CN220874218U - Voltage hysteresis protection circuit, micro inverter and photovoltaic module - Google Patents
Voltage hysteresis protection circuit, micro inverter and photovoltaic module Download PDFInfo
- Publication number
- CN220874218U CN220874218U CN202322580322.5U CN202322580322U CN220874218U CN 220874218 U CN220874218 U CN 220874218U CN 202322580322 U CN202322580322 U CN 202322580322U CN 220874218 U CN220874218 U CN 220874218U
- Authority
- CN
- China
- Prior art keywords
- voltage
- resistor
- reference voltage
- comparator
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005070 sampling Methods 0.000 claims abstract description 50
- 230000007246 mechanism Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The application relates to a voltage hysteresis protection circuit, a micro inverter and a photovoltaic module, wherein the voltage hysteresis protection circuit comprises a comparator, the non-inverting input end of the comparator is connected with a voltage dividing circuit, and the inverting input end of the comparator is connected with a sampling voltage; the voltage dividing circuit comprises a first resistor and a second resistor which are connected in series; and a hysteresis circuit is connected between the positive input end and the output end of the comparator, and comprises a diode and a third resistor, wherein the positive electrode of the diode is close to the positive input end of the comparator. According to the application, the hysteresis circuit is added in the protection circuit, so that the reference voltage can be reduced after the trigger circuit is protected, and the fault signal can be released after the protected sampling voltage completely recovers to be normal, thus, when the sampling voltage repeatedly fluctuates around the reference voltage, the protection state can not be repeatedly entered, and the problem that the existing protection circuit in the related art is easy to frequently enter the protection state is solved.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a voltage hysteresis protection circuit, a micro inverter and a photovoltaic module.
Background
In research and development and application of power electronic products, a circuit protection function is particularly important, and can play a decisive role in stability of the products, such as overvoltage protection, overcurrent protection, over-temperature protection and the like, and if a circuit protection mechanism malfunctions, the whole system can be damaged.
The common protection circuit applies reference voltage to one side of the input end of the comparator, the other side is connected with a voltage signal to be protected, a circuit protection mechanism is triggered immediately when the voltage signal to be protected is larger than the reference voltage, and the normal working circuit is restored quickly when the voltage signal to be protected falls below the reference voltage, so that the circuit protection functions of overvoltage, overcurrent, overtemperature and the like can be realized quickly and effectively. However, the reference voltage is a fixed value, when the voltage signal to be protected is a high-frequency signal and repeatedly fluctuates up and down in the vicinity of the reference voltage value, the whole system is frequently in a protection state, and the breakdown of the frying machine is caused when the voltage signal to be protected is severe.
Aiming at the problem that the existing protection circuit in the related technology easily causes frequent entering of the protection state, no effective solution is proposed at present.
Disclosure of utility model
In this embodiment, a voltage hysteresis protection circuit, a micro inverter and a photovoltaic module are provided to solve the problem that the existing protection circuit in the related art is easy to cause frequent entering into a protection state.
In a first aspect, in this embodiment, a voltage hysteresis protection circuit is provided, including: the non-inverting input end of the comparator is connected with the voltage dividing circuit, and the inverting input end of the comparator is connected with the sampling voltage;
The voltage dividing circuit comprises a first resistor and a second resistor which are connected in series;
and a hysteresis circuit is connected between the positive input end and the output end of the comparator, the hysteresis circuit comprises a diode and a third resistor, and the positive electrode of the diode is close to the positive input end of the comparator.
In some embodiments, the voltage dividing circuit is connected to a power supply voltage and is used for dividing the power supply voltage.
In some embodiments, the first resistor and the second resistor divide the power supply voltage to obtain a first reference voltage;
When the circuit is in a normal state, the sampling voltage is lower than the first reference voltage, the comparator outputs a high level, and the diode is not conducted;
And when the circuit is in a fault state, the sampling voltage is higher than the first reference voltage, the comparator outputs a low level, the diode is conducted, the first resistor, the second resistor and the third resistor divide the power supply voltage to obtain a second reference voltage, and the second reference voltage is lower than the first reference voltage.
In some of these embodiments, the output of the comparator remains low when the sampled voltage returns below the first reference voltage.
In some of these embodiments, the comparator outputs a high level when the sampled voltage returns to be lower than the second reference voltage.
In some of these embodiments, the third resistor is used to regulate the second reference voltage.
In some of these embodiments, the first reference voltage and the second reference voltage differ by 1V.
In some embodiments, the second resistor has a resistance value greater than or equal to a resistance value of the third resistor.
In a second aspect, in this embodiment, there is provided a micro inverter including: the voltage hysteresis protection circuit of the first aspect.
In a third aspect, in this embodiment, there is provided a photovoltaic module including: a photovoltaic panel, and a micro-inverter as described in the second aspect.
Compared with the related art, the voltage hysteresis protection circuit, the micro inverter and the photovoltaic module provided in the embodiment can reduce the reference voltage after the trigger circuit is protected by adding the hysteresis circuit into the protection circuit until the protected sampling voltage completely recovers to be normal, and then the fault signal is released, so that when the sampling voltage repeatedly fluctuates up and down around the reference voltage, the protection state is not repeatedly entered, and the problem that the existing protection circuit in the related art easily causes frequent entering of the protection state is solved.
The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic diagram of a voltage hysteresis protection circuit in one embodiment.
Detailed Description
The present application will be described and illustrated with reference to the accompanying drawings and examples for a clearer understanding of the objects, technical solutions and advantages of the present application.
Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "a," "an," "the," "these" and similar terms in this application are not intended to be limiting in number, but may be singular or plural. The terms "comprising," "including," "having," and any variations thereof, as used herein, are intended to encompass non-exclusive inclusion; for example, a process, method, and system, article, or apparatus that comprises a list of steps or modules (units) is not limited to the list of steps or modules (units), but may include other steps or modules (units) not listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in this disclosure are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. Typically, the character "/" indicates that the associated object is an "or" relationship. The terms "first," "second," "third," and the like, as referred to in this disclosure, merely distinguish similar objects and do not represent a particular ordering for objects.
In research and development and application of power electronic products, a circuit protection function is particularly important, and can play a decisive role in stability of the products, such as overvoltage protection, overcurrent protection, over-temperature protection and the like, and if a circuit protection mechanism malfunctions, the whole system can be damaged.
The common protection circuit applies reference voltage to one side of the input end of the comparator, the other side is connected with a voltage signal to be protected, a circuit protection mechanism is triggered immediately when the voltage signal to be protected is larger than the reference voltage, and the normal working circuit is restored quickly when the voltage signal to be protected falls below the reference voltage, so that the circuit protection functions of overvoltage, overcurrent, overtemperature and the like can be realized quickly and effectively. However, the reference voltage is a fixed value, when the voltage signal to be protected is a high-frequency signal and repeatedly fluctuates up and down in the vicinity of the reference voltage value, the whole system is frequently in a protection state, and the breakdown of the frying machine is caused when the voltage signal to be protected is severe.
In this embodiment, a voltage hysteresis protection circuit is provided, fig. 1 is a schematic diagram of the voltage hysteresis protection circuit in this embodiment, as shown in fig. 1, and the voltage hysteresis protection circuit includes: the non-inverting input end of the comparator U 1 is connected with the voltage dividing circuit, and the inverting input end of the comparator U 1 is connected with the sampling voltage V in; the voltage dividing circuit comprises a first resistor R 1 and a second resistor R 2 which are connected in series; a hysteresis circuit is connected between the non-inverting input end and the output end of the comparator U 1, and comprises a diode D 1 and a third resistor R 3, and the anode of the diode D 1 is close to the non-inverting input end of the comparator U 1.
The non-inverting input terminal of the comparator U 1 is connected to the reference voltage V ref, the inverting input terminal is connected to the sampling voltage V in, and the output terminal of the comparator U 1 outputs the comparison voltage V out, where the comparison voltage is used to represent the comparison result of the reference voltage V ref and the sampling voltage V in.
The reference voltage V ref is obtained by dividing the voltage by a first resistor R 1 and a second resistor R 2 in the voltage dividing circuit, the first resistor R 1 is connected to the non-inverting input terminal of the comparator U 1, one end of the second resistor R 2 is connected between the first resistor R 1 and the non-inverting input terminal of the comparator U 1, and the other end is Grounded (GND). The reference voltage V ref obtained by the voltage division is not affected by the outside. When the comparison voltage V out outputs a high level, it indicates that the sampling voltage V in is smaller than the reference voltage V ref; when the comparison voltage V out outputs a low level, indicating that a fault signal is generated, the sampling voltage V in is greater than the reference voltage V ref.
A hysteresis circuit is connected between the non-inverting input end and the output end of the comparator D 1, and comprises a diode D 1 and a third resistor R 3, and the anode of the diode D 1 is close to the non-inverting input end of the comparator D 1. When a fault signal is generated, the diode D 1 in the hysteresis circuit is conducted, and the third resistor R 3 is connected into the circuit and is connected with the second resistor R 2 in parallel, so that the reference voltage V ref at the non-phase input end of the comparator U 1 is reduced.
The voltage hysteresis protection circuit in this embodiment can be applied to overvoltage protection and overcurrent protection, and the sampling voltage V in is a protected voltage signal value. When applied to overvoltage protection, the sampled voltage V in is the voltage signal value that is protected in the circuit; when applied to over-current protection, the sampled voltage V in is the voltage signal value resulting from the conversion of the protected current signal in the circuit.
According to the voltage hysteresis protection circuit, the hysteresis circuit is added, the diode D 1 in the hysteresis circuit is conducted after the trigger circuit is protected, the third resistor R 3 access circuit is connected with the second resistor R 2 in parallel, the reference voltage of the positive input end of the comparator U 1 can be reduced, so that when the sampling voltage repeatedly fluctuates up and down around the reference voltage, the protection state cannot be repeatedly entered, the fault signal can be relieved until the protected sampling voltage completely recovers to be normal, and the problem that the existing protection circuit in the related art easily causes frequent entering of the protection state is solved.
In some embodiments, as shown in fig. 1, the voltage dividing circuit is connected to the power supply voltage Vcc (Volt Current Condenser) for performing voltage dividing processing on the power supply voltage Vcc.
The voltage divider circuit is externally connected with the power supply voltage Vcc, one end of a first resistor R 1 in the voltage divider circuit is connected with the power supply voltage Vcc, the other end of the first resistor R 1 is connected with the non-inverting input end of the comparator U 1, one end of a second resistor R 2 is connected between the first resistor R 1 and the non-inverting input end of the comparator U 1, and the other end of the second resistor R 2 is Grounded (GND). The first resistor R 1 and the second resistor R 2 divide the power supply voltage Vcc to obtain a reference voltage of the non-inverting input terminal of the comparator U 1.
In this embodiment, the voltage division circuit divides the external power supply voltage Vcc to separate the power supply voltage Vcc into different voltages through the first resistor R 1 and the second resistor R 2, so as to achieve proportional distribution, and obtain the reference voltage of the non-inverting input terminal of the comparator U 1.
In some embodiments, the first resistor R 1 and the second resistor R 2 divide the power supply voltage Vcc to obtain the first reference voltage V ref1.
When the circuit is in a normal state, the sampling voltage V in is lower than the first reference voltage V ref1, the comparator U 1 outputs a high level, and the diode D 1 is not conducted; in the fault state of the circuit, the sampling voltage V in is higher than the first reference voltage V ref1, the comparator U 1 outputs a low level, the diode D 1 is turned on, the first resistor R 1, the second resistor R 2 and the third resistor R 3 divide the power voltage Vcc to obtain the second reference voltage V ref2, and the second reference voltage V ref2 is lower than the first reference voltage V ref1.
The first resistor R 1 and the second resistor R 2 divide the power supply voltage Vcc to obtain a first reference voltage V ref1 at the non-inverting input end of the comparator U 1, where the first reference voltage V ref1 is a voltage obtained by distributing the second resistor R 2 and the first resistor R 1 according to a ratio of resistance values.
In the normal state of the circuit, the sampling voltage V in at the input end of the comparator U 1 is lower than the first reference voltage V ref1, the output end of the comparator U 1 outputs the comparison voltage V out as a high level, and the diode D 1 is not conductive.
In the fault state of the circuit, the sampling voltage V in in the circuit is unstable, and an overvoltage phenomenon may occur, the sampling voltage V in is higher than the first reference voltage V ref1, the output end of the comparator U 1 outputs the comparison voltage V out as a low level, so that the diode D 1 is turned on, at this time, the third resistor R 3 is connected to the circuit in parallel with the second resistor R 2 and then connected in series with the first resistor R 1, the first resistor R 1, the second resistor R 2 and the third resistor R 3 divide the power supply voltage Vcc to obtain the second reference voltage V ref2, and the second reference voltage V ref2 is the voltage obtained by distributing the second reference voltage V 2 and the third resistor R 3 in parallel with the first resistor R 1 according to the ratio of the resistance values.
Since the power voltage Vcc is a fixed voltage value, the second resistor R 2 is connected in parallel with the third resistor R 3 and then divided by the first resistor R 1, so that the second reference voltage V ref2 is lower than the first reference voltage V ref1.
In this embodiment, when a fault signal is generated in a circuit fault state through the diode D 1 and the third resistor R 3 in the hysteresis circuit, the diode D 1 is turned on, and the third resistor R 3 is connected to the circuit and is arranged in parallel with the second resistor R 2, so that the reference voltage V ref at the positive input end of the comparator U 1 can be reduced, and even if the sampling voltage V in fluctuates repeatedly around the first reference voltage V ref1, the comparison voltage V out output by the output end of the comparator U 1 does not switch between a high level and a low level under the limitation of the second reference voltage V ref2.
In some of these embodiments, the output of comparator U 1 remains low when the sampled voltage V in returns below the first reference voltage V ref1.
In the above circuit fault state, the sampling voltage V in triggers the circuit protection, the protection circuit is restarted after the power circuit is turned off for a short period of time, and the sampling voltage V in quickly drops and returns to be lower than the original first reference voltage V ref1 in a short time due to the triggering of the circuit protection, but such voltage fluctuation does not represent that the sampling voltage V in has completely recovered.
After the trigger circuit is protected, the reference voltage at the non-inverting input terminal of the comparator U 1 is reduced from the first reference voltage V ref1 to the second reference voltage V ref2, so that even if the sampling voltage V in is quickly reduced and is restored to be lower than the original first reference voltage V ref1 in a short time, the comparison voltage V out output by the output terminal of the comparator U 1 remains at a low level, and the fault signal is not released.
Further, when the sampling voltage V in is restored to be lower than the second reference voltage V ref2, the comparator U 1 outputs a high level.
At the input end of the comparator U 1, when the sampling voltage V in is recovered to be lower than the second reference voltage V ref2, the comparator U 1 outputs the comparison voltage V out of the sampling voltage V in and the second reference voltage V ref2 to be at a high level, at this time, the fault signal is cleared, and the circuit is recovered to be in a normal state.
After the trigger circuit is protected in the embodiment, the reference voltage at the non-inverting input end of the comparator U 1 is reduced from the first reference voltage V ref1 to the second reference voltage V ref2, so that the comparison voltage V out output by the output end of the comparator U 1 is still kept at a low level even if the sampling voltage V in is quickly reduced and is restored to be lower than the original first reference voltage V ref1 in a short time, and the situation that the sampling voltage V in repeatedly fluctuates in a short time to cause the comparison voltage V out of the comparator U 1 to jump back and forth is effectively avoided.
In some of these embodiments, the third resistor R 3 is used to regulate the second reference voltage V ref2.
When the circuit is in a fault state, the diode D 1 is turned on, and at this time, the third resistor R 3 is connected to the circuit and is connected in parallel with the second resistor R 2, and the second reference voltage V ref2 is a voltage obtained by distributing the second resistor R 2 and the third resistor R 3 in parallel with the first resistor R 1 according to a ratio of resistance values.
By adjusting the resistance value of the third resistor R 3 in the hysteresis circuit, the second reference voltage V ref2 at the non-inverting input end of the comparator U 1 is correspondingly adjusted, so that the second reference voltage V ref2 and the first reference voltage V ref1 keep a certain hysteresis interval, and the resistance value of the third resistor R 3, the second reference voltage V ref2 and the hysteresis interval are set according to specific faults in the protection circuit.
In some of these embodiments, the first reference voltage V ref1 and the second reference voltage V ref2 differ by 1V.
In order to obtain a better voltage hysteresis effect, the hysteresis region between the first reference voltage V ref1 and the second reference voltage V ref2 is usually set to 1V, so that when the sampling signal V in repeatedly fluctuates around the first reference voltage V ref1 in a short time, the sampling signal V in does not recover to be lower than the second reference voltage V ref2, and therefore the protection circuit does not recover to a normal state. The fault signal is released only after the sample signal V in is completely restored, i.e., the sample signal V in is restored to be lower than the second reference voltage V ref2.
In order to make the second reference voltage V ref2 lower than the first reference voltage V ref1 to generate a hysteresis interval in the case of a circuit failure state, the resistance value of the second resistor R 2 is greater than or equal to the resistance value of the third resistor R 3.
When the resistance of the second resistor R 2 is set to be equal to the resistance of the third resistor R 3, for example, the resistances of the second resistor R 2 and the third resistor R 3 are set to be 10K, that is, R 2＝R3 =10k, and the resistances of the second resistor R 2 and the third resistor R 3 after being connected in parallel are set to be 5K, so that the power supply voltage Vcc is divided after being connected in series with the first resistor R 1, and the obtained second reference voltage V ref2 is lower than the first reference voltage V ref1.
The present embodiment is described and illustrated below by way of preferred embodiments.
In the preferred embodiment, a voltage hysteresis protection circuit is provided, as shown in fig. 1, where the voltage hysteresis protection circuit includes: the non-inverting input end of the comparator U 1 is connected with the voltage dividing circuit, and the inverting input end of the comparator U 1 is connected with the sampling voltage V in; the voltage dividing circuit comprises a first resistor R 1 and a second resistor R 2 which are connected in series; a hysteresis circuit is connected between the non-inverting input end and the output end of the comparator U 1, and comprises a diode D 1 and a third resistor R 3, and the anode of the diode D 1 is close to the non-inverting input end of the comparator U 1.
The voltage dividing circuit is externally connected with a power supply voltage Vcc, wherein one end of a first resistor R 1 is connected with the power supply voltage Vcc, the other end of the first resistor R 1 is connected with the positive input end of a comparator U 1, one end of a second resistor R 2 is connected with the positive input end of the comparator U 1, and the other end of the second resistor R 2 is Grounded (GND). The first resistor R 1 and the second resistor R 2 divide the power supply voltage Vcc to obtain a first reference voltage V ref1 at the non-inverting input terminal of the comparator U 1.
The non-inverting input terminal of the comparator U 1 is connected to the first reference voltage V ref1, the inverting input terminal is connected to the sampling voltage V in, and the output terminal of the comparator U 1 outputs a comparison voltage V out, where the comparison voltage is used to represent the comparison result between the first reference voltage V ref1 and the sampling voltage V in.
In the normal state of the circuit, the sampling voltage V in is lower than the first reference voltage V ref1, the comparator U 1 outputs the comparison voltage V out to be high level, and the diode D 1 is not conductive.
In the fault state of the circuit, the sampling voltage V in is higher than the first reference voltage V ref1, the comparator U 1 outputs the comparison voltage V out as a low level, the diode D 1 is turned on, the third resistor R 3 is connected to the circuit and is arranged in parallel with the second resistor R 2, the first resistor R 1, the second resistor R 2 and the third resistor R 3 divide the power supply voltage Vcc to obtain the second reference voltage V ref2, and the second reference voltage V ref2 is the voltage obtained by distributing the second resistor R 2 and the third resistor R 3 in parallel according to the ratio of the resistance values to the first resistor R 1. The second reference voltage V ref2 is lower than the first reference voltage V ref1.
At this time, the non-inverting input terminal of the comparator U 1 is connected to the second reference voltage V ref2, the inverting input terminal is connected to the sampling voltage V in, and the output terminal of the comparator U 1 outputs the comparison voltage V out, which is used to represent the comparison result between the second reference voltage V ref2 and the sampling voltage V in.
When the sampling voltage V in is restored to be lower than the first reference voltage V ref1, the output V out of the comparator U 1 is kept low; when the sampling voltage V in is restored to be lower than the second reference voltage V ref2, the output V out of the comparator U 1 is high.
The resistance value of the second resistor R 2 is greater than or equal to the resistance value of the third resistor R 3, and the third resistor R 3 is used for adjusting the second reference voltage V ref2; the first reference voltage V ref1 and the second reference voltage V ref2 differ by 1V.
By adding the hysteresis circuit in the protection circuit in the preferred embodiment, the diode D 1 in the hysteresis circuit is conducted after the trigger circuit is protected, the third resistor R 3 is connected to the circuit and is parallel to the second resistor R 2, the second reference voltage V ref2 is obtained by distributing the voltage Vcc with the first resistor R 1 according to the ratio of the resistance values after the second resistor R 2 is parallel to the third resistor R 3, so that the second reference voltage V ref2 is lower than the first reference voltage V ref1, and the reference voltage of the positive input end of the comparator U 1 can be effectively reduced. Even if the sampling voltage V in falls rapidly and returns to be lower than the original first reference voltage V ref1 in a short time after the trigger circuit is protected, the comparison voltage V out output by the output end of the comparator U 1 remains at a low level, and the fault signal is not released. Until the sampling voltage V in is recovered to be lower than the second reference voltage V ref2, the comparison voltage V out output by the comparator U 1 is at a high level, the fault signal is cleared, and the circuit is recovered to be in a normal state, so that the situation that the sampling voltage V in repeatedly fluctuates in a short time to cause the comparison voltage V out of the comparator U 1 to jump back and forth is effectively avoided, the protection state cannot be repeatedly entered, and the problem that the existing protection circuit in the related art easily causes frequent entering of the protection state is solved.
In this embodiment, a micro inverter is provided, which includes the voltage hysteresis protection circuit described in the above embodiment, and when the sampling voltage repeatedly fluctuates around the reference voltage, the micro inverter can not repeatedly enter a protection state, so that the micro inverter is frequently turned off and turned on, thereby causing a problem of overall failure of the inverter system.
In this embodiment, a photovoltaic module is provided, which includes a photovoltaic panel, and the micro-inverter in the above embodiment.
The photovoltaic cell panel is used for absorbing sunlight, and directly or indirectly converting solar radiation energy into electric energy through a photoelectric effect or a photochemical effect to output.
Because the output direct current can not be directly used for household electricity, in order to realize the conversion of direct current and alternating current, each photovoltaic module can be independently provided with a micro inverter with an alternating current-direct current conversion function and a maximum power point tracking function, and the electric energy generated by the photovoltaic module is directly converted into alternating current electric energy for an alternating current load to use or be transmitted to a power grid.
Through the photovoltaic module provided in this embodiment, the micro inverter can not repeatedly enter the protection state, so frequent turn-off and turn-on can not occur, the overall failure condition of the inverter system is reduced, and the overall power generation efficiency of the photovoltaic module can be improved.
It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to be limiting. 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 in accordance with the embodiments provided herein.
It is to be understood that the drawings are merely illustrative of some embodiments of the present application and that it is possible for those skilled in the art to adapt the present application to other similar situations without the need for inventive work. In addition, it should be appreciated that while the development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as a departure from the disclosure.
The term "embodiment" in this disclosure means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive. It will be clear or implicitly understood by those of ordinary skill in the art that the embodiments described in the present application can be combined with other embodiments without conflict.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the patent claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.
Claims (10)
1. A voltage hysteresis protection circuit, comprising: the non-inverting input end of the comparator is connected with the voltage dividing circuit, and the inverting input end of the comparator is connected with the sampling voltage;
The voltage dividing circuit comprises a first resistor and a second resistor which are connected in series;
and a hysteresis circuit is connected between the positive input end and the output end of the comparator, the hysteresis circuit comprises a diode and a third resistor, and the positive electrode of the diode is close to the positive input end of the comparator.
2. The voltage hysteresis protection circuit according to claim 1, wherein the voltage dividing circuit is connected to a power supply voltage for dividing the power supply voltage.
3. The voltage hysteresis protection circuit according to claim 2, wherein the first resistor and the second resistor divide the power supply voltage to obtain a first reference voltage;
When the circuit is in a normal state, the sampling voltage is lower than the first reference voltage, the comparator outputs a high level, and the diode is not conducted;
And when the circuit is in a fault state, the sampling voltage is higher than the first reference voltage, the comparator outputs a low level, the diode is conducted, the first resistor, the second resistor and the third resistor divide the power supply voltage to obtain a second reference voltage, and the second reference voltage is lower than the first reference voltage.
4. The voltage hysteresis protection circuit according to claim 3, wherein the output of the comparator remains low when the sampled voltage is restored below the first reference voltage.
5. The voltage hysteresis protection circuit according to claim 3, wherein the comparator outputs a high level when the sampling voltage is restored to be lower than the second reference voltage.
6. A voltage hysteresis protection circuit according to claim 3 wherein said third resistor is used to regulate said second reference voltage.
7. The voltage hysteresis protection circuit of claim 3, wherein the first reference voltage and the second reference voltage differ by 1V.
8. The voltage-hysteresis protection circuit according to claim 1, wherein a resistance value of the second resistor is greater than or equal to a resistance value of the third resistor.
9. A micro-inverter comprising a voltage hysteresis protection circuit according to any one of claims 1-8.
10. A photovoltaic module comprising a photovoltaic panel and the micro-inverter of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322580322.5U CN220874218U (en) | 2023-09-21 | 2023-09-21 | Voltage hysteresis protection circuit, micro inverter and photovoltaic module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322580322.5U CN220874218U (en) | 2023-09-21 | 2023-09-21 | Voltage hysteresis protection circuit, micro inverter and photovoltaic module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220874218U true CN220874218U (en) | 2024-04-30 |
Family
ID=90819351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322580322.5U Active CN220874218U (en) | 2023-09-21 | 2023-09-21 | Voltage hysteresis protection circuit, micro inverter and photovoltaic module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220874218U (en) |
-
2023
- 2023-09-21 CN CN202322580322.5U patent/CN220874218U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10505437B2 (en) | Power converting device and ground impedance value detecting method | |
| CN109167390B (en) | Photovoltaic power generation inverter system | |
| EP4053574A1 (en) | Short-circuit detection method and apparatus for inverter, and inverter | |
| EP3089344B1 (en) | Power conversion device | |
| CN107346895B (en) | Photovoltaic module and photovoltaic system including the same | |
| EP3297117A1 (en) | Distributed power system, dc-dc converter, and power conditioner | |
| CN108879672B (en) | Micro-grid three-phase thyristor fast switch and control method | |
| US20230107559A1 (en) | High voltage battery cluster, and overcurrent protection circuit and switch box thereof | |
| US20240088785A1 (en) | Resonant switched capacitor converter and control method thereof | |
| CN110429644B (en) | Inverter and power supply system | |
| CN220874218U (en) | Voltage hysteresis protection circuit, micro inverter and photovoltaic module | |
| WO2024067105A1 (en) | Power control method, power converter and power supply system | |
| US8743521B2 (en) | Photovoltaic system with overvoltage protection | |
| US11784494B2 (en) | Direct current power supply system, photovoltaic system, energy storage system, and optical storage system | |
| CN220874219U (en) | Signal latch protection circuit, micro inverter and photovoltaic module | |
| CN111987705A (en) | Direct current energy consumption system, electric power system and energy consumption method | |
| US11217993B2 (en) | Conversion system with high voltage side and low voltage side | |
| CN212676883U (en) | Overcurrent protection and delay recovery circuit and power supply equipment | |
| CN114884122A (en) | Charging control method, device and equipment | |
| CN103472354A (en) | Switching-closing judging circuit of electric leakage reclosure breaker | |
| CN108803770B (en) | Solar power supply device and equipment with optimized input and output power control | |
| WO2020146999A1 (en) | Pv power converter and control method and pv power plant using the same | |
| US20190006851A1 (en) | Split-type power optimization module for solar module strings of a solar panel | |
| CN117175760B (en) | Spacecraft electrostatic discharge energy self-collection device and electrostatic collection equipment | |
| CN220381952U (en) | Active heat dissipation device of low-voltage circuit breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |