EN=1, controls the self-power supply control unit to start the self-power supply in the next PWM, otherwise the self-power supply is not started; The self-powered time code word calculation unit converts the VCC voltage into a self-powered reference voltage V CH_REF The comparison is performed and the comparison result ADD_CH is output to the self-powered time code word addition and subtraction unit to add and subtract the time code word. When the VCC voltage is lower than the self-powered reference voltage V CH_REF When ADD_CH=1, the self-powered time code word DATA CH_TIME Increase one gear, otherwise decrease one gear; The self-powered time code word conversion unit of the self-powered time control unit converts the self-powered time code word DATA CH_TIME Converted into the corresponding self-powered time voltage level V CH_TIME , whenever the self-powered time code word DATA CH_TIME Plus or minus one gear, self-powered time voltage level V CH_TIME Add or subtract a voltage step, corresponding to the self-powered time signal T CH Just add or subtract a fixed time width T CH_STEP The first current source I1 charges the fourth capacitor C4. When the capacitor voltage VC4 reaches the self-powered time voltage level V CH_TIME When the self-power supply is stopped, the self-power supply control unit sends an instruction to turn off the second switch tube SW2 and turn on the first switch tube SW1 to end the current self-power supply.

9. An adaptive self-powering method, characterized in that: Applied to the adaptive self-powered converter according to claim 1, the adaptive self-powered method comprises: The self-power supply determination unit compares the VCC voltage with the stop self-power supply voltage V STOP_REF When the VCC voltage is detected to be lower than the stop self-power supply voltage V STOP_REF When the self-power supply judgment unit outputs the self-power supply judgment signal CH_EN=1, controls the self-power supply control unit to start the self-power supply in the next PWM, otherwise the self-power supply is not started; The self-powered time code word calculation unit converts the VCC voltage into a self-powered reference voltage V CH_REF The comparison is performed and the comparison result ADD_CH is output to the self-powered time code word addition and subtraction unit to add and subtract the time code word. When the VCC voltage is lower than the self-powered reference voltage V CH_REF When ADD_CH=1, the self-powered time code word DATA CH_TIME Increase one gear, otherwise decrease one gear; The self-powered time control unit maintains the self-powered time voltage level V CH_TIME Fixed, according to the self-powered time code word DATA CH_TIME Select the number of capacitors in the capacitor array to change the capacitor size, thereby changing the self-powered time signal T CH , thereby achieving adaptive self-powering.

10. An adaptive self-powering method, characterized in that: Applied to the adaptive self-powered converter according to claim 1, the adaptive self-powered method comprises: The self-power supply determination unit compares the VCC voltage with the stop self-power supply voltage V STOP_REF When the VCC voltage is detected to be lower than the stop self-power supply voltage V STOP_REF When the self-power supply judgment unit outputs the self-power supply judgment signal CH_EN=1, controls the self-power supply control unit to start the self-power supply in the next PWM, otherwise the self-power supply is not started; The self-powered time code word calculation unit converts the VCC voltage into a self-powered reference voltage V CH_REF The comparison is performed and the comparison result ADD_CH is output to the self-powered time code word addition and subtraction unit to add and subtract the time code word. When the VCC voltage is lower than the self-powered reference voltage V CH_REF When ADD_CH=1, the self-powered time code word DATA CH_TIME Increase one gear, otherwise decrease one gear; The self-powered time code word conversion unit of the self-powered time control unit converts the self-powered time code word DATA CH_TIME Converted into the corresponding self-powered time voltage level V CH_TIME , whenever the self-powered time code word DATA CH_TIME Plus or minus one gear, self-powered time voltage level V CH_TIME Adding or subtracting a voltage step corresponds to adding or subtracting a fixed time width T corresponding to the self-powered time signal TCH. CH_STEP The first voltage-controlled current source converts the feedback voltage FB into a current to charge the fifth capacitor C5. When the capacitor voltage VC5 reaches the self-powered time voltage level V CH_TIME When the self-power supply is stopped, the self-power supply control unit sends an instruction to turn off the second switch tube SW2 and turn on the first switch tube SW1 to end the current self-power supply.

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