Isolation power supply circuit driven by transistor based on mirror voltage source and control method

Abstract

The invention provides an isolated power supply circuit driven by a transistor based on a mirror voltage source, which outputs two paths of reverse periodic pulse waves through a wave sending module, generates a target driving voltage through a push-pull transformation module according to the periodic pulse waves, and outputs an isolated driving voltage through an isolation module according to the target driving voltage. The power supply output voltage is output through the voltage stabilizing module according to the isolation driving voltage, so that the power supply has relatively high loading capacity; in addition, the invention provides an isolation power supply control method driven by a transistor based on a mirror image voltage source, according to output voltages of two mirror image voltage stabilizing circuits of a voltage stabilizing module, a control quantity is obtained according to a set adjusting quantity calculation rule and is used for adjusting a first resistor of a wave sending module, so that the output voltages of the two mirror image voltage stabilizing circuits are balanced; and the frequency of the output voltage is stabilized by automatically adjusting a second resistor and a third resistor of the wave generating module, so that the reliability of the output voltage of the power supply is improved.

Description

Technical Field

[0001] The present invention belongs to the field of isolated power supplies, and more specifically, discloses an isolated power supply circuit and a control method driven by a transistor based on a mirror voltage source. Background Art

[0002] With the rapid development of the new energy industry, as more and more IGBTs and silicon carbide are used in power electronic equipment, the demand for high-reliability transistor isolation drivers in the system is also increasing. In addition, with the increase in switching frequency and the increase in transistor rated current, higher requirements are placed on the power of the drive power supply.

[0003] The common flyback isolation drive power transformer adopts single-phase magnetization, and the power output per unit volume of the circuit is relatively small. Especially for low input voltage, such as 12V, 15V, 24V primary voltage, it is difficult to make the isolated power circuit small and have a load capacity of 4W, 6W or even 10W.

[0004] At present, there is a voltage doubling rectifier isolation drive power supply using the UC2845 chip, but its output power is also low at low input voltage. Therefore, there is an urgent need for an isolation power supply technology with higher reliability and stronger load capacity. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide an isolated power supply circuit driven by a transistor based on a mirror voltage source, which outputs two reverse periodic pulse waves through a wave-generating module, generates a target driving voltage according to the periodic pulse waves through a push-pull transformer module, outputs an isolated driving voltage according to the target driving voltage through an isolation module, and outputs a power supply output voltage according to the isolated driving voltage through a voltage stabilizing module, so that the power supply has a strong load-carrying capacity; in addition, the present invention provides an isolated power supply control method driven by a transistor based on a mirror voltage source, according to the output voltage of the two-way mirror voltage stabilizing circuit of the voltage stabilizing module, a control amount is obtained according to a set adjustment amount calculation rule, and is used to adjust the first resistor of the wave-generating module, so as to balance the output voltage of the two-way mirror voltage stabilizing circuit; and the second resistor and the third resistor of the wave-generating module are automatically adjusted to achieve a stable output voltage frequency, thereby improving the reliability of the power supply output voltage.

[0006] In order to achieve the above-mentioned object, the first aspect of the present invention provides an isolated power supply circuit driven by a transistor based on a mirror voltage source, wherein the isolated power supply driven by a transistor based on a mirror voltage source comprises: Wave generating module, push-pull transformer module, isolation module and voltage stabilizing module; The wave generating module is used to output two reverse periodic pulse waveforms to the push-pull transformer module; The push-pull transformer module is used to generate a target driving voltage according to the periodic pulse waveform and the input power supply voltage according to the transformer turns ratio, and transmit the target driving voltage to the isolation module; The isolation module is used to output an isolation driving voltage according to the target driving voltage, and transmit the isolation driving voltage to the voltage stabilization module; The voltage stabilizing module is used to output a power supply output voltage according to the isolation driving voltage.

[0007] In this solution, the wave generating module specifically includes: The wave generating module at least includes: a wave generating chip, a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1; The wave-generating chip is SG3525 or SG2525; A first end of the first resistor R1 is connected to the same-direction input pin IN+ of the wave-generating chip, and a second end of the first resistor R1 is connected to the feedback voltage VREF pin of the wave-generating chip; A first end of the second resistor R2 is connected to the oscillator resistor pin RT of the wave-generating chip, and a second end of the second resistor R2 is connected to the ground level; The first end of the third resistor R3 is connected to the discharge pin DISCHARGE of the wave-generating chip, and the second end of the third resistor R3 is connected to the oscillator capacitor pin CT of the wave-generating chip; The first end of the first capacitor C1 is connected to the oscillator capacitor pin CT of the wave-generating chip, and the second end of the first capacitor C1 is connected to the ground level; The first resistor R1, the second resistor R2 and the third resistor R3 are all adjustable resistors.

[0008] In this solution, the push-pull transformer module specifically includes: A first push-pull unit, a second push-pull unit, a transformer, a first rectifying unit, and a second rectifying unit; The first push-pull unit is used to switch the input power supply conduction state according to the first pulse output by the wave generating module to obtain a first push-pull voltage; The second push-pull unit is used to switch the input power supply conduction state according to the second pulse output by the wave generating module to obtain a second push-pull voltage; The transformer is used to obtain a first transformed voltage according to a first push-pull voltage and a first turns ratio, and to obtain a second transformed voltage according to a second push-pull voltage and a second turns ratio; The first rectifying unit is used to output a first target driving voltage according to the first transformed voltage; The second rectifying unit is used for outputting a second target driving voltage according to the second transformed voltage.

[0009] In this solution, the voltage stabilizing module specifically includes: 2-way mirror voltage stabilization circuits, a first mirror voltage stabilization circuit and a second mirror voltage stabilization circuit; The first mirror voltage stabilization circuit and the second mirror voltage stabilization circuit are arranged in a mirror image; The first mirror voltage stabilization circuit generates a first power supply output voltage according to the first target driving voltage output by the push-pull voltage conversion module; The second mirror voltage stabilization circuit generates a second power supply output voltage according to the second target driving voltage output by the push-pull voltage conversion module.

[0010] In this solution, the isolation module is specifically: An isolation driving circuit composed of an optical coupling chip, a capacitive coupling chip or a magnetic coupling chip; The isolation driving circuit and the mirror voltage stabilization circuit are configured in a 1:1 ratio.

[0011] A second aspect of the present invention further provides a method for controlling an isolated power supply driven by a transistor based on a mirror voltage source, which is applied to any of the above-mentioned isolated power supply circuits driven by a transistor based on a mirror voltage source, and the control method specifically includes: Acquire first output voltage information and second output voltage information; Obtaining first voltage information according to the first output voltage information and preset first turns ratio information; Obtaining second voltage information according to the second output voltage information and preset second turns ratio information; Calculating a difference between the first voltage information and the second voltage information to obtain first voltage deviation information; Determining first control amount information according to the first voltage deviation information; adjusting first control amount information according to the first output voltage information and the second output voltage information; According to the first control amount information, adjusting the resistance value of the first resistor; obtaining first frequency information according to the first voltage information or the second voltage information; The resistance value of the second resistor or the resistance value of the third resistor is adjusted according to the first frequency information.

[0012] In this solution, the first control amount information is determined according to the first voltage deviation information, specifically: Obtaining first adjustment amount information according to the first voltage deviation information and a preset first control weight; Obtaining second adjustment amount information according to the integral value of the first voltage deviation information and a preset second control weight; Obtaining third adjustment amount information according to the differential value of the first voltage deviation information and a preset third control weight; According to a preset first time period, the sum of the first adjustment amount information, the second adjustment amount information and the third adjustment amount information is calculated to obtain the first control amount information.

[0013] In this solution, adjusting the first control amount information according to the first output voltage information and the second output voltage information is specifically: When it is determined that the first output voltage information is higher than the second output voltage information; Determining whether the first control amount information is lower than a preset control amount lower limit; If yes, adjusting the first control amount information according to the control amount lower limit; When it is determined that the first output voltage information is lower than the second output voltage information; Determining whether the first control amount information exceeds a preset control amount upper limit; If so, the first control amount information is adjusted according to the control amount upper limit value.

[0014] In this solution, the step of adjusting the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information is specifically as follows: When it is determined that the first frequency information is lower than a preset frequency range; Lowering the resistance of the third resistor until the first frequency information exceeds a preset first frequency threshold or the resistance of the third resistor reaches a lower resistance limit of the third resistor; Determining whether the first frequency information exceeds the first frequency threshold; If yes, then increase the resistance of the second resistor; If not, the resistance of the second resistor is lowered.

[0015] In this solution, the step of adjusting the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information is specifically as follows: When it is determined that the first frequency information is higher than a preset frequency range; Increase the resistance of the third resistor until the first frequency information is lower than a preset second frequency threshold or the resistance of the third resistor reaches an upper resistance limit of the third resistor; Determining whether the first frequency information is lower than the second frequency threshold; If yes, lower the resistance of the second resistor; If not, the resistance of the second resistor is increased.

[0016] The present invention provides an isolated power supply circuit driven by a transistor based on a mirror voltage source, which outputs two reverse periodic pulse waves through a wave-generating module, generates a target driving voltage according to the periodic pulse waves through a push-pull voltage transformation module, outputs an isolated driving voltage according to the target driving voltage through an isolation module, and outputs a power supply output voltage according to the isolated driving voltage through a voltage stabilizing module, so that the power supply has a strong load-carrying capacity; in addition, the present invention provides an isolated power supply control method driven by a transistor based on a mirror voltage source, which obtains a control amount according to a set adjustment amount calculation rule based on the output voltage of two-way mirror voltage stabilizing circuits of a voltage stabilizing module, and is used to adjust a first resistor of the wave-generating module, thereby balancing the output voltages of the two-way mirror voltage stabilizing circuits; and also achieves a stable output voltage frequency by automatically adjusting the second resistor and the third resistor of the wave-generating module, thereby improving the reliability of the power supply output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0018] Figure 1 A connection diagram of an isolated power supply circuit driven by a transistor based on a mirror voltage source is shown; Figure 2 A topological diagram of an isolated power supply circuit driven by a transistor based on a mirror voltage source provided by an embodiment of the present invention is shown; Figure 3 A schematic diagram of circuit connection of a wave generating module provided in an embodiment of the present invention is shown; Figure 4 A connection diagram of a push-pull transformer module provided by an embodiment of the present invention is shown; Figure 5 A connection diagram of an extended output provided by an embodiment of the present invention is shown; Figure 6 A flow chart of a transistor-driven isolated power supply control method based on a mirror voltage source is shown; Figure 7 A calculation flow chart of the first control amount information provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0019] 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.

[0020] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless the embodiments of the present invention are explicitly defined in this way.

[0021] The words "first", "second" and similar words used in the embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one", "an" or "the" and similar words do not indicate a quantity limitation, but indicate the existence of at least one. Similarly, words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps before or after the method of the embodiment of the present invention are not necessarily carried out in order. On the contrary, various steps can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or a step or several steps can be removed from these processes.

[0022] Please refer to Figure 1 , Figure 1 A structural block diagram of the transistor-driven isolation power supply circuit based on the mirror voltage source provided in an embodiment of the present invention is shown; like Figure 1 As shown, the first aspect of the present invention discloses the transistor-driven isolation power supply circuit based on the mirror voltage source, and the circuit includes: Wave generating module 101, push-pull voltage transformation module 102, isolation module 103 and voltage stabilizing module 104; The wave generating module 101 is used to output two reverse periodic pulse waveforms to the push-pull transformer module; The push-pull transformer module 102 is used to generate a target driving voltage according to the periodic pulse waveform and the input power supply voltage according to the transformer turns ratio, and transmit the target driving voltage to the isolation module; The isolation module 103 is used to output an isolation driving voltage according to the target driving voltage, and transmit the isolation driving voltage to the voltage stabilization module; The voltage stabilizing module 104 is used to output a power supply output voltage according to the isolation driving voltage.

[0023] It should be noted that Figure 2FIG. 1 shows a topology diagram of an isolated power supply circuit driven by a transistor based on a mirror voltage source provided by an embodiment of the present invention, such as Figure 2 As shown, it includes a wave-generating module, a push-pull transformer module and a voltage stabilizing module. The wave-generating module is based on the wave-generating chip SG3525 or SG2525, and then outputs the first pulse and the second pulse according to the peripheral circuit of the wave-generating chip; wherein the first pulse and the second pulse are both periodic pulse waves, and the waveforms of the first pulse and the second pulse have the characteristics of the same frequency and opposite levels. The push-pull transformer module includes two push-pull units, which are respectively connected to the first pulse and the second pulse; the push-pull unit transmits the input power supply voltage to the transformer of the push-pull transformer module according to the pulse waveform, and the transformer then generates the target driving voltage according to the corresponding turns ratio. The isolation module outputs the isolation driving voltage to the voltage stabilizing module according to the target driving voltage, so that the input power supply voltage of the push-pull transformer module is isolated from the isolation driving voltage of the voltage stabilizing module, thereby improving the safety of the isolated power supply. The isolation module includes two mirrored voltage stabilizing circuits, which generate the power output voltage of the isolated power supply according to the isolation driving voltage, thereby improving the load capacity of the isolated power supply.

[0024] Please refer to Figure 3 , Figure 3 A circuit connection diagram of a wave generating module provided in an embodiment of the present invention is shown.

[0025] According to an embodiment of the present invention, Figure 3 As shown, the wave generating module specifically includes: The wave generating module at least includes: a wave generating chip, a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1; The wave-generating chip is SG3525 or SG2525; A first end of the first resistor R1 is connected to the same-direction input pin IN+ of the wave-generating chip, and a second end of the first resistor R1 is connected to the feedback voltage VREF pin of the wave-generating chip; A first end of the second resistor R2 is connected to the oscillator resistor pin RT of the wave-generating chip, and a second end of the second resistor R2 is connected to the ground level; The first end of the third resistor R3 is connected to the discharge pin DISCHARGE of the wave-generating chip, and the second end of the third resistor R3 is connected to the oscillator capacitor pin CT of the wave-generating chip; The first end of the first capacitor C1 is connected to the oscillator capacitor pin CT of the wave-generating chip, and the second end of the first capacitor C1 is connected to the ground level; The first resistor R1, the second resistor R2 and the third resistor R3 are all adjustable resistors.

[0026] It should be noted that the resistance of the first resistor R1 determines the input voltage value of the same-direction input pin IN+ of the waving chip; wherein, the input voltage value of the same-direction input pin is used as a comparison voltage to determine the duty cycle of the first pulse and the second pulse. The larger the resistance of the first resistor R1, the smaller the input voltage of the same-direction input pin, at this time, the larger the duty cycle of the first pulse, and the smaller the duty cycle of the second pulse; the smaller the resistance of the first resistor R1, the larger the input voltage of the same-direction input pin, at this time, the smaller the duty cycle of the first pulse, and the larger the duty cycle of the second pulse. The waving chip, the second resistor R2, the third resistor R3 and the first capacitor C1 form a charge and discharge circuit to control the frequency of the first pulse and the second pulse. wherein, the output frequency is in the following relationship: ; Where: is the frequency value of the first pulse or the second pulse; is the capacitance value of the first capacitor; is the resistance value of the second resistor; is the resistance value of the third resistor; In practical applications, the frequency of the first pulse and the second pulse can be adjusted by adjusting the resistance values ​​of the second resistor R2 and the third resistor R3, thereby adjusting the frequency of the target driving voltage output by the transformer.

[0027] Please refer to Figure 4 , Figure 4 A connection diagram of a push-pull transformer module provided by an embodiment of the present invention is shown.

[0028] According to an embodiment of the present invention, Figure 4 As shown, the push-pull transformer module specifically includes: A first push-pull unit 301, a second push-pull unit 302, a transformer 303, a first rectifier unit 304, and a second rectifier unit 305; The first push-pull unit is used to switch the input power supply conduction state according to the first pulse output by the wave generating module to obtain a first push-pull voltage; The second push-pull unit is used to switch the input power supply conduction state according to the second pulse output by the wave generating module to obtain a second push-pull voltage; The transformer is used to obtain a first transformed voltage according to a first push-pull voltage and a first turns ratio, and to obtain a second transformed voltage according to a second push-pull voltage and a second turns ratio; The first rectifying unit is used to output a first target driving voltage according to the first transformed voltage; The second rectifying unit is used for outputting a second target driving voltage according to the second transformed voltage.

[0029] It should be noted that the first push-pull unit and the second push-pull unit are switch tube circuits with positive temperature coefficients, usually using high-power field effect tubes, and switching the conduction state of the switch tube according to the first pulse and the second pulse to obtain the first push-pull voltage and the second push-pull voltage. In addition, the power supply of the wave-generating module can be isolated from the input power supply voltage through the push-pull circuit, that is, the power supply of the wave-generating module and the input power supply of the push-pull transformer module are not the same power supply, that is, the power supply voltage of the driving wave-generating chip is 15V, and the input power supply voltage of the push-pull transformer module can be 10V, 12V, 15V, 18V, 24V, 32V, 48V, etc., thereby improving the load capacity of the isolation circuit. Then, through the transformer, the first transformation voltage and the second transformation voltage are obtained according to the preset turns ratio; wherein, in actual applications, the two turns ratios are usually set to the same value, so that the first transformation voltage is the same as the second transformation voltage. Finally, after passing through the rectifier circuit, the first target drive voltage and the second target drive voltage are output.

[0030] According to an embodiment of the present invention, the voltage stabilizing module specifically includes: 2-way mirror voltage stabilization circuits, a first mirror voltage stabilization circuit and a second mirror voltage stabilization circuit; The first mirror voltage stabilization circuit and the second mirror voltage stabilization circuit are arranged in a mirror image; The first mirror voltage stabilization circuit generates a first power supply output voltage according to the first target driving voltage output by the push-pull voltage conversion module; The second mirror voltage stabilization circuit generates a second power supply output voltage according to the second target driving voltage output by the push-pull voltage conversion module.

[0031] It should be noted that, in this embodiment, a mirrored voltage stabilization circuit is used to receive the first target driving voltage and the second target driving voltage respectively; then, according to the gain multiple set by the circuit, an output voltage is obtained as the output voltage of the isolated power supply. Since the two voltage stabilization circuits are mirrored, that is, their gain multiples are the same, therefore, when the same target driving voltage is used as the input voltage, the same voltage should be output.

[0032] According to an embodiment of the present invention, the isolation module is specifically: An isolation driving circuit composed of an optical coupling chip, a capacitive coupling chip or a magnetic coupling chip; The isolation driving circuit and the mirror voltage stabilization circuit are configured in a 1:1 ratio.

[0033] It should be noted that the isolation driving circuit composed of an optical coupling chip, a capacitive coupling chip or a magnetic coupling chip is used to isolate the input power supply of the push-pull transformer module from the output power supply of the voltage regulator module. In addition, the isolation driving circuit and the mirror voltage regulator circuit are configured in a 1:1 ratio, that is, to ensure that the output voltage of each voltage regulator circuit is isolated from the input power supply of the push-pull transformer module, so as to improve the reliability of the isolated power supply.

[0034] It is worth mentioning that it also includes: Undervoltage protection module; The output control end of the undervoltage protection module is connected to the lock pin SHUTDOWN of the wave-generating chip; The undervoltage protection module switches the output control terminal according to the input power supply voltage.

[0035] It should be noted that, as an implementation method, when the input power is too low, in order to avoid the voltage on the push-pull output side being too low due to the input power being too low, thereby causing the working state of the field effect tube to be in the amplification area, generating too much heat and burning the chip, this embodiment detects the voltage value of the input power in real time through the undervoltage protection circuit. When the voltage value of the input power is too low, the shutdown pin SHUTDOWN of the wave chip is pulled down to stop the wave output, thereby stopping the output of the field effect tube.

[0036] Please refer to Figure 5 , Figure 5 A connection diagram of an extended output provided by an embodiment of the present invention is shown.

[0037] It is worth mentioning that Figure 5 As shown, it also includes: First output expansion module 105; The transformer of the first output expansion module is connected in parallel with the transformer of the push-pull transformer module; The first output expansion module is connected in series with a group of isolation modules and voltage stabilization modules.

[0038] It should be noted that the first output expansion module includes a second transformer 501, a third rectifier circuit 502 and a fourth rectifier circuit 503. The second transformer is connected in parallel to the output pin of the push-pull unit of the push-pull transformer module, thereby achieving the effect of two push-pull units driving four isolated voltage stabilizing circuits. Similarly, when the output power of the field effect tube meets the demand, two push-pull units can drive 2n isolated voltage stabilizing circuits.

[0039] Please refer to Figure 6 , Figure 6 A flow chart of an isolated power supply control method based on transistor driving of a mirror voltage source is shown.

[0040] like Figure 6As shown, the second aspect of the present invention discloses a control method for an isolated power supply driven by a transistor based on a mirror voltage source, and the control method specifically includes: S602, obtaining first output voltage information and second output voltage information; S604, obtaining first voltage information according to the first output voltage information and preset first turns ratio information; S606, obtaining second voltage information according to the second output voltage information and preset second turns ratio information; S608, calculating a difference between the first voltage information and the second voltage information to obtain first voltage deviation information; S610, determining first control amount information according to the first voltage deviation information; S612, adjusting first control amount information according to the first output voltage information and the second output voltage information; S614, adjusting the resistance value of the first resistor according to the first control amount information; S616, obtaining first frequency information according to the first voltage information or the second voltage information; S618: Adjust the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information.

[0041] It should be noted that the first output voltage information is the target driving voltage output by the first push-pull unit via the transformer; the second output voltage information is the target driving voltage output by the second push-pull unit via the transformer. The first voltage information is the voltage transmitted by the first push-pull unit to the transformer; the second voltage information is the voltage transmitted by the second push-pull unit to the transformer. The first frequency information is the frequency of the first voltage information or the second voltage information, that is, the frequency of the first pulse or the second pulse output by the wave chip.

[0042] In this embodiment, according to the difference between the first voltage information and the second voltage information, the resistance of the first resistor is adjusted in real time, thereby adjusting the duty cycle of the first pulse and the second pulse, so as to balance the first output voltage information and the second output voltage information, thereby improving the reliability of the output voltage of the power supply. In addition, the first frequency information is also adjusted in real time so that the frequency of the output voltage meets the set frequency requirement, thereby improving the stability of the output voltage of the power supply. First, according to the turns ratio of the transformer, the first voltage information and the second voltage information are calculated according to the first output voltage information and the second output voltage information. The difference between the first voltage information and the second voltage information is calculated to obtain the first voltage deviation information; then the first control amount information is obtained according to the preset adjustment amount calculation rule to adjust the resistance of the first resistor, and then adjust the duty cycle of the first pulse and the second pulse, so as to adjust the first voltage information and the second voltage information, and achieve the purpose of balancing the first output voltage information and the second output voltage information. Then, according to the first voltage information or the second voltage information, the first frequency information is obtained, and according to the output frequency relationship of the wave chip, the resistance of the second resistor or the resistance of the third resistor is adjusted in real time so that the frequency of the first pulse and the second pulse is stabilized within the set range.

[0043] Please refer to Figure 7 , Figure 7 A calculation flow chart of the first control amount information provided by an embodiment of the present invention is shown.

[0044] In the embodiment of the present invention, Figure 7 As shown, the first control amount information is determined according to the first voltage deviation information, specifically: S702, obtaining first adjustment amount information according to the first voltage deviation information and a preset first control weight; S704, obtaining second adjustment amount information according to the integral value of the first voltage deviation information and a preset second control weight; S706, obtaining third adjustment amount information according to the differential value of the first voltage deviation information and a preset third control weight; S708: Calculate the sum of the first adjustment amount information, the second adjustment amount information and the third adjustment amount information according to a preset first time period to obtain the first control amount information.

[0045] It should be noted that, in this embodiment, the feedback control adjustment amount calculation rule is adopted to calculate the first control amount information. First, the first adjustment amount information is obtained according to the product of the first voltage deviation information and the preset first control weight, also known as the proportional adjustment amount. Secondly, the integral value of the first voltage deviation information is calculated according to the first voltage deviation information, and then the second adjustment amount information is calculated in combination with the preset second control weight, also known as the integral adjustment amount. Then, the differential value of the first voltage deviation information is calculated according to the first voltage deviation information, and then the third adjustment amount information is calculated in combination with the preset third control weight, also known as the differential adjustment amount. Finally, according to the set first time period, the sum of the first adjustment amount information, the second adjustment amount information and the third adjustment amount information is calculated to obtain the first control amount information, which is used to adjust the resistance value of the first resistor. In this embodiment, the change of the deviation value is analyzed in real time from three dimensions, namely, the voltage deviation value, the integral value of the voltage deviation value and the differential value of the voltage deviation value, so as to obtain the first control amount information and improve the speed and stability of the adjustment.

[0046] In the embodiment of the present invention, adjusting the first control amount information according to the first output voltage information and the second output voltage information is specifically: When it is determined that the first output voltage information is higher than the second output voltage information; Determining whether the first control amount information is lower than a preset control amount lower limit; If yes, adjusting the first control amount information according to the control amount lower limit; When it is determined that the first output voltage information is lower than the second output voltage information; Determining whether the first control amount information exceeds a preset control amount upper limit; If so, the first control amount information is adjusted according to the control amount upper limit value.

[0047] It should be noted that, in this embodiment, the adjustment range of the control amount is set according to the first output voltage information and the second output voltage information. As an implementation mode, when the first output voltage information is higher than the second output voltage information, it means that the duty cycle of the first pulse is too high, and it is necessary to reduce the first output voltage information by increasing the resistance value of the first resistor; at this time, it is determined whether the first control amount information is lower than the preset control amount lower limit value, and if so, it means that the resistance value is not adjusted enough, so the first control amount information is adjusted according to the control amount lower limit value. As another implementation mode, when the first output voltage information is lower than the second output voltage information, it means that the duty cycle of the first pulse is too low, and it is necessary to reduce the first output voltage information by decreasing the resistance value of the first resistor; at this time, it is determined whether the first control amount information is higher than the preset control amount upper limit value, and if so, it means that the resistance value is not adjusted enough, so the first control amount information is adjusted according to the control amount upper limit value.

[0048] In the embodiment of the present invention, the step of adjusting the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information is specifically: When it is determined that the first frequency information is lower than a preset frequency range; Lowering the resistance of the third resistor until the first frequency information exceeds a preset first frequency threshold or the resistance of the third resistor reaches a lower resistance limit of the third resistor; Determining whether the first frequency information exceeds the first frequency threshold; If yes, then increase the resistance of the second resistor; If not, the resistance of the second resistor is lowered.

[0049] It should be noted that when the first frequency information is lower than the preset frequency range, according to the output frequency relationship of the wave-generating chip, it is necessary to lower the resistance value of the second resistor or the resistance value of the third resistor, so as to increase the first frequency information. In this embodiment, according to the output frequency relationship of the wave-generating chip, first, coarse adjustment is achieved by lowering the resistance value of the third resistor until the first frequency information exceeds the preset first frequency threshold or the resistance value of the third resistor reaches the lower limit value of the resistance value of the third resistor; then, according to the magnitude relationship between the first frequency information and the first frequency threshold, the resistance value of the second resistor is finely adjusted. Among them, coarse adjustment is used to increase the speed of adjustment, and fine adjustment is used to increase the accuracy of adjustment.

[0050] In the embodiment of the present invention, the step of adjusting the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information is specifically: When it is determined that the first frequency information is higher than a preset frequency range; Increase the resistance of the third resistor until the first frequency information is lower than a preset second frequency threshold or the resistance of the third resistor reaches an upper resistance limit of the third resistor; Determining whether the first frequency information is lower than the second frequency threshold; If yes, lower the resistance of the second resistor; If not, the resistance of the second resistor is increased.

[0051] It should be noted that when the first frequency information is higher than the preset frequency range, according to the output frequency relationship of the wave-generating chip, the resistance value of the second resistor or the resistance value of the third resistor needs to be increased, thereby reducing the first frequency information. In this embodiment, according to the output frequency relationship of the wave-generating chip, first, coarse adjustment is achieved by increasing the resistance value of the third resistor until the first frequency information is lower than the preset second frequency threshold or the resistance value of the third resistor reaches the upper limit of the resistance value of the third resistor; then, according to the magnitude relationship between the first frequency information and the first frequency threshold, the resistance value of the second resistor is finely adjusted. Among them, coarse adjustment is used to increase the speed of adjustment, and fine adjustment is used to increase the accuracy of adjustment.

[0052] It is worth mentioning that it also includes: When it is determined that the first frequency information is within a preset frequency range; According to the first frequency information and a linear fitting rule, a first frequency curve is obtained; Obtaining first slope information according to the first frequency curve; Determining whether the first slope information is lower than a preset first slope threshold; If yes, lower the resistance of the second resistor; Determining whether the first slope information is higher than a preset second slope threshold; If so, the resistance of the second resistor is increased.

[0053] It should be noted that, in the present embodiment, when the first frequency information is within a preset frequency range, a curve is fitted according to the first frequency information to obtain a change trend of the first frequency; fine-tuning is achieved by adjusting the resistance value of the second resistor according to the change trend, further ensuring that the first frequency information is stable within a preset frequency range. First, according to linear fitting rules, including linear fitting, least squares fitting, etc., a first frequency curve is obtained. Then, according to the first frequency curve, the first slope information is obtained. When the first slope information is lower than the preset first slope threshold, it indicates that the downward trend of the first frequency curve is large. At this time, the downward trend of the first frequency curve is slowed down by lowering the resistance value of the second resistor. When the first slope information is higher than the preset second slope threshold, it indicates that the upward trend of the first frequency curve is large. At this time, the upward trend of the first frequency curve is slowed down by increasing the resistance value of the second resistor.

[0054] It is worth mentioning that it also includes: Obtaining a first voltage deviation sequence according to the first voltage deviation information; Obtaining first voltage deviation mean information according to the first voltage deviation sequence; Obtaining a first deviation value according to the first voltage deviation mean information and the first voltage deviation sequence; Determining whether the first deviation value is greater than a preset first deviation threshold; If so, speed up the first time period; Determining whether the first deviation value is less than a preset second deviation threshold; If so, the first time period is slowed down.

[0055] It should be noted that, in this embodiment, according to the deviation value of the first voltage deviation information, it is determined whether the first output voltage information and the second output voltage information are in a stable state. When in a stable state, the calculation cycle of the first control amount can be slowed down to save computing power; when in an unstable state, the calculation cycle of the first control amount can be accelerated to increase the frequency of adjusting the resistance of the first resistor, so that the first output voltage information and the second output voltage information are in a stable state. In this embodiment, first, the average value of the first voltage deviation sequence composed of a plurality of first voltage deviation information is calculated to obtain the first voltage deviation mean information. Then, the first deviation value is calculated according to the sum of the absolute values ​​of the difference between the first voltage deviation mean information and the first voltage deviation sequence. Finally, if the first deviation value is greater than the preset first deviation threshold, it means that the first output voltage information and the second output voltage information are in an unstable state, therefore, it is necessary to speed up the first time period to increase the adjustment frequency; if the first deviation value is less than the preset second deviation threshold, it means that the first output voltage information and the second output voltage information are in a stable state, therefore, the first time period can be slowed down to save computing power.

[0056] In summary, the present invention provides an isolated power supply circuit driven by a transistor based on a mirror voltage source, which outputs two reverse periodic pulse waves through a wave-generating module, generates a target driving voltage according to the periodic pulse waves through a push-pull transformer module, outputs an isolated driving voltage according to the target driving voltage through an isolation module, and outputs a power supply output voltage according to the isolated driving voltage through a voltage stabilizing module, so that the power supply has a strong load-carrying capacity; in addition, the present invention provides an isolated power supply control method driven by a transistor based on a mirror voltage source, and obtains a control amount according to a set adjustment amount calculation rule according to the output voltage of the two-way mirror voltage stabilizing circuit of the voltage stabilizing module, so as to adjust the first resistor of the wave-generating module, thereby balancing the output voltage of the two-way mirror voltage stabilizing circuit; and also achieves a stable output voltage frequency by automatically adjusting the second resistor and the third resistor of the wave-generating module, thereby improving the reliability of the power supply output voltage.

[0057] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0058] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An isolated power supply circuit driven by a transistor based on a mirror voltage source, characterized in that: The transistor-driven isolated power supply circuit based on the mirror voltage source comprises: Wave generating module, push-pull transformer module, isolation module and voltage stabilizing module; The wave generating module is used to output two reverse periodic pulse waveforms to the push-pull transformer module; The push-pull transformer module is used to generate a target driving voltage according to the periodic pulse waveform and the input power supply voltage according to the transformer turns ratio, and transmit the target driving voltage to the isolation module; The isolation module is used to output an isolation driving voltage according to the target driving voltage, and transmit the isolation driving voltage to the voltage stabilization module; The voltage stabilizing module is used to output a power supply output voltage according to the isolation driving voltage.

2. The transistor-driven isolated power supply circuit based on a mirror voltage source according to claim 1, characterized in that: The wave generating module specifically comprises: The wave generating module at least includes: a wave generating chip, a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C1; The wave-generating chip is SG3525 or SG2525; A first end of the first resistor R1 is connected to the same-direction input pin IN+ of the wave-generating chip, and a second end of the first resistor R1 is connected to the feedback voltage VREF pin of the wave-generating chip; A first end of the second resistor R2 is connected to the oscillator resistor pin RT of the wave-generating chip, and a second end of the second resistor R2 is connected to the ground level; The first end of the third resistor R3 is connected to the discharge pin DISCHARGE of the wave-generating chip, and the second end of the third resistor R3 is connected to the oscillator capacitor pin CT of the wave-generating chip; The first end of the first capacitor C1 is connected to the oscillator capacitor pin CT of the wave-generating chip, and the second end of the first capacitor C1 is connected to the ground level; The first resistor R1, the second resistor R2 and the third resistor R3 are all adjustable resistors.

3. The transistor-driven isolated power supply circuit based on a mirror voltage source according to claim 1, characterized in that: The push-pull transformer module specifically includes: A first push-pull unit, a second push-pull unit, a transformer, a first rectifying unit, and a second rectifying unit; The first push-pull unit is used to switch the input power supply conduction state according to the first pulse output by the wave generating module to obtain a first push-pull voltage; The second push-pull unit is used to switch the input power supply conduction state according to the second pulse output by the wave generating module to obtain a second push-pull voltage; The transformer is used to obtain a first transformed voltage according to a first push-pull voltage and a first turns ratio, and to obtain a second transformed voltage according to a second push-pull voltage and a second turns ratio; The first rectifying unit is used to output a first target driving voltage according to the first transformed voltage; The second rectifying unit is used for outputting a second target driving voltage according to the second transformed voltage.

4. The transistor-driven isolated power supply circuit based on a mirror voltage source according to claim 1, characterized in that: The voltage stabilizing module specifically includes: 2-way mirror voltage stabilization circuits, a first mirror voltage stabilization circuit and a second mirror voltage stabilization circuit; The first mirror voltage stabilization circuit and the second mirror voltage stabilization circuit are arranged in a mirror image; The first mirror voltage stabilization circuit generates a first power supply output voltage according to the first target driving voltage output by the push-pull voltage conversion module; The second mirror voltage stabilization circuit generates a second power supply output voltage according to the second target driving voltage output by the push-pull voltage conversion module.

5. The transistor-driven isolated power supply circuit based on a mirror voltage source according to claim 4, characterized in that: The isolation module is specifically: An isolation driving circuit composed of an optical coupling chip, a capacitive coupling chip or a magnetic coupling chip; The isolation driving circuit and the mirror voltage stabilization circuit are configured in a 1:1 ratio.

6. A method for controlling an isolated power supply driven by a transistor based on a mirror voltage source, applied to the isolated power supply circuit driven by a transistor based on a mirror voltage source as claimed in any one of claims 1 to 5, characterized in that: The control method specifically includes: Acquire first output voltage information and second output voltage information; Obtaining first voltage information according to the first output voltage information and preset first turns ratio information; Obtaining second voltage information according to the second output voltage information and preset second turns ratio information; Calculating a difference between the first voltage information and the second voltage information to obtain first voltage deviation information; Determining first control amount information according to the first voltage deviation information; adjusting first control amount information according to the first output voltage information and the second output voltage information; According to the first control amount information, adjusting the resistance value of the first resistor; obtaining first frequency information according to the first voltage information or the second voltage information; The resistance value of the second resistor or the resistance value of the third resistor is adjusted according to the first frequency information.

7. The isolated power supply control method based on transistor drive of a mirror voltage source according to claim 6, wherein the first control amount information is determined according to the first voltage deviation information, specifically: Obtaining first adjustment amount information according to the first voltage deviation information and a preset first control weight; Obtaining second adjustment amount information according to the integral value of the first voltage deviation information and a preset second control weight; Obtaining third adjustment amount information according to the differential value of the first voltage deviation information and a preset third control weight; According to a preset first time period, the sum of the first adjustment amount information, the second adjustment amount information and the third adjustment amount information is calculated to obtain the first control amount information.

8. The isolated power supply control method based on transistor drive of a mirror voltage source according to claim 6, characterized in that: The adjusting the first control amount information according to the first output voltage information and the second output voltage information is specifically: When it is determined that the first output voltage information is higher than the second output voltage information; Determining whether the first control amount information is lower than a preset control amount lower limit; If yes, adjusting the first control amount information according to the control amount lower limit; When it is determined that the first output voltage information is lower than the second output voltage information; Determining whether the first control amount information exceeds a preset control amount upper limit; If so, the first control amount information is adjusted according to the control amount upper limit value.

9. The isolated power supply control method based on transistor drive of a mirror voltage source according to claim 6, characterized in that: The step of adjusting the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information is specifically as follows: When it is determined that the first frequency information is lower than a preset frequency range; Lowering the resistance of the third resistor until the first frequency information exceeds a preset first frequency threshold or the resistance of the third resistor reaches a lower resistance limit of the third resistor; Determining whether the first frequency information exceeds the first frequency threshold; If yes, then increase the resistance of the second resistor; If not, the resistance of the second resistor is lowered.

10. The isolated power supply control method based on transistor drive of a mirror voltage source according to claim 6, characterized in that: The step of adjusting the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information is specifically as follows: When it is determined that the first frequency information is higher than a preset frequency range; Increase the resistance of the third resistor until the first frequency information is lower than a preset second frequency threshold or the resistance of the third resistor reaches an upper resistance limit of the third resistor; Determining whether the first frequency information is lower than the second frequency threshold; If yes, lower the resistance of the second resistor; If not, the resistance of the second resistor is increased.

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