CN219739994U - Power supply shutoff circuit and power supply circuit - Google Patents

Abstract

The utility model discloses a power supply turn-off circuit and a power supply circuit, wherein the power supply turn-off circuit is applied to the power supply circuit, the power supply circuit comprises a power supply side and a load side, and the power supply side and the load side are connected through a positive line and a negative line to form a power supply loop; the power supply shutoff circuit comprises a first switch piece, a driving unit, a first capacitor and a discharge unit, wherein the driving unit is used for controlling the on-off of the first switch piece, so that the on-off between a power supply side and a load side can be controlled; the first capacitor is coupled to the first end and the second end of the first switch piece, and the discharge unit is coupled to the two ends of the first capacitor, so that the first capacitor can be discharged when the driving unit outputs a driving signal; that is, after the driving unit outputs the driving signal, the first switch element is turned off, and at this time, the first capacitor is discharged, so that the turn-off rate of the first switch element is improved, so as to improve the turn-off response rate of the power supply turn-off circuit.

Description

Power supply shutoff circuit and power supply circuit

Technical Field

The utility model relates to the technical field of circuit breakers, in particular to a power supply shutoff circuit and a power supply circuit.

Background

Photovoltaic panels are a type of power generation device that can convert solar energy into electrical energy.

In the related art, a photovoltaic panel is used as a power supply side to supply power to a load side, a power supply turn-off circuit is arranged between the power supply side and the load side, and a turn-off device is arranged in the power supply turn-off circuit and used for controlling on-off between the power supply side and the load side. However, the slow response speed of the current turn-off device results in a low turn-off rate, and it is difficult to achieve a fast turn-off between the power supply side and the load side.

Disclosure of Invention

The utility model aims to provide a power supply turn-off circuit and a power supply circuit so as to solve the problem of low turn-off rate in the current power supply turn-off circuit.

The utility model adopts the following scheme for solving the technical problems.

In a first aspect, the present utility model provides a power supply shutdown circuit, for use in a power supply circuit, the power supply circuit including a power supply side and a load side, the power supply side and the load side being connected by a positive line and a negative line to form a power supply loop, the power supply shutdown circuit comprising:

the first switch piece is arranged on the positive electrode wire; the first switch piece comprises a first end, a second end and a control end, wherein the first end is used for being connected with the power supply side, and the second end is used for being connected with the load side;

the driving unit is connected with the control end and is used for outputting the driving signal to the control end so as to control the connection and disconnection between the first end and the second end;

a first capacitor coupled between the control terminal and the second terminal;

a bleed unit coupled to both ends of the first capacitor, the bleed unit having an on-state and an off-state, and the bleed unit being configured to be in the on-state to discharge the first capacitor when the drive unit outputs a drive signal to control the first and second ends to be off.

In some embodiments of the present utility model, the vent unit includes a second switch member coupled to the first end and the second end; the second switch piece is selected from one of a relay, an optocoupler, a MOS tube, a triode and an IGBT; the first switch piece is selected from one of MOS pipe, triode and IGBT.

In some embodiments of the utility model, the driving unit includes:

the second capacitor is a charging capacitor, one end of the second capacitor is connected with the control end, and the other end of the second capacitor is connected with the second end;

the third switch piece is arranged between the second capacitor and the control end;

a fourth switching element disposed between the second capacitor and the second terminal;

wherein the second capacitor outputs the driving signal when the third switching element and the fourth switching element are closed.

In some embodiments of the present utility model, the power supply shutdown circuit further includes a charging unit including a first charging side and a second charging side; one end of the second capacitor is connected with the first charging side, and the other end of the second capacitor is connected with the second charging side; one side of the first charging side, which is away from the second capacitor, is connected with the positive electrode wire, and one side of the second charging side, which is away from the second capacitor, is connected with the negative electrode wire.

In some embodiments of the utility model, a fifth switch element is provided on the first charging side and/or the second charging side, the fifth switch element being configured to have a first state in which it is periodically conductive and a second state in which it is completely disconnected;

when the fifth switch piece is in a first state and is conducted, the second capacitor enters a charging state; when the fifth switch piece is disconnected, the second capacitor enters a discharging state and supplies power to the first capacitor so that the first switch piece is in a normally closed state;

when the fifth switch piece is in the second state, the second capacitor and the first capacitor are sequentially discharged, so that the first switch piece is in the off state.

In some embodiments of the present utility model, the power supply shutdown circuit further includes a low voltage output unit configured to connect the positive electrode line and the negative electrode line to output a low voltage signal when the first terminal and the second terminal are disconnected; the value of the low-voltage signal is smaller than that of the high-voltage signal, and the high-voltage signal is a voltage signal output from the power supply side to the load side.

In some embodiments of the present utility model, the low voltage output unit includes a first resistor, a second resistor, and a sixth switching element, the first resistor and the second resistor being disposed in series between the positive electrode line and the negative electrode line; one end of the sixth switch element is connected between the first resistor and the second resistor, and the other end of the sixth switch element is connected with one end, close to the load side, of the positive electrode line.

In some embodiments of the present utility model, the power supply shutdown circuit further includes a dummy load unit connected between the positive electrode line and the negative electrode line.

In some embodiments of the present utility model, the power supply shutdown circuit further includes:

the sampling unit is connected in series with the positive electrode line or the negative electrode line; the sampling unit is used for acquiring a power carrier signal and outputting a first sampling signal according to the power carrier signal;

the control unit is used for receiving the first sampling signal and selectively controlling the driving unit to output the driving signal according to the first sampling signal.

In a second aspect, the present utility model provides a power supply circuit for supplying power to a load side, the power supply circuit including a power supply side and the power supply shutdown circuit described above, the power supply shutdown circuit being disposed between the power supply side and the load side and being configured to control on/off of the power supply side and the load side; wherein the power supply side comprises a photovoltaic device for converting solar energy into electrical energy required by the load side.

The utility model provides a power supply turn-off circuit which is applied to a power supply circuit, wherein the power supply circuit comprises a power supply side and a load side, and the power supply side and the load side are connected through a positive line and a negative line to form a power supply loop; the power supply shutoff circuit comprises a first switch piece, a driving unit, a first capacitor and a discharge unit, wherein the driving unit is used for controlling the on-off of the first switch piece, so that the on-off between a power supply side and a load side can be controlled; the first capacitor is coupled to the first end and the second end of the first switch piece, and the discharge unit is coupled to the two ends of the first capacitor, so that the first capacitor can be discharged when the driving unit outputs a driving signal; that is, after the driving unit outputs the driving signal, the first switching element is turned off; at this time, the first capacitor is discharged; the turn-off rate of the first switch piece is improved, so that the turn-off response rate of the power supply turn-off circuit is improved.

Drawings

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

FIG. 1 is a block diagram of a power supply circuit according to an embodiment of the present utility model;

FIG. 2 is a frame structure diagram of a power supply circuit according to another embodiment of the present utility model;

FIG. 3 is a frame structure diagram of a power supply circuit according to another embodiment of the present utility model;

FIG. 4 is a circuit diagram of a power supply circuit according to an embodiment of the present utility model;

FIG. 5 is a block diagram of a power supply circuit according to another embodiment of the present utility model;

FIG. 6 is a block diagram of a power supply circuit according to still another embodiment of the present utility model;

fig. 7 is a frame structure diagram of a power supply circuit according to still another embodiment of the present utility model.

Description of main reference numerals:

100-power supply side, 200-power supply turn-off circuit, 210-first switch element, 220-first capacitor, 230-driving unit, 240-discharge unit, 250-control unit, 260-charging unit, 261-first charging side, 262-second charging side, 270-low voltage output unit, 280-dummy load unit, 300-load side, S2-second switch element, S3-third switch element, S4-fourth switch element, S5-fifth switch element, S6-sixth switch element, C2-second capacitor, C3-third capacitor, D5-fifth diode, D6-sixth diode, D7-seventh diode, D8-eighth diode, D9-ninth diode, R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, R5-fifth resistor.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model. In the description of the present utility model, the meaning of "a plurality" is two or more unless explicitly defined otherwise.

In the application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "exemplary" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for purposes of explanation. It will be understood by those of ordinary skill in the art that the present utility model may be practiced without these specific details. In other instances, well-known structures and processes have not been shown in detail to avoid unnecessarily obscuring the description of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles disclosed herein.

In the current circuit that photovoltaic board was the load power supply, be provided with the shutoff device, but present shutoff device shutoff inefficiency leads to the shutoff inefficiency between photovoltaic board and the load, has the potential safety hazard. In some technologies, the turn-off device is a MOS tube, and a capacitor is arranged between a G pole and an S pole of the MOS tube, and the capacitor can enable the MOS tube to be slowly started, so that the MOS tube is prevented from being burnt by heavy current at the moment of turn-on, that is, the MOS tube can play a role in protection when being turned on; however, the capacitor also reduces the turn-off rate of the MOS transistor; specifically, when the G pole level of the MOS tube is reduced, the capacitor discharges and pulls up the G pole potential so as to delay the off time of the MOS tube.

Therefore, the current turn-off device has a slow response speed, resulting in a low turn-off rate, and it is difficult to achieve a fast turn-off between the power supply side and the load side.

In view of this, the present utility model proposes a power supply shutdown circuit and a power supply circuit capable of solving the above-described problems.

Referring to fig. 1, fig. 1 shows a frame configuration diagram of a power supply circuit provided in the present embodiment. The present embodiment is a power supply circuit for supplying power to the load side 300. The power supply circuit includes the power supply side 100 and the power supply shutoff circuit 200 described above, and the power supply shutoff circuit 200 is provided between the power supply side 100 and the load side 300, and is used to control on/off of the power supply side 100 and the load side 300. It should be explained that the power supply side 100 is configured to supply power to the load side 300, and the power supply shutoff circuit 200 is disposed between the power supply side 100 and the load side 300 and is configured to control whether the power supply side 100 supplies power to the load side 300.

Specifically, the negative electrode line is grounded. The power side 100 includes photovoltaic devices for converting solar energy into electrical energy required by the load side 300. In some embodiments the photovoltaic device comprises a photovoltaic panel.

In some embodiments of the present utility model, referring to fig. 2, fig. 2 shows a frame structure diagram of a power supply circuit provided in the present embodiment. The power supply side 100 and the load side 300 of the present embodiment are connected by positive and negative lines to form a power supply loop. The power shut-off circuit 200 of the present embodiment includes a first switching element (210, a driving unit 230, a first capacitor 220, and a drain unit 240. It is understood that the driving unit 230 may be used to control the on/off of the first switching element 210.

Specifically, the first switching element 210 is disposed on the positive line. In another embodiment, the first switch 210 may also be disposed on the negative output line. The first switching member 210 includes a first end for connecting the power supply side 100, a second end for connecting the load side 300, and a control end for receiving a driving signal to control disconnection between the first end and the second end. It is understood that the driving signal is a signal emitted from the driving unit 230.

In some embodiments, the first switch 210 is selected from one of a MOS transistor, a triode, and an IGBT (Insulated Gate Bipolar Transistor ). In one possible example, the first switch 210 is a MOS transistor (corresponding to Q1 in fig. 4). The first end is the D pole of the MOS tube, the second end is the S pole of the MOS tube, and the control end is the G pole of the MOS tube. More specifically, the MOS transistor is an NMOS transistor.

Specifically, the driving unit 230 is connected to the control terminal and is used to output a driving signal to the control terminal to control on and off between the first terminal and the second terminal. That is, the driving unit 230 can output a driving signal to the control terminal, thereby controlling the on-off between the first terminal and the second terminal, and further controlling the on-off between the power supply side 100 and the load side 300.

Specifically, a first capacitor (corresponding to C1 in fig. 4) 220 is coupled between the control terminal and the second terminal. It can be appreciated that after the driving unit 230 sends out the driving signal, the first capacitor 220 can slowly absorb part of the driving signal until the first capacitor 220 is fully charged, which is beneficial to gradually increasing the value of the driving signal received by the control unit during the on process of the first switch 210, so as to achieve the purpose of soft start of the first switch 210, and simultaneously prevent the instant voltage from damaging the first switch 210.

Specifically, a bleed unit 240 is coupled across the first capacitor 220, the bleed unit 240 having an on-state and an off-state. It will be appreciated that when the bleed unit 240 is in the on state, the two ends of the first capacitor 220 are connected, so that rapid discharging of the first capacitor 220 can be achieved; when the vent unit 240 is in the open state, both ends of the first capacitor 220 are open, and the first capacitor 220 is not discharged to the outside. The bleed unit 240 is configured such that when the drive unit 230 outputs a drive signal to control the first and second terminals to be disconnected, the bleed unit 240 is in a conductive state to discharge the first capacitor 220. It should be explained that, when the driving unit 230 outputs the driving signal, the driving signal is a low level signal, and the first switch 210 is in a state to be turned off; in the case where the bleed unit 240 is not provided or the bleed unit 240 is not conductive, the first capacitor 220 continuously outputs a voltage signal to the control terminal to maintain the conductive state of the first switch 210 for a short period of time, and at this time, the turn-off rate of the first switch 210 is reduced. That is, when the driving unit 230 outputs the driving signal, the discharging unit 240 is controlled to be in the on state, so as to control the first capacitor 220 to rapidly discharge, thereby reducing the value and duration of the voltage signal provided by the first capacitor 220 to the control terminal, which is beneficial to promoting the first switch 210 to rapidly open, and further improving the power-off rate between the power supply side 100 and the load side 300.

In the current power supply shutdown circuit 200, only the first switch element 210 is partially arranged, and the first capacitor 220 is not arranged, so that the first switch element 210 is easily damaged by instantaneous high voltage when being turned on; if the first capacitor 220 is provided, the first switch element 210 can be protected when it is turned on, but the turn-off rate is reduced when the first switch element 210 is turned off, and thus safety risks are easily caused. However, in the present utility model, after the driving unit 230 outputs the driving signal, the first switching member 210 is turned off; at this time, by discharging the first capacitor 220, the turn-off rate of the first switch 210 is advantageously increased, so as to increase the turn-off response rate of the power supply turn-off circuit 200.

In some embodiments of the present utility model, referring to fig. 3, fig. 3 shows a frame structure diagram of a power supply circuit provided in this embodiment. The power supply shutdown circuit 200 in this embodiment includes a control unit 250 and a sampling unit, where the sampling unit is connected in series to the positive line or the negative line, and is configured to obtain a power carrier signal, and output a first sampling signal according to the power carrier signal. It is understood that the sampling unit may receive a control signal output from the load side 300 or the power supply side 100, and the control signal is transmitted in the form of a power carrier signal.

The control unit 250 is configured to receive the first sampling signal, and selectively control the driving unit 230 to output a driving signal according to the first sampling signal. That is, the control unit 250 may selectively control the first switch 210 to be turned off or on after receiving the first sampling signal.

In some embodiments, the sampling unit includes a sampling inductance connected in series on the negative line.

In some embodiments, a frequency-selective filtering unit is disposed between the sampling unit and the control unit 250, where the frequency-selective filtering unit is configured to perform a frequency-selective filtering process on the first sampling signal.

In some embodiments of the present utility model, referring to fig. 4, fig. 4 shows a circuit configuration diagram of a power supply circuit provided in this embodiment. The vent unit 240 of the present embodiment includes a second switch member S2, the second switch member S2 being coupled to the first and second ends. That is, the on/off of both ends of the capacitor is controlled by controlling the on/off of the second switching member S2. The second switch piece S2 is selected from one of a relay, an optocoupler, a MOS tube, a triode and an IGBT.

In some embodiments, control unit 250 is also used to control the on/off of bleed unit 240. In a more specific embodiment, the control unit 250 is configured to control on/off of the second switch member S2.

In some embodiments of the present utility model, please continue to refer to fig. 4, the driving unit 230 of the present embodiment includes a second capacitor C2, a third switch S3 and a fourth switch S4. The second capacitor C2 is a charging capacitor, and one end of the second capacitor C2 is connected to the control end, and the other end is connected to the second end. That is, the second capacitor C2 can output a driving signal (low level signal) to the first switch 210 (NMOS transistor) to trigger the first switch 210 to be turned off.

The third switch element S3 is arranged between the second capacitor C2 and the control end; the control circuit is used for controlling the on-off state between the second capacitor C2 and the control end. The fourth switch piece S4 is disposed between the second capacitor C2 and the second terminal; for controlling the on-off state between the second capacitor C2 and the second terminal. The second capacitor C2 outputs a driving signal when the third switching part S3 and the fourth switching part S4 are closed. That is, when the third switching part S3 and the fourth switching part S4 are closed, the second capacitor C2 outputs a driving signal to control the electric potentials of the second terminal and the control terminal so that the first switching part 210 is opened.

In some embodiments, the driving unit 230 includes a sixth diode D6 and a seventh diode D7, and the sixth diode D6 is disposed in series between the second capacitor C2 and the third switching element S3. The seventh diode D7 is connected in parallel to both ends of the second capacitor C2.

In some embodiments, the control unit 250 is used to control on/off of the third switching part S3 and the fourth switching part S4. In some embodiments, the third and fourth switching elements S3 and S4 are selected from one of a relay, an optocoupler, a MOS transistor, a triode, and an IGBT.

In some embodiments of the present utility model, please continue to refer to fig. 4 and fig. 5, fig. 5 shows a frame structure diagram of the power supply circuit in this embodiment. The power supply shutdown circuit 200 in the present embodiment further includes a charging unit 260, and the charging unit 260 includes a first charging side 261 and a second charging side 262. One end of the second capacitor C2 is connected to the first charging side 261, and the other end is connected to the second charging side 262. One side of the first charging side 261, which faces away from the second capacitor C2, is connected to a positive line, and one side of the second charging side 262, which faces away from the second capacitor C2, is connected to a negative line. That is, the second capacitor C2 can be charged through the first charging side 261 and the second charging side 262 so that the second capacitor C2 can output the driving signal.

In some embodiments, the first charging side 261 includes a third resistor R3 and a fifth diode D5, where the third resistor R3 and the fifth diode D5 are connected in series between the second capacitor C2 and the positive line.

In some embodiments of the present utility model, please continue to refer to fig. 4, a fifth switch S5 is disposed on the first charging side 261 and/or the second charging side 262, and the fifth switch S5 is configured to have a first state capable of being periodically turned on and a second state capable of being completely turned off. That is, when the fifth switch S5 is in the first state, it is in an intermittent conduction state. When the fifth switch element S5 is in the second state, the fifth switch element S5 is completely turned off. It should be explained that when the fifth switch S5 is turned on, the second capacitor C2 can be charged, and the second capacitor C2 cannot supply power to the first capacitor 220, and the first capacitor 220 can output a voltage signal to turn on the first switch 210; when the fifth switch S5 is turned off, the second capacitor C2 is not charged, but can discharge the first capacitor 220 to charge the first capacitor 220.

Specifically, when the fifth switch S5 is in the first state and the fifth switch S5 is turned on, the second capacitor C2 enters a charged state; when the fifth switch S5 is turned off, the second capacitor C2 enters a discharging state and supplies power to the first capacitor 220, so that the first switch 210 is in a normally closed state;

more specifically, when the fifth switching element S5 is in the second state, the second capacitor C2 and the first capacitor 220 are sequentially discharged to place the first switching element 210 in the off state. That is, in one period in the first state, the fifth switch S5 is closed first to fully charge the second capacitor C2; the fifth switch is opened, so that the second capacitor C2 charges the first capacitor C1, and the first capacitor C1 can output a high-level signal to trigger the first switch 210 to be closed; when the driving unit 230 is required to output the driving signal, the fifth switch S5 is controlled to be in the second state, that is, the off state, and the voltage of the second capacitor C2 and the voltage of the first capacitor C1 gradually decrease until the driving signal of the low level signal is formed, so as to trigger the first switch 210 to be turned off.

In some embodiments, a fifth switch S5 is disposed on the second charging side 262. Specifically, the control unit 250 is used to control on/off of the fifth switching element S5. In some embodiments, the fifth switch S5 is selected from one of a relay, an optocoupler, a MOS transistor, a triode, and an IGBT.

In some embodiments, the fifth switch S5 may also be turned on/off by a timer.

In some embodiments, the fifth switch S5 is intermittently turned on and off to charge the second capacitor C2. And when the second capacitor C2 is charged, the third switching element S3 and the fourth switching element S4 need to be turned off.

In some embodiments of the present utility model, referring to fig. 6, fig. 6 shows a frame structure of a power supply circuit in this embodiment. The power supply shutdown circuit 200 of the present embodiment further includes a low voltage output unit 270, and the low voltage output unit 270 is configured such that when the first terminal and the second terminal are disconnected, the low voltage output unit 270 connects the positive line and the negative line to output a low voltage signal. That is, when the first switching member 210 is turned off, the low voltage output unit 270 can output a low voltage signal to the load side 300.

It should be noted that, in the current power supply circuit, if the power supply shutdown circuit 200 is turned off, no voltage is output from the output terminal (corresponding to the side where the power supply shutdown circuit 200 is connected to the load side 300). However, in the field construction, a large number of electrical components are connected in series, so that it is difficult to match the component connection lines. In other words, it is difficult for a person to identify the output connector to which the power supply circuit corresponds. However, in this embodiment, after the power supply shutdown circuit 200 is disconnected, a test tool such as a multimeter can detect a low voltage signal at the output connector, so as to implement rapid detection, screening and pairing of the output connector of the power supply circuit.

Specifically, the value of the low voltage signal is smaller than the value of the high voltage signal, which is the voltage signal output from the power supply side 100 to the load side 300. In some embodiments, the voltage value of the low voltage signal is 1V.

In some embodiments of the present utility model, please continue to refer to fig. 4, the low voltage output unit 270 of the present embodiment includes a first resistor R1, a second resistor R2, and a sixth switch element S6. The first resistor R1 and the second resistor R2 are disposed in series between the positive and negative lines. The sixth switching element S6 has one end connected between the first resistor R1 and the second resistor R2 and the other end connected to one end of the positive line near the load side 300. It is understood that the first resistor R1 serves as a step-down resistor, and the value of the low voltage signal is determined by the resistance ratio of the first resistor R1 and the second resistor R2.

In some embodiments, the low voltage output unit 270 further includes a third capacitor C3, a ninth diode D9, and a fourth resistor R4. One end of the fourth resistor R4 is connected with the positive line, and the other end of the fourth resistor R4 is connected with one end of the first resistor R1, which is far away from the second resistor R2. That is, the value of the low voltage signal is determined by the resistance ratio of the sum of the first resistor R1 and the fourth resistor R4 to the second resistor R2. One end of the ninth diode D9 is connected to the negative line, and the other end is connected between the first resistor R1 and the fourth resistor R4. One end of the third capacitor C3 is connected with the negative line, and the other end of the third capacitor C is connected between the first resistor R1 and the fourth resistor R4.

In some embodiments, the control unit 250 is configured to control on/off of the sixth switch element S6. The sixth switching element S6 is selected from one of a relay, an optocoupler, a MOS transistor, a triode, and an IGBT.

In some embodiments, the sixth switching element S6 may be replaced by a shorting bar, and the first switching element 210 may be turned off to achieve low voltage output.

In some embodiments, the low voltage output unit 270 may be a linear power supply or a switching power supply.

In some embodiments of the present utility model, referring to fig. 7, fig. 7 shows a frame structure of a power supply circuit in this embodiment. The power supply shutdown circuit 200 of the present embodiment further includes a dummy load unit 280, and the dummy load unit 280 is connected between the positive electrode line and the negative electrode line. In some embodiments, when the first switch 210 is turned off, the dummy load unit 280 can provide a loop for the leakage current of the first switch 210 to ensure the normal output of the low voltage output unit 270 in the circuit.

In some embodiments, with continued reference to fig. 4, the dummy load unit 280 includes a fifth resistor R5, where one end of the fifth resistor R5 is connected to the positive line and the other end is connected to the negative line.

In some embodiments, the power shutdown circuit 200 further includes a first diode, one end of which is connected to the positive line, and the other end of which is connected to the negative line. And the first diode is disposed at a side of the power supply shutdown circuit 200 near the load side 300.

In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.

While the basic concepts have been described above, it will be apparent to those skilled in the art that the foregoing detailed disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements and adaptations of the utility model may occur to one skilled in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.

Meanwhile, the present utility model uses specific words to describe embodiments of the present utility model. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the utility model. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the utility model may be combined as suitable.

Similarly, it should be noted that in order to simplify the description of the present disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not intended to imply that more features than are required by the subject utility model. Indeed, less than all of the features of a single embodiment disclosed above.

Accordingly, in some embodiments, numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by the individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and employ a method for preserving the general number of digits. Although the numerical ranges and parameters set forth herein are approximations in some embodiments for use in determining the breadth of the range, in particular embodiments, the numerical values set forth herein are as precisely as possible.

Each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited herein is hereby incorporated by reference in its entirety except for any application history file that is inconsistent or otherwise conflict with the present disclosure, which places the broadest scope of the claims in this application (whether presently or after it is attached to this application). It is noted that the description, definition, and/or use of the term in the appended claims controls the description, definition, and/or use of the term in this utility model if the description, definition, and/or use of the term in the appended claims does not conform to or conflict with the present disclosure.

The foregoing has outlined the detailed description of the embodiments of the present utility model, and the detailed description of the principles and embodiments of the present utility model is provided herein by way of example only to facilitate the understanding of the method and core concepts of the present utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present utility model, the present description should not be construed as limiting the present utility model.

Claims (10)

1. A power supply shutdown circuit (200) for use in a power supply circuit, the power supply circuit comprising a power supply side (100) and a load side (300), the power supply side (100) and the load side (300) being connected by a positive line and a negative line to form a power supply loop, the power supply shutdown circuit (200) comprising:

a first switching element (210), the first switching element (210) being arranged on the positive line; the first switch element (210) comprises a first end for connecting to the supply side (100), a second end for connecting to the load side (300), and a control end;

a driving unit (230) connected to the control terminal and configured to output a driving signal to the control terminal to control on or off between the first terminal and the second terminal;

-a first capacitance (220), the first capacitance (220) being coupled between the control terminal and the second terminal;

-a bleed unit (240), the bleed unit (240) being coupled to both ends of the first capacitor (220), the bleed unit (240) having an on-state and an off-state, and the bleed unit (240) being configured such that, when the drive unit (230) outputs a drive signal to control the off between the first end and the second end, the bleed unit (240) is in the on-state to discharge the first capacitor (220).

2. The power shut-off circuit according to claim 1, wherein the bleed unit (240) comprises a second switch element (S2), the second switch element (S2) being coupled on the first and second ends; wherein the second switch piece (S2) is selected from one of a relay, an optocoupler, a MOS tube, a triode and an IGBT; the first switch piece (210) is selected from one of a MOS tube, a triode and an IGBT.

3. The power supply shutoff circuit according to claim 1, wherein the driving unit (230) includes:

the second capacitor (C2) is a charging capacitor, one end of the second capacitor (C2) is connected with the control end, and the other end of the second capacitor is connected with the second end;

a third switching element (S3) arranged between the second capacitor (C2) and the control terminal;

a fourth switching element (S4) arranged between said second capacitor (C2) and said second terminal;

wherein the second capacitor (C2) outputs the driving signal when the third switch element (S3) and the fourth switch element (S4) are closed.

4. A power shut down circuit according to claim 3, wherein the power shut down circuit (200) further comprises a charging unit (260), the charging unit (260) comprising a first charging side (261) and a second charging side (262); one end of the second capacitor (C2) is connected with the first charging side (261), and the other end of the second capacitor is connected with the second charging side (262); one side of the first charging side (261) deviating from the second capacitor (C2) is connected with the positive electrode line, and one side of the second charging side (262) deviating from the second capacitor (C2) is connected with the negative electrode line.

5. The power shutdown circuit according to claim 4, characterized in that a fifth switching element (S5) is provided on the first charging side (261) and/or the second charging side (262), the fifth switching element (S5) having a first state in which it is periodically conductive and a second state in which it is completely disconnected;

when the fifth switch (S5) is in a first state and the fifth switch (S5) is turned on, the second capacitor (C2) enters a charging state; when the fifth switch (S5) is turned off, the second capacitor (C2) enters a discharging state and supplies power to the first capacitor (220) so that the first switch (210) is in a normally closed state;

when the fifth switching element (S5) is in the second state, the second capacitor (C2) and the first capacitor (220) are sequentially discharged to place the first switching element (210) in an off state.

6. The power supply shutdown circuit according to claim 1, wherein the power supply shutdown circuit (200) further comprises a low voltage output unit (270), the low voltage output unit (270) being configured such that when the first terminal and the second terminal are disconnected, the low voltage output unit (270) connects the positive line and the negative line to output a low voltage signal; the value of the low-voltage signal is smaller than that of the high-voltage signal, and the high-voltage signal is a voltage signal output to the load side (300) by the power supply side (100).

7. The power supply shutdown circuit according to claim 6, wherein the low voltage output unit (270) includes a first resistor (R1), a second resistor (R2), and a sixth switching element (S6), the first resistor (R1) and the second resistor (R2) being disposed in series between the positive electrode line and the negative electrode line; one end of the sixth switch piece (S6) is connected between the first resistor (R1) and the second resistor (R2), and the other end of the sixth switch piece is connected with one end of the positive electrode line, which is close to the load side (300).

8. The power shutdown circuit as defined in claim 6, wherein the power shutdown circuit (200) further comprises a dummy load unit (280), the dummy load unit (280) being connected between the positive line and the negative line.

9. The power supply shutoff circuit according to claim 1, wherein the power supply shutoff circuit (200) further includes:

the sampling unit is connected in series with the positive electrode line or the negative electrode line; the sampling unit is used for acquiring a power carrier signal and outputting a first sampling signal according to the power carrier signal;

and the control unit (250) is used for receiving the first sampling signal and selectively controlling the driving unit (230) to output the driving signal according to the first sampling signal.

10. A power supply circuit for supplying power to a load side, characterized in that the power supply circuit comprises a power supply side (100) and a power supply shut-off circuit (200) according to any one of claims 1 to 9, the power supply shut-off circuit (200) being arranged between the power supply side (100) and the load side (300) and being adapted to control on/off of the power supply side (100) and the load side (300); wherein the power supply side (100) comprises a photovoltaic device for converting solar energy into electrical energy required by the load side (300).