Isolated power supply circuit and control method based on transistor drive of mirror voltage source

Abstract

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 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 the two-way mirror voltage stabilizing circuit of the voltage stabilizing module, and is used 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.

Description

Technical Field

[0001] The present invention belongs to the field of isolated power supplies. More specifically, the present invention 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 and the increasing application of IGBTs and silicon carbide 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] Common flyback isolated drive power transformers use single-phase magnetization, resulting in low power output per unit volume. This is particularly challenging for low input voltages, such as 12V, 15V, or 24V primary voltages, where achieving a compact isolated power circuit with a load capacity of 4W, 6W, or even 10W is challenging.

[0004] Currently, there are isolated power supplies that use the UC2845 chip to implement voltage doubling and rectification, but their output power is also low at low input voltages. Therefore, there is an urgent need for an isolated 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 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 the two-way mirror voltage stabilizing circuit of the voltage stabilizing module, and is used 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.

[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 circuit driven by a transistor based on a mirror voltage source comprises:

[0007] Wave generating module, push-pull transformer module, isolation module and voltage stabilizing module;

[0008] The wave generating module is used to output two reverse periodic pulse waveforms to the push-pull transformer module;

[0009] The push-pull transformer module is configured to generate a target driving voltage according to the periodic pulse waveform and the input power supply voltage and the transformer turns ratio, and transmit the target driving voltage to the isolation module;

[0010] The isolation module is configured to output an isolated driving voltage according to the target driving voltage, and transmit the isolated driving voltage to the voltage stabilization module;

[0011] The voltage stabilizing module is used to output a power supply output voltage according to the isolation driving voltage.

[0012] In this solution, the wave generating module specifically includes:

[0013] 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;

[0014] The wave generating chip is SG3525 or SG2525;

[0015] A first end of the first resistor R1 is connected to the inverting 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;

[0016] 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;

[0017] A first end of the third resistor R3 is connected to the discharge pin DISCHARGE of the oscillator chip, and a second end of the third resistor R3 is connected to the oscillator capacitor pin CT of the oscillator chip;

[0018] A first end of the first capacitor C1 is connected to the oscillator capacitor pin CT of the oscillator chip, and a second end of the first capacitor C1 is connected to the ground level;

[0019] The first resistor R1 , the second resistor R2 and the third resistor R3 are all adjustable resistors.

[0020] In this solution, the push-pull transformer module specifically includes:

[0021] a first push-pull unit, a second push-pull unit, a transformer, a first rectifier unit, and a second rectifier unit;

[0022] 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;

[0023] The second push-pull unit is used to switch the input power supply on-state according to the second pulse output by the wave generating module to obtain a second push-pull voltage;

[0024] The transformer is configured 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;

[0025] The first rectifier unit is used to output a first target driving voltage according to the first transformed voltage;

[0026] The second rectifying unit is configured to output a second target driving voltage according to the second transformed voltage.

[0027] In this solution, the voltage stabilizing module specifically includes:

[0028] 2-way mirror voltage stabilization circuits, a first mirror voltage stabilization circuit and a second mirror voltage stabilization circuit;

[0029] The first mirror voltage stabilization circuit and the second mirror voltage stabilization circuit are arranged in a mirror image;

[0030] 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;

[0031] 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 transformation module.

[0032] In this solution, the isolation module is specifically:

[0033] An isolation drive circuit composed of an optocoupler chip, a capacitive coupling chip or a magnetic coupling chip;

[0034] The isolation driving circuit and the mirror voltage stabilization circuit are configured in a 1:1 ratio.

[0035] 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. The control method specifically includes:

[0036] Acquire first output voltage information and second output voltage information;

[0037] Obtaining first voltage information according to the first output voltage information and preset first turns ratio information;

[0038] Obtaining second voltage information according to the second output voltage information and preset second turns ratio information;

[0039] Calculating a difference between the first voltage information and the second voltage information to obtain first voltage deviation information;

[0040] determining first control variable information according to the first voltage deviation information;

[0041] adjusting first control amount information according to the first output voltage information and the second output voltage information;

[0042] adjusting the resistance value of the first resistor according to the first control quantity information;

[0043] obtaining first frequency information according to the first voltage information or the second voltage information;

[0044] The resistance value of the second resistor or the resistance value of the third resistor is adjusted according to the first frequency information.

[0045] In this solution, the first control amount information is determined according to the first voltage deviation information, specifically:

[0046] Obtaining first adjustment amount information according to the first voltage deviation information and a preset first control weight;

[0047] Obtaining second adjustment amount information according to the integral value of the first voltage deviation information and a preset second control weight;

[0048] Obtaining third adjustment amount information according to a differential value of the first voltage deviation information and a preset third control weight;

[0049] 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.

[0050] In this solution, adjusting the first control amount information according to the first output voltage information and the second output voltage information is specifically:

[0051] When it is determined that the first output voltage information is higher than the second output voltage information;

[0052] Determining whether the first control amount information is lower than a preset control amount lower limit;

[0053] If yes, adjusting the first control amount information according to the control amount lower limit;

[0054] When it is determined that the first output voltage information is lower than the second output voltage information;

[0055] Determining whether the first control amount information exceeds a preset control amount upper limit;

[0056] If so, the first control amount information is adjusted according to the control amount upper limit.

[0057] In this solution, the resistance value of the second resistor or the resistance value of the third resistor is adjusted according to the first frequency information, specifically:

[0058] When it is determined that the first frequency information is lower than a preset frequency range;

[0059] 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;

[0060] Determining whether the first frequency information exceeds the first frequency threshold;

[0061] If yes, increase the resistance of the second resistor;

[0062] If not, the resistance of the second resistor is lowered.

[0063] In this solution, the resistance value of the second resistor or the resistance value of the third resistor is adjusted according to the first frequency information, specifically:

[0064] When it is determined that the first frequency information is higher than a preset frequency range;

[0065] increasing 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;

[0066] Determining whether the first frequency information is lower than the second frequency threshold;

[0067] If yes, lower the resistance of the second resistor;

[0068] If not, the resistance of the second resistor is increased.

[0069] 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 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 the two-way mirror voltage stabilizing circuit of the voltage stabilizing module, and is used 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope.

[0071] Figure 1 A connection diagram of an isolated power supply circuit driven by a transistor based on a mirror voltage source is shown;

[0072] Figure 2 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 is shown;

[0073] Figure 3 A schematic diagram of circuit connections of a wave generating module provided in an embodiment of the present invention is shown;

[0074] Figure 4 A connection diagram of a push-pull transformer module provided by an embodiment of the present invention is shown;

[0075] Figure 5 A schematic diagram of a connection for an extended output provided by an embodiment of the present invention is shown;

[0076] Figure 6 A flow chart of a transistor-driven isolated power supply control method based on a mirror voltage source is shown;

[0077] Figure 7 A calculation flow chart of the first control amount information provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0078] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0079] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meaning 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 explicitly defined in this manner in the embodiments of the present invention.

[0080] The words "first", "second" and similar terms 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" do not indicate a quantity limitation, but rather indicate the existence of at least one. Similarly, words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" 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 do not necessarily have to be performed in exact order. On the contrary, the various steps may be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more steps may be removed from these processes.

[0081] Please refer to Figure 1 , Figure 1 A structural block diagram of the transistor-driven isolated power supply circuit based on a mirror voltage source provided by an embodiment of the present invention is shown;

[0082] like Figure 1 As shown, the first aspect of the present invention discloses the transistor-driven isolated power supply circuit based on the mirror voltage source, and the circuit includes:

[0083] Wave generating module 101, push-pull voltage transformation module 102, isolation module 103 and voltage stabilizing module 104;

[0084] The wave generating module 101 is used to output two reverse periodic pulse waveforms to the push-pull transformer module;

[0085] The push-pull transformer module 102 is configured to generate a target driving voltage according to the periodic pulse waveform and the input power voltage and the transformer turns ratio, and transmit the target driving voltage to the isolation module;

[0086] The isolation module 103 is configured to output an isolated driving voltage according to the target driving voltage, and transmit the isolated driving voltage to the voltage stabilization module;

[0087] The voltage stabilizing module 104 is configured to output a power supply output voltage according to the isolated driving voltage.

[0088] It should be noted that Figure 2 FIG. 1 shows a topology diagram of an isolated power supply circuit driven by a transistor based on a mirror voltage source according to an embodiment of the present invention. Figure 2As shown, the system includes a wave generator module, a push-pull transformer module, and a voltage regulator module. The wave generator module is based on the wave generator chip SG3525 or SG2525. The module, in conjunction with the peripheral circuitry of the wave generator chip, outputs a first pulse and a second pulse. Both the first and second pulses are periodic pulse waves, with the same frequency and opposite voltage levels. The push-pull transformer module includes two push-pull units, connected to the first and second pulses, respectively. These units transmit the input power voltage based on the pulse waveform to the transformer of the push-pull transformer module, which then generates the target drive voltage based on the corresponding turns ratio. The isolation module outputs an isolated drive voltage to the voltage regulator module based on the target drive voltage. This isolates the input power voltage of the push-pull transformer module from the isolated drive voltage of the voltage regulator module, improving the safety of the isolated power supply. The isolation module includes two mirrored voltage regulator circuits that generate the output voltage of the isolated power supply based on the isolated drive voltage, improving the load capacity of the isolated power supply.

[0089] 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.

[0090] According to an embodiment of the present invention, Figure 3 As shown, the wave generating module specifically includes:

[0091] 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;

[0092] The wave generating chip is SG3525 or SG2525;

[0093] A first end of the first resistor R1 is connected to the inverting 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;

[0094] 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;

[0095] A first end of the third resistor R3 is connected to the discharge pin DISCHARGE of the oscillator chip, and a second end of the third resistor R3 is connected to the oscillator capacitor pin CT of the oscillator chip;

[0096] A first end of the first capacitor C1 is connected to the oscillator capacitor pin CT of the oscillator chip, and a second end of the first capacitor C1 is connected to the ground level;

[0097] The first resistor R1 , the second resistor R2 and the third resistor R3 are all adjustable resistors.

[0098] 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 ripple chip; wherein, the input voltage value of the same-direction input pin serves as a comparison voltage and determines the duty cycle of the first pulse and the second pulse. When the resistance of the first resistor R1 is larger, the input voltage of the same-direction input pin is smaller, and at this time, the duty cycle of the first pulse is larger, and the duty cycle of the second pulse is smaller; when the resistance of the first resistor R1 is smaller, the input voltage of the same-direction input pin is larger, and at this time, the duty cycle of the first pulse is smaller, and the duty cycle of the second pulse is larger. The ripple 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:

[0099] ;

[0100] Where:

[0101] is the frequency value of the first pulse or the second pulse;

[0102] is the capacitance value of the first capacitor;

[0103] is the resistance value of the second resistor;

[0104] is the resistance value of the third resistor;

[0105] In practical applications, the frequencies 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.

[0106] 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.

[0107] According to an embodiment of the present invention, Figure 4 As shown, the push-pull transformer module specifically includes:

[0108] 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;

[0109] 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;

[0110] The second push-pull unit is used to switch the input power supply on-state according to the second pulse output by the wave generating module to obtain a second push-pull voltage;

[0111] The transformer is configured 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;

[0112] The first rectifier unit is used to output a first target driving voltage according to the first transformed voltage;

[0113] The second rectifying unit is configured to output a second target driving voltage according to the second transformed voltage.

[0114] It should be noted that the first and second push-pull units are positive temperature coefficient switching transistor circuits, typically employing high-power field-effect transistors. The conduction state of the switching transistors is switched according to the first and second pulses to generate the first and second push-pull voltages. Furthermore, the push-pull circuit isolates the power supply of the wave-generating module from the input power supply voltage. This means that the power supply of the wave-generating module and the input power supply of the push-pull transformer module are different. For example, the power supply voltage driving the wave-generating chip is 15V, while 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. A transformer is then used to generate the first and second transformed voltages according to a preset turns ratio. In practical applications, the turns ratios of the two paths are typically set to the same value, thereby ensuring that the first and second transformed voltages are the same. Finally, the first and second target drive voltages are output through a rectifier circuit.

[0115] According to an embodiment of the present invention, the voltage stabilizing module specifically includes:

[0116] 2-way mirror voltage stabilization circuits, a first mirror voltage stabilization circuit and a second mirror voltage stabilization circuit;

[0117] The first mirror voltage stabilization circuit and the second mirror voltage stabilization circuit are arranged in a mirror image;

[0118] 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;

[0119] 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 transformation module.

[0120] It should be noted that in this embodiment, a mirrored voltage stabilization circuit is used to receive the first target drive voltage and the second target drive voltage, respectively. The circuit then generates an output voltage based on the gain factor configured for the circuit, which serves as the output voltage of the isolated power supply. Because the two voltage stabilization circuits are mirrored, i.e., their gains are identical, they should output the same voltage when fed with the same target drive voltage.

[0121] According to an embodiment of the present invention, the isolation module is specifically:

[0122] An isolation drive circuit composed of an optocoupler chip, a capacitive coupling chip or a magnetic coupling chip;

[0123] The isolation driving circuit and the mirror voltage stabilization circuit are configured in a 1:1 ratio.

[0124] It should be noted that the isolation drive circuit, constructed using an optocoupler chip, a capacitive coupling chip, or a magnetic coupling chip, isolates the input power of the push-pull transformer module from the output power of the voltage regulator module. Furthermore, the isolation drive circuit and the mirror voltage regulator circuit are configured in a 1:1 ratio, ensuring that the output voltage of each voltage regulator circuit is isolated from the input power of the push-pull transformer module, thereby improving the reliability of the isolated power supply.

[0125] It is worth mentioning that it also includes:

[0126] Undervoltage protection module;

[0127] The output control terminal of the undervoltage protection module is connected to the lock pin SHUTDOWN of the wave generating chip;

[0128] The undervoltage protection module switches the output control terminal according to the input power voltage.

[0129] It should be noted that, as an implementation method, when the input power is too low, to prevent the voltage on the push-pull output side from being too low, which could cause the field-effect transistor to operate in the amplification region and generate excessive heat, potentially damaging the chip, this embodiment uses an undervoltage protection circuit to monitor the input power voltage in real time. When the input power voltage is too low, the SHUTDOWN pin of the oscillating chip is pulled low, halting the oscillating output and, in turn, the field-effect transistor's output.

[0130] Please refer to Figure 5 , Figure 5 A connection diagram of an extended output provided by an embodiment of the present invention is shown.

[0131] It is worth mentioning that Figure 5 As shown, it also includes:

[0132] First output expansion module 105;

[0133] The transformer of the first output expansion module is connected in parallel with the transformer of the push-pull transformer module;

[0134] The first output expansion module is connected in series with a group of isolation modules and voltage stabilization modules.

[0135] 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 pins 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 transistors meets the required power, two push-pull units can drive 2n isolated voltage-stabilizing circuits.

[0136] Please refer to Figure 6 , Figure 6 A flow chart of a transistor-driven isolated power supply control method based on a mirror voltage source is shown.

[0137] like Figure 6 As 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:

[0138] S602, obtaining first output voltage information and second output voltage information;

[0139] S604: Obtain first voltage information according to the first output voltage information and preset first turns ratio information;

[0140] S606, obtaining second voltage information according to the second output voltage information and preset second turns ratio information;

[0141] S608, calculating a difference between the first voltage information and the second voltage information to obtain first voltage deviation information;

[0142] S610, determining first control variable information according to the first voltage deviation information;

[0143] S612: Adjust first control variable information according to the first output voltage information and the second output voltage information;

[0144] S614, adjusting the resistance of the first resistor according to the first control variable information;

[0145] S616, obtaining first frequency information according to the first voltage information or the second voltage information;

[0146] S618: Adjust the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information.

[0147] It should be noted that the first output voltage information is the target drive voltage output by the first push-pull unit via the transformer; the second output voltage information is the target drive 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 or second voltage information, that is, the frequency of the first pulse or second pulse output by the oscillator chip.

[0148] In this embodiment, the resistance of the first resistor is adjusted in real time based on the difference between the first and second voltage information, thereby adjusting the duty cycle of the first and second pulses to balance the first and second output voltage information, thereby improving the reliability of the power supply output voltage. Furthermore, the first frequency information is adjusted in real time to ensure that the output voltage frequency meets the set frequency requirement, thereby improving the stability of the power supply output voltage. First, the first and second voltage information are calculated based on the first and second output voltage information according to the turns ratio of the transformer. The difference between the first and second voltage information is calculated to obtain first voltage deviation information. Then, according to a preset adjustment amount calculation rule, first control amount information is obtained to adjust the resistance of the first resistor, thereby adjusting the duty cycle of the first and second pulses to achieve the purpose of adjusting the first and second voltage information and balancing the first and second output voltage information. Then, based on the first or second voltage information, first frequency information is obtained. The resistance of the second resistor or the third resistor is adjusted in real time according to the output frequency relationship of the oscillating chip to stabilize the frequencies of the first and second pulses within a set range.

[0149] 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.

[0150] 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:

[0151] S702: Obtain first adjustment amount information according to the first voltage deviation information and a preset first control weight;

[0152] S704, obtaining second adjustment amount information according to the integral value of the first voltage deviation information and a preset second control weight;

[0153] S706, obtaining third adjustment amount information according to the differential value of the first voltage deviation information and a preset third control weight;

[0154] 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.

[0155] It should be noted that in this embodiment, the first control variable information is calculated using a feedback control adjustment variable calculation rule. First, the first control variable information, also known as the proportional adjustment variable, is obtained by multiplying the first voltage deviation information by a preset first control weight. Second, the integral value of the first voltage deviation information is calculated based on the first voltage deviation information. This is combined with a preset second control weight to obtain the second control variable information, also known as the integral adjustment variable. Third, the differential value of the first voltage deviation information is calculated based on the first voltage deviation information. This is combined with a preset third control weight to obtain the third control variable information, also known as the differential adjustment variable. Finally, the sum of the first, second, and third control variable information is calculated over a predetermined first time period to obtain the first control variable information, which is used to adjust the resistance of the first resistor. This embodiment performs real-time analysis of deviation changes across three dimensions: voltage deviation, integral, and differential, to obtain the first control variable information, improving the speed and stability of regulation.

[0156] 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:

[0157] When it is determined that the first output voltage information is higher than the second output voltage information;

[0158] Determining whether the first control amount information is lower than a preset control amount lower limit;

[0159] If yes, adjusting the first control amount information according to the control amount lower limit;

[0160] When it is determined that the first output voltage information is lower than the second output voltage information;

[0161] Determining whether the first control amount information exceeds a preset control amount upper limit;

[0162] If so, the first control amount information is adjusted according to the control amount upper limit.

[0163] It should be noted that, in this embodiment, the adjustment range of the control variable is set based on the first output voltage information and the second output voltage information. In one embodiment, when the first output voltage information is higher than the second output voltage information, it indicates that the duty cycle of the first pulse is too high, and the first output voltage information needs to be lowered by increasing the resistance value of the first resistor. In this case, it is determined whether the first control variable information is lower than a preset lower limit of the control variable. If so, it indicates that the resistance value is not adjusted upward, and therefore, the first control variable information is adjusted based on the lower limit of the control variable. In another embodiment, when the first output voltage information is lower than the second output voltage information, it indicates that the duty cycle of the first pulse is too low, and the first output voltage information needs to be lowered by decreasing the resistance value of the first resistor. In this case, it is determined whether the first control variable information is higher than a preset upper limit of the control variable. If so, it indicates that the resistance value is not adjusted downward, and therefore, the first control variable information is adjusted based on the upper limit of the control variable.

[0164] In the embodiment of the present invention, adjusting the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information is specifically:

[0165] When it is determined that the first frequency information is lower than a preset frequency range;

[0166] 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;

[0167] Determining whether the first frequency information exceeds the first frequency threshold;

[0168] If yes, increase the resistance of the second resistor;

[0169] If not, the resistance of the second resistor is lowered.

[0170] It should be noted that when the first frequency information is below a preset frequency range, the resistance of the second resistor or the third resistor needs to be adjusted downward according to the output frequency relationship of the wave generator chip, thereby increasing the first frequency information. In this embodiment, according to the output frequency relationship of the wave generator chip, coarse adjustment is first performed by adjusting the resistance of the third resistor downward until the first frequency information exceeds the preset first frequency threshold or the resistance of the third resistor reaches the lower resistance limit of the third resistor. Then, fine adjustment is performed by adjusting the resistance of the second resistor based on the relationship between the first frequency information and the first frequency threshold. Coarse adjustment improves adjustment speed, while fine adjustment improves adjustment accuracy.

[0171] In the embodiment of the present invention, adjusting the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information is specifically:

[0172] When it is determined that the first frequency information is higher than a preset frequency range;

[0173] increasing 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;

[0174] Determining whether the first frequency information is lower than the second frequency threshold;

[0175] If yes, lower the resistance of the second resistor;

[0176] If not, the resistance of the second resistor is increased.

[0177] It should be noted that when the first frequency information exceeds a preset frequency range, the resistance of the second resistor or the third resistor needs to be increased according to the output frequency relationship of the wave generator chip, thereby decreasing the first frequency information. In this embodiment, according to the output frequency relationship of the wave generator chip, coarse adjustment is first performed by increasing the resistance of the third resistor until the first frequency information falls below a preset second frequency threshold or the resistance of the third resistor reaches the upper limit of the third resistor. Then, fine adjustment is performed by adjusting the resistance of the second resistor based on the relationship between the first frequency information and the first frequency threshold. Coarse adjustment improves adjustment speed, while fine adjustment improves adjustment accuracy.

[0178] It is worth mentioning that it also includes:

[0179] When it is determined that the first frequency information is within a preset frequency range;

[0180] Obtaining a first frequency curve according to a linear fitting rule based on the first frequency information;

[0181] Obtaining first slope information according to the first frequency curve;

[0182] Determining whether the first slope information is lower than a preset first slope threshold;

[0183] If yes, lower the resistance of the second resistor;

[0184] Determining whether the first slope information is higher than a preset second slope threshold;

[0185] If so, increase the resistance of the second resistor.

[0186] It should be noted that, in this 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 the 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.

[0187] It is worth mentioning that it also includes:

[0188] obtaining a first voltage deviation sequence according to the first voltage deviation information;

[0189] Obtaining first voltage deviation mean information according to the first voltage deviation sequence;

[0190] Obtaining a first deviation value according to the first voltage deviation mean information and the first voltage deviation sequence;

[0191] Determining whether the first deviation value is greater than a preset first deviation threshold;

[0192] If so, then speed up the first time period;

[0193] Determining whether the first deviation value is less than a preset second deviation threshold;

[0194] If so, the first time period is slowed down.

[0195] It should be noted that in this embodiment, whether the first and second output voltage information are in a stable state is determined based on the deviation value of the first voltage deviation information. When the information is in a stable state, the calculation cycle of the first control variable can be slowed down to save computing power. When the information is in an unstable state, the calculation cycle of the first control variable can be accelerated to increase the frequency of adjusting the resistance of the first resistor, thereby ensuring that the first and second output voltage information are in a stable state. In this embodiment, first, the average value of a first voltage deviation sequence consisting 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 based on the sum of the absolute values of the differences between the first voltage deviation mean information and the first voltage deviation sequence. Finally, if the first deviation value is greater than a preset first deviation threshold, it indicates that the first and second output voltage information are in an unstable state. Therefore, the first time period needs to be accelerated to increase the adjustment frequency. If the first deviation value is less than a preset second deviation threshold, it indicates that the first and second output voltage information are in a stable state. Therefore, the first time period can be slowed down to save computing power.

[0196] 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 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 quantity according to a set adjustment quantity calculation rule based on the output voltage of the two-way mirror voltage stabilizing circuit of the voltage stabilizing module, and is used 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.

[0197] 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.

[0198] If the functions are implemented as software 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 portion that contributes to the prior art, or the portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes 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 various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0199] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for controlling an isolated power supply driven by a transistor based on a mirror voltage source, which is applied to an isolated power supply circuit driven by a transistor based on a mirror voltage source, wherein the circuit includes a wave generating module, a push-pull voltage conversion module, and a 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 configured to generate a target driving voltage according to the periodic pulse waveform and the input power supply voltage and the transformer turns ratio, and transmit the target driving voltage to the voltage stabilizing module; The voltage stabilizing module is used to output a power supply output voltage according to the target driving voltage; It is 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 variable 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; adjusting the resistance value of the first resistor according to the first control quantity information; obtaining first frequency information according to the first voltage information or the second voltage information; adjusting the resistance value of the second resistor or the resistance value of the third resistor according to the first frequency information; When it is determined that the first frequency information is within a preset frequency range; Obtaining a first frequency curve according to a linear fitting rule based on the first frequency information; 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, increase the resistance of the second resistor.

2. The isolated power supply control method based on a transistor drive of a mirror voltage source according to claim 1, wherein the determining of the first control amount information according to the first voltage deviation information is 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 a 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.

3. The isolated power supply control method based on transistor drive of a mirror voltage source according to claim 1, 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.

4. The isolated power supply control method based on transistor drive of a mirror voltage source according to claim 1, characterized in that: The step of adjusting the resistance value of the second resistor or 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, increase the resistance of the second resistor; If not, the resistance of the second resistor is lowered.

5. The isolated power supply control method based on transistor drive of a mirror voltage source according to claim 1, characterized in that: The step of adjusting the resistance value of the second resistor or 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; increasing 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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