CN117040240A - Inverter circuit and inverter - Google Patents

Abstract

The application is applicable to the technical field of electronic circuits, and provides an inverter circuit and an inverter, wherein the circuit comprises: the device comprises an input module, a switch module, a transformer and a control module. The input module is used for converting direct current voltage input by a direct current source connected to the input module into first voltage according to a first control signal output by the control module; the switch module is used for adjusting the working state according to the second control signal output by the control module; the primary winding of the transformer is connected with the switch module, and the secondary winding of the transformer is used for being connected with the rectifier module and converting the first voltage into the second voltage; the control module is used for outputting a second control signal to the switch module according to the direct-current voltage so as to adjust the number of turns of the primary winding, and/or outputting a first control signal to the input module according to the direct-current voltage so as to adjust the frequency of the first voltage, so that the direct-current voltage and the number of turns of the primary winding meet a first preset condition. The application can be compatible with a plurality of input direct-current voltages with different specifications.

Description

Inverter circuit and inverter

Technical Field

The application belongs to the technical field of electronic circuits, and particularly relates to an inverter circuit and an inverter.

Background

The inverter circuit is an important component of the inverter and functions to convert direct current (which may be provided by a direct current source such as a battery, a solar panel, etc.) into alternating current. Based on the consideration of conversion efficiency, the specification of the input dc voltage supported by the current inverter circuit is usually single, that is, considering the working characteristics of certain circuit structures (such as transformers) in the inverter circuit, in order to ensure higher conversion efficiency, one inverter cannot be compatible with a plurality of input dc voltages with different specifications, so that for some application scenarios in which the input dc voltages with different specifications need to be switched and the requirements on conversion efficiency are higher, a plurality of inverters need to be configured, so that the flexibility is poor and the design cost is increased.

Disclosure of Invention

In view of the above, the embodiment of the application provides an inverter circuit and an inverter, which are used for solving the technical problem that the existing inverter circuit is difficult to be compatible with a plurality of input direct-current voltages with different specifications on the premise of ensuring higher conversion efficiency.

In a first aspect, there is provided an inverter circuit comprising:

the input module is respectively connected with the switch module and the control module and is used for connecting a direct current source and converting direct current voltage input by the direct current source into first voltage according to a first control signal output by the control module;

The switch module is respectively connected with the input module, the control module and the transformer and is used for adjusting the working state according to a second control signal output by the control module;

the transformer comprises a primary winding and a secondary winding, the primary winding is connected with the switch module, the secondary winding is used for being connected with the rectification module, and the transformer is used for converting the first voltage into the second voltage;

the control module is used for outputting the second control signal to the switch module according to the direct-current voltage so as to adjust the number of turns of the primary winding, and/or outputting the first control signal to the input module according to the direct-current voltage so as to adjust the frequency of the first voltage, so that the direct-current voltage and the number of turns of the primary winding meet a first preset condition.

In a possible implementation manner of the first aspect, the inverter circuit further includes:

the first detection module is respectively connected with the direct current source, the input module and the control module and is used for detecting the direct current voltage to obtain a first detection signal and transmitting the first detection signal to the control module;

the control module is used for outputting a corresponding second control signal according to the first detection signal so as to adjust the number of turns of the primary winding, and/or outputting a corresponding first control signal according to the first detection signal so as to adjust the frequency of the first voltage, so that the direct-current voltage and the number of turns of the primary winding meet the first preset condition.

In a possible implementation manner of the first aspect, the switching module includes a plurality of switching units, and the primary winding includes a plurality of taps;

the first end of the switch unit is connected with the input module, the second end of each switch unit is connected with the corresponding tap, and the control end of the switch unit is connected with the control module.

In a possible implementation manner of the first aspect, the inverter circuit further includes:

the rectification module is respectively connected with the secondary winding and the voltage conversion module and is used for rectifying the second voltage to obtain a third voltage;

and the voltage conversion module is used for connecting a load and converting the third voltage into alternating voltage.

In a possible implementation manner of the first aspect, the inverter circuit further includes:

the second detection module is respectively connected with the rectification module and the control module and is used for detecting the third voltage to obtain a second detection signal and transmitting the second detection signal to the control module;

the control module is further configured to adjust the first control signal according to the second detection signal, so as to adjust a pulse width of the first voltage, so that the third voltage meets a second preset condition.

In a possible implementation manner of the first aspect, the control module is connected to the voltage conversion module, and is further configured to output a third control signal to the voltage conversion module when the third voltage meets a second preset condition, so that the ac voltage meets a third preset condition.

In a possible implementation manner of the first aspect, the inverter circuit further includes:

the third detection module is respectively connected with the voltage conversion module and the control module and is used for detecting the alternating current signal output by the voltage conversion module to obtain a third detection signal, and transmitting the third detection signal to the control module, wherein the alternating current signal comprises alternating current voltage and alternating current;

the control module is further configured to stop outputting the first control signal and the third control signal when the ac voltage is greater than a first preset threshold and/or the ac current is greater than a second preset threshold.

In a possible implementation manner of the first aspect, the control module includes a first control unit and a second control unit;

the first control unit is respectively connected with the first detection module, the second detection module, the input module, the switch module and the second control unit, and is used for outputting corresponding second control signals according to the first detection signals and outputting corresponding first control signals according to the second detection signals; and outputting a start signal to the second control unit when the third voltage satisfies the second preset condition, so that the second control unit outputs the third control signal;

The second control unit is respectively connected with the third detection module and the first control unit and is used for stopping outputting the third control signal and outputting a stopping signal to the first control unit when the alternating voltage exceeds the first preset threshold value and/or the alternating current exceeds the second preset threshold value, so that the first control unit stops outputting the first control signal.

In a possible implementation manner of the first aspect, the inverter circuit further includes:

the first isolation module is respectively connected with the second detection module and the first control unit and is used for electrically isolating the second detection signal;

the second isolation module is respectively connected with the first control unit and the second control unit and is used for electrically isolating the starting signal;

and the third isolation module is respectively connected with the first control unit and the second control unit and is used for electrically isolating the stop signal.

In a possible implementation manner of the first aspect, the input module includes:

the protection unit is respectively connected with the direct current source and the voltage conversion unit and is used for realizing the electrical protection of the direct current source and the inverter circuit;

And the voltage conversion unit is connected with the switch module and used for converting the direct-current voltage into the first voltage.

In a possible implementation manner of the first aspect, the rectifying module includes a first diode, a second diode, a third diode, a fourth diode, a first inductor, a first capacitor, and a second capacitor;

the first end of the first inductor is connected with the first end of the secondary winding, the second end of the first inductor is connected with the first end of the first capacitor, the second end of the first capacitor is respectively connected with the anode of the first diode and the cathode of the third diode, the cathode of the first diode is respectively connected with the cathode of the second diode, the first end of the second capacitor and the first input end of the voltage conversion module, the anode of the second diode is respectively connected with the cathode of the fourth diode and the second end of the secondary winding, and the anode of the third diode is respectively connected with the anode of the fourth diode, the second end of the second capacitor and the second input end of the voltage conversion module.

In a possible implementation manner of the first aspect, the voltage conversion module includes a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a second inductor, a third inductor, and a third capacitor;

The first end of the first switching tube is respectively connected with the first end of the second switching tube and the first output end of the rectifying module, the second end of the first switching tube is respectively connected with the first end of the third switching tube and the first end of the second inductor, the second end of the second switching tube is respectively connected with the first end of the fourth switching tube and the first end of the third inductor, the second end of the third switching tube is respectively connected with the second end of the fourth switching tube, the second output end of the rectifying module and the ground, the control end of the first switching tube, the control end of the second switching tube, the control end of the third switching tube and the control end of the fourth switching tube are all connected with the control module, the second end of the second inductor is connected with the first end of the third capacitor and the first end used for connecting a load, and the second end used for connecting the third capacitor and the second end of the load.

In a second aspect, an embodiment of the present application further provides an inverter, where the inverter includes the inverter circuit provided in any one of the foregoing embodiments.

The inverter circuit and the inverter provided by the embodiment of the application have the following beneficial effects:

The embodiment of the application provides an inverter circuit which comprises an input module, a switch module, a transformer and a control module. The control module outputs a second control signal to the switch module according to the direct current voltage input by the direct current source so as to adjust the working state of the switch module, thereby adjusting the number of turns of the primary winding of the transformer, and/or outputs a first control signal according to the direct current voltage so as to control the frequency of the first voltage obtained by converting the direct current voltage through the input module, so that the direct current voltage and the number of turns of the primary winding of the transformer meet a first preset condition, and the conversion efficiency of the transformer is in a higher level. In other words, by the above manner, the inverter circuit can achieve higher conversion efficiency for each specification of the conversion of the input dc voltage under the application scenario of converting the input dc voltages of a plurality of different specifications.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an inverter circuit according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an inverter circuit according to another embodiment of the present application;

fig. 3 is a schematic structural diagram of an inverter circuit according to another embodiment of the present application;

fig. 4 is a schematic structural diagram of an inverter circuit according to another embodiment of the present application;

fig. 5 is a schematic structural diagram of an inverter circuit according to another embodiment of the present application;

fig. 6 is a schematic structural diagram of an inverter circuit according to another embodiment of the present application;

fig. 7 is a schematic circuit diagram of a rectifying module in an inverter circuit according to an embodiment of the application;

fig. 8 is a schematic circuit diagram of a voltage conversion module in an inverter circuit according to an embodiment of the application;

fig. 9 is a schematic circuit diagram of a voltage converting unit in an inverter circuit according to an embodiment of the application;

fig. 10 is a schematic circuit diagram of a voltage converting unit in an inverter circuit according to another embodiment of the application.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It should be noted that the terms used in the implementation section of the embodiment of the present application are only used to explain the specific embodiment of the present application, and are not intended to limit the present application. In the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; "and/or" herein is merely an association relationship describing a relationship, meaning that there may be three relationships, e.g., a and/or B, may mean: a exists alone, A and B exist together, and B exists alone.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. The terms "comprising," including, "" having, "and variations thereof mean" including but not limited to.

The inverter circuit is an important component of an inverter for converting direct current (which may be provided by a direct current source such as a battery, a solar panel, etc.) into alternating current. Based on the consideration of conversion efficiency, the specification of the input dc voltage supported by the current inverter circuit is usually single, that is, in consideration of the working characteristics of certain circuit structures (such as transformers) in the inverter circuit, in order to ensure higher conversion efficiency, one inverter cannot be compatible with a plurality of input dc voltages with different specifications, so that for some application scenarios (such as photovoltaic power generation systems, vehicle-mounted equipment with inverters of different vehicle types, and the like) requiring higher conversion efficiency, a plurality of inverters need to be configured, so that flexibility is poor and design cost is increased.

In order to solve the above problems, an embodiment of the present application provides an inverter circuit and an inverter, which enable the inverter circuit to achieve higher conversion efficiency for each specification of input dc voltage under the application scenario of converting a plurality of different specifications of input dc voltages.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an inverter circuit according to an embodiment of the present application. As shown in fig. 1, the inverter circuit 10 includes an input module 101, a switch module 102, a transformer 103, and a control module 104.

The input module 101 is connected to the switch module 102 and the control module 104, and is used for connecting the dc source 20, and is used for converting the dc voltage input by the dc source 20 into a first voltage according to a first control signal output by the control module 104, where the first voltage includes, but is not limited to, a square wave type voltage, a sine wave type voltage, and the like.

The switch module 102 is respectively connected to the input module 101, the transformer 103 and the control module 104, and is used for adjusting the working state according to the second control signal output by the control module 104. The switching module 102 adjusts the working state thereof, so that the number of turns of the primary winding of the transformer 103 which is connected with the input module 101 in an electrical connection relationship through the switching module 102 is different, and thus, the direct current voltage with different specifications is adapted.

The transformer 103 includes a primary winding and a secondary winding, the primary winding of the transformer 103 is connected to the switch module 102, the secondary winding of the transformer 103 is connected to the rectifier module 105, the transformer 103 is configured to convert the first voltage obtained by converting the input module 101 into a second voltage, so as to implement voltage level conversion (such as voltage boosting or voltage reducing), and the second voltage is output to a rear stage after rectifying by the rectifier module 105.

The control module 104 is configured to output a second control signal to the switch module 102 according to the above-mentioned dc voltage, so as to adjust the number of turns of the primary winding of the transformer 103, and/or output a first control signal to the input module 101 according to the above-mentioned dc voltage, so as to adjust the frequency of the first voltage output by the input module 101, thereby implementing adjustment of the operating frequency of the transformer 103, so that the above-mentioned dc voltage and the number of turns of the primary winding of the transformer meet a first preset condition. The dc voltage may be obtained by detecting the dc voltage by an external voltage detecting device or a voltage detecting unit built in the control module 104. It should be noted that the first preset condition refers to a mathematical relationship between the number of turns of the primary winding of the transformer and the input voltage (the value of the input voltage is similar to the value of the dc voltage) of the primary winding of the input transformer, which is set based on the design principle of the number of turns of the primary winding of the transformer so that the conversion efficiency of the transformer reaches the target conversion efficiency. The target conversion efficiency may be set according to the actual application scenario, and may be set to 90% or more, for example. Specifically, in order to make the conversion efficiency of the transformer reach a higher level (the conversion efficiency of a general power transformer can reach more than 90% under the condition that the working condition and the working performance are good, therefore, in the embodiment of the application, when the conversion efficiency of the transformer is greater than 90%, the conversion efficiency is considered to be at a higher level), the relationship between the number of turns of the primary winding of the transformer and the input voltage of the input transformer should be as follows:

Wherein N is the number of turns connected to the primary winding of the transformer, k is the ratio of the maximum conduction time to the period (generally taken as 0.4), U is the input voltage (unit: V) of the primary winding of the transformer, f is the working frequency (unit: KHz) of the transformer, and Ae is the cross-sectional area (unit: cm) of the magnetic core of the transformer ² ) Bmax is the maximum variation amplitude of the magnetic flux density allowed by the transformer (unit: g) A. The invention relates to a method for producing a fibre-reinforced plastic composite

When the magnetic core of the transformer is selected, the cross-sectional area Ae of the magnetic core of the transformer and the maximum variation amplitude Bmax of the magnetic flux density allowed by the transformer are determined, and as can be seen from the above formula (1), when the magnetic core of the transformer is selected, the turn-in number of the primary winding of the transformer is proportional to the input voltage of the primary winding of the transformer and inversely proportional to the operating frequency of the transformer, that is, when the input voltage of the primary winding of the transformer is determined, the turn-in number of the primary winding of the transformer and/or the operating frequency of the transformer can be adjusted to make the turn-in number of the primary winding of the transformer and the input voltage of the primary winding of the transformer meet the above formula (1) (i.e. the first preset condition), so that the conversion efficiency of the transformer can reach a higher level. Therefore, in the application scenario of converting the input direct-current voltages with different specifications, according to the detected value of the input direct-current voltage, the number of turns of the primary winding of the transformer and/or the working frequency of the transformer are dynamically adjusted, so that the number of turns of the primary winding of the transformer and the input voltage of the primary winding of the transformer meet the formula (1), and the conversion of the input direct-current voltage with each specification can achieve higher conversion efficiency.

In addition, according to the working characteristics of the transformer, the working frequency of the transformer can be controlled within a proper range (such as 10 KHz-50 KHz) to ensure that the transformer is in a relatively stable working state. The reason is that when the working frequency of the transformer is too low, the change rate of magnetic flux of the transformer is reduced, so that the primary winding and the secondary winding of the transformer cannot be effectively magnetically coupled, the inductance is reduced, the iron loss is increased, the no-load loss of the primary winding is increased, and the iron core heats up to burn the transformer; if the working frequency of the transformer is too high, the inductance of the transformer is increased, the winding current is reduced, the induction voltage of the secondary winding is correspondingly reduced, and the internal resistance of the power supply is increased, so that the transformer cannot work normally.

The inverter circuit 10 shown in fig. 1 operates as follows:

when the inverter circuit 10 is switched from the power-off state to the power-on start state, a first control signal is output to the input module 101 through the control module 104, so that the frequency of the first voltage converted by the input module 101 is at a preset frequency value (generally, a lower operating frequency threshold or an intermediate value between an upper operating frequency threshold and an upper operating frequency threshold of the transformer may be selected), and according to the value of the dc voltage input by the dc source 20 detected in real time, a second control signal is output to the switch module 102 through the control module 104, and the working state of the switch module 102 is adjusted, so that the number of turns of the primary winding of the transformer 103 and the dc voltage meet the first preset condition, thereby making the transformer 103 have a higher conversion efficiency.

In the working process of the inverter circuit 10, the value of the direct current voltage input by the direct current source 20 is detected in real time, if the value is not equal to the value at the time of starting immediately before power-on, the value indicates that the energy of the direct current source 20 is lost or is switched to a direct current source with different specifications, if the frequency of the first voltage is still within the preset working frequency range of the transformer 103 at this time, the first control signal can be preferentially selected and adjusted to adjust the frequency of the first voltage, so that the number of turns of the primary winding of the transformer 103 connected with the direct current voltage always meets the first preset condition, that is, when the frequency of the first voltage is still within the preset working frequency range of the transformer 103, the number of turns of the primary winding of the transformer 103 connected with the direct current voltage always meets the first preset condition only by adjusting the frequency of the first voltage, and the working state of the switch module 102 is not adjusted, thereby reducing the switching loss caused by switching of the switch device in the switch module 102; when the frequency of the first voltage is already at the upper limit threshold or the lower limit threshold of the working frequency of the transformer 103, the working state of the switch module 102 is adjusted to adjust the number of turns of the primary winding of the transformer 103, so that the number of turns of the primary winding of the transformer 103 and the direct current voltage always meet the first preset condition, and the conversion efficiency of the transformer 103 is ensured to be at a higher level.

In other embodiments, the number of turns of the primary winding of the transformer 103 and the dc voltage may always satisfy the first preset condition by adjusting only the number of turns of the primary winding of the transformer 103, adjusting only the operating frequency of the transformer 103, or adjusting both the number of turns of the primary winding of the transformer 103 and the operating frequency (e.g. increasing the number of turns of the primary winding of the transformer 103 and decreasing the operating frequency of the transformer 103).

It should be noted that, by changing the number of turns of the primary winding of the transformer 103, the turns ratio of the primary winding and the secondary winding of the transformer 103 meets the preset requirement, so that the method of adapting to the input dc voltage with different specifications can adapt to more input dc voltages with different specifications on the premise of ensuring that the transformer 103 has higher conversion efficiency compared with the method of changing the number of turns of the secondary winding of the transformer 103. The reason is that, in consideration of the operating state and conversion efficiency of the transformer 103, the operating frequency of the transformer 103 needs to be selected in a proper range, and when the number of turns of the primary winding of the transformer 103 is fixed (i.e. the turns ratio of the primary winding and the secondary winding is adjusted by adjusting the number of turns of the secondary winding of the transformer 103), the range of the adaptable input dc voltage is completely dependent on the range of the operating frequency of the transformer 103, however, according to the prior art, the range of the operating frequency of the transformer 103 cannot be selected too wide (typically 10KHz to 50 KHz). Therefore, in an embodiment of the present application, by combining the number of turns of the primary winding of the transformer 103 with the operating frequency of the transformer 103, the range of the input dc voltage that can be adapted is necessarily larger than the operating frequency of the transformer 103.

The following describes the operation of the inverter circuit 10 in a specific embodiment:

in this example, the number of turns N of the primary winding of the transformer 103 is selected to be 2, 3 or 4, and the cross-sectional area Ae of the transformer core is 1.96cm ² The maximum variation amplitude Bmax of the magnetic flux density allowed by the transformer is 3200G, the ratio k of the maximum conduction time to the period is taken to be 0.4, and the working frequency of the transformer 103 is selected to be 20 KHz-40 KHz in consideration of the working characteristics of the transformer 103 and the switching loss limit of switching devices in each module.

When the inverter circuit 10 is powered on and started, assuming that the value of the detected dc voltage input by the dc source 20 is 9V, at this time, the frequency of the first voltage is set to 20KHz, according to the above formula (1), it can be calculated that the number of turns N to be connected to the primary winding of the transformer 103 is 2.87 in theory, and in order to have a certain redundancy, the number of turns N of the primary winding of the transformer 103 can be taken to be 3; during the operation of the inverter circuit 10, the value of the dc voltage input by the dc source 20 is detected in real time, and when the value changes, for example, from 9V to 10V, since the frequency of the first voltage is 20KHz and does not reach the upper threshold of the operating frequency of the transformer 103, the number of turns of the primary winding of the transformer 103 and the dc voltage can be made to satisfy the first preset condition, that is, the above formula (1), by adjusting the frequency of the first voltage from 20KHz to 21.26 KHz.

When the number of turns N of the primary winding of the transformer 103 is 3 and remains unchanged, theoretically, since the frequency range of the first voltage is 20 KHz-40 KHz, the specification of the adaptable dc voltage in this application scenario is about 9.4V-18.8V. If the real-time detected dc voltage is lower than 9.4V, for example 8V, and the frequency of the first voltage is reduced to 20KHz, which is the lower threshold of the working frequency of the transformer 103, and the requirement cannot be met, the number of turns N of the primary winding of the transformer 103 is switched to 2, and the frequency of the first voltage is increased from 20KHz to 25.5KHz, so that the requirement can be basically met; when the dc voltage is higher than 18.8V, for example, 24V, the frequency of the first voltage is raised to the upper threshold 40KHz of the working frequency of the transformer 103, and the requirement cannot be met, the number of turns N of the primary winding of the transformer 103 is switched to 4, and the frequency of the first voltage is reduced from 40KHz to 38.26KHz, so that the requirement can be basically met. That is, by adjusting the number of turns of the primary winding of the transformer 103 and/or the operating frequency of the transformer 103, the number of turns of the primary winding of the transformer 103 and the dc voltage can be made to satisfy the first preset condition.

As can be seen from the foregoing, in the inverter circuit 10 provided in the embodiment of the present application, the control module 104 can output the second control signal to the switch module 102 according to the dc voltage input by the dc source to adjust the working state of the switch module 102, thereby adjusting the number of turns of the primary winding of the transformer 103, and/or output the first control signal to the input module 101 according to the dc voltage, so as to adjust the frequency of the first voltage obtained by converting the dc voltage by the input module 101, and make the dc voltage and the number of turns of the primary winding of the transformer 103 meet the first preset condition, thereby making the conversion efficiency of the transformer 103 be at a higher level. That is, in the above manner, the inverter circuit 10 can achieve higher conversion efficiency for each specification of the conversion of the input dc voltage under the application scenario of converting the input dc voltages of a plurality of different specifications.

Referring to fig. 2, in some embodiments, the inverter circuit 10 may further include a first detection module 106. The first detection module 106 is connected to the input module 101 and the control module 104, and is configured to detect the dc voltage input by the dc source 20, obtain a first detection signal, and transmit the first detection signal to the control module 104.

The control module 104 is configured to obtain the value of the dc voltage according to the first detection signal, and output a corresponding second control signal to the switch module 102 to adjust the number of turns of the primary winding of the transformer 103, and/or obtain the value of the dc voltage according to the first detection signal, and output a corresponding first control signal to the input module 101 to adjust the frequency of the first voltage obtained by the conversion of the input module 101, so that the dc voltage and the number of turns of the primary winding of the transformer 103 meet the first preset condition.

In some embodiments, referring to fig. 3, the switch module 102 includes a plurality of switch units 1021 and the primary winding of the transformer 103 includes a plurality of taps.

A first end of the switch units 1021 is connected to the input module 101, and a second end of each switch unit 1021 is connected to a tap of a primary winding of the corresponding transformer 103, and a control end of the switch units 1021 is connected to the control module 104.

The control module 104 outputs a corresponding second control signal to the switch module 102 according to the detected value of the dc voltage input by the dc source 20, so that the corresponding switch unit 1021 in the switch module 102 is turned on, and the rest of the switch units 1021 are turned off, so as to adjust the number of turns of the primary winding of the transformer 103, so that the dc voltage and the number of turns of the primary winding of the transformer 103 meet the first preset condition.

In some embodiments, referring again to fig. 2, the inverter circuit 10 may further include a rectifying module 105 and a voltage conversion module 107.

The rectifying module 105 is respectively connected with the secondary winding of the transformer 103 and the voltage conversion module 107, and is used for rectifying the second voltage output by the transformer 103 to obtain a third voltage; the voltage conversion module 107 is configured to be connected to the load 30, and is configured to convert the third voltage into an ac voltage, thereby supplying power to the load 30.

In some embodiments, referring again to fig. 2, the inverter circuit 10 may further include a second detection module 108.

The second detection module 108 is connected to the rectification module 105 and the control module 104, and is configured to detect the third voltage output by the rectification module 105, obtain a second detection signal, and transmit the second detection signal to the control module 104.

The control module 104 is further configured to obtain a value of the third voltage according to the second detection signal, and adjust the first control signal to adjust a pulse width of the first voltage output by the input module 101 (e.g., when the type of the first voltage is a square wave, a duty cycle of the square wave is correspondingly adjusted) so that the third voltage meets a second preset condition, where the second preset condition may be that the third voltage is always in dynamic balance, i.e., the value of the third voltage is always dynamically maintained at a preset voltage value, such as 260V.

In some embodiments, referring to fig. 2 again, the control module 104 is further connected to the voltage conversion module 107, and when the third voltage output by the rectifying module 105 meets the second preset condition (for example, the value of the third voltage is a preset voltage value), the control module 104 is further configured to output a third control signal to the voltage conversion module 107 so that the ac voltage output by the voltage conversion module 107 meets the third preset condition, where the third preset condition may be that the value of the ac voltage output by the voltage conversion module 107 is a preset voltage value, for example, an ac voltage of 220V. The third preset condition may be set according to the actual electricity demand of the load 30, which is not limited herein.

In some embodiments, referring again to fig. 2, the inverter circuit 10 may further include a third detection module 109.

The third detection module 109 is connected to the voltage conversion module 107 and the control module 104, and is configured to detect the ac electrical signal output by the voltage conversion module 107, obtain a third detection signal, and transmit the third detection signal to the control module 104, where the ac electrical signal may include, but is not limited to, an ac voltage and an ac current.

The control module 104 is further configured to stop outputting the first control signal and the third control signal when the ac voltage is greater than a first preset threshold (i.e., overvoltage) and/or the ac current is greater than a second preset threshold (i.e., overcurrent), that is, the input module 101 and the voltage conversion module 107 of the inverter circuit 10 stop working, so as to prevent damage to the load 30.

In some embodiments, referring to fig. 4, the control module 104 includes a first control unit 1041 and a second control unit 1042.

The first control unit 1041 is respectively connected to the first detection module 106, the second detection module 108, the switch module 102 and the second control unit 1042, and is configured to output a corresponding second control signal to the switch module 102 according to the first detection signal, and output a corresponding first control signal to the input module 101 according to the second detection signal, so that the dc voltage input by the dc source 20 and the number of turns of the primary winding of the transformer 103 meet the first preset condition, and the third voltage output by the rectifying module 105 meets the second preset condition; and is configured to output a start signal to the second control unit 1042 when the third voltage meets the second preset condition, so that the second control unit 1042 outputs a corresponding third control signal to the voltage conversion module 107, and the ac voltage output by the voltage conversion module 107 meets the preset third condition.

The second control unit 1042 is connected to the third detection module 109 and the first control unit 1041, respectively, and configured to stop outputting the third control signal to the voltage conversion module 107 when the ac voltage output by the voltage conversion module 107 exceeds the first preset threshold and/or the ac current exceeds the second preset threshold, so as to stop the voltage conversion module 107, and output the stop signal to the first control unit 1041, so that the first control unit 1041 stops outputting the first control signal to the input module 101, so as to stop the input module 101.

The first control unit 1041 and the second control unit 1042 may include, but are not limited to, an MCU (Microcontroller Unit, microcontroller), a DSP (Digital Signal Processing ) chip, and the like.

In some embodiments, referring to fig. 5, the inverter circuit 10 further includes a first isolation module 110, a second isolation module 111, and a third isolation module 112.

The first isolation module 110 is respectively connected to the second detection module 108 and the first control unit 1041, and is configured to electrically isolate the second detection signal; the second isolation module 111 is connected to the first control unit 1041 and the second control unit 1042, respectively, and is used for electrically isolating the start signal; the third isolation module 112 is connected to the first control unit 1041 and the second control unit 1042, respectively, and is used for electrically isolating the stop signal. The first, second and third isolation modules 110, 111 and 112 may include, but are not limited to, optocouplers, transformers, etc.

In some embodiments, referring to fig. 6, the input module 101 includes a protection unit 1011 and a voltage conversion unit 1012.

The protection unit 1011 is connected to the dc source 20 and the voltage conversion unit 1012, respectively, for realizing electrical protection of the dc source 20 and the inverter circuit 10. The protection unit 1011 may include, but is not limited to, components, circuit structures, or devices having an electrical protection function against reverse connection, overheat, overvoltage, overcurrent, and the like.

The voltage conversion unit 1012 is connected to the switch module 102, and is configured to convert the dc voltage input by the dc source 20 into the first voltage. The voltage conversion unit 1012 may include, but is not limited to, a full bridge inverter circuit, a half bridge inverter circuit, a push-pull resonant drive circuit, a flyback drive circuit, and the like.

In some embodiments, referring to fig. 7, fig. 7 shows a circuit structure of a rectifying module. In the embodiment shown in fig. 6, the rectifying module 105 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first inductor L1, a first capacitor C1, and a second capacitor C2.

The first end of the first inductor L1 is connected to the first end of the secondary winding of the transformer 103, the second end of the first inductor L1 is connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is connected to the anode of the first diode D1 and the cathode of the third diode D3, the cathode of the first diode D1 is connected to the cathode of the second diode D2, the first end of the second capacitor C2 and the first input end of the voltage conversion module 107, the anode of the second diode D2 is connected to the cathode of the fourth diode D4 and the second end of the secondary winding of the transformer 103, and the anode of the third diode D3 is connected to the anode of the fourth diode D4, the second end of the second capacitor C2 and the second input end of the voltage conversion module 107.

The rectifier module 105 in the embodiment shown in fig. 7 operates as follows:

the second voltage output by the transformer 103 is first filtered by an LC filter formed by the first inductor L1 and the first capacitor C1, then filtered again by a full-wave rectifier bridge formed by the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4, and finally filtered again by the second capacitor C2, thereby obtaining a third voltage (dc voltage) with smaller ripple.

In some embodiments, referring to fig. 8, fig. 8 illustrates a circuit structure of the voltage conversion module 107. In the embodiment shown in fig. 8, the voltage conversion module 107 includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a second inductor L2, a third inductor L3, and a third capacitor C3.

The first end of the first switching tube Q1 is respectively connected with the first end of the second switching tube Q2 and the first output end of the rectifying module 105, the second end of the first switching tube Q1 is respectively connected with the first end of the third switching tube Q3 and the first end of the second inductor L2, the second end of the second switching tube Q2 is respectively connected with the first end of the fourth switching tube Q4 and the first end of the third inductor L3, the second end of the third switching tube Q3 is respectively connected with the second end of the fourth switching tube Q4, the second output end of the rectifying module 105 and the ground, the control end of the first switching tube Q1, the control end of the second switching tube Q2, the control end of the third switching tube Q3 and the control end of the fourth switching tube Q4 are all connected with the control module 104, the second end of the second inductor L2 is connected with the first end of the third capacitor C3 and the first end used for connecting the load 30, and the second end used for connecting the third capacitor C3 with the second end of the third inductor L3.

The voltage conversion module 107 in the embodiment shown in fig. 8 operates as follows:

the third voltage output by the rectifying module 105 is transformed by a full-bridge inverter circuit structure formed by the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the four switching tubes Q4, specifically, in the full-bridge inverter circuit structure, the third control signals (i.e., SPWM1, SPWM2, SPWM3 and SPWM 4) output by the control module 104 control the working states (on or off) of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the four switching tube Q4, so as to output a voltage in a corresponding square wave form, and the voltage in a square wave form outputs an alternating voltage in a sine wave form after passing through an LC filter circuit structure formed by the second inductor L2, the third inductor L3 and the third capacitor C3, thereby supplying power to the load 30.

The types of the first switching tube Q1, the second switching tube Q2, the third switching tube Q3, and the fourth switching tube Q4 in the embodiment shown in fig. 8 are all NMOS tubes, wherein the first end of the switching tube corresponds to the drain electrode of the NMOS tube, the second end of the switching tube corresponds to the source electrode of the NMOS tube, and the control end of the switching tube corresponds to the gate electrode of the NMOS tube. That is, the switching tube is turned on when the control terminal of the switching tube is at a high level, and is turned off when the control terminal of the switching tube is at a low level. The SPWM1, SPWM2, SPWM3 and SPWM4 are all sine wave pulse width modulation signals, and in one signal period, the sine wave pulse width modulation signals comprise two states of high level and low level, when the sine wave pulse width modulation signals are in the high level state, the corresponding switching tube can be controlled to be turned on, and when the sine wave pulse width modulation signals are in the low level state, the corresponding switching tube is controlled to be turned off. In the embodiment shown in fig. 8, the operating state of the first switching tube Q1 is adjusted by adjusting the frequency and/or the pulse width of the SPWM1, the operating state of the second switching tube Q2 is adjusted by adjusting the frequency and/or the pulse width of the SPWM2, the operating state of the third switching tube Q3 is adjusted by adjusting the frequency and/or the pulse width of the SPWM3, and the operating state of the fourth switching tube Q4 is adjusted by adjusting the frequency and/or the pulse width of the SPWM4, so that the ac voltage output by the voltage conversion module 107 meets the preset requirement, for example, the ac voltage output by the voltage conversion module 107 is in the form of a sine wave of 220V.

In some embodiments, referring to fig. 9, fig. 9 shows a circuit structure of the voltage conversion unit 1012 and the switch module 102. In the embodiment shown in fig. 9, the voltage converting unit 1012 includes a fifth switching tube Q5 and a sixth switching tube Q6, and the switching module 102 includes two switching units 1021, i.e., a first switch S1 and a second switch S2. It should be noted that, for convenience of explanation of the working principle, in the embodiment shown in fig. 9, the number of the access turns of the primary winding of the transformer 103 is selected to be two, and in other embodiments, the number of the access turns of the primary winding of the transformer 103 may be set to be different numbers of groups (for example, three groups, five groups, ten groups, etc.) according to actual design requirements, which is not limited herein, wherein the larger the number of the groups is, the larger the range of the specification of the adapted dc voltage is.

The voltage conversion unit 1012 in the embodiment shown in fig. 9 operates as follows:

the fifth switching tube Q5 and the sixth switching tube Q6 form a push-pull resonant driving circuit structure, and the push-pull resonant driving circuit structure adjusts the on-off frequency of the fifth switching tube Q5 and the sixth switching tube Q6 according to the first control signals (i.e., PWM1 and PWM 2) output by the control module 104 to adjust the operating frequency of the transformer 103, and adjusts the on-off time of the fifth switching tube Q5 and the sixth switching tube Q6 to adjust the level of the output voltage (i.e., the third voltage) of the transformer 103.

The fifth switching tube Q5 and the sixth switching tube Q6 in the embodiment shown in fig. 9 are NMOS tubes, where the first end of the switching tube corresponds to the drain electrode of the NMOS tube, the second end of the switching tube corresponds to the source electrode of the NMOS tube, and the control end of the switching tube corresponds to the gate electrode of the NMOS tube. That is, the switching tube is turned on when the control terminal of the switching tube is at a high level, and is turned off when the control terminal of the switching tube is at a low level. The PWM1 and PWM2 are pulse width modulation signals, and in one signal period, the pulse width modulation signals include two states of high level and low level, when the pulse width modulation signals are in the high level state, the corresponding switching tube is controlled to be turned on, and when the pulse width modulation signals are in the low level state, the corresponding switching tube is controlled to be turned off. In the embodiment shown in fig. 9, the operating state of the fifth switching tube Q5 is adjusted by adjusting the frequency and/or the pulse width of the PWM1, and the operating state of the sixth switching tube Q6 is adjusted by adjusting the frequency and/or the pulse width of the PWM2, so that the operating frequency and the output voltage level of the transformer 103 meet the preset requirements, for example, the operating frequency of the transformer 103 is 20KHz, and the output voltage level of the transformer 103 is 260V.

The switching module 102 in the embodiment shown in fig. 9 operates as follows:

The first switch S1 and the second switch S2 adjust the working state according to the second control signal (i.e., CON1 and CON 2) output by the control module 104, so that when the movable contact 1 of the first switch S1 is connected to the normally closed fixed contact 3 thereof, the movable contact 1 of the second switch S2 is connected to the normally closed fixed contact 3 thereof, or so that when the movable contact 1 of the first switch S1 is connected to the normally open fixed contact 2 thereof, the movable contact 1 of the second switch S2 is connected to the normally open fixed contact 2 thereof, thereby realizing the adjustment of the turn number of the primary winding of the transformer 103.

The first switch S1 and the second switch S2 are switch units 1021 formed by an armature and a contact thereof of an electromagnetic relay, wherein the first switch S1 includes the armature, the movable contact 1, the normally open stationary contact 2 and the normally closed stationary contact 3, the second switch S2 includes the armature, the movable contact 1, the normally open stationary contact 2 and the normally closed stationary contact 3, a coil of the electromagnetic relay is powered when a working state selection signal of the electromagnetic relay is at a high level, a signal CON1 is a working state selection signal of the electromagnetic relay to which the first switch S1 belongs, and a signal CON2 is a working state selection signal of the electromagnetic relay to which the second switch S2 belongs.

When the signal CON1 is at a high level, the movable contact 1 of the first switch S1 is connected to the normally open stationary contact 2, when the signal CON1 is at a low level, the movable contact 1 of the first switch S1 is connected to the normally closed stationary contact 3, when the signal CON2 is at a high level, the movable contact 1 of the second switch S2 is connected to the normally open stationary contact 2, and when the signal CON2 is at a low level, the movable contact 1 of the second switch S2 is connected to the normally closed stationary contact 3. The control module 104 adjusts the level states of the signal CON1 and the signal CON2, so that when the signal CON1 is at a low level and the signal CON2 is at a low level, the movable contact 1 of the first switch S1 is connected to the normally closed stationary contact 3 thereof, and the movable contact 1 of the second switch S2 is connected to the normally closed stationary contact 3 thereof, or when the signal CON1 is at a high level and the signal CON2 is at a high level, the movable contact 1 of the first switch S1 is connected to the normally open stationary contact 2 thereof, and the movable contact 1 of the second switch S2 is connected to the normally open stationary contact 2 thereof, thereby realizing adjustment of the turn number of the primary winding of the transformer 103.

It will be appreciated that the above is only an exemplary description of the signals CON1 and CON2, and based on the selection of the circuit device and the design of the circuit structure, it is also possible that the movable contact 1 of the first switch S1 is connected to its normally closed stationary contact 3 when the signal CON1 is at a high level, the movable contact 1 of the first switch S1 is connected to its normally open stationary contact 2 when the signal CON1 is at a low level, the movable contact 1 of the second switch S2 is connected to its normally closed stationary contact 3 when the signal CON2 is at a high level, and the movable contact 1 of the second switch S2 is connected to its normally open stationary contact 2 when the signal CON2 is at a low level.

In some embodiments, referring to fig. 10, fig. 10 illustrates another circuit structure of the voltage conversion unit 1012 and the switch module 102. In the embodiment shown in fig. 10, the voltage converting unit 1012 includes a seventh switching tube Q7, an eighth switching tube Q8, a fourth capacitor C4 and a fifth capacitor C5, and the switching module 102 includes two switching units 1021, namely a third switch S3 and a fourth switch S4. It should be noted that, for convenience of explanation of the working principle, in the embodiment shown in fig. 10, the number of turns of the primary winding of the transformer 103 is two, and in other embodiments, the number of turns of the primary winding of the transformer 103 may be set to be different numbers of groups (for example, three groups, five groups, ten groups, etc.) according to actual design requirements, which is not limited herein, wherein the larger the number of the groups is, the larger the range of the specification of the adapted dc voltage is.

The operation principle of the voltage converting unit 1012 in the embodiment shown in fig. 10 is as follows:

the seventh switching tube Q7, the eighth switching tube Q8, the fourth capacitor C4 and the fifth capacitor C5 form a circuit structure of a half-bridge inverter, and the circuit structure of the half-bridge inverter adjusts the on-off frequency of the seventh switching tube Q7 and the eighth switching tube Q8 according to the first control signals (i.e., PWM3 and PWM 4) output by the control module 104 to adjust the working frequency of the transformer 103, and adjusts the on-off time of the seventh switching tube Q7 and the eighth switching tube Q8 to adjust the level of the output voltage (i.e., the third voltage) of the transformer 103.

The seventh switching tube Q7 and the eighth switching tube Q8 in the embodiment shown in fig. 10 are NMOS tubes, where the first end of the switching tube corresponds to the drain electrode of the NMOS tube, the second end of the switching tube corresponds to the source electrode of the NMOS tube, and the control end of the switching tube corresponds to the gate electrode of the NMOS tube. That is, the switching tube is turned on when the control terminal of the switching tube is at a high level, and is turned off when the control terminal of the switching tube is at a low level. The PWM1 and PWM2 are pulse width modulation signals, and in one signal period, the pulse width modulation signals include two states of high level and low level, when the pulse width modulation signals are in the high level state, the corresponding switching tube is controlled to be turned on, and when the pulse width modulation signals are in the low level state, the corresponding switching tube is controlled to be turned off. In the embodiment shown in fig. 10, the operating state of the fifth switching tube Q5 is adjusted by adjusting the frequency and/or the pulse width of the PWM3, and the operating state of the sixth switching tube Q6 is adjusted by adjusting the frequency and/or the pulse width of the PWM4, so that the operating frequency and the output voltage level of the transformer 103 meet the preset requirements, for example, the operating frequency of the transformer 103 is 20KHz, and the output voltage level of the transformer 103 is 260V.

The switching module 102 in the embodiment shown in fig. 10 operates as follows:

the third switch S3 and the fourth switch S4 adjust the working state according to the second control signal (i.e., CON3 and CON 4) output by the control module 104, so that when the third switch S3 is turned on, the fourth switch S4 is turned off; alternatively, when the third switch S3 is turned off, the fourth switch S4 is turned on. Thereby achieving the adjustment of the number of access turns of the primary winding of the transformer 103.

The third switch S3 and the fourth switch S4 are switch units 1021 formed by an armature and a contact thereof of the electromagnetic relay, wherein the third switch S3 includes the armature, the movable contact 1 and the normally open stationary contact 2, the fourth switch S4 includes the armature, the movable contact 1 and the normally open stationary contact 2, a coil of the electromagnetic relay is powered when an operation state selection signal of the electromagnetic relay is at a high level, a signal CON3 is an operation state selection signal of the electromagnetic relay to which the third switch S3 belongs, and a signal CON4 is an operation state selection signal of the electromagnetic relay to which the fourth switch S4 belongs.

When the signal CON3 is at a high level, the movable contact 1 of the third switch S3 is connected to the normally open fixed contact 2 thereof, when the signal CON3 is at a low level, the movable contact 1 of the third switch S3 is disconnected from the normally open fixed contact 2 thereof, when the signal CON4 is at a high level, the movable contact 1 of the fourth switch S4 is connected to the normally open fixed contact 2 thereof, and when the signal CON4 is at a low level, the movable contact 1 of the fourth switch S4 is disconnected from the normally open fixed contact 2 thereof. The control module 104 adjusts the level states of the signal CON3 and the signal CON4, so that when the signal CON3 is at a high level and the signal CON4 is at a low level, the movable contact 1 of the third switch S3 is connected to the normally open fixed contact 2 thereof, and the movable contact 1 of the fourth switch S4 is disconnected from the normally open fixed contact 2 thereof, or when the signal CON3 is at a low level and the signal CON4 is at a high level, the movable contact 1 of the fourth switch S4 is connected to the normally open fixed contact 2 thereof, and the movable contact 1 of the third switch S3 is disconnected from the normally open fixed contact 2 thereof, thereby realizing adjustment of the number of turns of access of the primary winding of the transformer 103.

It will be appreciated that the above is only an exemplary description of the signal CON3 and the signal CON4, and by selecting a circuit device and designing a circuit structure, it is also possible that the movable contact 1 of the third switch S3 is connected to the normally open fixed contact 2 thereof when the signal CON3 is at a low level, the movable contact 1 of the third switch S3 is disconnected from the normally open fixed contact 2 thereof when the signal CON3 is at a high level, the movable contact 1 of the fourth switch S4 is connected to the normally open fixed contact 2 thereof when the signal CON4 is at a low level, and the movable contact 1 of the fourth switch S4 is disconnected from the normally open fixed contact 2 thereof when the signal CON4 is at a high level.

The embodiment of the present application further provides an inverter, which includes the inverter circuit 10 provided in any of the above embodiments, for converting an input dc voltage into an ac voltage and outputting the ac voltage.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims (13)

1. An inverter circuit, comprising:

the input module is respectively connected with the switch module and the control module and is used for connecting a direct current source and converting direct current voltage input by the direct current source into first voltage according to a first control signal output by the control module;

the switch module is respectively connected with the input module, the control module and the transformer and is used for adjusting the working state according to a second control signal output by the control module;

the transformer comprises a primary winding and a secondary winding, the primary winding is connected with the switch module, the secondary winding is used for being connected with the rectification module, and the transformer is used for converting the first voltage into the second voltage;

the control module is used for outputting the second control signal to the switch module according to the direct-current voltage so as to adjust the number of turns of the primary winding, and/or outputting the first control signal to the input module according to the direct-current voltage so as to adjust the frequency of the first voltage, so that the direct-current voltage and the number of turns of the primary winding meet a first preset condition.

2. The inverter circuit according to claim 1, further comprising:

The first detection module is respectively connected with the direct current source, the input module and the control module and is used for detecting the direct current voltage to obtain a first detection signal and transmitting the first detection signal to the control module;

the control module is used for outputting a corresponding second control signal according to the first detection signal so as to adjust the number of turns of the primary winding, and/or outputting a corresponding first control signal according to the first detection signal so as to adjust the frequency of the first voltage, so that the direct-current voltage and the number of turns of the primary winding meet the first preset condition.

3. The inverter circuit of claim 1, wherein the switching module comprises a plurality of switching cells and the primary winding comprises a plurality of taps;

the first end of the switch unit is connected with the input module, the second end of each switch unit is connected with the corresponding tap, and the control end of the switch unit is connected with the control module.

4. The inverter circuit according to claim 2, further comprising:

the rectification module is respectively connected with the secondary winding and the voltage conversion module and is used for rectifying the second voltage to obtain a third voltage;

And the voltage conversion module is used for connecting a load and converting the third voltage into alternating voltage.

5. The inverter circuit of claim 4, further comprising:

the second detection module is respectively connected with the rectification module and the control module and is used for detecting the third voltage to obtain a second detection signal and transmitting the second detection signal to the control module;

the control module is further configured to adjust the first control signal according to the second detection signal, so as to adjust a pulse width of the first voltage, so that the third voltage meets a second preset condition.

6. The inverter circuit of claim 5, wherein the control module is coupled to the voltage conversion module and is further configured to output a third control signal to the voltage conversion module to cause the ac voltage to satisfy a third preset condition when the third voltage satisfies the second preset condition.

7. The inverter circuit of claim 6, further comprising:

the third detection module is respectively connected with the voltage conversion module and the control module and is used for detecting the alternating current signal output by the voltage conversion module to obtain a third detection signal, and transmitting the third detection signal to the control module, wherein the alternating current signal comprises alternating current voltage and alternating current;

The control module is further configured to stop outputting the first control signal and the third control signal when the ac voltage is greater than a first preset threshold and/or the ac current is greater than a second preset threshold.

8. The inverter circuit of claim 7, wherein the control module comprises a first control unit and a second control unit;

the first control unit is respectively connected with the first detection module, the second detection module, the input module, the switch module and the second control unit, and is used for outputting corresponding second control signals according to the first detection signals and outputting corresponding first control signals according to the second detection signals; and outputting a start signal to the second control unit when the third voltage satisfies the second preset condition, so that the second control unit outputs the third control signal;

the second control unit is respectively connected with the third detection module and the first control unit and is used for stopping outputting the third control signal and outputting a stopping signal to the first control unit when the alternating voltage exceeds the first preset threshold value and/or the alternating current exceeds the second preset threshold value, so that the first control unit stops outputting the first control signal.

9. The inverter circuit of claim 8, further comprising:

the first isolation module is respectively connected with the second detection module and the first control unit and is used for electrically isolating the second detection signal;

the second isolation module is respectively connected with the first control unit and the second control unit and is used for electrically isolating the starting signal;

and the third isolation module is respectively connected with the first control unit and the second control unit and is used for electrically isolating the stop signal.

10. The inverter circuit according to any one of claims 1 to 9, wherein the input module includes:

the protection unit is respectively connected with the direct current source and the voltage conversion unit and is used for realizing the electrical protection of the direct current source and the inverter circuit;

and the voltage conversion unit is connected with the switch module and used for converting the direct-current voltage into the first voltage.

11. The inverter circuit of claim 4, wherein the rectifying module comprises a first diode, a second diode, a third diode, a fourth diode, a first inductance, a first capacitance, and a second capacitance;

The first end of the first inductor is connected with the first end of the secondary winding, the second end of the first inductor is connected with the first end of the first capacitor, the second end of the first capacitor is respectively connected with the anode of the first diode and the cathode of the third diode, the cathode of the first diode is respectively connected with the cathode of the second diode, the first end of the second capacitor and the first input end of the voltage conversion module, the anode of the second diode is respectively connected with the cathode of the fourth diode and the second end of the secondary winding, and the anode of the third diode is respectively connected with the anode of the fourth diode, the second end of the second capacitor and the second input end of the voltage conversion module.

12. The inverter circuit of claim 4, wherein the voltage conversion module comprises a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a second inductor, a third inductor, and a third capacitor;

the first end of the first switching tube is respectively connected with the first end of the second switching tube and the first output end of the rectifying module, the second end of the first switching tube is respectively connected with the first end of the third switching tube and the first end of the second inductor, the second end of the second switching tube is respectively connected with the first end of the fourth switching tube and the first end of the third inductor, the second end of the third switching tube is respectively connected with the second end of the fourth switching tube, the second output end of the rectifying module and the ground, the control end of the first switching tube, the control end of the second switching tube, the control end of the third switching tube and the control end of the fourth switching tube are all connected with the control module, the second end of the second inductor is connected with the first end of the third capacitor and the first end used for connecting a load, and the second end used for connecting the third capacitor and the second end of the load.

13. An inverter comprising the inverter circuit of any one of claims 1 to 12.