A switching power supply and an electronic device

Abstract

The present invention discloses a switching power supply and an electronic device. The switching power supply includes a power front-end module, an adjustment module, an energy storage module, and at least one load starting module. The power front-end module is used for boosting the input alternating current and outputting a first supply voltage and a second supply voltage to the load. The adjustment module is respectively connected to the power front-end module and the load starting module, and is used for boosting the second supply voltage to a preset voltage value by increasing the voltage value of the first supply voltage, and further boosting the second supply voltage by a preset value according to the boosting signal output by the load starting module. The load starting module is respectively connected to the adjustment module and the power front-end module, and is used for outputting a boosting signal to the adjustment module according to the boosted second supply voltage. By decomposing the one-time starting process into multiple step-by-step starting processes, the present invention can ensure the safety of power consumption while realizing the starting ability of high-voltage large-capacitance loads.

Description

Technical Field

[0001] The present invention relates to the technical field of power supplies, and particularly to a switching power supply and an electronic device. Background Art

[0002] Due to the characteristic that the voltage across a capacitor cannot change abruptly, the two ends of the capacitor are equivalent to a short circuit at the moment of charging, and the impedance is almost zero, resulting in a large inrush current. When the load current is too large, the primary current coupled by the transformer will also increase accordingly, which may mis-trigger the over-current protection function of the PWM control chip. If the over-current point is set too large, the problem of mis-triggering of the over-current protection function caused by the starting of a large capacitive load can be avoided. However, because the over-current point is set too large, when the switching power supply operates abnormally, the over-current protection function of the PWM control chip may not be triggered in time, which is equivalent to losing this protection function and may lead to electrical safety problems.

[0003] And when the switching power supply starts up normally, it needs to charge the capacitive load first. After the capacitor is fully charged, the output becomes stable. According to the energy storage formula of the capacitor: It can be known that the starting ability of the capacitive load of the switching power supply and the required energy are most affected by the capacitor voltage. For example, the required energy differs by thousands of times under the conditions of 12V and 400V; but in order to ensure electrical safety, the current switching power supply can only handle small capacitive and low-voltage loads, and cannot achieve the load-carrying ability for high-voltage and large capacitive loads.

[0004] Therefore, the existing technology still needs to be improved. Summary of the Invention

[0005] In view of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a switching power supply and an electronic device, which can effectively solve the problem that the existing switching power supply cannot achieve the load-carrying ability for high-voltage and large capacitive loads.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A switching power supply includes a power supply front-end circuit, an adjustment module, an energy storage module, and at least one load starting module;

[0008] The power supply front-end module is used to convert the input alternating current into a boosted output, and output a first supply voltage and a second supply voltage to the load; wherein, the second supply voltage is in a proportional relationship with the first supply voltage;

[0009] The adjustment module is respectively connected to the power supply front-end module and the load starting module, and is used to adjust the second supply voltage to a preset voltage value by increasing the value of the first supply voltage, and further increase the second supply voltage by a preset value according to the boost signal output by the load starting module;

[0010] The load starting module is respectively connected to the regulation module and the power front-end module, and is configured to output a boost signal to the regulation module according to the boosted second supply voltage.

[0011] The energy storage module is respectively connected to the power front-end module and the regulation module, and is configured to store electrical energy during the boosting process of the first supply voltage and the second supply voltage.

[0012] In the switching power supply, the load starting module includes a comparison unit, a switching unit, and a signal output unit; the comparison unit outputs a control signal to the switching unit according to the boosted second supply voltage; the switching unit controls the signal output unit to output the boost signal to the regulation module according to the control signal.

[0013] In the switching power supply, the comparison unit includes a first resistor, a second resistor, a third resistor, and a comparator; one end of the first resistor is connected to the second output terminal of the power front-end circuit, the other end of the first resistor is connected to the positive-phase input terminal of the comparator and one end of the second resistor, the other end of the second resistor and one end of the third resistor are both grounded, the other end of the third resistor is connected to the inverting input terminal of the comparator and the first power supply terminal of the comparator, the first power supply terminal of the comparator is further connected to the first output terminal of the power front-end circuit, the second power supply terminal of the comparator is grounded, and the output terminal of the comparator is connected to the switching unit.

[0014] In the switching power supply, the switching unit includes a fourth resistor, a fifth resistor, a first capacitor, and a triode; one end of the fourth resistor is connected to the comparison unit, the other end of the fourth resistor is connected to the base of the triode, one end of the fifth resistor, and one end of the first capacitor, the other end of the fifth resistor, the other end of the first capacitor, and the emitter of the triode are all grounded, and the collector of the triode is connected to the signal output unit.

[0015] In the switching power supply, the signal output unit includes a sixth resistor, one end of the sixth resistor is connected to the collector of the triode, and the other end of the sixth resistor is connected to the regulation module.

[0016] In the described switching power supply, the regulation module includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a second capacitor, an optocoupler, and a voltage regulator; one end of the seventh resistor and one end of the ninth resistor are both connected to the first output terminal of the power supply front-end circuit, the other end of the seventh resistor, one end of the second capacitor, one end of the eighth resistor, and the reference electrode of the voltage regulator are all connected to the other end of the sixth resistor, the other end of the eighth resistor and the anode of the voltage regulator are both grounded, the other end of the second capacitor is connected to one end of the tenth resistor, the other end of the tenth resistor, one end of the eleventh resistor, and the cathode of the voltage regulator are all connected to the second pin of the optocoupler, the other end of the ninth resistor is connected to one end of the eleventh resistor and the first pin of the optocoupler, the fourth pin of the optocoupler is connected to the power supply front-end circuit, and the third pin of the optocoupler is grounded.

[0017] In the described switching power supply, the energy storage module includes a first energy storage unit and a second energy storage unit; the first energy storage unit is connected to the first output terminal of the load starting module and is used to store electrical energy during the boost process of the first supply voltage; the second energy storage unit is connected to the second output terminal of the load starting module and is used to store electrical energy during the boost process of the second supply voltage.

[0018] In the described switching power supply, the first energy storage unit includes a third capacitor, one end of the third capacitor is connected to the first output terminal of the power supply front-end module, and the other end of the third capacitor is grounded; the second energy storage unit includes a fourth capacitor, one end of the fourth capacitor is connected to the second output terminal of the power supply front-end module, and the other end of the fourth capacitor is grounded.

[0019] In the described switching power supply, the switching transistor is a triode, the first end of the switching transistor is the base of the triode, the second end of the switching transistor is the emitter of the triode, and the third end of the switching transistor is the collector of the triode; wherein, the triode is an NPN-type triode.

[0020] An electronic device, the electronic device includes the above-described switching power supply.

[0021] Compared with the prior art, the present invention provides a switching power supply and an electronic device. The switching power supply includes a power front-end circuit, an adjustment module, an energy storage module, and at least one load starting module. The power front-end module is configured to boost the input alternating current and then output a first supply voltage and a second supply voltage to the load. Among them, the second supply voltage is in a proportional relationship with the first supply voltage. The adjustment module is respectively connected to the power front-end module and the load starting module, and is configured to adjust the second supply voltage to a preset voltage value by increasing the voltage value of the first supply voltage, and further increase the second supply voltage by a preset value according to the boost signal output by the load starting module. The load starting module is respectively connected to the adjustment module and the power front-end module, and is configured to output a boost signal to the adjustment module according to the boosted second supply voltage. The energy storage module is respectively connected to the power front-end module and the adjustment module, and is configured to store electrical energy during the boosting process of the first supply voltage and the second supply voltage. By setting at least one load starting module, the present invention decomposes a single starting process into one or more step-by-step starting processes, which can ensure electrical safety while realizing the starting ability of high-voltage large-capacitance loads. Description of the Drawings

[0022] Figure 1 It is a structural block diagram of the switching power supply provided by the present invention;

[0023] Figure 2 It is a circuit schematic diagram of the load starting module in the switching power supply provided by the present invention;

[0024] Figure 3 It is a circuit schematic diagram of the switching power supply provided by the present invention. Detailed Embodiments

[0025] The switching power supply and the electronic device provided by the present invention can effectively solve the problem that the existing switching power supply cannot realize the load-carrying ability of high-voltage large-capacitance loads.

[0026] To make the objectives, technical solutions and effects of the present invention clearer and more definite, the following further elaborates the present invention with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The switching power supply and the electronic device provided by the present invention can be widely applied to the design circuits of high-voltage large-capacitance loads in multiple different fields, such as television power supplies, refrigerator power supplies, air conditioners, computers, and security products, etc. While ensuring the safety of the power supply, it can also improve the starting ability of the high-voltage large-capacitance load of the switching power supply.

[0028] Please refer to Figure 1, the switching power supply provided by the present invention includes a power front-end circuit 100, an adjustment module 200, an energy storage module 300, and at least one load starting module 400 connected to the power front-end circuit 100; the power front-end circuit 100 is respectively connected to the adjustment module 200 and the energy storage module 300, and the adjustment module 200 is also respectively connected to the load starting module 400.

[0029] Among them, the power front-end circuit 100 boosts the input alternating current and then outputs a supply voltage to the load 10. The supply voltage includes a first supply voltage and a second supply voltage, and the second supply voltage is directly proportional to the first supply voltage; after the adjustment module 200 is powered on, it adjusts the second supply voltage to a preset voltage value by increasing the value of the first supply voltage, and further adjusts the second supply voltage by a preset value according to the boost signal output by the load starting module 400; the load starting module 400 is used to output a boost signal to the adjustment module according to the boosted second supply voltage; the energy storage module 300 stores electrical energy during the boosting process of the first supply voltage and the second supply voltage, thereby ensuring a stable and reliable working voltage for the load.

[0030] Specifically, the power front-end circuit 100 includes an EMI filter 110, a rectifier bridge 120, a flyback transformer 130, a PWM control chip 140, and a switching transistor 150. The input alternating current is rectified by the EMI filter 110 and the rectifier bridge 120 and then output to the flyback transformer 130. After the PWM control chip 140 drives the switching transistor 150 to conduct, the flyback transformer 130 starts to work, and then the secondary winding starts to establish the output supply voltage, and the output supply voltage rises from 0. Among them, the flyback transformer 130 outputs two supply voltages, which are the first supply voltage and the second supply voltage respectively. When the secondary winding starts to establish the output voltage, the first supply voltage rises from 0, and the rise of the first supply voltage will cause the rise of the second supply voltage. Since the voltage value of the first supply voltage is determined by the adjustment module 200, after the adjustment module 200 determines the voltage value of the first supply voltage, the voltage value of the second supply voltage will change accordingly. Therefore, after the adjustment module 200 is powered on and works, it adjusts the voltage value of the first supply voltage to boost the second supply voltage to the preset voltage value, completing the first-stage boosting process; during the boosting process, the energy storage module 300 stores electrical energy.

[0031] After the second supply voltage is boosted to a preset voltage value, that is, after the boosting in the first stage is completed, the first load starting module 400 is triggered to work by the boosted second supply voltage. After the first load starting module 400 works, a boosting signal is output to the regulating module 200. Then, the regulating module 200 raises the first supply voltage according to this boosting signal. When the first supply voltage is raised by a preset value, the second supply voltage after the first adjustment is also raised by a preset value, thus completing the boosting process in the second stage. When the second supply voltage is first raised by a preset value, that is, after the boosting process in the second stage is completed, the second load starting module 400 is triggered to work by the raised second supply voltage. The second load starting module 400 outputs a boosting signal to the regulating module 200. The regulating module 200 continues to raise the second supply voltage by a preset value according to the boosting signal output by the second load starting module 400, thereby completing the boosting process in the third stage. When the first supply voltage is raised by a preset value for the second time, that is, after the boosting process in the second stage is completed, the third load starting module 400 is triggered to work by the raised second supply voltage. The third load starting module 400 outputs a boosting signal to the regulating module 200. Then, the regulating module 200 raises the second supply voltage for the third time by a preset value according to the boosting signal output by the third load starting module 400. And so on, until the last load starting module 400 is triggered and outputs the last boosting signal to the regulating module 200. At this time, the regulating module 200 raises the second supply voltage for the last time by a preset value according to this boosting signal, so that the voltage value of the second supply voltage reaches the target value, completing the boosting process in the last stage, and thus realizing the successive boosting of the supply voltage. It is equivalent that the present invention decomposes the original single starting process into multiple step-by-step starting processes by setting multiple load starting modules 400, avoiding the insufficient required energy and the overcurrent protection of the PWM control chip 140 being erroneously triggered by an excessive impact current caused by a too large voltage difference during a single starting. Thereby, it makes the starting of a high-voltage large-capacitance load feasible, and the starting ability of the high-voltage large-capacitance load of the switching power supply can be adjusted by setting the number of load starting modules 400.

[0032] Further, please refer to Figure 2, each of the load lifting modules 400 includes a comparison unit 410, a switching unit 420, and a signal output unit 430 that are connected in sequence. The comparison unit 410 is also connected in parallel between the first output terminal and the second output terminal of the power front-end circuit 100; the comparison unit 410 outputs a control signal to the switching unit 420 according to the boosted second power supply voltage; the switching unit 420 controls the signal output unit 430 to output the boosted signal to the adjustment module 200 according to the control signal, so as to facilitate the implementation of the voltage boosting process.

[0033] After the second power supply voltage is boosted to the preset voltage value, the comparison unit 410 outputs a control signal to the switching unit 420 according to the boosted second power supply voltage; when the preset voltage is boosted by a preset value, the comparison unit 410 outputs a control signal to the switching unit 420 according to the second power supply voltage after the preset value is boosted; in this embodiment, the switching unit 420 is turned on according to the control signal. After the switching unit 420 is turned on, the signal output unit 430 is connected to the adjustment module 200, which is equivalent to the signal output unit 430 participating in the work and outputting a boosted signal to the adjustment module 200, so that the adjustment module 200 boosts the voltage according to the boosted signal, effectively realizing the voltage boosting.

[0034] Further, the comparison unit 410 includes a first resistor R1, a second resistor R2, a third resistor R3, and a comparator A1; one end of the first resistor R1 is connected to the second output terminal of the power front-end circuit 100, and the other end of the first resistor R1 is connected to the positive input terminal of the comparator A1 and one end of the second resistor R2. The other end of the second resistor R2 and one end of the third resistor R3 are both grounded. The other end of the third resistor R3 is connected to the negative input terminal of the comparator A1 and the first power supply terminal of the comparator A1. The first power supply terminal of the comparator A1 is also connected to the first output terminal of the power front-end circuit 100. The second power supply terminal of the comparator A1 is grounded, and the output terminal of the comparator A1 is connected to the switching unit 420; in this embodiment, the first resistor R1 and the second resistor R2 divide the second power supply voltage output by the power front-end circuit 100 to obtain a sampling signal and output it to the comparator A1. Then, the comparator A1 compares the sampling signal with the voltage signal at the negative input terminal of the comparator A1. In this embodiment, when the comparator A1 compares that the sampling signal is greater than the voltage signal at the negative input terminal, a high-level control signal is output to the switching unit 420. Currently, in other embodiments, other comparison relationships can also be selected to output control signals of different levels, and the present invention does not limit this; thereby effectively controlling the switching unit 420.

[0035] Further, the switch unit 420 includes a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a triode Q1. Among them, the switching transistor Q1 is a triode. The first end of the switching transistor Q1 is the base of the triode Q1. The second end of the switching transistor Q1 is the emitter of the triode Q1. The third end of the switching transistor Q1 is the collector of the triode Q1. Among them, the triode Q1 is an NPN-type triode. One end of the fourth resistor R4 is connected to the comparison unit 410. The other end of the fourth resistor R4 is connected to the base of the triode Q1, one end of the fifth resistor R5, and one end of the first capacitor C1. The other end of the fifth resistor R5, the other end of the first capacitor C1, and the emitter of the triode Q1 are all grounded. The collector of the triode Q1 is connected to the signal output unit 430. In this embodiment, the triode Q1 is turned on according to the high-level signal output by the comparator A1. After the triode Q1 is turned on, the load starting module 400 is enabled to operate, so as to effectively control the signal output unit 430 to be connected to the adjustment module 200.

[0036] Further, the signal output unit 430 includes a sixth resistor R6. One end of the sixth resistor R6 is connected to the collector of the triode Q1. The other end of the sixth resistor R6 is connected to the adjustment module 200. After the triode Q1 is turned on, the sixth resistor R6 is connected to the adjustment module 200, which is equivalent to outputting a boost signal to the adjustment module 200, so as to realize the subsequent voltage boost process.

[0037] Further, the adjustment module 200 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a second capacitor C2, an optocoupler U1, and a voltage regulator U0. One end of the seventh resistor R7 and one end of the ninth resistor R9 are both connected to the first output terminal of the power supply front-end circuit 100. The other end of the seventh resistor R7, one end of the second capacitor C2, one end of the eighth resistor R8, and the reference electrode of the voltage regulator U0 are all connected to the other end of the sixth resistor R6. The other end of the eighth resistor R8 and the anode of the voltage regulator U0 are both grounded. The other end of the second capacitor C2 is connected to one end of the tenth resistor R10. The other end of the tenth resistor R10, one end of the eleventh resistor R11, and the cathode of the voltage regulator U0 are all connected to the second pin of the optocoupler U1. The other end of the ninth resistor R9 is connected to one end of the eleventh resistor R11 and the first pin of the optocoupler U1. The fourth pin of the optocoupler U1 is connected to the power supply front-end circuit 100, and the third pin of the optocoupler U1 is grounded. The voltage value of the first supply voltage is determined by the voltage source, the seventh resistor R7, and the eighth resistor R8. By adjusting the parameter ratio of the seventh resistor R7 and the eighth resistor R8, the second supply voltage can be adjusted to a preset voltage value, thereby effectively adjusting the second supply voltage.

[0038] Further, please refer to Figure 3 , the energy storage module 300 includes a first energy storage unit 310 and a second energy storage unit 320. The first energy storage unit 310 is connected to the first output terminal of the load starting module 400 and is used to store electrical energy during the boosting process of the first supply voltage. The second energy storage unit 320 is connected to the second output terminal of the load starting module 400 and is used to store electrical energy during the boosting process of the second supply voltage.

[0039] Specifically, the first energy storage unit 310 includes a third capacitor C3. One end of the third capacitor C3 is connected to the first output terminal of the power supply front-end module 100, and the other end of the third capacitor C3 is grounded. The second energy storage unit 320 includes a fourth capacitor C4. One end of the fourth capacitor C4 is connected to the second output terminal of the power supply front-end module 100, and the other end of the fourth capacitor C4 is grounded. During the boosting process of the first supply voltage, the third capacitor C3 stores electrical energy. By setting the third capacitor C3, the stability of the output of the first supply voltage can be effectively ensured. In addition, during the boosting process of the second supply voltage, the fourth capacitor C4 stores electrical energy. By setting the fourth capacitor C4, the stability of the output of the supply voltage can be effectively ensured.

[0040] For a better understanding of the present invention, the following is combined with Figure 2 and3 , specific application embodiments are given to describe in detail the starting process of the switching power supply provided by the present invention:

[0041] In this embodiment, taking the example of setting two load starting modules to complete the 400V high-voltage starting, the starting process of the switching power supply is described in detail; among them, the first resistors in the two load starting modules are denoted as R101 and R102 respectively, the second resistors are denoted as R201 and R202 respectively, the third resistors are denoted as R301 and R302 respectively, the fourth resistors are denoted as R401 and R402 respectively, the fifth resistors are denoted as R501 and R502 respectively, the sixth resistors are denoted as R601 and R602 respectively, and the comparators are denoted as A11 and A12; in this embodiment, the model of the voltage regulator source is TL431. Since the maximum withstand voltage of this type of voltage regulator source is 36V, an output auxiliary winding N2 needs to be added to output 400V high voltage. The output voltage of its auxiliary winding N2 is proportional to the secondary winding N1. After adopting the high-voltage large-capacitive load starting circuit, its starting process is divided into three stages. After each stage is completed, the output auxiliary winding voltages reach 240V, 320V, and 400V respectively. Through the above capacitance energy storage formula It can be seen that the energy required during the voltage rise process in each stage is not much different.

[0042] The first stage is the establishment process of the high-voltage large-capacitive load voltage from 0V to 240V. The input alternating current is rectified by the EMI filter and the rectifier bridge and then sent to the flyback transformer. The 5th pin of the PWM control chip outputs a drive to the switching transistor. After the switching transistor conducts, the flyback transformer works, and the secondary winding starts to establish an output voltage, and the VOUT1 output voltage starts to rise from 0V. The magnitude of the VOUT1 output voltage is determined by the voltage regulator source, the seventh resistor, and the eighth resistor, and the relationship is wherein, R7 and R8 are the resistances of the seventh resistor and the eighth resistor respectively. By setting the parameter ratio of R7 and R8, when the VOUT2 voltage rises to about 240V, it is the second power supply voltage boosted to the preset voltage. During this process, the fourth capacitor in the high-voltage output circuit is charged.

[0043] The second stage is the establishment process of the high-voltage large-capacitive load voltage from 240V to 320V, which is equivalent to the preset value being increased by 80V. As the fourth capacitor C4 is charged, when the VOUT2 voltage reaches 240V, at this time, the voltage at the positive input terminal of the comparator A11 starts to be greater than the voltage at the negative input terminal, and the output terminal of the comparator A11 outputs a high level, and the triode Q11 is turned on through the resistor R401. After the triode Q11 conducts, R601 is added in parallel with R8, and the total resistance value decreases. At this time where R601 is the resistance value of the sixth resistor R601. The output voltage VOUT1 of the secondary winding continues to rise, and the voltage of the auxiliary winding VOUT2 also increases accordingly and finally rises to 320V.

[0044] The third stage is the establishment of the high-voltage large capacitive load voltage from 320V to 400V, and its process is similar to the above stage. After the VOUT2 voltage stabilizes at 320V, the voltage at the positive input terminal of the comparator A12 is greater than the voltage at the negative input terminal, and the output terminal of the comparator outputs a high level, making the triode Q12 conduct through the resistor R402. After the triode Q12 conducts, R602 is added to the parallel circuit of R601 and R8, and its total resistance further decreases, and the VOUT1 voltage starts to rise again. As the VOUT1 voltage of the secondary winding N1 stabilizes at wherein, R602 is the resistance value of the sixth resistor R602, and VOUT2 also rises from 320V and stabilizes at 400V, which is equivalent to the voltage value of the second power supply voltage reaching the target value, and finally completes the startup of the high-voltage large capacitive load.

[0045] The present invention forms a load startup module through common components such as comparators, triodes, and several resistors. The circuit structure design is simple, which can effectively save the design cost. By setting the load startup circuit, the one-time startup process during output establishment can be decomposed into multiple step-by-step startups, avoiding the insufficient required energy and the overcurrent protection of the PWM control chip being mis-triggered due to excessive voltage difference during startup, so that the startup of the high-voltage large capacitive load is feasible, and while ensuring electrical safety, the startup ability of the high-voltage large capacitive load can also be realized. In actual situations, multiple load startup modules can be added in parallel according to requirements, so that the startup process is divided into more stages. By flexibly adjusting the resistance parameter ratio of the voltage regulator and the comparator periphery, different voltage points in different stages can be effectively set, which can meet the settings of different voltage points and improve the flexibility of the circuit setting.

[0046] The present invention also correspondingly provides an electronic device, and the electronic device includes the above-mentioned switching power supply. Since the switching power supply has been described in detail above, it will not be elaborated here.

[0047] In summary, a switching power supply and an electronic device provided by the present invention. The switching power supply includes a power front-end module, an adjustment module, an energy storage module, and at least one load starting module; the power front-end module is used for boosting and converting the input alternating current and then outputting a first supply voltage and a second supply voltage to the load; wherein, the second supply voltage is in a proportional relationship with the first supply voltage; the adjustment module is respectively connected to the power front-end module and the load starting module, and is used for boosting the second supply voltage to a preset voltage value by boosting the value of the first supply voltage, and further boosting the second supply voltage by a preset value according to the boosting signal output by the load starting module; the load starting module is respectively connected to the adjustment module and the power front-end module, and is used for outputting a boosting signal to the adjustment module according to the boosted second supply voltage; the energy storage module is respectively connected to the power front-end module and the adjustment module, and is used for storing electrical energy during the boosting process of the first supply voltage and the second supply voltage; by setting multiple load starting modules, the present invention decomposes a single starting process into multiple step-by-step starting processes, and can achieve the starting ability of high-voltage large-capacitance loads while ensuring electrical safety.

[0048] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solutions and inventive concepts of the present invention, and all such changes or substitutions should fall within the protection scope of the claims appended to the present invention.

Claims

1. A switching power supply, characterized in that, Including: A power front-end module, an adjustment module, an energy storage module, and at least one load starting module; The power front-end module is used to boost and convert the input alternating current and then output a first supply voltage and a second supply voltage to the load; wherein, the second supply voltage is in a proportional relationship with the first supply voltage; The adjustment module is respectively connected to the power front-end module and the load starting module, and is used to boost the second supply voltage to a preset voltage value by increasing the voltage value of the first supply voltage, and further boost the second supply voltage by a preset value according to the boost signal output by the load starting module; The load starting module is respectively connected to the adjustment module and the power front-end module, and is used to output a boost signal to the adjustment module according to the boosted second supply voltage; The energy storage module is respectively connected to the power front-end module and the adjustment module, and is used to store electrical energy during the boosting process of the first supply voltage and the second supply voltage; the load starting module includes a comparison unit, a switch unit, and a signal output unit connected in sequence, and the comparison unit is also connected in parallel between the first output terminal and the second output terminal of the power front-end module; the comparison unit is used to output a control signal to the switch unit according to the boosted second supply voltage; the switch unit is used to control the signal output unit to output the boost signal to the adjustment module according to the control signal.

2. The switching power supply according to claim 1, wherein The comparison unit includes a first resistor, a second resistor, a third resistor, and a comparator; one end of the first resistor is connected to the second output terminal of the power front-end module, the other end of the first resistor is connected to the positive input terminal of the comparator and one end of the second resistor, the other end of the second resistor and one end of the third resistor are both grounded, the other end of the third resistor is connected to the negative input terminal of the comparator and the first power supply terminal of the comparator, the first power supply terminal of the comparator is also connected to the first output terminal of the power front-end module, the second power supply terminal of the comparator is grounded, and the output terminal of the comparator is connected to the switch unit.

3. The switching power supply according to claim 2, characterized in that, The switch unit includes a fourth resistor, a fifth resistor, a first capacitor, and a switch tube; one end of the fourth resistor is connected to the comparison unit, the other end of the fourth resistor is connected to the first end of the switch tube, one end of the fifth resistor, and one end of the first capacitor, the other end of the fifth resistor, the other end of the first capacitor, and the second end of the switch tube are all grounded, and the third end of the switch tube is connected to the signal output unit.

4. The switching power supply according to claim 3, wherein The signal output unit includes a sixth resistor, one end of the sixth resistor is connected to the collector of the switch tube, and the other end of the sixth resistor is connected to the adjustment module.

5. The switching power supply according to claim 4, characterized in that The adjustment module includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a second capacitor, an optocoupler, and a voltage regulator source; one end of the seventh resistor and one end of the ninth resistor are both connected to the first output terminal of the power supply front-end module, the other end of the seventh resistor, one end of the second capacitor, one end of the eighth resistor, and the reference pole of the voltage regulator source are all connected to the other end of the sixth resistor, the other end of the eighth resistor and the anode of the voltage regulator source are both grounded, the other end of the second capacitor is connected to one end of the tenth resistor, the other end of the tenth resistor, one end of the eleventh resistor, and the cathode of the voltage regulator source are all connected to the second pin of the optocoupler, the other end of the ninth resistor is connected to one end of the eleventh resistor and the first pin of the optocoupler, the fourth pin of the optocoupler is connected to the power supply front-end module, and the third pin of the optocoupler is grounded.

6. The switching power supply according to claim 1, characterized in that The energy storage module includes a first energy storage unit and a second energy storage unit; the first energy storage unit is connected to the first output terminal of the load starting module and is used to store electrical energy during the boosting process of the first supply voltage; the second energy storage unit is connected to the second output terminal of the load starting module and is used to store electrical energy during the boosting process of the second supply voltage.

7. The switching power supply according to claim 6, wherein, The first energy storage unit includes a third capacitor, one end of the third capacitor is connected to the first output terminal of the power supply front-end module, and the other end of the third capacitor is grounded; the second energy storage unit includes a fourth capacitor, one end of the fourth capacitor is connected to the second output terminal of the power supply front-end module, and the other end of the fourth capacitor is grounded.

8. The switching power supply according to claim 3, wherein The switching transistor is a triode, the first end of the switching transistor is the base of the triode, the second end of the switching transistor is the emitter of the triode, and the third end of the switching transistor is the collector of the triode; wherein, the triode is an NPN type triode.

9. An electronic device, characterized in that, The electronic device includes the switching power supply according to any one of claims 1-8.

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