CN117674589A

CN117674589A - BOOST circuit and method supporting wide voltage input

Info

Publication number: CN117674589A
Application number: CN202311658639.4A
Authority: CN
Inventors: 王明瑞; 王海龙; 范勇; 李少科; 陈学文; 唐辉
Original assignee: Sichuan Ledfriend Science And Technology Co ltd
Current assignee: Sichuan Ledfriend Science And Technology Co ltd
Priority date: 2023-12-05
Filing date: 2023-12-05
Publication date: 2024-03-08

Abstract

The invention discloses a BOOST circuit and a method for supporting wide voltage input, comprising the following steps: the rectification circuit is used for converting alternating current input voltage of the alternating current power supply into direct current voltage; an overvoltage protection circuit connected to the rectifying circuit for monitoring the voltage and cutting off the current to protect the subsequent circuit when an overvoltage condition is detected; the BOOST circuit is connected with the overvoltage protection circuit and is used for boosting the direct-current voltage and boosting the direct-current voltage to a preset high-voltage output; and the filter circuit is connected to the BOOST circuit, and is used for filtering out generated voltage fluctuation or ripple when the direct-current voltage is increased to a preset high voltage, so as to provide a smooth output voltage. Only a small number of devices are added on the traditional BOOST structure, and the on-off of the corresponding MOS is controlled by matching with the sampling and algorithm of the singlechip, so that the power supply can support the AC input of higher voltage under the condition that the circuit topology structure is not changed and the output voltage is ensured to be in a required range.

Description

BOOST circuit and method supporting wide voltage input

Technical Field

The invention relates to the technical field of power electronics, in particular to a BOOST circuit and a BOOST method supporting wide voltage input.

Background

The BOOST circuit with the traditional BOOST DC-DC (hereinafter collectively referred to as BOOST) structure is applied to the field of switching power supplies in a large scale due to the simple structure and mature scheme. In practical applications, the output of a switching power supply needs to be maintained at a stable voltage, such as 400Vdc. Instead of a steady direct current, the alternating current of the commercial power 220Vac is rectified and the peak voltage of the direct current is about 311V. And if it is industrial three-phase electricity or electricity in other countries or regions of the world, it is not necessarily 220Vac or even higher. If the ac power input by the power supply is 300Vac, the peak voltage of the rectified ac power is about 424V, which is higher than the required 400Vdc, and the BOOST structure in the power supply cannot work normally, so that the later parts of the power supply are likely to be damaged due to exceeding the designed voltage value.

In the boosting principle of a BOOST circuit in the prior art, as shown in fig. 1, V1 is a direct current voltage source and provides stable direct current output; q1 is a switch MOS tube, V2 is a switch signal which provides high frequency for Q1 by a signal generator. When the circuit works, Q1 is conducted for Ton time, at the moment, current flows to GND along L1-Q1, leftward electromotive force can be induced on L1 due to the fact that current of the inductor cannot be suddenly changed, the current can linearly rise, at the moment, the circuit is equivalent to charging L1, and energy is stored in the L1 in a magnetic field mode. Q1 is turned off for Toff time, the electromotive force of L1 is rightward and is connected with a power supply V1 in series to realize boosting, and current flows to loads C1 and R1 through D1. At Toff current charges C1 via L1-D1 and powers R1, and at Ton C1 powers R1 to ensure a continuous current supply on R1. The BOOST structure has considerable efficiency as a BOOST circuit and is widely applied in the field of switching power supplies, if the input of 400Vdc with constant output is required to be at least less than 385Vdc, namely, the maximum input of 272Vac of alternating current is rectified direct current, and if the input voltage exceeds the voltage value, the circuit cannot work normally or even is damaged.

Accordingly, there is a need for a BOOST circuit and method that supports wide voltage inputs.

Disclosure of Invention

The invention provides a BOOST circuit and a method for supporting wide voltage input, which are used for solving the problems that if the alternating current input by a power supply is 300Vac in the prior art, the voltage peak value after rectification is about 424V and is higher than 400Vdc which is required, the BOOST structure serving as 'BOOST' in the power supply can not work normally, and the later-stage components of the power supply are likely to be damaged due to exceeding the designed voltage value.

In order to achieve the above purpose, the present invention provides the following technical solutions:

a BOOST circuit supporting a wide voltage input, comprising: the device comprises a rectifying circuit, an overvoltage protection circuit, a BOOST circuit and a filter circuit;

the rectification circuit is used for converting alternating current input voltage of the alternating current power supply into direct current voltage;

an overvoltage protection circuit connected to the rectifying circuit for monitoring the voltage and cutting off the current to protect the subsequent circuit when an overvoltage condition is detected;

the BOOST circuit is connected with the overvoltage protection circuit and is used for boosting the direct-current voltage and boosting the direct-current voltage to a preset high-voltage output;

and the filter circuit is connected to the BOOST circuit, and is used for filtering out generated voltage fluctuation or ripple when the direct-current voltage is increased to a preset high voltage, so as to provide a smooth output voltage.

Wherein, the rectifier circuit includes: diode D1, diode D2, diode D3, and diode D4;

the cathode of the diode D1 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with the cathode of the diode D4, the anode of the diode D3 and the anode of the diode D4 are connected to the cathode of the rectifying circuit, and the anode of the diode D1 and the cathode of the diode D3 are connected to form a bridge rectifier to convert the alternating current input of the alternating current power supply V1 into direct current voltage.

Wherein, overvoltage protection circuit includes: a transistor Q2, a signal generator V3 and a diode D7;

the output end of the rectifying circuit is connected with a transistor Q2, the source electrode of the transistor Q2 is connected with the cathode of a diode D7, and a signal generator V3 is connected between the grid electrode of the transistor Q2 and the cathode of the diode D7;

the transistor Q2 is used for supporting high voltage input, the signal generator V3 is a driving signal of the transistor Q2, the driving IC is controlled by the singlechip to drive the transistor Q2 in a floating mode, and when the transistor Q2 is turned off, a circuit is formed by a later-stage circuit in the anode-to-cathode direction of the diode D7.

Wherein, BOOST circuit includes: a capacitor C1, a resistor R2, an inductor L1, a diode D5 and a capacitor C2;

one end of the capacitor C1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected with the anode of the diode D5 through the inductor L1, the cathode of the diode D5 is connected to one end of the capacitor C2, and the other end of the capacitor C2 is connected back to the node of the capacitor C1; the inductor L1 is used as BOOST, and the capacitor C1 and the capacitor C2 are part of a BOOST structure.

Wherein the filter circuit includes: a transistor Q3, a resistor R1 and a capacitor C3;

one end of the resistor R1 is connected with the grid electrode of the transistor Q3, the other end of the resistor R1 is connected with the capacitor C3, and the capacitor C3 is connected with the grid electrode of the transistor Q3;

a transistor Q3 as a control element of the circuit, for stably controlling the voltage in the circuit;

resistor R1 is used to set and adjust the operating point of transistor Q3;

the capacitor C3 works together with the transistor Q3 and the resistor R1 to filter out voltage fluctuations or ripple generated in the circuit and provide a smooth output voltage.

Wherein, BOOST circuit still includes: a signal generator V2, a diode D8, a transistor Q1 and a voltage V2;

the signal generator V2 is connected with the grid electrode of the transistor Q1, the anode of the diode D8 is connected with the source electrode of the transistor Q1, and the cathode of the diode D8 is grounded;

diode D8 is used to prevent loop current from flowing back through transistor Q1 and thereby damaging transistor Q1.

Wherein, include:

when the input alternating current is 220Vac, activating V3 to output high level, continuously controlling the switching tube Q2 to be conducted, and guiding the operation of the whole circuit;

the C1 capacitor is positioned at the input end of Vin, and the voltage waveform at the Vin point is maintained in the fluctuation range of 300V after being regulated through filtering treatment;

the transistor Q3 is used as a core voltage stabilizing component and receives the boosted voltage, and the output voltage Vout is ensured to be stabilized at the level of 400Vdc step by step after being subjected to voltage stabilizing treatment through control and regulation.

In the whole circuit, the singlechip controls the driving IC to drive the transistor Q2 in a floating mode, and the current driving is replaced by the signal generator V3.

The control method of the BOOST circuit supporting the wide voltage input comprises the following steps:

s101: converting an alternating input voltage of an alternating current power supply into a direct current voltage through a rectifying circuit;

s102: the overvoltage protection circuit monitors the voltage and cuts off the current to protect the subsequent circuit when an overvoltage condition is detected;

s103: boosting the direct-current voltage through a BOOST circuit, and raising the direct-current voltage to a preset high-voltage output;

s104: when the direct-current voltage is increased to a preset high voltage through a filter circuit, the generated voltage fluctuation or ripple wave is filtered out, and a smooth output voltage is provided;

s105: and outputting the processed stable direct-current voltage to a subsequent circuit or equipment for use.

Wherein, the step S102 includes:

s1021: the output end of the rectifying circuit is connected with the transistor Q2, and the transistor Q2 supports high-voltage input;

s1022: connecting a signal generator V3 between the grid electrode of the transistor Q2 and the cathode of the diode D7, wherein the signal generator V3 controls the driving IC to perform floating driving on the transistor Q2 through the singlechip;

s1023: when the transistor Q2 is turned off, the latter circuit forms a loop through the anode-to-cathode direction of the diode D7, wherein the diode D7 forms a loop when the transistor Q2 is turned off so as to facilitate the subsequent voltage processing;

s1024: the voltage is monitored, and when the voltage is detected to exceed a preset safety range, the current is immediately cut off so as to prevent the damage of overvoltage to a subsequent circuit.

Compared with the prior art, the invention has the following advantages:

a BOOST circuit supporting a wide voltage input, comprising: the rectification circuit is used for converting alternating current input voltage of the alternating current power supply into direct current voltage; an overvoltage protection circuit connected to the rectifying circuit for monitoring the voltage and cutting off the current to protect the subsequent circuit when an overvoltage condition is detected; the BOOST circuit is connected with the overvoltage protection circuit and is used for boosting the direct-current voltage and boosting the direct-current voltage to a preset high-voltage output; and the filter circuit is connected to the BOOST circuit, and is used for filtering out generated voltage fluctuation or ripple when the direct-current voltage is increased to a preset high voltage, so as to provide a smooth output voltage. Only a small number of devices are added on the traditional BOOST structure, and the on-off of the corresponding MOS is controlled by matching with the sampling and algorithm of the singlechip, so that the power supply can support the AC input of higher voltage under the condition that the circuit topology structure is not changed and the output voltage is ensured to be in a required range.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

The technical scheme of the invention is further described in detail through the drawings and the embodiments.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:

FIG. 1 is a diagram of a BOOST circuit of a conventional BOOST DC-DC (hereinafter referred to as BOOST) structure in the background of the invention;

FIG. 2 is a block diagram of a BOOST circuit supporting a wide voltage input in accordance with an embodiment of the present invention;

FIG. 3 is a schematic diagram of a BOOST circuit supporting a wide voltage input in accordance with an embodiment of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.

The embodiment of the invention provides a BOOST circuit supporting wide voltage input, which comprises the following components: the device comprises a rectifying circuit, an overvoltage protection circuit, a BOOST circuit and a filter circuit;

The working principle of the technical scheme is as follows: the rectifying circuit comprises four diodes D1, D2, D3 and D4 of 1N4007 type, which form a bridge rectifier to convert the alternating current input of the alternating current power supply V1 into direct current output so as to adapt to the requirement of wide voltage input; the overvoltage protection circuit comprises an IRFP22N50A type power transistor Q2, a signal generator V3, a diode D7 and a driving signal of Q2, wherein the Q2 works together with an inductor L1 and a capacitor C1 to form an overvoltage protection circuit for monitoring voltage and cutting off current to protect a subsequent circuit when an overvoltage condition is detected; the BOOST circuit includes: the capacitor C1, the resistor R2, the inductor L1, the diode D5 and the capacitor C2 are used for boosting the direct-current voltage and boosting the direct-current voltage to a preset high-voltage output; the filter circuit comprises a transistor Q3, a resistor R1 and a capacitor C3, and when the direct current voltage is increased to a preset high voltage, the generated voltage fluctuation or ripple wave is filtered out, and a smooth output voltage is provided.

The beneficial effects of the technical scheme are as follows: the alternating input voltage of the alternating current power supply is converted into direct current voltage, so that a subsequent circuit can use a stable direct current power supply, which is helpful for providing stable power supply and ensuring the normal operation of the circuit; the overvoltage protection circuit can prevent the voltage from exceeding a set range, avoid damaging circuits or equipment and improve the reliability and safety of a system; the BOOST circuit is connected with the overvoltage protection circuit and is used for boosting the direct-current voltage to a preset high-voltage output, and the BOOST circuit can provide required high-voltage supply to meet the requirements of specific applications, such as high-voltage driving, energy storage and the like; the voltage regulator is connected to a BOOST circuit, and when the direct current voltage is increased to a preset high voltage, the generated voltage fluctuation or ripple wave is filtered, the smooth output voltage is provided, the ripple wave and noise in the output voltage are reduced by a filter circuit, stable power supply is provided, and the normal operation of a subsequent circuit is ensured.

In another embodiment, a rectifying circuit includes: diode D1, diode D2, diode D3, and diode D4;

The working principle of the technical scheme is as follows: in this bridge rectifier, the four diodes (D1, D2, D3 and D4) are connected in such a way as to allow the current to flow through two different paths in the positive half-cycle and in the negative half-cycle, respectively, by means of the conduction characteristics of the diodes, which are turned on when the anode voltage of the diodes is higher than the cathode voltage, allowing the current to pass; conversely, when the cathode voltage is higher than the anode voltage, it is turned off and the current cannot pass;

when the ac input of the power source V1 is applied to the bridge rectifier, the polarity of the ac voltage changes every half cycle; in the positive half cycle, the anode of D1 (connected to the cathode of D3) is at a higher voltage than its cathode, so that D1 and D3 conduct, allowing current to flow through them, then through the common point connected to the cathode, and in the negative half cycle, the anode of D2 (connected to the cathode of D4) is at a higher voltage than its cathode, so that D2 and D4 conduct, current again flows through them, then also through the common point connected to the cathode;

since the diode allows current to pass only in one direction, current always flows in one direction throughout the ac cycle, converting the output of the ac power supply into a dc output, the waveform of which is somewhat pulsating, but which can be made more stable by using filter capacitors or the like.

The beneficial effects of the technical scheme are as follows: the bridge rectifier uses four diodes so that the current can be rectified in both the positive and negative half cycles, which means that the rectifier can convert both half cycles of the ac input into dc output, thus reducing the amplitude of the output ripple, which helps to obtain a more stable dc voltage; compared with a half-wave rectifying circuit, the efficiency of the bridge rectifier is higher, and only two diodes are conducted instead of four diodes in each half cycle, so that the power consumption and the heat loss of the diodes are reduced, and the overall efficiency is improved; the bridge rectifiers are connected in such a way that the current flows through two different paths, D1/D3 and D2/D4, which reduces the current load on each diode, helping to share the heat and reducing the risk of overheating the diodes.

In another embodiment, an overvoltage protection circuit includes: a transistor Q2, a signal generator V3 and a diode D7;

The working principle of the technical scheme is as follows: the transistor Q2 (the transistor represents a metal oxide semiconductor field effect transistor) is used for supporting high voltage input, V3 is a driving signal of Q2, in practical situations, the driving IC is controlled by the single chip microcomputer to drive the Q2 in a floating manner, the signal generator is used for replacing the driving IC, when the Q2 is turned off, the back-stage circuit cannot form a loop with the ground, and the function of D7 is to enable the back-stage circuit to form a loop in the direction indicated by an arrow (as shown in fig. 3) so as to ensure normal operation.

The beneficial effects of the technical scheme are as follows: by using the transistor Q2 as a switch, a high voltage input can be supported; the transistor has higher voltage-resistant capability and can normally work in a high-voltage environment, so that a subsequent circuit is protected from being influenced by high voltage; v3 is used as a driving signal of the transistor Q2, the driving IC is controlled by the singlechip to drive the transistor Q2 in a floating manner, and the control mode can realize the switching operation of the transistor, so that the on-off state of the circuit is controlled; when the transistor Q2 is in an off state, a subsequent circuit can be made to form a loop from bottom to top through the diode D7, and this loop formation can realize the flow of current, thereby forming a loop to prevent the circuit from being damaged due to the induction of high voltage.

In another embodiment, a BOOST circuit includes: a capacitor C1, a resistor R2, an inductor L1, a diode D5 and a capacitor C2;

The working principle of the technical scheme is as follows: when an input voltage is applied to the capacitor C1, the capacitor C1 starts to charge. Meanwhile, the resistor R2 limits the flow of current to control the charging speed; when the capacitor C1 is charged to a certain degree, the inductor L1 starts to store energy. At this stage, the voltage of the capacitor C1 starts to rise; when the voltage of the capacitor C1 reaches a certain threshold, the diode D5 is turned on to release the energy stored in the inductor L1 into the capacitor C2; after the diode D5 is turned on, the capacitor C2 starts to charge, and the voltage of the capacitor C1 starts to drop; when the voltage of the capacitor C1 drops to a certain level, the diode D5 is turned off to stop the energy transmission. At this time, the voltage of the capacitor C2 reaches the desired boost output.

The beneficial effects of the technical scheme are as follows: BOOST circuits BOOST an input voltage to a desired output voltage by storing and discharging energy. This helps to meet the high voltage supply requirements of a particular application; the BOOST circuit can provide stable output voltage by using the capacitor C2 for energy storage and smooth output, and ripple and noise of the output voltage are reduced; the BOOST circuit BOOSTs voltage by using the inductor L1 and transmits energy to the capacitor C2 through the diode D5, and the energy utilization efficiency can be improved and the energy loss can be reduced by adopting the energy transfer mode.

In another embodiment, a filter circuit includes: a transistor Q3, a resistor R1 and a capacitor C3;

resistor R1 is used to set and adjust the operating point of transistor Q3;

The working principle of the technical scheme is as follows: in the filter circuit, the transistor Q3 acts as a main control element responsible for stabilizing and regulating the voltage in the circuit; resistor R1 and capacitor C3 together with transistor Q3 form a low pass filter, the purpose of which is to reduce voltage ripple and ripple, thereby providing a smoother dc voltage output; the resistor R1 is connected to the grid electrode of the transistor Q3 and one end of the capacitor C3, the other end of the resistor R1 is directly connected to the grid electrode of the transistor Q3, the resistor R1 is used for providing a bias voltage for the transistor Q3, setting and adjusting the working point of the resistor R1, ensuring that the transistor can operate in a proper working area, and effectively controlling the current passing through the transistor;

the capacitor C3 plays a role of decoupling and filtering in the circuit, and together with the resistor R1, determines the cut-off frequency of the filtering circuit, helps to remove high-frequency noise and ripple, allows low-frequency signals or direct-current components to pass through, and when the voltage in the circuit fluctuates, the capacitor C3 charges or discharges to counteract the fluctuations, so that the stability of the output voltage is maintained.

The beneficial effects of the technical scheme are as follows: the control function of the transistor Q3 ensures the voltage stability in the circuit and improves the adaptability and the robustness of the circuit to load change; the combination of the capacitor C3, the resistor R1 and the transistor Q3 effectively filters out voltage fluctuation and ripple waves in the circuit, and provides smoother direct-current voltage output, which is critical to the normal operation of sensitive electronic equipment; by using a small number of components (a transistor, a resistor and a capacitor), this filter circuit provides a simple and efficient solution to reduce the complexity and cost of the circuit design; the reasonable working point setting and the effective filtering mechanism can reduce energy loss and improve the energy efficiency ratio of the whole circuit; the cut-off frequency of the filter can be easily adjusted by changing the values of the resistor R1 and the capacitor C3 so as to adapt to different application requirements and performance standards.

In another embodiment, the BOOST circuit further comprises: a signal generator V2, a diode D8, a transistor Q1 and a voltage V2;

The working principle of the technical scheme is as follows: and the diode D8 is used for preventing loop current from reversely flowing from the Q1 so as to damage the MOS tube.

The beneficial effects of the technical scheme are as follows: and the diode D8 is used for preventing loop current from reversely flowing from the Q1 so as to damage the MOS tube.

In another embodiment, the method comprises:

The working principle of the technical scheme is as follows: the capacitor C1 is positioned at the input end Vin, and the waveform of the input voltage Vin is maintained in the fluctuation range of 300V after being regulated through filtering treatment, which is realized through the low impedance characteristic of the capacitor, and the capacitor can smooth the fluctuation of the input voltage and ensure the stability of the voltage stabilizing circuit; the transistor Q3 is used as a core component of the voltage stabilizing circuit, receives the boosted voltage, ensures that the output voltage Vout is stabilized at the level of 400Vdc after the voltage stabilizing treatment by control and regulation, and the channel resistance of the transistor can be changed according to the change of the control voltage so as to adjust the output voltage, and can realize the stability of the output voltage under different input voltage conditions by dynamically adjusting the working point of the transistor; when the input ac voltage is 220Vac, V3 is activated and outputs a high level, and the switching transistor Q2 is continuously controlled to be turned on, so that the whole circuit starts to operate, and the on state of the switching transistor Q2 determines the operating state of the boost circuit, thereby affecting the input voltage of the transistor Q3.

When the input ac voltage is raised to 380Vac, the peak voltage of the input ac voltage after passing through the rectifier bridge reaches 380 x v2=537V, and at this time V3 starts to output a PWM signal with a frequency of 1kHz to drive Q2 to turn on and off. Because Vin voltage can dynamically change along with the change of the load, the input voltage can be kept at about 250Vdc by adjusting the duty ratio together with V2. Although the time required for the two curves to reach steady state is different from the 220Vac input, the output voltage can eventually be maintained at 400Vdc. In practical application, V2 and V3 are controlled by a singlechip, and data are input into the singlechip after voltage sampling is carried out on Vout at an output side, and the singlechip is matched with a PID algorithm to carry out comprehensive control on V2 and V3.

Wherein: d (V2) =40%; f (V2) =50k; d (V3) =2.77%; f (V3) =1k, other parameters are shown.

Main control strategy of single chip microcomputer: first, Q2 is kept on normally, i.e., D (V3) =1, and when the input ac voltage rises upward from 220Vac, D (V2) is gradually adjusted downward to maintain output 400Vdc. If the input voltage continues to rise to around 305Vac, D (V2) has already fallen to 0, at which point the output has not been stabilized to 400Vdc by continuing to lower D (V2). Therefore, the singlechip needs to start controlling the Q2 to work when the input voltage rises to about 280Vac, and D (V3) is downwards regulated from 1. Because of the precision of the output PWM and the problem of nonlinear relation with the output, each time D (V3) is adjusted downwards by one unit depth, the output is precisely controlled by matching with D (V2) to increase from 0, namely D (V3) coarse adjustment and D (V2) fine adjustment. Since D (V2), D (V3) and output Vout are not linear, the control relationship between the two should use PID algorithm with feedback.

The beneficial effects of the technical scheme are as follows: the fluctuation range of the input voltage Vin is limited to be within 300V through the filtering process of the capacitor C1, so that the stability of the voltage stabilizing circuit is kept, and the influence of the fluctuation of the input voltage on the output voltage is avoided; the transistor Q3 is used as a core voltage stabilizing component, and the output voltage Vout is ensured to be stabilized at the level of 400Vdc after being stabilized by controlling and regulating the input voltage, which is very important for the application needing to stabilize the output voltage; the on state of the switching tube Q2 is controlled by the output high level of V3, so that the whole circuit is ensured to normally operate when the input voltage is 220 Vac. This helps to maintain stability and reliability of the voltage regulator circuit.

In another embodiment, in the whole circuit, the single chip microcomputer control driving IC is responsible for floating driving the transistor Q2, and the current driving is replaced by the signal generator V3.

The working principle of the technical scheme is as follows: in the whole circuit, a singlechip control drive IC is responsible for floating driving of the transistor Q2, and the current driving is replaced by a signal generator.

The beneficial effects of the technical scheme are as follows: in the whole circuit, a singlechip control drive IC is responsible for floating driving of the transistor Q2, and the current driving is replaced by a signal generator.

In another embodiment, a control method of a BOOST circuit supporting a wide voltage input includes:

Wherein, the step S101 includes:

detecting the alternating current input frequency and the frequency of the alternating current power supply in real time according to a preset test operation time period, and determining the working parameters of the rectifying circuit according to the alternating current input frequency and the frequency in the test operation time period;

in the test running time period, starting a rectifying circuit, and rectifying the alternating current input of the alternating current power supply according to a full voltage state;

after the test running time period is over, when the input logic of the alternating current power supply is detected to be in a wide voltage input mode, a rectification circuit is started to rectify the alternating current input according to the determined working parameters, and the alternating current is converted into direct current output;

the rectification treatment is as follows:

when the rectifying circuit operates according to a wide voltage input mode, rectifying the alternating current input according to a standard value of high voltage rectification in a first time period;

rectifying the alternating current input according to a standard value of low-voltage rectification in a second time period;

and rectifying operation in the first time period and the second time period is circularly and reciprocally performed.

The working principle of the technical scheme is as follows: converting an alternating input voltage of an alternating current power supply into a direct current voltage by using a rectifying circuit, wherein the rectifying circuit allows current to flow in only one direction, so that the alternating current is converted into pulsating direct current; monitoring the output direct current voltage by an overvoltage protection circuit, wherein when the voltage exceeds a set threshold value, the elements change state, and a protection mechanism is triggered, such as current cutting or current diversion, so as to protect the subsequent circuit from damage; the BOOST circuit is used for boosting direct-current voltage, the switching element is periodically turned on and off, and energy is stored and released through the inductor, so that voltage is boosted.

The filter circuit is used for removing voltage fluctuation or ripple wave generated in the boosting process, smoothing voltage output, reducing noise and providing more stable direct-current voltage; and outputting the stable direct-current voltage subjected to rectification, overvoltage protection, boosting and filtering treatment to a subsequent circuit or equipment, wherein the output voltage is suitable for supplying power to various electronic equipment, and ensures that the electronic equipment can operate under stable and safe voltage.

The beneficial effects of the technical scheme are as follows: the applicability of the power supply is improved, and different alternating current power supplies can be converted into direct current voltages by the rectifying circuit, so that the power supply is suitable for different input conditions; the safety of the system is enhanced through the overvoltage protection circuit, and sensitive electronic elements are prevented from being damaged due to voltage fluctuation or abnormality; the BOOST circuit can provide stable output higher than input voltage, so as to meet the voltage requirement of specific application; the filter circuit ensures that the output voltage is smooth and has no ripple, reduces electromagnetic interference and improves the quality of a power supply and the performance of equipment; the overall circuit provides a complete power supply solution, well designed from input to output, to ensure reliability and stability of the end user device.

In another embodiment, the step S102 includes:

The working principle of the technical scheme is as follows: the output of the rectifying circuit is connected to a transistor Q2, the transistor Q2 being designed to support a high voltage input, which means that the Q2 transistor can withstand the high voltage output by the rectifying circuit without being damaged; the signal generator V3 is connected between the grid of the transistor Q2 and the cathode of the diode D7, the transistor Q2 is driven in a floating mode through the driving IC controlled by the singlechip, the floating driving means that the control end (grid) of the transistor is not directly grounded, and the switching state of the transistor is controlled through the signal generator and the driving IC, so that the accurate control of the high-voltage transistor can be realized; when the transistor Q2 is in the off state, the diode D7 allows current to flow from the anode to the cathode to form a loop, so that the voltage stability of the subsequent circuit can be maintained, and the preparation is also made for the next on period of the transistor Q2; by monitoring the voltage in the circuit and setting a preset safety range, the current is immediately cut off once the voltage is detected to be out of the range, so that damage to the subsequent circuit caused by overvoltage is prevented.

The beneficial effects of the technical scheme are as follows: the transistor Q2 supports high-voltage input, so that the rectifying circuit can stably work in a wider voltage range, and the adaptability and stability of the system are improved; the use of the signal generator V3 and the driving IC enables the control of the transistor Q2 to be more accurate, and the response speed and the switching efficiency of the circuit are improved; the loop formed by the diode D7 when the transistor Q2 is turned off is beneficial to maintaining the stability of the circuit, so that the circuit is ensured not to generate voltage fluctuation in the switching process of the transistor; by monitoring the voltage in real time and cutting off the current under abnormal conditions, the circuit damage caused by overvoltage can be effectively prevented, and the safety and reliability of the circuit are improved.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A BOOST circuit supporting a wide voltage input, comprising: the device comprises a rectifying circuit, an overvoltage protection circuit, a BOOST circuit and a filter circuit;

2. The BOOST circuit of claim 1, wherein the rectifying circuit comprises: diode D1, diode D2, diode D3, and diode D4;

3. The BOOST circuit of claim 1, wherein the overvoltage protection circuit comprises: a transistor Q2, a signal generator V3 and a diode D7;

4. The BOOST circuit of claim 1, wherein the BOOST circuit comprises: a capacitor C1, a resistor R2, an inductor L1, a diode D5 and a capacitor C2;

5. The BOOST circuit of claim 1, wherein the filter circuit comprises: a transistor Q3, a resistor R1 and a capacitor C3;

resistor R1 is used to set and adjust the operating point of transistor Q3;

6. The BOOST circuit of claim 4, wherein the BOOST circuit further comprises: a signal generator V2, a diode D8, a transistor Q1 and a voltage V2;

7. The BOOST circuit of claim 5, wherein said BOOST circuit is configured to support a wide voltage input, and wherein said BOOST circuit comprises:

8. The BOOST circuit of claim 6, wherein the single chip microcomputer control driver IC is responsible for floating driving transistor Q2, and the current driving signal generator V3 is used instead.

9. A control method of a BOOST circuit supporting a wide voltage input, characterized in that the BOOST circuit supporting a wide voltage input as claimed in any one of claims 1 to 8 performs the steps of:

10. The method for controlling a BOOST circuit supporting wide voltage input according to claim 9, wherein the step S102 comprises: