CN211701857U - Boost circuit and device and system thereof - Google Patents
Boost circuit and device and system thereof Download PDFInfo
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- CN211701857U CN211701857U CN202020250036.6U CN202020250036U CN211701857U CN 211701857 U CN211701857 U CN 211701857U CN 202020250036 U CN202020250036 U CN 202020250036U CN 211701857 U CN211701857 U CN 211701857U
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Abstract
The utility model discloses a boost circuit and device and system thereof, boost circuit's fourth branch road is including the first TVS pipe and the third switch that concatenate, the first output of the negative pole connecting circuit of first TVS pipe, the positive pole of second diode is connected to its positive pole, the third switch is used for controlling by the positive pole of first TVS pipe to the one-way conduction between the positive pole of second diode, thereby can make the reverse of first TVS pipe switch on under the low input voltage condition, and through the positive pole clamper of the third switch that switches on with the second diode, make the pressurized value control at its both ends in reasonable within range, prevent that it from being punctured, be particularly useful for being applied to the sight of intelligence collection flow box product with boost circuit. And the third switch which is not conducted when the circuit normally works is beneficial to protecting the first TVS tube, and the fourth branch does not influence the normal work of the circuit.
Description
Technical Field
The utility model relates to a circuit technical field that steps up, more specifically say, relate to a boost circuit and device and system thereof.
Background
The input voltage of a photovoltaic power generation system is gradually increased to 1500V, and in order to increase the power generation capacity of the system, a flying capacitor type booster circuit as shown in fig. 1 is generally adopted as a preceding stage booster circuit in consideration of cost and other factors. When the circuit is applied to the field of photovoltaic power generation and forms a distributed photovoltaic power generation system, there may be a case where a bus voltage is established because other parallel boost circuits have been powered up. In this case, when the photovoltaic module PV in fig. 1 is not connected to the input terminal of the voltage boost circuit or the voltage of the photovoltaic module PV is low, that is, in the case of low input voltage, the input voltage is lower than the starting voltage of the voltage boost circuit, the bus voltage will act against the voltage boost circuit, so that the second diode D2 basically bears the entire bus voltage, and the bus voltage is easily damaged, thereby causing a problem of difficult type selection or high cost.
The prior art generally adopts a half bus clamping method to solve the above problems, however, when the boost circuit is applied to an intelligent combiner box product, the bus capacitor bank at the output end of the boost circuit does not have a midpoint, so the above technical scheme cannot be applied.
To intelligent collection flow box product, how to provide an effectual solution to protect the second diode under the low input voltage condition, do not influence the energy utilization ratio of circuit normal during operation, and then make things convenient for the device to select the type, the problem that the present case will be solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve above-mentioned technical problem, provide a boost circuit and device and system thereof, it can solve the easy problem that punctures of second diode under the low input voltage condition, and does not influence the energy utilization of the normal during operation of circuit.
To achieve the above object, a first aspect of the present invention provides a voltage boost circuit, which has a first input terminal, a second input terminal, a first output terminal, a second output terminal, a first branch, a second branch, a third branch and a fourth branch;
the first branch circuit comprises an inductor, a first diode and a second diode which are sequentially connected in series, wherein the inductor is connected with the anode of the first diode, and the first diode and the second diode are connected in series in the forward direction; the second branch circuit comprises a first controllable switch and a second controllable switch which are connected in series; the third branch comprises a first capacitor; the fourth branch comprises a first TVS tube and a third switch connected in series with the first TVS tube;
one end of the inductor is connected with a first input end, and the cathode of the second diode is connected with the first output end; one end of the second branch circuit is connected with a common point of the inductor and the first diode, and the other end of the second branch circuit is connected with a second input end and a second output end; the common point of the first controllable switch and the second controllable switch is connected to the common point of the first diode and the second diode through a third branch;
the cathode of the first TVS tube is connected with the first output end, and the anode of the first TVS tube is connected with the anode of the second diode; the third switch is used for controlling unidirectional conduction from the anode of the first TVS tube to the anode of the second diode.
In one embodiment: the third switch is a third diode, the anode of the third diode is connected with the anode of the first TVS tube, and the cathode of the third diode is connected with the anode of the second diode.
In one embodiment: the third switch is a third controllable switch, and two ends of the third controllable switch are respectively connected with the anodes of the first TVS tube and the second diode and are used for being disconnected when the circuit works normally.
In one embodiment: the third controllable switch is a normally closed relay.
In one embodiment: the first resistor is connected to a common point of the first TVS tube and the third switch on the fourth branch, and the second resistor is connected to the second output end.
In order to achieve the above object, a second aspect of the present invention provides a voltage boost circuit, which has a first input terminal, a second input terminal, a first output terminal, a second output terminal, a first branch, a second branch, a third branch and a fourth branch;
the first branch circuit comprises an inductor, a first diode and a second diode which are sequentially connected in series, wherein the inductor is connected with the anode of the first diode, and the first diode and the second diode are connected in series in the forward direction; the second branch circuit comprises a first controllable switch and a second controllable switch which are connected in series; the third branch comprises a first capacitor; the fourth branch comprises a second TVS tube;
one end of the inductor is connected with a first input end, and the cathode of the second diode is connected with the first output end; one end of the second branch circuit is connected with a common point of the inductor and the first diode, and the other end of the second branch circuit is connected with a second input end and a second output end; the common point of the first controllable switch and the second controllable switch is connected to the common point of the first diode and the second diode through a third branch;
the second TVS tube is a bidirectional TVS tube, and two ends of the second TVS tube are respectively connected with the first output end and the anode of the second diode.
In one embodiment: the two ends of the first resistor are respectively connected with the second TVS tube and the second output end.
In order to achieve the above object, a third aspect of the present invention provides an inverter device, which includes a rear inverter circuit and a front stage circuit; the front stage circuit adopts a booster circuit provided by any one of the technical schemes;
the boosting circuit is used for boosting the voltage input by the input end of the boosting circuit and then outputting the boosted voltage from the output end;
the input end of the inverter circuit is coupled with the output end of the booster circuit and used for inverting the direct current output by the inverter circuit into alternating current.
In order to achieve the above object, a fourth aspect of the present invention provides a photovoltaic power generation apparatus, which includes a photovoltaic module, a preceding stage circuit, and a subsequent stage circuit; the front stage circuit adopts a booster circuit provided by any one of the technical schemes;
the photovoltaic modules correspond to the booster circuits one by one and are coupled with the input ends of the booster circuits; the boosting circuit is used for boosting the output voltage of the photovoltaic module and then outputting the boosted output voltage to the post-stage circuit through the output end of the boosting circuit.
In order to achieve the above object, a fifth aspect of the present invention provides a photovoltaic power generation system, characterized in that: the photovoltaic power generation device comprises at least two photovoltaic power generation devices provided by the technical scheme; the output ends of the front-stage circuits of the photovoltaic power generation devices are connected in parallel and then connected to the rear-stage circuit.
Compared with the prior art, the beneficial effects of the utility model reside in that:
(1) the fourth branch of the booster circuit provided by the embodiment of the utility model comprises a first TVS tube and a third switch which are connected in series, the third switch can adopt a diode or a relay, so that the first TVS tube is reversely conducted under the condition of low input voltage, and the anode of the second diode is clamped through the conducted third switch, so that the pressed values at the two ends of the second diode are controlled within a reasonable range, and the second TVS tube is prevented from being broken down; when the circuit normally works, as the third switch is not conducted, and the anode of the first TVS tube does not establish a current loop, no current passes, so that no current passes through the fourth branch when the circuit normally works, the normal work of the circuit cannot be influenced, the energy of the input end cannot be consumed, and the voltage booster circuit is particularly suitable for the situation that the voltage booster circuit is applied to an intelligent combiner box product;
(2) the boost circuit provided by the embodiment of the utility model has the advantages that because the impact current born by the TVS tube during the forward working is lower, the disconnected third switch also has the function of protecting the first TVS tube when the circuit is powered on, so that the first TVS tube cannot work forward and bear larger impact current when the circuit is powered on;
(3) the voltage boost circuit provided by the embodiment of the utility model also comprises a first resistor which is used for establishing a current loop for the TVS tube when the circuit works normally, so that the voltage of the TVS tube in the state is more stable; in addition, because the resistance value of the first resistor is large, when the circuit works normally, the current passing through the TVS tube and the first resistor is small, the consumed energy of the input end is also small, and the normal work of the circuit is not influenced basically.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a structural diagram of a conventional flying capacitor type booster circuit;
fig. 2 is a structure diagram of a booster circuit according to embodiment 1 of the present invention;
fig. 3 is a structure diagram of a booster circuit according to embodiment 2 of the present invention;
fig. 4 is a structure diagram of a booster circuit according to embodiment 3 of the present invention;
fig. 5 is a structure diagram of a booster circuit according to embodiment 4 of the present invention;
fig. 6 is a structure diagram of a booster circuit according to embodiment 5 of the present invention;
fig. 7 is a structure diagram of a booster circuit according to embodiment 6 of the present invention;
fig. 8 is a schematic diagram of the current flow of the boost circuit according to embodiment 4 of the present invention during normal operation;
fig. 9 is a schematic structural view of an inverter according to embodiment 7 of the present invention;
fig. 10 is a schematic structural view of a photovoltaic power generation apparatus according to embodiment 8 of the present invention;
fig. 11 is a schematic structural diagram of a photovoltaic power generation system according to embodiment 9 of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are preferred embodiments of the invention and should not be considered as excluding other embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.
In the claims, the specification and the drawings, unless otherwise expressly limited, the terms "first," "second," or "third," etc. are used for distinguishing between different elements and not for describing a particular sequence. In the claims, the specification and the drawings, the terms "including", "comprising" and variations thereof, if used, are intended to be inclusive and not limiting. In the claims, the description and the drawings of the present invention, unless otherwise specified, the term "connected" encompasses both direct and indirect electrical connections.
Example 1
Referring to fig. 2, embodiment 1 of the present invention provides a voltage boost circuit having an input terminal and an output terminal. The input end comprises a first input end and a second input end, and the output end comprises a first output end and a second output end.
Generally, the boost circuit of the present embodiment can be used in various applications, and thus, the input terminal thereof can be coupled to various power input devices to receive power input therefrom. The utility model discloses an in each embodiment, all use the application scene in photovoltaic power generation field to introduce as the example, therefore boost circuit's input coupling photovoltaic module PV, it inputs boost circuit behind the direct current electric energy with light energy conversion, through stepping up it in order to carry out effective utilization to light energy. The positive pole of photovoltaic module PV connects first input, its negative pole connects the second input. In other embodiments, it is also feasible to change the input relationship between the positive electrode and the negative electrode of the photovoltaic module and the boost circuit.
Furthermore, the utility model discloses to intelligence collection flow box product, therefore the output capacitance group that is equipped with between its first output and the second output only contains an output electric capacity C2. It is worth explaining, when the boost circuit of the embodiment of the present invention is applied to the field of photovoltaic power generation, the output end is generally referred to as a bus, and the output capacitor is referred to as a bus capacitor.
It should be understood that the present invention is not limited to the application scenario in the field of photovoltaic power generation, and therefore, the coupling form of the input end and the output end is not limited to the form of each specific embodiment herein.
In a specific structure of embodiment 1, the booster circuit further includes the following devices: the circuit comprises an inductor L1, a first controllable switch Q1, a second controllable switch Q2, a first capacitor C1, a first diode D1, a second diode D2, a first TVS tube TVS1 and a third diode D3 which are correspondingly connected to form a first branch, a second branch, a third branch and a fourth branch.
The inductor L1, the first diode D1 and the second diode D2 are connected in series in sequence to form a first branch circuit.
The first controllable switch Q1 and the second controllable switch Q2 are connected in series to form a second branch circuit. In the present embodiment, the first controllable switch Q1 and the second controllable switch Q2 are usually transistors, such as field effect transistors or IGBTs. When a field effect transistor is adopted, the source electrode of the first controllable switch Q1 is connected with the drain electrode of the second controllable switch Q2; when an IGBT is used, the emitter of the first controllable switch Q1 is connected to the collector of the second controllable switch Q2.
In addition, the first capacitor C1 forms a third branch, and the first TVS transistor and the third diode D3 are connected in series to form a fourth branch.
The following describes a specific connection relationship of each branch in the booster circuit of embodiment 1:
one end of the inductor L1 is connected to the first input terminal, and the cathode of the second diode D2 is connected to the first output terminal. One end of the second branch (collector of the first controllable switch Q1) is connected to the common point of the inductor L1 and the first diode D1, and the other end (emitter of the second controllable switch Q2) is connected to the second input terminal and the second output terminal. The common point of the first controllable switch Q1 and the second controllable switch Q2 is connected to the common point (point C in the figure) of the first diode D1 and the second diode D2 via a third branch (first capacitor C1). The cathode of the first TVS transistor TVS1 is connected to the first output terminal, and the anode thereof is connected to the anode of the second diode D2. The anode of the third diode is connected with the anode of the first TVS tube, and the cathode of the third diode is connected with the anode of the second diode.
After the above connection is performed to form the boost circuit of the present embodiment, each branch mainly achieves the following functions.
In the first branch, the inductor L1 is used to cycle between storing electric energy and releasing electric energy during the working period, so as to boost the voltage at the input terminal and output the boosted voltage to the output terminal. In addition, two ends of the first branch circuit point to the input end and the output end respectively, and a common point of two diodes in the first branch circuit is connected with the third branch circuit with a capacitance device, so that the unidirectional conduction characteristic of current is formed between corresponding devices, and the electric energy is prevented from reversely flowing back to the input end to cause electric energy loss.
And the second branch circuit comprising a controllable switch is used for controlling the on-off of each loop in the boosting circuit during normal operation, so that the inductor L1 and a first capacitor C1 which is described below are correspondingly in the states of storing electric energy and releasing electric energy, and the boosting process is completed. In this embodiment, the first controllable switch Q1 and the second controllable switch Q2 are various triodes, so as to control the on/off of the triodes quickly and conveniently by electronic signals.
The first capacitor C1 in the third branch is used as a flying capacitor for storing and releasing electric energy during normal operation, and also plays a role in boosting the input voltage. In normal operation, the voltage of the first capacitor C1 is substantially kept near half the bus voltage due to its selection of capacitance, but still fluctuates due to the charging and discharging processes.
The first TVS transistor TVS1 in the fourth branch is used to provide a clamping voltage for the second diode D2 to prevent it from breaking down under the condition of the low input voltage, and its operation principle will be described in detail below. The third diode D3 functions as a third switch for controlling the unidirectional conduction from the anode of the first TVS transistor TVS1 to the anode of the second diode D2, thereby protecting the first TVS transistor TVS1 when the circuit is powered on and preventing the fourth branch from affecting the normal operation of the circuit.
Because the utility model discloses a boost circuit is at normal during operation, and its specific working process and the principle that steps up to input voltage have been for technical staff's in the field of common general knowledge, the utility model discloses just no longer describe repeatedly. The following describes in detail how to prevent the second diode D2 from breaking down in the low input voltage condition and to keep the energy conversion rate of the boost circuit at a high level during normal operation.
In the case of the low input voltage, since the cathode of the first TVS1 is connected to the first output terminal and the anode is connected to the anode of the second diode D2 through the third diode D3, when the clamping voltage parameter of the first TVS1 is selected to be a proper value, it can be operated in reverse and generate a certain voltage drop, so as to provide a stable clamping voltage at the anode terminal thereof, and clamp the voltage of the anode of the second diode D2 through the third diode D3, so that the voltage borne by the two terminals of the second diode D2 is lower than the selected withstand voltage value, and the second diode D2 can still be guaranteed not to be broken down at normal cost, thereby facilitating the low-cost selection thereof. In addition, the TVS tube can bear larger impact current when working reversely, so that the stability is better.
In this embodiment, when the bus voltage reaches 1500V, the clamping voltage of the TVS1 of the first TVS transistor may be 1000V, and under the condition of the low input voltage, the voltage at point a is the difference between the bus voltage and the clamping voltage of the TVS1 of the first TVS transistor, i.e. 500V; the voltage of the point A is loaded to the point C through the third diode D3, so that the anode voltage of the second diode D2 is 500V, and the cathode voltage of the second diode D2 is 1500V of the bus voltage, therefore, the voltage required to be borne by the second diode D2 is 1000V, and only the diode with the withstand voltage value of about 1200V needs to be selected, so that the cost requirement of type selection is met.
It should be noted that, since the surge current that can be borne by the TVS transistor during the forward operation is low, the third diode D3 also has the function of protecting the TVS1 of the first TVS transistor during the circuit power-on, otherwise, a large current generated during the circuit power-on will be transmitted from the point C to the point a on the fourth branch, and the large current will easily cause the TVS1 of the first TVS transistor to be damaged during the forward operation.
Since the voltage across the first capacitor C1 is typically maintained to fluctuate near the half bus voltage during normal operation of the circuit, the voltage at point C typically fluctuates from half bus voltage to bus voltage, and when the clamping voltage parameter of the first TVS transistor TVS1 is typically selected to be higher than half the bus voltage, the voltage at point C will not substantially fall below the voltage at point a throughout the normal operation cycle of the circuit. Therefore, the conduction of the fourth branch from the point C to the point a is cut off by the third diode D3, so that the first TVS tube TVS1 may be reversely conducted, but no current passes through since the anode thereof does not establish a current loop, which means that no current passes through the fourth branch during the normal operation of the circuit, and the normal operation of the circuit is not affected, and the energy of the input terminal is not consumed.
In summary, in the present embodiment, the fourth branch is constructed by using the first TVS transistor TVS1 and the third diode D3, so that the fourth branch can provide a clamping voltage for the second diode D2 under the condition of the low input voltage, the problem that the second diode is easily broken down can be effectively solved, the normal operation of the circuit is not affected basically, and the voltage boost circuit is particularly suitable for the situation where the voltage boost circuit is applied to the intelligent combiner box product.
Example 2
Referring to fig. 3, embodiment 2 is a modified embodiment of embodiment 1, and is different from embodiment 1 in that a third diode D3 on a fourth branch is replaced by a third controllable switch K1, and two ends of the third controllable switch are respectively connected to anodes of the first TVS transistor and the second diode. It goes without saying that the function of the third diode D3 is the same as that of the third diode D3, i.e. it is used as a third switch to control the unidirectional conduction from the anode of the first TVS tube TVS1 to the anode of the second diode D2, so as to protect the first TVS tube TVS1 when the circuit is powered on, and to prevent the fourth branch from affecting the normal operation of the circuit.
Naturally, the circuit should also comprise a controller for controlling the third controllable switch K1 to be open during normal operation of the circuit and for controlling the third controllable switch K1 to be closed in case of said low input voltage. Preferably, the third controllable switch K1 is a normally closed relay, so that it is only necessary to control its opening during normal operation.
Since the third controllable switch K1 is turned on or off correspondingly, and the function of the third diode in the circuit is the same as that of the third diode in embodiment 1, the working principle of embodiment 2 is basically the same as that of embodiment 1, and thus, the description thereof is omitted.
Example 3
Referring to fig. 4, embodiment 3 is also a modified embodiment of embodiment 1. In embodiment 3, the second TVS transistor TVS2 configured as a bidirectional TVS transistor is directly used to replace the unidirectional TVS transistor in embodiment 1, and since it is equivalent to two unidirectional TVS transistors connected in series and the unidirectional TVS transistor can be equivalent to a common diode when working in the forward direction, the working principle of embodiment 3 is basically the same as that of embodiment 1, and the details thereof are not repeated herein.
Example 4
Referring to fig. 5 and 8, the circuit of embodiment 4 is improved on the basis of embodiment 1, and the circuit further includes a first resistor R1, one end of which is connected to the common point of the first TVS transistor and the third diode D3 in the fourth branch, and the other end of which is connected to the second output terminal.
In embodiment 1, it is mentioned that, since the conduction from the point C to the point a of the fourth branch circuit is cut off by the third diode D3, although the first TVS tube TVS1 may be reversely conducted, no current will pass through since the anode thereof cannot establish a current loop, which will not affect the normal operation of the circuit and will not consume the energy at the input end, but the voltage across the TVS tube will not be stable because no current passes continuously. Thus, the first resistor R1 introduced in embodiment 4 has the function of establishing a current loop for the first TVS transistor TVS 1.
As shown in fig. 8, in the normal operation of the circuit of the embodiment 4, when the bus voltage is higher than the clamping voltage parameter of the first TVS transistor TVS1, the first TVS transistor TVS1 is turned on reversely, and since the third diode D3 is turned off, the current will flow through the first resistor R1, so that the voltage of the first TVS transistor TVS1 in this state is stable.
It should be noted that, since the resistance of the first resistor R1 is usually selected to have a resistance of megaohms, when the circuit is operating normally, the current passing through the first TVS transistor TVS1 and the first resistor R1 is small, and the consumed energy at the input end is also small, which does not substantially affect the normal operation of the circuit.
Examples 5 to 6
Reference is made to fig. 6 and 7, which correspond to example 5 and example 6, respectively. Embodiments 5 and 6 are improved based on embodiments 2 and 3, respectively, and specifically, in embodiment 5, the circuit further includes a first resistor R1, one end of which is connected to the common point of the first TVS transistor and the third controllable switch K1 in the fourth branch, and the other end of which is connected to the second output terminal; in embodiment 6, the circuit further includes a first resistor R1, two ends of which are respectively connected to the second TVS transistor TVS2 and the second output terminal.
It should be understood that the modified portions of the embodiments 5 and 6 are the same as the modified portions of the embodiment 4 with respect to the embodiment 1, and the functions and principles thereof are also completely the same, that is, the circuit is established to play a role in stabilizing the voltage of the TVS tube during normal operation, and the details thereof are not repeated herein.
Examples 7 to 9
Specific applications of the boosting circuit are described below through embodiments 7 to 9, but the specific application scenarios are not limited to these embodiments.
Referring to fig. 9, embodiment 7 of the present invention provides an inverter device, which includes a preceding stage circuit and a subsequent stage inverter circuit. The preceding stage circuit adopts the booster circuit of the technical scheme.
The boost circuit is used for boosting the voltage input by the input end of the boost circuit and then outputting the boosted voltage from the output end, and the input end of the inverter circuit is coupled with the output end of the boost circuit and used for inverting the direct current output by the inverter circuit into alternating current.
Referring to fig. 10, embodiment 8 of the present invention provides a photovoltaic power generation apparatus, which includes a photovoltaic module PV, a front-stage circuit, and a rear-stage circuit; the preceding stage circuit adopts the booster circuit according to the technical scheme.
The photovoltaic modules PV correspond to the booster circuits one by one and are coupled with the input ends of the booster circuits; the boosting circuit is used for boosting the output voltage of the photovoltaic module PV and then outputting the boosted output voltage to the post-stage circuit through the output end of the boosting circuit.
Referring to fig. 11, embodiment 9 of the present invention provides a photovoltaic power generation system, including at least two photovoltaic power generation apparatuses as provided in embodiment 4; the output ends of the front stage circuits of the photovoltaic power generation devices are connected in parallel and then connected to the rear stage circuit, so that the distributed photovoltaic power generation system is formed.
The apparatus and system of embodiments 7-9, which employ the booster circuit of the previous embodiment, inherit all the advantages of the booster circuit.
The description of the above specification and examples is intended to illustrate the scope of the invention, but should not be construed as limiting the scope of the invention. Modifications, equivalents and other improvements which may be made to the embodiments of the invention or to some of the technical features thereof by a person of ordinary skill in the art through logical analysis, reasoning or limited experimentation in light of the above teachings of the invention or the above embodiments are intended to be included within the scope of the invention.
Claims (10)
1. A voltage boost circuit, characterized by: the circuit comprises a first input end, a second input end, a first output end, a second output end, a first branch circuit, a second branch circuit, a third branch circuit and a fourth branch circuit;
the first branch circuit comprises an inductor, a first diode and a second diode which are sequentially connected in series, wherein the inductor is connected with the anode of the first diode, and the first diode and the second diode are connected in series in the forward direction; the second branch circuit comprises a first controllable switch and a second controllable switch which are connected in series; the third branch comprises a first capacitor; the fourth branch comprises a first TVS tube and a third switch connected in series with the first TVS tube;
one end of the inductor is connected with a first input end, and the cathode of the second diode is connected with the first output end; one end of the second branch circuit is connected with a common point of the inductor and the first diode, and the other end of the second branch circuit is connected with a second input end and a second output end; the common point of the first controllable switch and the second controllable switch is connected to the common point of the first diode and the second diode through a third branch;
the cathode of the first TVS tube is connected with the first output end, and the anode of the first TVS tube is connected with the anode of the second diode; the third switch is used for controlling unidirectional conduction from the anode of the first TVS tube to the anode of the second diode.
2. The booster circuit of claim 1, wherein: the third switch is a third diode, the anode of the third diode is connected with the anode of the first TVS tube, and the cathode of the third diode is connected with the anode of the second diode.
3. The booster circuit of claim 2, wherein: the third switch is a third controllable switch, and two ends of the third controllable switch are respectively connected with the anodes of the first TVS tube and the second diode and are used for being disconnected when the circuit works normally.
4. A boost circuit according to claim 3, wherein: the third controllable switch is a normally closed relay.
5. The booster circuit of any one of claims 1-4, wherein: the first resistor is connected to a common point of the first TVS tube and the third switch on the fourth branch, and the second resistor is connected to the second output end.
6. A voltage boost circuit, characterized by: the circuit comprises a first input end, a second input end, a first output end, a second output end, a first branch circuit, a second branch circuit, a third branch circuit and a fourth branch circuit;
the first branch circuit comprises an inductor, a first diode and a second diode which are sequentially connected in series, wherein the inductor is connected with the anode of the first diode, and the first diode and the second diode are connected in series in the forward direction; the second branch circuit comprises a first controllable switch and a second controllable switch which are connected in series; the third branch comprises a first capacitor; the fourth branch comprises a second TVS tube;
one end of the inductor is connected with a first input end, and the cathode of the second diode is connected with the first output end; one end of the second branch circuit is connected with a common point of the inductor and the first diode, and the other end of the second branch circuit is connected with a second input end and a second output end; the common point of the first controllable switch and the second controllable switch is connected to the common point of the first diode and the second diode through a third branch;
the second TVS tube is a bidirectional TVS tube, and two ends of the second TVS tube are respectively connected with the first output end and the anode of the second diode.
7. The booster circuit of claim 6, wherein: the two ends of the first resistor are respectively connected with the second TVS tube and the second output end.
8. An inverter device, characterized in that: the inverter comprises a rear-stage inverter circuit and a front-stage circuit; the front stage circuit adopts the booster circuit of any one of claims 1 to 7;
the booster circuit is used for boosting the voltage input by the input end of the booster circuit and then outputting the boosted voltage from the output end of the booster circuit;
the input end of the inverter circuit is coupled with the output end of the booster circuit and used for inverting the direct current output by the inverter circuit into alternating current.
9. A photovoltaic power generation device characterized in that: the photovoltaic module comprises a photovoltaic module, a front-stage circuit and a rear-stage circuit; the front stage circuit adopts the booster circuit of any one of claims 1 to 7;
the photovoltaic modules correspond to the booster circuits one by one and are coupled with the input ends of the booster circuits; the boosting circuit is used for boosting the output voltage of the photovoltaic module and then outputting the boosted output voltage to the post-stage circuit through the output end of the boosting circuit.
10. A photovoltaic power generation system, characterized in that: comprising at least two photovoltaic power generation devices according to claim 9; the output ends of the front-stage circuits of the photovoltaic power generation devices are connected in parallel and then connected to the rear-stage circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020250036.6U CN211701857U (en) | 2020-03-04 | 2020-03-04 | Boost circuit and device and system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020250036.6U CN211701857U (en) | 2020-03-04 | 2020-03-04 | Boost circuit and device and system thereof |
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Address after: 361000 Ma Long Road 457, Torch Garden, Xiamen Torch High-tech Zone, Xiamen City, Fujian Province Patentee after: Kehua Data Co.,Ltd. Patentee after: ZHANGZHOU KEHUA TECHNOLOGY Co.,Ltd. Address before: 361000 Ma Long Road 457, Torch Garden, Xiamen Torch High-tech Zone, Xiamen City, Fujian Province Patentee before: XIAMEN KEHUAHENGSHENG LIMITED BY SHARE Ltd. Patentee before: ZHANGZHOU KEHUA TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20220627 Address after: 361001 room 208-38, Hengye building, No. 100, Xiangxing Road, Xiamen Torch High tech Zone (Xiang'an) Industrial Zone, Xiamen, Fujian Patentee after: Xiamen Kehua shuneng Technology Co.,Ltd. Address before: 361000 Ma Long Road 457, Torch Garden, Xiamen Torch High-tech Zone, Xiamen City, Fujian Province Patentee before: Kehua Data Co.,Ltd. Patentee before: ZHANGZHOU KEHUA TECHNOLOGY Co.,Ltd. |