CN220382752U - Inverter circuit, inverter and energy storage power supply - Google Patents

Abstract

The application provides an inverter circuit, an inverter and an energy storage power supply, wherein the inverter circuit comprises a direct current conversion circuit, an inverter circuit, a short circuit identification circuit and a control circuit; the direct current conversion circuit is used for converting the input first direct current into the second direct current and outputting the second direct current; the inverter circuit is connected with the direct current conversion circuit and is used for converting the second direct current into alternating current and outputting the alternating current; the short-circuit identification circuit is connected with the inverter circuit and the control circuit, and outputs a first level signal to the control circuit when the voltage output by the inverter circuit is smaller than or equal to a first voltage threshold value; the control circuit is used for turning off the output of the inverter circuit when the control circuit receives the first level signal output by the short circuit identification circuit within a continuous preset time period. The inverter circuit can improve the use safety of the inverter circuit; the fuse is not required to be used as an overload or short-circuit protection device, so that the complicated process of replacing the fuse is avoided, the probability of false triggering protection is reduced, and the use experience of a user is improved.

Description

Inverter circuit, inverter and energy storage power supply

Technical Field

The application relates to the technical field of power supplies, in particular to an inverter circuit, an inverter and an energy storage power supply.

Background

In the current inverter, fuses are mostly adopted as protection devices for overload or short circuit in the inverter, but after triggering short circuit protection, the fuses are required to be replaced, and the replacement process is complicated. Some overload protection technologies are used for realizing overload protection by detecting input current software, but the protection mode is generally sensitive, and the protection is triggered by mistake under the condition of normal access load, so that the use experience of a user is poor.

Disclosure of Invention

The application provides an inverter circuit, an inverter and an energy storage power supply, and aims to improve the use convenience and safety of the inverter and improve the user experience.

In a first aspect, the present application provides an inverter circuit, including a dc conversion circuit, an inverter circuit, a short-circuit identification circuit, and a control circuit; the direct current conversion circuit is used for converting the input first direct current into the second direct current and outputting the second direct current; the inverter circuit is connected with the direct current conversion circuit and used for converting the second direct current into alternating current and outputting the alternating current; the short-circuit identification circuit is connected with the inverter circuit and the control circuit, and outputs a first level signal to the control circuit when the voltage output by the inverter circuit is smaller than or equal to a first voltage threshold value; the control circuit is used for turning off the output of the inverter circuit when the control circuit receives the first level signal output by the short circuit identification circuit within a continuous preset time period.

In an embodiment, when the alternating current output by the inverter circuit is in a negative half cycle or the output side of the inverter circuit is short-circuited, the voltage output by the inverter circuit is less than or equal to a first voltage threshold; when the alternating current output by the inverter circuit is in the positive half cycle, the voltage output by the inverter circuit is larger than the first voltage threshold value.

In one embodiment, the predetermined time period is longer than a duration of a negative half cycle of the alternating current output from the inverter circuit.

In an embodiment, the control circuit is configured to output a shutdown signal to the dc conversion circuit and/or the inverter circuit to shut down the inverter circuit output when the control circuit receives the first level signal output by the short circuit identification circuit within a duration of a preset time period.

In one embodiment, the short-circuit identification circuit comprises a voltage division circuit, a first switch circuit and a second switch circuit, wherein the voltage division circuit is connected with the second switch circuit through the first switch circuit; the voltage dividing circuit is used for outputting a voltage dividing signal according to the voltage of the output end of the inverter circuit; the first switch circuit is used for being turned off when the voltage value of the divided voltage signal is smaller than the on voltage; the second switch circuit is used for outputting a first level signal when the first switch circuit is turned off; when the voltage output by the inverter circuit is smaller than or equal to the first voltage threshold, the voltage value of the divided voltage signal is smaller than the conducting voltage.

In an embodiment, the first switching circuit comprises a first switching tube; the controlled end of the first switching tube is connected with the voltage division end of the voltage division circuit, the first end of the first switching tube is connected with the control end of the second switching circuit, and the second end of the first switching tube is grounded.

In one embodiment, the second switching circuit includes an optocoupler assembly; the first end of the light emitting element of the optical coupler assembly is connected with a first power supply, the second end of the light emitting element of the optical coupler assembly is connected with a first switch circuit, the first end of the light receiving element of the optical coupler assembly is grounded, the second end of the light receiving element of the optical coupler assembly is connected with a second power supply, and the second end of the light receiving element of the optical coupler assembly is also connected with a voltage detection end of the control circuit; the light emitting element is turned off when the first switch circuit is turned off, and the light receiving element is turned off when the light emitting element is turned off, so that the optocoupler assembly outputs a first level signal to the voltage detection end of the control circuit.

In one embodiment, the inverter circuit further comprises an overload protection circuit connected with the direct current conversion circuit; the overload protection circuit is used for outputting a preset feedback signal when the current of the first direct current input by the direct current conversion circuit is greater than or equal to a preset current threshold value, and the preset feedback signal is used for adjusting the magnitude of the second direct current.

In an embodiment, the control circuit adjusts the magnitude of the second direct current when receiving the preset feedback signal, and the current value of the adjusted second direct current is smaller than the current value of the second direct current before adjustment.

In one embodiment, the overload protection circuit includes a detection resistor, a voltage comparison circuit and a third switch circuit; the detection resistor is used for detecting the magnitude of current flowing through the direct current conversion circuit; the first end of the detection resistor is connected with the first voltage detection end of the voltage comparison circuit, and the second end of the detection resistor is connected with the second voltage detection end of the voltage comparison circuit; the output end of the voltage comparison circuit is connected with the controlled end of the third switching circuit, the first end of the third switching circuit is connected with the fourth power supply, and the second end of the third switching circuit is connected with the control circuit; when the inversion circuit is in overcurrent, the voltage difference between the first voltage detection end and the second voltage detection end of the voltage comparison circuit is increased along with the increase of the current flowing through the direct current conversion circuit, and when the current flowing through the direct current conversion circuit is greater than or equal to a preset current threshold value, the voltage comparison circuit outputs a first electric signal to the third switch circuit; the third switch circuit is conducted when the first electric signal is received, so that a preset feedback signal is output to the control circuit.

In one embodiment, the voltage comparison circuit includes a first comparator and a second comparator; the first end of the detection resistor is connected with the same-phase end of the first comparator, the second end of the detection resistor is connected with the opposite-phase end of the first comparator, and the output end of the first comparator is connected with the opposite-phase end of the second comparator; the in-phase end of the second comparator is used for being connected with a third power supply, and the output end of the second comparator is connected with the controlled end of the third switch circuit; when the inversion circuit is in overcurrent, the voltage difference between the non-inverting terminal of the first comparator and the inverting terminal of the first comparator increases along with the increase of the current flowing through the direct current conversion circuit, and the first comparator is used for outputting a first voltage signal to the second comparator when the voltage difference between the non-inverting terminal of the first comparator and the inverting terminal of the first comparator is greater than or equal to a second voltage threshold; the second comparator is used for outputting a first electric signal to the third switch circuit when receiving the first voltage signal.

In an embodiment, the inverter circuit further comprises a load voltage adjusting circuit and/or an idle voltage adjusting circuit, wherein the load voltage adjusting circuit and/or the idle voltage adjusting circuit are/is connected with the control circuit, the load voltage adjusting circuit is used for adjusting the voltage output to a load connected with the inverter circuit, and the idle voltage adjusting circuit is used for adjusting the voltage output by the inverter circuit when the inverter circuit is in an idle state.

In a second aspect, the present application provides an inverter comprising a housing and an inverter circuit as provided in any one of the embodiments above, the inverter circuit being at least partially disposed within the housing.

In a third aspect, the present application provides an energy storage power supply, including an energy storage module, an inverter circuit as provided in the first aspect, and an output interface, where the output interface is used to connect to a target electric device, and the energy storage module is connected to the output interface through the inverter circuit, so as to provide a target voltage to the target electric device, so that the target electric device operates.

The application provides a short-circuit identification circuit in an inverter circuit, which can output a first level signal to a control circuit by detecting that the voltage output by the inverter circuit is smaller than or equal to a first voltage threshold value, and if the control circuit receives the first level signal output by the short-circuit identification circuit within a continuous preset time period, the control circuit determines that the alternating current output is short-circuited and turns off the output of the inverter circuit; when the alternating current output of the inverter circuit is short-circuited, the output of the inverter circuit can be turned off, so that the inverter circuit is protected, and the use safety of the inverter circuit is improved; meanwhile, in the overload and short-circuit protection process, a fuse is not required to be used as an overload or short-circuit protection device, so that the complicated process of replacing the fuse is avoided, the probability of false triggering protection is reduced, and the use experience of a user is improved.

Drawings

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

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

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

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

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

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

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

fig. 7 is a schematic diagram of an inverter circuit according to another embodiment of the present disclosure;

fig. 8 is a schematic diagram of an inverter circuit according to another embodiment of the present disclosure.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.

Referring to fig. 1, fig. 1 is a schematic diagram of an inverter circuit 10 according to an embodiment of the present application.

As shown in fig. 1, the inverter circuit 10 includes a dc conversion circuit 11, an inverter circuit 12, a short-circuit identification circuit 13, and a control circuit 14. The dc conversion circuit 11 is configured to convert an input first dc power into a second dc power and output the second dc power to the inverter circuit 12. The inverter circuit 10 is connected to the dc conversion circuit 11, and the inverter circuit 10 is configured to convert the input second dc power into the output ac power, so as to implement ac output of the inverter circuit 10. The short-circuit identification circuit 13 connects the inverter circuit 12 and the control circuit 14, and it is understood that the control circuit 14 is capable of detecting the voltage output from the inverter circuit 12 by the short-circuit identification circuit 13 to identify whether or not an overload or short-circuit condition occurs in the inverter circuit 10, and turning off the output of the inverter circuit 12 to protect the inverter circuit 10 when the overload or short-circuit condition occurs in the inverter circuit 10. Specifically, when the voltage output by the inverter circuit 12 is less than or equal to the first voltage threshold, the short-circuit identification circuit 13 outputs a first level signal to the control circuit 14, and when the control circuit 14 receives the first level signal output by the short-circuit identification circuit 13 within a continuous preset time period, it is determined that the ac output is short-circuited, and the inverter circuit 12 is turned off.

In an embodiment, when the alternating current output by the inverter circuit 12 is in a negative half cycle or the output side of the inverter circuit 12 is short-circuited, the voltage output by the inverter circuit 12 is less than or equal to the first voltage threshold; when the alternating current output by the inverter circuit 12 is in the positive half cycle, the voltage output by the inverter circuit 12 is greater than the first voltage threshold.

It should be understood that, in the normal operation state of the inverter circuit 12, the period corresponding to the output ac power of the inverter circuit 12 includes a positive half cycle and a negative half cycle, and when the inverter circuit 12 outputs ac power normally, the ac power enters the negative half cycle after the positive half cycle is ended, and enters the positive half cycle again after the negative half cycle is ended, so as to cycle; when the alternating current output by the inverter circuit 12 is in the negative half cycle, the voltage output by the inverter circuit 12 is smaller than or equal to the first voltage threshold, and when the alternating current output by the inverter circuit 12 is in the positive half cycle, the voltage output by the inverter circuit 12 is greater than the first voltage threshold, so that the short-circuit identification circuit 13 outputs a first level signal or outputs a second level signal to the control circuit 14 in a normal working state of the inverter circuit 12, wherein the voltage value of the first level signal is greater than the voltage value of the second level signal. It will be appreciated that, when the ac power output from the inverter circuit 12 is a negative half cycle, the voltage output from the inverter circuit 12 is less than or equal to the first voltage threshold, the short-circuit identification circuit 13 outputs the first level signal to the control circuit 14 when the voltage output from the inverter circuit 12 is less than or equal to the first voltage threshold, and when the ac power output from the inverter circuit 12 is a positive half cycle, the voltage output by the inverter circuit 12 is greater than the first voltage threshold, the short-circuit identification circuit 13 outputs a second level signal to the control circuit 14 when the voltage output by the inverter circuit 12 is greater than the first voltage threshold, so that the control circuit 14 receives the first level signal and the second level signal, and the control circuit 14 maintains the normal operation of each circuit when the duration of continuously receiving the first level signal is less than the preset duration.

In one embodiment, the predetermined time period is longer than the duration of the negative half cycle of the alternating current output from the inverter circuit 12.

It should be noted that, when the inverter circuit 12 is in the normal operation state and the output ac is a negative half cycle, the short-circuit identification circuit 13 outputs the first level signal to the control circuit 14, so, in order to avoid the control circuit 14 from false triggering of the short-circuit protection during the normal operation of the inverter circuit 12, the duration of the negative half cycle of the ac is less than the preset duration, so that, when the inverter circuit 12 is in the normal operation state, the duration of the control circuit 14 receiving the first level signal output by the short-circuit identification circuit 13 is less than the preset duration, the control circuit 14 will not turn off the output of the inverter circuit 12, so that the inverter circuit 12 can continue to operate normally.

In another embodiment, the control circuit 14 is configured to output a shutdown signal to the dc conversion circuit 11 and/or the inverter circuit 12 to shut down the output of the inverter circuit 12 when the first level signal output by the short-circuit identification circuit 13 is received for a duration of a preset period.

In a specific implementation process, if the inverter circuit 10 has a short circuit or an overload condition, the voltage output by the inverter circuit 12 will be pulled down, so that the voltage output by the inverter circuit 12 is smaller than or equal to the first voltage threshold, so that the control circuit 14 receives the first level signal output by the short circuit identification circuit 13 within a continuous preset time period, at this time, it can be determined that the ac output is short-circuited, and the control circuit 14 outputs a short circuit signal to the dc conversion circuit 11 and/or the inverter circuit 12 to turn off the output of the inverter circuit 12, thereby achieving the purpose of protecting the circuit.

Referring to fig. 2, fig. 2 is a schematic diagram of an inverter circuit 10 according to another embodiment of the present application.

In one embodiment, the short-circuit identification circuit 13 includes a voltage division circuit 131, a first switch circuit 132, and a second switch circuit 133, and the voltage division circuit 131 is connected to the second switch circuit 133 through the first switch circuit 132. The voltage dividing circuit 131 is used for outputting a voltage dividing signal according to the voltage of the output end of the inverter circuit 12; the first switch circuit 132 is configured to be turned off when the voltage value of the divided signal is smaller than the on voltage; the second switch circuit 133 is configured to output a first level signal when the first switch circuit 132 is turned off; when the voltage output by the inverter circuit 12 is less than or equal to the first voltage threshold, the voltage value of the divided voltage signal is less than the on voltage.

In a specific implementation process, when the ac output by the inverter circuit 12 is in a negative half cycle and the output voltage is less than or equal to the first voltage threshold, the voltage dividing circuit 131 outputs a voltage dividing signal to the first switch circuit 132 according to the voltage at the output end of the inverter circuit 12, and when the voltage output by the inverter circuit 12 is less than or equal to the first voltage threshold, the voltage value of the voltage dividing signal is less than the on voltage, the first switch circuit 132 is in an off state, so that the second switch circuit 133 outputs the first level signal to the control circuit 14, and it can be understood that, when the ac output is short-circuited, the voltage output by the inverter circuit 12 is continuously less than or equal to the first voltage threshold, and the voltage value of the voltage dividing signal output by the voltage dividing circuit 131 to the first switch circuit 132 is continuously less than the on voltage, so that the second switch circuit 133 continuously outputs the first level signal to the control circuit 14.

When the inverter circuit 12 is in a normal operation state and the alternating current output by the inverter circuit 12 is in a positive half cycle, the voltage value of the voltage division signal output by the voltage division circuit 131 to the first switch circuit 132 is larger than the conducting voltage of the first switch circuit 132, and the first switch circuit 132 is conducted; the second switch circuit 133 is turned on when the first switch circuit 132 is turned on, and outputs a second level signal to the control circuit 14 to maintain the circuits in the inverter circuit 10 in a normal operation state.

The voltage dividing circuit 131 outputs a voltage dividing signal according to the voltage at the output end of the inverter circuit 12, so that the alternating current output by the inverter circuit 12 is positive half cycle, when the output voltage is greater than the first voltage threshold value, the second switch circuit 133 can output a second level signal to the control circuit 14, and when the alternating current output by the inverter circuit 12 is negative half cycle, the output voltage is less than or equal to the first voltage threshold value, the second switch circuit 133 outputs the first level signal to the control circuit 14, so that the control circuit 14 can continuously detect the voltage output by the inverter circuit 12 under the condition that the inverter circuit 12 is in normal operation, and can timely turn off the output of the inverter circuit 12 when the inverter circuit 12 is short-circuited, so as to protect the circuit.

Referring to fig. 3, fig. 3 is a schematic diagram of an inverter circuit 10 according to another embodiment of the present application.

In one embodiment, the first switching circuit 132 includes a first switching tube Q1; the controlled end of the first switching tube Q1 is connected with the voltage division end of the voltage division circuit 131, the first end of the first switching tube Q1 is connected with the control end of the second switching circuit 133, and the second end of the first switching tube Q1 is grounded.

In a specific implementation process, the first switching tube Q1 is a triode, the voltage dividing circuit 131 includes a first resistor R1 and a second resistor R2, where a first end of the first resistor R1 is connected to the inverter circuit 12, a second end of the first resistor R1 is connected to a base of the triode and a first end of the second resistor R2, a collector of the triode is connected to a control end of the second switching circuit 133, and an emitter of the triode and a second end of the second resistor R2 are both grounded. When the voltage value of the divided signal is smaller than the on voltage of the transistor, the transistor is turned off, so that the second switch circuit 133 outputs the first level signal to the control circuit 14.

Referring to fig. 4, fig. 4 is a schematic diagram of an inverter circuit 10 according to another embodiment of the present application.

In one embodiment, the second switching circuit 133 includes an optocoupler 1331. The first end of the light emitting element of the optocoupler 1331 is connected to a first power supply, the second end of the light emitting element of the optocoupler 1331 is connected to the first switch circuit 132, the first end of the light receiving element of the optocoupler 1331 is grounded, the second end of the light receiving element of the optocoupler 1331 is connected to a second power supply, and the second end of the light receiving element of the optocoupler 1331 is also connected to a voltage detection end of the control circuit 14.

In a specific implementation process, the second switch circuit 133 further includes a third resistor and a fourth resistor, the first end of the light emitting element of the optocoupler 1331 is connected to a first power supply (denoted by R12V in the figure) through a third resistor R3, and the second end of the light receiving element of the optocoupler 1331 is connected to a second power supply (denoted by 5V in the figure) through a fourth resistor R4, so as to achieve the purpose of protecting the optocoupler 1331.

The light emitting element is turned off when the first switching circuit 132 is turned off, and the light receiving element is turned off when the light emitting element is turned off, so that the second end of the light receiving element can output the first level signal to the control circuit 14 according to the electric power supplied from the second power supply. When the first switch circuit 132 is turned on, the light emitting element emits light, and when the light emitting element emits light, the light receiving element is turned on, so that the first end of the light receiving element can discharge the electric energy of the second end of the light receiving element, and the second end of the light receiving element outputs a second level signal to the control circuit 14.

The first switching tube Q1 is turned on or off according to the voltage output by the inverter circuit 12, and the optocoupler component 1331 is turned off when the first switching tube Q1 is turned off, so as to output a first level signal to the control circuit 14, so that the control circuit 14 can determine the voltage output by the inverter circuit 12 according to the duration of continuously receiving the first level signal, thereby determining whether the inverter circuit 12 has an ac output short circuit, and achieving the purpose of detecting the ac output short circuit.

Referring to fig. 5, fig. 5 is a schematic diagram of an inverter circuit 10 according to another embodiment of the present application.

In an embodiment, the inverter circuit 10 further comprises an overload protection circuit 15 connected to the dc conversion circuit 11. The overload protection circuit 15 is configured to output a preset feedback signal when a current of the first direct current input by the direct current conversion circuit 11 is greater than or equal to a preset current threshold.

In a specific implementation process, the dc conversion circuit 11 is further connected to the overload protection circuit 15, and when the overload protection circuit 15 detects that the first dc input by the dc conversion circuit 11 is greater than or equal to the preset current threshold, a feedback signal is output to the control circuit 14, so that the control circuit 14 adjusts the magnitude of the second dc when receiving the preset feedback signal.

In an embodiment, the control circuit 14 adjusts the magnitude of the second dc power when receiving the preset feedback signal, wherein the adjusted current value of the second dc power is smaller than the current value of the second dc power before adjustment, so as to achieve the purpose of protecting the circuit. It can be understood that, if the voltage output by the inverter circuit 12 still makes the short-circuit identification circuit 13 output the first level signal to the control circuit 14 after the second direct current is adjusted, it can be determined that the inverter circuit 10 has an ac output short circuit, and by adjusting the second direct current, protection of the circuit is achieved, accuracy of short-circuit identification is improved, and user experience is improved.

Referring to fig. 6, fig. 6 is a schematic diagram of an inverter circuit 10 according to another embodiment of the present application.

In one embodiment, the overload protection circuit 15 includes a detection resistor R5, a voltage comparison circuit 151, and a third switch circuit 152. The detection resistor R5 is used for detecting the magnitude of the current flowing through the direct current conversion circuit 11; the first end of the detection resistor R5 is connected with the first voltage detection end of the voltage comparison circuit 151, and the second end of the detection resistor R5 is connected with the second voltage detection end of the voltage comparison circuit 151; a third voltage detection end of the voltage comparison circuit 151 is connected to a third power supply; an output terminal of the voltage comparison circuit 151 is connected to a controlled terminal of the third switching circuit 152, a first terminal of the third switching circuit 152 is connected to the fourth power supply, and a second terminal of the third switching circuit 152 is connected to the control circuit 14.

In a specific implementation process, the voltage difference between the first voltage detection terminal and the second voltage detection terminal of the voltage comparison circuit 151 increases and increases with the current flowing through the dc conversion circuit 11, so as to realize current detection of the dc conversion circuit 11; and when the current flowing through the dc conversion circuit 11 is greater than or equal to a preset current threshold value when the inverter circuit 12 is overcurrent, in this case, the voltage comparison circuit 151 outputs a first electric signal to the third switch circuit 152; the third switch circuit 152 is turned on when receiving the first electrical signal, so as to output a preset feedback signal to the control circuit 14, so that the control circuit 14 can adjust the magnitude of the second direct current of the direct current conversion circuit 11 according to the preset feedback signal.

Referring to fig. 7, fig. 7 is a schematic diagram of an inverter circuit 10 according to another embodiment of the present application.

In one embodiment, the voltage comparison circuit 151 includes a first comparator a and a second comparator B; the first end of the detection resistor R5 is connected with the same-phase end of the first comparator A, the second end of the detection resistor R5 is connected with the opposite-phase end of the first comparator A, and the output end of the first comparator A is connected with the opposite-phase end of the second comparator B; the non-inverting terminal of the second comparator B is used for being connected to a third power supply (denoted by 2.5V in the figure), and the output terminal of the second comparator B is connected to the controlled terminal of the third switch circuit 152.

In a specific implementation process, when the inverter circuit 12 is over-current, the voltage difference between the non-inverting terminal of the first comparator a and the inverting terminal of the first comparator a increases with the current flowing through the dc conversion circuit 11, and when the voltage difference between the non-inverting terminal of the first comparator a and the inverting terminal of the first comparator a is greater than or equal to the second voltage threshold, the first comparator a outputs the first voltage signal to the second comparator B, and the second comparator B outputs the first electrical signal to the third switch circuit 152 when receiving the first voltage signal.

It should be understood that, in a state in which the inverter circuit 12 is in normal operation, the voltage difference between the non-inverting terminal of the first comparator a and the inverting terminal of the first comparator a is smaller than the second voltage threshold, and the first comparator a outputs the second voltage signal to the second comparator B; the second comparator B compares the received second voltage signal with the power voltage signal applied to the same-phase end of the second comparator B by the third power supply, and outputs a second electrical signal corresponding to the comparison result to the third switch circuit 152, so that the third switch circuit 152 is turned off, the effect of maintaining the current running state of the dc conversion circuit 11 without adjusting the second dc voltage of the dc conversion circuit 11 is achieved.

When the inverter circuit 12 is over-current, the voltage difference between the non-inverting terminal of the first comparator a and the inverting terminal of the first comparator a increases with the current flowing through the dc conversion circuit 11, and when the voltage difference between the non-inverting terminal of the first comparator a and the inverting terminal of the first comparator a is greater than or equal to the second voltage threshold, the first comparator a outputs a first voltage signal to the second comparator B; the second comparator B compares the received first voltage signal with a power voltage signal applied to the same-phase end of the second comparator B by the third power supply, and outputs a first electrical signal corresponding to the comparison result to the third switch circuit 152, so that the third switch circuit 152 is turned on to output a preset feedback signal to the control circuit 14, thereby enabling the control circuit 14 to adjust the magnitude of the second direct current of the direct current conversion circuit 11.

Illustratively, the third switching circuit 152 includes a field effect transistor Q2 and an anti-reflection component D1; wherein, the grid electrode of the field effect tube Q2 is connected with the output end of the second comparator B, and the source electrode of the field effect tube Q2 is connected with a fourth power supply (shown as 5V in the figure); the drain electrode of the field effect transistor Q2 is connected to the first end of the anti-reflection component D1, and the second end of the anti-reflection component D1 is connected to the control circuit 14.

The voltage level of the third power supply is 2.5V, and the voltage level of the fourth power supply is 5V, for example.

Referring to fig. 8, fig. 8 is a schematic diagram of an inverter circuit 10 according to another embodiment of the present application.

In an embodiment, the inverter circuit 10 further includes a load voltage adjusting circuit 16 and/or an idle voltage adjusting circuit 17, where the load voltage adjusting circuit 16 and/or the idle voltage adjusting circuit 17 are connected to the control circuit 14, the load voltage adjusting circuit 16 is configured to adjust a voltage output to a load connected to the inverter circuit 10, and the idle voltage adjusting circuit 17 is configured to adjust a voltage output by the inverter circuit 10 when the inverter circuit 10 is in an idle state. In which fig. 8 shows a case where the inverter circuit 10 includes a load voltage adjusting circuit 16 and an idle voltage adjusting circuit 17.

Illustratively, the load voltage regulation circuit 16 is capable of regulating the voltage output to the load connected to the inverter circuit 10 to provide the load connected to the inverter circuit 10 with the desired operating voltage for the load; the no-load voltage adjustment circuit 17 can adjust the output voltage when the inverter circuit 10 is no-load.

The present application also provides an inverter comprising a housing and at least an inverter circuit as provided in any one of the embodiments above; the inverter circuit is at least partially disposed within the housing.

For example, the specific setting manner of the inverter circuit may refer to the corresponding embodiments described in the specification of the present application, and the description of the embodiment is omitted herein.

It should be noted that, the inverter can also be provided with other circuits according to the needs of the user, and be connected with the inverter circuit provided in any embodiment of the present application, so as to achieve the functions and effects expected by the user, which are not limited in the present application.

The application also provides an energy storage power supply, which comprises an energy storage module, an inverter circuit and an output interface, wherein the inverter circuit is provided by any embodiment of the application; the output interface is used for being connected with target electric equipment, the energy storage module is connected with the output interface through the inverter circuit, so that target voltage is provided for the target electric equipment, and the target electric equipment can operate, wherein the energy storage power supply can comprise a mobile power supply, a vehicle emergency starting power supply, an outdoor energy storage power supply and the like, and the target electric equipment is, for example, household electrical equipment utilizing alternating current or other electric equipment needing to utilize the alternating current, and the energy storage power supply is not limited in the application.

In the description of the present application, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected. Either mechanically or electrically. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The above disclosure provides many different embodiments or examples for implementing different structures of the present application. The components and arrangements of specific examples are described above in order to simplify the disclosure of this application. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above embodiments are only preferred embodiments of the present application, and the scope of the present application is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present application are intended to be within the scope of the present application.

Claims (14)

1. An inverter circuit, the inverter circuit comprising:

the direct current conversion circuit is used for converting the input first direct current into the second direct current and outputting the second direct current;

the inverter circuit is connected with the direct current conversion circuit and is used for converting the second direct current into alternating current and outputting the alternating current;

the short-circuit identification circuit is connected with the inverter circuit and the control circuit, and outputs a first level signal to the control circuit when the voltage output by the inverter circuit is smaller than or equal to a first voltage threshold value;

and the control circuit is used for turning off the output of the inverter circuit when the control circuit receives the first level signal output by the short circuit identification circuit within a continuous preset time.

2. The inverter circuit of claim 1, wherein the voltage output by the inverter circuit is less than or equal to the first voltage threshold when the alternating current output by the inverter circuit is at a negative half cycle or the output side of the inverter circuit is shorted; when the alternating current output by the inverter circuit is in the positive half cycle, the voltage output by the inverter circuit is larger than the first voltage threshold.

3. The inverter circuit of claim 1, wherein the predetermined period of time is longer than a duration of a negative half cycle of the alternating current output by the inverter circuit.

4. The inverter circuit of claim 1, wherein the control circuit is configured to output a shutdown signal to the dc conversion circuit and/or the inverter circuit to shut down the inverter circuit output when the first level signal output by the short circuit identification circuit is received for a predetermined duration.

5. The inverter circuit according to any one of claims 1 to 4, wherein the short-circuit identification circuit includes a voltage division circuit, a first switching circuit, and a second switching circuit, the voltage division circuit being connected to the second switching circuit through the first switching circuit;

the voltage dividing circuit is used for outputting a voltage dividing signal according to the voltage of the output end of the inverter circuit;

the first switch circuit is used for being turned off when the voltage value of the voltage division signal is smaller than the on voltage;

the second switch circuit is used for outputting the first level signal when the first switch circuit is turned off; when the voltage output by the inverter circuit is smaller than or equal to the first voltage threshold, the voltage value of the voltage division signal is smaller than the conducting voltage.

6. The inverter circuit of claim 5, wherein the first switching circuit comprises a first switching tube;

the controlled end of the first switching tube is connected with the voltage division end of the voltage division circuit, the first end of the first switching tube is connected with the control end of the second switching circuit, and the second end of the first switching tube is grounded.

7. The inverter circuit of claim 5, wherein the second switching circuit comprises an optocoupler assembly;

the first end of the light emitting element of the optical coupler assembly is connected with a first power supply, the second end of the light emitting element of the optical coupler assembly is connected with the first switch circuit, the first end of the light receiving element of the optical coupler assembly is grounded, the second end of the light receiving element of the optical coupler assembly is connected with a second power supply, and the second end of the light receiving element of the optical coupler assembly is also connected with the voltage detection end of the control circuit;

the light emitting element is turned off when the first switch circuit is turned off, and the light receiving element is turned off when the light emitting element is turned off, so that the optocoupler assembly outputs the first level signal to the voltage detection end of the control circuit.

8. The inverter circuit of any one of claims 1-4, further comprising an overload protection circuit coupled to the dc conversion circuit; the overload protection circuit is used for outputting a preset feedback signal when the current of the first direct current input by the direct current conversion circuit is greater than or equal to a preset current threshold value, and the preset feedback signal is used for adjusting the magnitude of the second direct current.

9. The inverter circuit of claim 8, wherein the control circuit adjusts the magnitude of the second direct current when receiving a preset feedback signal, the adjusted current value of the second direct current being less than the current value of the second direct current prior to adjustment.

10. The inverter circuit of claim 8, wherein the overload protection circuit comprises a sense resistor, a voltage comparison circuit, and a third switching circuit;

the detection resistor is used for detecting the magnitude of current flowing through the direct current conversion circuit;

the first end of the detection resistor is connected with the first voltage detection end of the voltage comparison circuit, and the second end of the detection resistor is connected with the second voltage detection end of the voltage comparison circuit; a third voltage detection end of the voltage comparison circuit is connected with a third power supply; the output end of the voltage comparison circuit is connected with the controlled end of the third switching circuit, the first end of the third switching circuit is connected with a fourth power supply, and the second end of the third switching circuit is connected with the control circuit;

when the inverter circuit is in overcurrent, the voltage difference between the first voltage detection end and the second voltage detection end of the voltage comparison circuit increases along with the increase of the current flowing through the direct current conversion circuit, and when the current flowing through the direct current conversion circuit is greater than or equal to a preset current threshold value, the voltage comparison circuit outputs a first electric signal to the third switch circuit;

the third switch circuit is conducted when the first electric signal is received, so that a preset feedback signal is output to the control circuit.

11. The inverter circuit of claim 10, wherein the voltage comparison circuit comprises a first comparator and a second comparator;

the first end of the detection resistor is connected with the same-phase end of the first comparator, the second end of the detection resistor is connected with the opposite-phase end of the first comparator, and the output end of the first comparator is connected with the opposite-phase end of the second comparator; the in-phase end of the second comparator is used for being connected with a third power supply, and the output end of the second comparator is connected with the controlled end of the third switch circuit;

when the inverter circuit is over-current, the voltage difference between the non-inverting terminal of the first comparator and the inverting terminal of the first comparator increases along with the increase of the current flowing through the direct current conversion circuit,

the first comparator is used for outputting a first voltage signal to the second comparator when the voltage difference between the non-inverting terminal of the first comparator and the inverting terminal of the first comparator is greater than or equal to a second voltage threshold; the second comparator is used for outputting a first electric signal to the third switch circuit when receiving the first voltage signal.

12. The inverter circuit of any one of claims 1-4, further comprising a load voltage adjustment circuit and/or an idle voltage adjustment circuit, the load voltage adjustment circuit and/or the idle voltage adjustment circuit being coupled to the control circuit, the load voltage adjustment circuit being configured to adjust a voltage output to a load coupled to the inverter circuit, the idle voltage adjustment circuit being configured to adjust a voltage output by the inverter circuit when the inverter circuit is in an idle state.

13. An inverter comprising a housing and an inverter circuit as claimed in any one of claims 1 to 12, the inverter circuit being at least partially disposed within the housing.

14. An energy storage power supply, comprising an energy storage module, an inverter circuit according to any one of claims 1-12, and an output interface, wherein the output interface is configured to be connected to a target electric device, and the energy storage module is connected to the output interface through the inverter circuit, so as to provide a target voltage to the target electric device, so that the target electric device operates.