CN220985548U - Protection circuit, energy storage inversion power supply and photovoltaic energy storage inversion system - Google Patents
Protection circuit, energy storage inversion power supply and photovoltaic energy storage inversion system Download PDFInfo
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Abstract
The application discloses a protection circuit, an energy storage inversion power supply and a photovoltaic energy storage inversion system, wherein the protection circuit is applied to the energy storage inversion power supply and comprises a control module, a voltage comparison module, a protection module and a triggering module, wherein the voltage comparison module comprises a comparator, a positive input end of the comparator is used for sampling target voltage, an opposite input end of the comparator is used for accessing reference voltage, the protection module is connected with an output end of the comparator, the protection module can clamp the voltage of the output end of the comparator at a low level in the power-on process of the energy storage inversion power supply, the triggering module is connected with the output end of the comparator and the control module, and the triggering module outputs a first electric signal to the control module when the output end of the comparator outputs the low level so that the control module does not start protection. The design can effectively avoid error protection in the power-on process of the energy storage inverter power supply, so that the energy storage inverter power supply can be started normally.
Description
Technical Field
The application relates to the technical field of energy storage inverter power supplies, in particular to a protection circuit, an energy storage inverter power supply and a photovoltaic energy storage inverter system.
Background
Along with the improvement of the living standard of people, the energy storage inverter power supply is widely applied in order to cope with the situations of power failure, outdoor no power supply, indoor inconvenient wiring and the like. In the process of using the energy storage inverter, the safety and reliability are important indexes which must be ensured by manufacturers, so that the protection circuit is designed in the energy storage inverter generally, and when the working state of the energy storage inverter is abnormal, the protection circuit in the energy storage inverter can timely act to protect the energy storage inverter and the safety of users.
The protection circuit in the related art comprises a comparator, and even if the target voltage sampled by the positive input end of the comparator is smaller than the reference voltage accessed by the negative input end of the comparator in the power-on process of the energy storage inverter due to the characteristics of the comparator, the output end of the comparator still keeps a high-resistance state, and at the moment, the controller of the protection circuit can judge that the energy storage inverter has a fault at present according to the high level error, so that the energy storage inverter is turned on for protection by mistake (for example, the energy storage inverter is turned off forcibly). Therefore, how to effectively avoid the error protection in the power-on process of the energy storage inverter power supply so as to ensure that the energy storage inverter power supply can be started normally has become a problem to be solved.
Disclosure of utility model
The embodiment of the application provides a protection circuit, an energy storage inverter power supply and a photovoltaic energy storage inverter system, which can solve the problem that the energy storage inverter power supply cannot be started normally due to error protection in the power-on process of the energy storage inverter power supply in the related technology.
In a first aspect, an embodiment of the present application provides a protection circuit; the protection circuit is applied to an energy storage inverter power supply, the protection circuit comprises a control module, a voltage comparison module, a protection module and a trigger module, the voltage comparison module comprises a comparator, a normal phase input end of the comparator is used for sampling target voltage, an opposite phase input end of the comparator is used for accessing reference voltage, the protection module is connected with an output end of the comparator, the protection module can clamp the voltage of the output end of the comparator at a low level in the power-on process of the energy storage inverter power supply, the trigger module is connected with the output end of the comparator and the control module, and the trigger module outputs a first electric signal to the control module when the output end of the comparator outputs the low level so that the control module does not start protection.
According to the protection circuit provided by the embodiment of the application, even if the target voltage sampled by the positive input end of the comparator is smaller than the reference voltage accessed by the negative input end of the comparator in the power-on process of the energy storage inverter, the output end of the comparator still keeps a high-resistance state, but through the design of the protection module, the protection module can clamp the voltage of the output end of the comparator at a low level in the power-on process of the energy storage inverter, and the triggering module outputs a first electric signal to the control module when the output end of the comparator outputs the low level, the control module judges that the target voltage sampled by the positive input end of the comparator is normal according to the first electric signal, and the control module does not start protection, so that error protection in the power-on process of the energy storage inverter is effectively avoided, and normal power-on of the energy storage inverter is ensured.
In a second aspect, an embodiment of the present application provides an energy storage inverter power supply, where the energy storage inverter power supply includes a circuit board and the protection circuit, and the protection circuit is fabricated on the circuit board.
According to the energy storage inverter power supply provided by the embodiment of the application, the energy storage inverter power supply with the protection circuit can effectively avoid error protection in the power-on process of the energy storage inverter power supply, so that the energy storage inverter power supply can be started normally.
In a third aspect, an embodiment of the present application provides a photovoltaic energy storage inversion system, where the photovoltaic energy storage inversion system includes a photovoltaic module and the energy storage inversion power supply described above, and the photovoltaic module is connected with the energy storage inversion power supply.
Based on the photovoltaic energy storage inversion system provided by the embodiment of the application, the photovoltaic energy storage inversion system with the energy storage inversion power supply can effectively avoid error protection in the power-on process of the energy storage inversion power supply so as to ensure that the energy storage inversion power supply can be started normally.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a frame structure of a protection circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a protection circuit according to an embodiment of the application.
Reference numerals: 1. a protection circuit; 10. a control module; 20. a voltage comparison module; U1B, comparator; r EF1, a first voltage dividing resistor; r EF2 and a second voltage dividing resistor; r2, a second resistor; r3, a third resistor; r4, a fourth resistor; c2, a second capacitor; c3, a third capacitor; 30. a protection module; d1, a first diode; c1, a first capacitor; r1, a first resistor; 40. a triggering module; q1, a switching tube; d2, a second diode; r5, a fifth resistor; r6, a sixth resistor; r7, a seventh resistor; c4, a fourth capacitor; VCC, supply voltage; v REF, reference voltage.
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.
Referring to fig. 1-2, a protection circuit 1 is provided in a first aspect of the present application, which is applied to an energy storage inverter power supply, and can effectively avoid error protection during power-up of the energy storage inverter power supply, so as to ensure that the energy storage inverter power supply can be started normally.
The protection circuit 1 is applied to an energy storage inverter power supply, and the protection circuit 1 comprises a control module 10, a voltage comparison module 20, a protection module 30 and a triggering module 40; the voltage comparison module 20 comprises a comparator U1B, wherein a non-inverting input end of the comparator U1B is used for sampling the target voltage, and an inverting input end of the comparator U1B is used for accessing the reference voltage V REF; the protection module 30 is connected with the output end of the comparator U1B, and the protection module 30 can clamp the voltage of the output end of the comparator U1B at a low level in the process of powering on the energy storage inverter; the trigger module 40 is connected to the output terminal of the comparator U1B and the control module 10, and when the output terminal of the comparator U1B outputs a low level, the trigger module 40 outputs a first electrical signal to the control module 10, so that the control module 10 does not start protection.
The specific structure of the protection circuit 1 will be described in detail with reference to fig. 1 to 2.
The energy storage inversion power supply is applied to a photovoltaic energy storage inversion system (not shown in the figure), the photovoltaic energy storage inversion system further comprises a photovoltaic module (not shown in the figure), the output end of the photovoltaic module is connected with the input end of the energy storage inversion power supply, and the photovoltaic module is used for absorbing solar energy from the sun, converting the solar energy into direct current and outputting the direct current to the energy storage inversion power supply. The output end of the energy storage inverter power supply is used for being connected with a load so as to convert direct current output by the photovoltaic module into alternating current and output the alternating current to the load. The term "load" is understood to mean a device that consumes electric energy when in operation, and may be, for example, but not limited to, a household appliance such as a refrigerator, an air conditioner, a water heater, or the like. It should be noted that, the energy storage inverter power supply may be connected to one photovoltaic module, or may be connected to a plurality of photovoltaic modules at the same time. The energy storage inverter power supply can be portable outdoor mobile energy storage power supply equipment so that after the energy storage inverter power supply is charged through the photovoltaic assembly, a user can bring the energy storage inverter power supply outdoors to meet the power consumption requirements of related loads.
As shown in fig. 1-2, the protection circuit 1 includes a control module 10, a voltage comparison module 20, a protection module 30, and a trigger module 40.
The control module 10 is used as a core controller of the protection circuit 1, the specific circuit structure of the control module 10 is not limited, and a designer can reasonably design according to actual needs, for example, the control module 10 may include an MCU (Microcontroller Unit, micro control unit).
The voltage comparison module 20 is used to compare the target voltage with the reference voltage V REF, and the specific circuit structure of the voltage comparison module 20 will be described below.
The voltage comparison module 20 includes a comparator U1B, a non-inverting input terminal of the comparator U1B is used for sampling the target voltage, and an inverting input terminal of the comparator U1B is used for accessing the reference voltage V REF. The target voltage can be the output voltage of the photovoltaic module or the bus voltage of the energy storage inverter power supply; it should be noted that, as long as the energy storage inverter power supply relates to the design of overvoltage protection, the protection circuit 1 may be used to realize circuit protection. The reference voltage V REF is a voltage reference for determining whether or not an abnormality occurs in the target voltage, and the reference voltage V REF can be calculated based on the first voltage dividing resistor R EF1 (described later), the second voltage dividing resistor R EF2 (described later), and the power supply voltage VCC.
The protection module 30 can avoid the control module 10 from starting protection during the power-on process of the energy storage inverter power supply to ensure that the whole energy storage inverter power supply can be started normally, and the specific circuit structure of the protection module 30 will be described below. It should be noted that, the "during the power-up process of the energy storage inverter" is understood to be a process in which the supply voltage VCC is changed from 0V to a certain preset voltage (e.g., 3.3V).
The protection module 30 is connected with the output end of the comparator U1B, and the protection module 30 can clamp the voltage of the output end of the comparator U1B at a low level in the power-on process of the energy storage inverter.
The triggering module 40 can output different electrical signals to the control module 10 according to different levels output by the output end of the comparator U1B, so that the control module 10 can determine whether the target voltage sampled by the non-inverting input end of the comparator U1B is abnormal according to the different electrical signals, thereby determining whether protection needs to be started. The specific circuit configuration of the trigger module 40 will be described below.
The trigger module 40 is connected with the output end of the comparator U1B and the control module 10, when the output end of the comparator U1B outputs a low level, the trigger module 40 outputs a first electric signal to the control module 10, and the control module 10 judges that the target voltage sampled by the non-inverting input end of the comparator U1B is normal according to the first electric signal, so that protection cannot be started.
Based on the protection circuit 1 in the embodiment of the present application, during the power-up process of the energy storage inverter, even if the target voltage sampled by the positive input end of the comparator U1B is smaller than the reference voltage V REF accessed by the negative input end of the comparator U1B, the output end of the comparator U1B still maintains a high-resistance state (i.e., outputs a high level by default), but by designing the protection module 30, the protection module 30 can clamp the voltage of the output end of the comparator U1B at a low level during the power-up process of the energy storage inverter, and the triggering module 40 outputs a first electrical signal to the control module 10 when the output end of the comparator U1B outputs a low level, the control module 10 determines that the target voltage sampled by the positive input end of the comparator U1B is normal according to the first electrical signal, and the control module 10 does not start protection, thereby effectively avoiding error protection during the power-up process of the energy storage inverter, and ensuring that the energy storage inverter can be normal.
Further, as shown in fig. 2, considering that, due to the characteristics of the comparator U1B, during the power-up process of the energy storage inverter, even if the target voltage sampled by the non-inverting input terminal of the comparator U1B is smaller than the reference voltage V REF connected to the inverting input terminal of the comparator U1B, the output terminal of the comparator U1B will default output a high level (i.e. the output terminal of the comparator U1B presents a high impedance state). In order to enable the output of the comparator U1B to be clamped to a low level by the protection module 30, the protection module 30 is designed to include a first diode D1 and a clamping unit. The anode of the first diode D1 is connected with the output end of the comparator U1B; the clamping unit is connected with the cathode of the first diode D1, and can clamp the voltage of the cathode of the first diode D1 at a low level in the power-on process of the energy storage inverter.
The following applies to the power-on process of the energy storage inverter, and combines the first diode D1 and the clamping unit to develop and introduce the working principle of the protection module 30:
In the power-on process of the energy storage inverter, since the clamping unit can clamp the voltage of the cathode of the first diode D1 at a low level, the first diode D1 is positively conducted at this time, according to the conduction characteristic of the first diode D1, the voltage difference between the anode of the first diode D1 and the cathode of the first diode D1 is always limited to be the voltage drop of the first diode D1 (if the first diode D1 is a silicon diode, the voltage difference between the anode of the first diode D1 and the cathode of the first diode D1 is 0.7V, namely the voltage drop of the silicon diode is 0.7V, if the first diode D1 is a germanium diode, the voltage difference between the anode of the first diode D1 and the cathode of the first diode D1 is 0.3V, namely the voltage drop of the germanium diode), the voltage of the anode of the first diode D1 is limited to be the voltage drop of the first diode D1 (if the first diode D1 is a silicon diode, the voltage difference between the anode of the first diode D1 and the cathode of the first diode D1 is 0.7V, namely the voltage difference between the anode of the first diode D1 and the second diode D1 is not normally triggered by the first diode D1 and the output module 10, and the output of the comparator is normally triggered by the first voltage-down control module 10 under the first diode D1 and the control module is not triggered.
Through design first diode D1 and clamping unit, in the energy storage inverter power supply power-on process, even if the target voltage that the normal phase input terminal of comparator U1B sampled is less than the reference voltage V REF that the inverting input terminal of comparator U1B inserts, under the circumstances that the output of comparator U1B still can defaults to export high level, the output of comparator U1B can be clamped to low level under first diode D1 and clamping unit effect, and trigger module 40 sends first electrical signal to control module 10 according to the low level that the output of comparator U1B exports, control module 10 judges according to this first electrical signal that the target voltage that the normal phase input terminal of comparator U1B sampled is normal and can not start the protection, thereby effectively avoid the mistake protection.
As shown in fig. 2, considering that the clamping unit can clamp the voltage of the cathode of the first diode D1 at a low level during the power-up process of the energy storage inverter, in order to enable the clamping unit to have a corresponding function, the clamping unit is designed to include a first capacitor C1 and a first resistor R1. The first polar plate of the first capacitor C1 is connected with the cathode of the first diode D1, and the second polar plate of the first capacitor C1 is grounded; the first end of the first resistor R1 is used for being connected with a power supply voltage VCC, and the second end of the first resistor R1 is connected with the cathode of the first diode D1.
The following is an expansion description of the working principle of the protection module 30 by combining the first diode D1, the first capacitor C1 and the first resistor R1 in the power-on process of the energy storage inverter:
When the energy storage inverter power supply is just started to be electrified, the first capacitor C1 does not store electric quantity, and the voltage at the two ends of the first capacitor C1 is 0V. According to the turn-on characteristic of the first diode D1, the voltage difference between the anode of the first diode D1 and the cathode of the first diode D1 is always limited to the voltage drop of the first diode D1. In the power-on process of the energy storage inverter, the voltage of the first polar plate of the first capacitor C1 is the same as the voltage of the cathode of the first diode D1 and equal to 0V, so the voltage of the anode of the first diode D1 is limited to the voltage drop of the first diode D1, at this time, the output end of the comparator U1B is clamped to a low level under the action of the first diode D1 and the first capacitor C1, and the trigger module 40 sends a first electrical signal to the control module 10 when the output end of the comparator U1B outputs the low level, and the control module 10 judges that the target voltage sampled by the positive input end of the comparator U1B is normal according to the first electrical signal, so that protection cannot be started.
In addition, it should be noted that, during the power-up process of the energy storage inverter, the power supply voltage VCC charges the first capacitor C1 through the first resistor R1, but because the resistance of the first resistor R1 is relatively large, the speed of charging the first capacitor C1 by the power supply voltage VCC through the first resistor R1 is very slow, so it can be considered that the voltage across the first capacitor C1 is close to 0V during the power-up process of the energy storage inverter.
It can be understood that after the energy storage inverter is powered on stably, if the target voltage sampled by the non-inverting input end of the comparator U1B is greater than the reference voltage V REF accessed by the inverting input end of the comparator U1B, the output end of the comparator U1B will normally output a high level, and at this time, the target voltage sampled by the non-inverting input end of the comparator U1B is abnormal, and the control module 10 needs to start protection. Therefore, after the energy storage inverter is powered on stably, the trigger module 40 outputs a second electrical signal different from the first electrical signal to the control module 10 when the output end of the comparator U1B outputs a high level, so that the control module 10 turns on protection.
After receiving the second control signal, the control module 10 turns on the protection, for example, the control module 10 can control the whole energy storage inverter to be immediately turned off or enter a standby state, or can control the alarm module of the energy storage inverter to alarm for a period of time before controlling the whole energy storage inverter to be turned off or enter the standby state.
The following is an introduction to develop the working principle of the protection module 30 by combining the first diode D1, the first capacitor C1 and the first resistor R1 after the energy storage inverter power supply is powered on stably:
After the energy storage inverter power supply is electrified and stabilized, the power supply voltage VCC can continuously charge the first capacitor C1 through the first resistor R1 until the first capacitor C1 is fully charged, namely, the voltage at two ends of the first capacitor C1 is the power supply voltage VCC. At this time, the voltage of the cathode of the first diode D1 is greater than the voltage of the anode of the first diode D1, and the first diode D1 is turned off reversely. Based on this, if the target voltage sampled by the non-inverting input terminal of the comparator U1B is greater than the reference voltage V REF accessed by the inverting input terminal of the comparator U1B, the output terminal of the comparator U1B outputs a high level (i.e., the output terminal of the comparator U1B presents a high resistance state), at this time, the output terminal of the comparator U1B cannot be clamped to a low level by the first diode D1 and the first capacitor C1, and the output terminal of the comparator U1B still keeps a high level output, and the trigger module 40 sends a second electrical signal to the control module 10 when the output terminal of the comparator U1B outputs a high level, and the control module 10 determines that the target voltage sampled by the non-inverting input terminal of the comparator U1B is abnormal according to the second electrical signal, so that protection can be started in time. On the contrary, if the target voltage sampled by the non-inverting input terminal of the comparator U1B is smaller than the reference voltage V REF accessed by the inverting input terminal of the comparator U1B, the output terminal of the comparator U1B outputs a low level (i.e., the output terminal of the comparator U1B presents a low resistance state), and the trigger module 40 sends the first electrical signal to the control module 10 when the output terminal of the comparator U1B outputs a low level, the control module 10 determines that the target voltage sampled by the non-inverting input terminal of the comparator U1B is normal according to the first electrical signal, so that the protection will not be started.
In addition, it should be noted that, after the control module 10 determines that the target voltage sampled at the non-inverting input end of the comparator U1B is abnormal and the protection is turned on according to the second electrical signal, the energy storage inverter power supply is powered down, the power supply voltage VCC becomes 0V, and the first capacitor C1 is rapidly discharged to 0V through the first resistor R1. The design is so designed that the operation is continuously realized when the energy storage inverter power supply is powered on again next time, and the target function is realized.
Of course, in other embodiments, the protection module 30 may include a triode, where an emitter of the triode is connected to the output end of the comparator U1B, an emitter of the triode is grounded, a base of the triode is connected to the control module 10, and during the power-up process of the energy storage inverter, the control module 10 controls the base of the triode to make the triode in a conducting state, so that the output end of the comparator U1B is pulled down to a low level through the triode, thereby avoiding starting the error protection. After the energy storage inverter is powered on stably, the control module 10 controls the base electrode of the triode so as to enable the triode to be in an off state, and based on the base electrode, if the target voltage sampled by the non-inverting input end of the comparator U1B is larger than the reference voltage V REF accessed by the inverting input end of the comparator U1B, the output end of the comparator U1B outputs a high level, and at the moment, the target voltage sampled by the non-inverting input end of the comparator U1B is abnormal, the control module 10 starts protection.
Further, as shown in fig. 2, in some embodiments, the voltage comparison module 20 further includes a first voltage dividing resistor R EF1, a second voltage dividing resistor R EF2, and a second resistor R2; the first end of the first voltage dividing resistor R EF1 is used for being connected with a power supply voltage VCC, and the second end of the first voltage dividing resistor R EF1 is connected with the inverting input end of the comparator U1B; the first end of the second voltage dividing resistor R EF2 is connected with the second end of the first voltage dividing resistor R EF1, and the second end of the second voltage dividing resistor R EF2 is grounded; the first end of the second resistor R2 is used for accessing the power supply voltage VCC, and the second end of the second resistor R2 is connected with the output end of the comparator U1B.
The first voltage dividing resistor R EF1 and the second voltage dividing resistor R EF2 form a voltage dividing circuit, the power supply voltage VCC is a voltage across a branch formed by connecting the first voltage dividing resistor R EF1 and the second voltage dividing resistor R EF2 in series, and the reference voltage V REF is a voltage division of the power supply voltage VCC across the second voltage dividing resistor R EF2, that is, V REF＝VCC*REF2/(REF1+REF2. And it can be understood that the designer can reasonably design the resistance values of the first voltage dividing resistor R EF1 and the second voltage dividing resistor R EF2 according to actual needs, so as to obtain the reference voltage V REF required as the reference quantity.
Specifically, as shown in fig. 2, other structural designs for the voltage comparison module 20 may be, but are not limited to, one or more of the following embodiments.
In the first embodiment, the voltage comparing module 20 further includes a third resistor R3, a first end of the third resistor R3 is used for accessing the target voltage, and a second end of the third resistor R3 is connected to the non-inverting input terminal of the comparator U1B. So designed, the third resistor R3 mainly plays a role of hysteresis.
In the second embodiment, the voltage comparing module 20 further includes a fourth resistor R4, a first end of the fourth resistor R4 is connected to the non-inverting input terminal of the comparator U1B, and a second end of the fourth resistor R4 is connected to the output terminal of the comparator U1B. So designed, the fourth resistor R4 mainly plays a role of hysteresis.
In a third embodiment, the voltage comparison module 20 further includes a second capacitor C2, a first plate of the second capacitor C2 is connected to the non-inverting input terminal of the comparator U1B, and a second plate of the second capacitor C2 is grounded. By the design, the second capacitor C2 realizes filtering, interference components in the voltage comparison module 20 are reduced, and accordingly reliability of the voltage comparison module 20 is improved.
In a fourth embodiment, the voltage comparing module 20 further includes a third capacitor C3, a first plate of the third capacitor C3 is connected to the inverting input terminal of the comparator U1B, and a second plate of the third capacitor C3 is connected to the second terminal of the second voltage dividing resistor R EF2. By the design, the third capacitor C3 realizes filtering, interference components in the voltage comparison module 20 are reduced, and accordingly reliability of the voltage comparison module 20 is improved.
As shown in fig. 2, it is considered that the trigger module 40 outputs a first electrical signal to the control module 10 when the output terminal of the comparator U1B outputs a low level so that the control module 10 does not turn on protection, and outputs a second electrical signal to the control module 10 when the output terminal of the comparator U1B outputs a high level so that the control module 10 turns on protection. In order to make the triggering module 40 have a corresponding function, the triggering module 40 is designed to include a switching tube Q1, a controlled end of the switching tube Q1 is connected with an output end of the comparator U1B, a first connection end of the switching tube Q1 is used for accessing the supply voltage VCC, a first connection end of the switching tube Q1 is also connected with the control module 10, and a second connection end of the switching tube Q1 is grounded.
The switching transistor Q1 has an "on state" and an "off state", and the specific embodiment of the switching transistor Q1 may be, but is not limited to, one of a triode and a field effect transistor. For example, when the switch Q1 is embodied as a transistor, if the transistor is in a "conductive state", the collector of the transistor and the emitter of the transistor are conductive; otherwise, if the triode is in an 'off state', the collector of the triode and the emitter of the triode are disconnected. For another example, when the concrete expression form of the switch tube Q1 is a field effect tube, if the field effect tube is in a "conducting state", the source electrode of the field effect tube and the drain electrode of the field effect tube are conducted; otherwise, if the field effect transistor is in the off state, the source electrode of the field effect transistor and the drain electrode of the field effect transistor are disconnected.
Specifically, the triggering module 40 further includes a second diode D2, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7; the anode of the second diode D2 is connected with the output end of the comparator U1B; the first end of the fifth resistor R5 is connected with the cathode of the second diode D2, and the second end of the fifth resistor R5 is connected with the controlled end of the switching tube Q1; the first end of the sixth resistor R6 is used for being connected with a power supply voltage VCC, the second end of the sixth resistor R6 is connected with the first connecting end of the switching tube Q1, and the second end of the sixth resistor R6 is also connected with the control module 10; the first end of the seventh resistor R7 is connected with the controlled end of the switching tube Q1, and the second end of the seventh resistor R7 is connected with the second connecting end of the switching tube Q1 to the ground. After the energy storage inverter power supply is powered on stably, when a fault occurs in the power storage inverter power supply, the anode of the second diode D2 is connected to the power supply voltage VCC through the second resistor R2 to quickly become high level, and the delay is very small.
The operation principle of the trigger module 40 will be described below by taking the switching transistor Q1 as an NPN transistor as an example.
For the energy storage inversion power supply in the power-on process: the output terminal of the comparator U1B is clamped at a low level under the action of the first diode D1 and the first capacitor C1, the low level acts on the anode of the second diode D2 to reversely cut off the second diode D2, and at this time, the voltage of the base electrode of the NPN type triode is smaller than the voltage of the collector electrode of the NPN type triode, so that the NPN type triode is in an off state, the power supply voltage VCC outputs a high level (i.e., the first electrical signal) to the control module 10 through the sixth resistor R6, and the control module 10 does not start protection according to the high level.
For the energy storage inverter power supply after power-on stabilization: if the target voltage sampled by the non-inverting input terminal of the comparator U1B is smaller than the reference voltage V REF of the inverting input terminal of the comparator U1B, the output terminal of the comparator U1B outputs a low level, the low level acts on the anode of the second diode D2 to reversely cut off the second diode D2, and at this time, the voltage of the base of the NPN transistor is smaller than the voltage of the collector of the NPN transistor, so that the NPN transistor is in an off state, the power supply voltage VCC outputs a high level (i.e., the first electrical signal) to the control module 10 through the sixth resistor R6, and the control module 10 does not start protection according to the high level. If the target voltage sampled by the non-inverting input terminal of the comparator U1B is greater than the reference voltage V REF of the inverting input terminal of the comparator U1B, the high level acts on the anode of the second diode D2 to make the second diode D2 conduct forward, and at this time, the voltage of the base of the NPN transistor is greater than the voltage of the collector of the NPN transistor, so that the NPN transistor is in a conducting state, the second terminal of the sixth resistor R6 is pulled down to ground through the NPN transistor, thereby outputting a low level to the control module 10, and the control module 10 starts protection according to the low level.
Further, as shown in fig. 2, in some embodiments, the triggering module 40 further includes a fourth capacitor C4, a first electrode of the fourth capacitor C4 is connected to the controlled terminal of the switching tube Q1, and a second electrode of the fourth capacitor C4 is connected to the second connection terminal of the switching tube Q1 and ground. By the design, the fourth capacitor C4 realizes filtering, interference components in the trigger module 40 are reduced, and accordingly reliability of the trigger module 40 is improved.
The second aspect of the present application proposes an energy storage inverter power supply (not shown in the drawings), which includes a circuit board and the protection circuit 1, wherein the protection circuit 1 is fabricated on the circuit board. In this design, have above-mentioned protection circuit 1's energy storage inverter, can effectively avoid energy storage inverter to power up the in-process and appear the mistake protection to guarantee that energy storage inverter can normally start.
A third aspect of the present application provides a photovoltaic energy storage inverter system (not shown in the figure), which includes a photovoltaic module and the energy storage inverter power supply described above, and the photovoltaic module is connected to the energy storage inverter power supply. In the design, the photovoltaic energy storage inversion system with the energy storage inversion power supply can effectively avoid error protection in the power-on process of the energy storage inversion power supply so as to ensure that the energy storage inversion power supply can be started normally; in addition, the user can correspondingly move and assemble the photovoltaic module, the energy storage inverter power supply and the load according to the actual application environment so as to meet the electricity consumption requirements of the user in different application scenes.
In the photovoltaic energy storage inversion system, a photovoltaic module, an energy storage inversion power supply and a load are mutually independent components. The user can correspondingly assemble the photovoltaic module, the energy storage inverter power supply and the load according to the practical application environment. For example, in a cloudy day application environment, a user may simply assemble a load with the energy storage inverter power source to achieve the power supply requirement of the energy storage inverter power source to the load. For another example, in a sunny application environment, a user can only assemble the photovoltaic module with the energy storage inverter power supply together so as to realize the power supply requirement of the photovoltaic module on the energy storage inverter power supply.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present application and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (11)
1. A protection circuit for use with an energy storage inverter power supply, the protection circuit comprising:
A control module;
the voltage comparison module comprises a comparator, wherein the non-inverting input end of the comparator is used for sampling target voltage, and the inverting input end of the comparator is used for accessing reference voltage;
The protection module is connected with the output end of the comparator and can clamp the voltage of the output end of the comparator at a low level in the process of powering on the energy storage inverter;
And the triggering module is connected with the output end of the comparator and the control module, and outputs a first electric signal to the control module when the output end of the comparator outputs a low level so that the control module does not start protection.
2. The protection circuit of claim 1, wherein the protection module comprises:
The anode of the first diode is connected with the output end of the comparator;
And the clamping unit is connected with the cathode of the first diode and can clamp the voltage of the cathode of the first diode at a low level in the power-on process of the energy storage inverter.
3. The protection circuit of claim 2, wherein the clamping unit comprises:
The first polar plate of the first capacitor is connected with the cathode of the first diode, and the second polar plate of the first capacitor is grounded;
The first end of the first resistor is used for being connected with a power supply voltage, and the second end of the first resistor is connected with the cathode of the first diode.
4. A protection circuit according to any one of claims 1-3, wherein the voltage comparison module further comprises:
The first end of the first voltage dividing resistor is used for being connected with a power supply voltage, and the second end of the first voltage dividing resistor is connected with the inverting input end of the comparator;
The first end of the second voltage dividing resistor is connected with the second end of the first voltage dividing resistor, and the second end of the second voltage dividing resistor is grounded;
And the first end of the second resistor is used for being connected with the power supply voltage, and the second end of the second resistor is connected with the output end of the comparator.
5. The protection circuit of claim 4, wherein the voltage comparison module further comprises:
the first end of the third resistor is used for being connected with the target voltage, and the second end of the third resistor is connected with the non-inverting input end of the comparator; and/or
And the first end of the fourth resistor is connected with the non-inverting input end of the comparator, and the second end of the fourth resistor is connected with the output end of the comparator.
6. The protection circuit of claim 5, wherein the voltage comparison module further comprises:
The first polar plate of the second capacitor is connected with the non-inverting input end of the comparator, and the second polar plate of the second capacitor is grounded; and/or
And the first polar plate of the third capacitor is connected with the inverting input end of the comparator, and the second polar plate of the third capacitor is connected with the second end of the second voltage dividing resistor to be grounded.
7. A protection circuit according to any one of claims 1 to 3, wherein the trigger module comprises:
The controlled end of the switching tube is connected with the output end of the comparator, the first connecting end of the switching tube is used for being connected with the power supply voltage and the control module, and the second connecting end of the switching tube is grounded.
8. The protection circuit of claim 7, wherein the trigger module further comprises:
The anode of the second diode is connected with the output end of the comparator;
The first end of the fifth resistor is connected with the cathode of the second diode, and the second end of the fifth resistor is connected with the controlled end of the switching tube;
The first end of the sixth resistor is used for being connected with the power supply voltage, the second end of the sixth resistor is connected with the first connecting end of the switching tube, and the second end of the sixth resistor is also connected with the control module;
And the first end of the seventh resistor is connected with the controlled end of the switching tube, and the second end of the seventh resistor is connected with the second connecting end of the switching tube to be grounded.
9. The protection circuit of claim 8, wherein the trigger module further comprises:
And the first polar plate of the fourth capacitor is connected with the controlled end of the switching tube, and the second polar plate of the fourth capacitor is connected with the second connecting end of the switching tube to the ground.
10. An energy storage inverter power supply, comprising:
a circuit board; and
The protection circuit of any one of claims 1-9, the protection circuit being provided to the circuit board.
11. A photovoltaic energy storage inverter system, comprising:
The energy storage inverter of claim 10; and
And the photovoltaic module is connected with the energy storage inverter power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322608268.0U CN220985548U (en) | 2023-09-25 | 2023-09-25 | Protection circuit, energy storage inversion power supply and photovoltaic energy storage inversion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322608268.0U CN220985548U (en) | 2023-09-25 | 2023-09-25 | Protection circuit, energy storage inversion power supply and photovoltaic energy storage inversion system |
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| Publication Number | Publication Date |
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| CN220985548U true CN220985548U (en) | 2024-05-17 |
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| CN202322608268.0U Active CN220985548U (en) | 2023-09-25 | 2023-09-25 | Protection circuit, energy storage inversion power supply and photovoltaic energy storage inversion system |
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| CN (1) | CN220985548U (en) |
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2023
- 2023-09-25 CN CN202322608268.0U patent/CN220985548U/en active Active
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