CN218335949U - Photovoltaic power supply control circuit, photovoltaic power supply control device and power supply equipment - Google Patents
Photovoltaic power supply control circuit, photovoltaic power supply control device and power supply equipment Download PDFInfo
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Abstract
The application relates to the technical field of electronic circuits, in particular to a photovoltaic power supply control circuit, a photovoltaic power supply control device and power supply equipment, wherein the photovoltaic power supply control circuit comprises a switch control circuit, a power consumption circuit, a protection circuit and an auxiliary power supply circuit; when solar panel's output voltage is less than first preset voltage value, the power consumption circuit switches on in order to consume solar panel's output, when solar panel's output voltage is greater than first preset voltage value, the power consumption circuit disconnection is so that the voltage of auxiliary power supply circuit's first end is the open circuit voltage of photovoltaic board, protection circuit makes the power consumption circuit disconnection when solar panel's output voltage is greater than second preset voltage value, avoid too big output voltage to flow through the power consumption circuit, lead to the component damage on the power consumption circuit, the problem recurrence that MPPT circuit restarted repeatedly when solar panel's output power is less has been prevented, solar panel's life has been prolonged.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a photovoltaic power supply control circuit, a photovoltaic power supply control device and power supply equipment.
Background
In a solar power supply (photovoltaic power supply) scene, in order to avoid that the output power of the solar panel is too low, which causes the MPPT circuit to be repeatedly turned on and off, a conventional scheme is to add an element with smaller power, and when the output power of the solar panel is low, the output power of the solar panel is consumed.
However, in practical use, it is found that the problem of repeated turning on and off of the MPPT circuit still occurs repeatedly by adding a component with smaller power, which has a serious influence on the life of the solar panel and also reduces the service life of the rear load.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present application provides a photovoltaic power supply control circuit, a photovoltaic power supply control device and power supply equipment, and aims to solve the problem that an MPPT circuit is repeatedly restarted when the output power of a solar panel is low.
A first aspect of an embodiment of the present application provides a photovoltaic power supply control circuit, including a switch control circuit, a protection circuit, a power consumption circuit, and an auxiliary power supply circuit;
the first end of the power consumption circuit is respectively connected with the first end of the auxiliary power supply circuit and the first end of the protection circuit and is used for being connected with the anode output end of the solar panel so as to receive the output voltage of the solar panel; the second end of the power consumption circuit is connected with the second end of the auxiliary power supply circuit and the second end of the switch control circuit and is used for being connected to the negative electrode output end of the solar panel; a first input end of the switch control circuit is connected to a first output end of the auxiliary power supply circuit, a second input end of the switch control circuit is connected to a second end of the protection circuit, an output end of the switch control circuit is connected with a control end of the power consumption circuit, and a second output end of the auxiliary power supply circuit is used for being connected with the MPPT circuit to supply power to the MPPT circuit;
the power consumption circuit is used for consuming the output power of the solar panel when a disconnection signal is not received, so that the auxiliary power supply circuit is closed when the output voltage is smaller than a first preset voltage value;
the auxiliary power supply circuit is used for starting when the output voltage reaches the first preset voltage value and outputting a first electric signal to the switch control circuit;
the protection circuit is used for sending a second electric signal to the switch control circuit when the output voltage is greater than a second preset voltage value, wherein the second preset voltage value is greater than the first preset voltage value;
the switch control circuit is used for outputting a disconnection signal to the power consumption circuit when receiving the first electric signal or the second electric signal.
In one embodiment, the protection circuit comprises a voltage stabilizing unit and a first voltage dividing unit;
the first end of the voltage stabilizing unit is used as the first end of the protection circuit, the second end of the voltage stabilizing unit is connected with the first end of the first voltage dividing unit, and the second end of the first voltage dividing unit is used as the second end of the protection circuit.
In one embodiment, the voltage regulator unit includes at least one voltage regulator diode, a cathode of the voltage regulator diode is used as the first end of the protection circuit, and an anode of the voltage regulator diode is connected with the first end of the first voltage division unit.
In one embodiment, the power consumption circuit comprises a power consumption unit, a first switch unit and a second voltage division unit; the first end of the power consumption unit is connected with the first end of the second voltage division unit, the first end of the power consumption unit is used as the first end of the power consumption circuit, and the second end of the power consumption unit is connected with the first end of the first switch unit; the second end of the first switch unit is connected with the second end of the second voltage division unit, the second end of the first switch unit serves as the second end of the power consumption circuit, the voltage division end of the second voltage division unit is connected with the control end of the first switch unit, and the control end of the first switch unit serves as the control end of the power consumption circuit.
In one embodiment, the power consumption circuit further includes a clamping unit, a first terminal of the clamping unit is connected to the control terminal of the first switch unit, a second terminal of the clamping unit is grounded, and the clamping unit is configured to limit a voltage of the control terminal of the first switch unit.
In one embodiment, the switching control circuit includes a third voltage division unit and a second switching unit; the third voltage division unit comprises a first voltage division resistor and a second voltage division resistor, and the second switch unit comprises a first switch tube;
a first end of the first voltage-dividing resistor is used as a first input end of the switch control circuit, a second end of the first voltage-dividing resistor is connected with a control end of the first switch tube and a first end of the second voltage-dividing resistor, a first conduction end of the first switch tube is used as an output end of the switch control circuit, and a second conduction end of the first switch tube and a second end of the second voltage-dividing resistor are jointly connected and then used as a second end of the switch control circuit.
In one embodiment, the solar power supply further comprises a reverse connection prevention circuit, a first end of the reverse connection prevention circuit is used for being connected with the positive output end of the solar panel, a second end of the reverse connection prevention circuit is used for being connected with the first end of the power consumption circuit, and the reverse connection prevention circuit is used for preventing current in a rear-stage circuit from flowing backwards into the solar panel.
In one embodiment, the power supply further comprises a logic control circuit, the logic control circuit is connected between the first output terminal of the auxiliary power supply circuit and the first input terminal of the switch control circuit, and the logic control circuit is configured to receive the power provided by the auxiliary power supply circuit when the auxiliary power supply circuit is turned on, and output a third electrical signal to the switch control circuit after receiving the power;
and the switch control circuit is used for outputting a disconnection signal to the power consumption circuit when receiving the third electric signal.
A second aspect of the embodiments of the present application provides a photovoltaic power supply control device, including an MPPT circuit and the photovoltaic power supply control circuit as described in any one of the above;
the positive input end of the photovoltaic power supply control circuit is used for being connected with the positive output end of the solar panel, and the negative input end of the photovoltaic power supply control circuit is used for being connected with the negative output end of the solar panel; the positive output end of the photovoltaic power supply control circuit is connected with the positive input end of the MPPT circuit, and the negative output end of the photovoltaic power supply control circuit is connected with the negative input end of the MPPT circuit.
A third aspect of embodiments of the present application provides a power supply apparatus comprising a battery circuit, an MPPT circuit, and a photovoltaic power supply control circuit as described in any one of the above;
the positive input end of the photovoltaic power supply control circuit is used for being connected with the positive output end of the solar panel, and the negative input end of the photovoltaic power supply control circuit is used for being connected with the negative output end of the solar panel;
the positive output end of the photovoltaic power supply control circuit is connected with the positive input end of the MPPT circuit, and the negative output end of the photovoltaic power supply control circuit is connected with the negative input end of the MPPT circuit;
the output end of the MPPT circuit is connected with the battery circuit.
According to the photovoltaic power supply control circuit provided by the embodiment of the application, the output power of the solar panel is consumed when the power consumption circuit does not receive the disconnection signal; when the power consumption circuit receives the disconnection signal, the power consumption circuit is disconnected, and the consumption of the output power of the solar panel is stopped. The disconnection signal is from the switch control circuit, and the switch control circuit outputs the disconnection signal to the power consumption circuit when receiving the first electric signal or the second electric signal. The first electric signal comes from the auxiliary power supply circuit, and the second electric signal comes from the protection circuit. The auxiliary power supply circuit is started when the output voltage reaches a first preset voltage value, and outputs a first electric signal to the switch control circuit; and when the output voltage is greater than a second preset voltage value, the protection circuit sends a second electric signal to the switch control circuit, and the second preset voltage value is greater than the first preset voltage value. This application has when electric energy output when solar panel, solar panel's output voltage can transmit the first end of power consumption circuit, if output voltage is greater than or equal to the second and predetermines the magnitude of voltage, protection circuit can export the second signal of telecommunication for the on-off control circuit this moment, with the disconnection of control power consumption circuit, avoid too big voltage to flow through the power consumption circuit, damage the component of power consumption circuit, the component damage that has prevented because of the power consumption circuit leads to the power consumption circuit to become invalid, prevent that the problem that the MPPT circuit restarted repeatedly from appearing when solar panel's output power is less, solar panel's life has been prolonged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a photovoltaic power supply control circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a photovoltaic power supply control circuit according to an embodiment of the present application;
fig. 3 is a schematic diagram of a photovoltaic power supply control circuit according to another embodiment of the present application;
fig. 4 is a schematic diagram of a photovoltaic power supply control apparatus according to an embodiment of the present application;
fig. 5 is a schematic diagram of a power supply device according to an embodiment of the present application.
The above reference numbers illustrate:
10. a solar panel; 100. a photovoltaic power supply control circuit; 200. a photovoltaic power supply control device; 300. a power supply device; 110. a power dissipation circuit; 120. a switch control circuit; 130. an auxiliary power supply circuit; 140. a protection circuit; 150. a logic control circuit; 160. a reverse circuit prevention circuit; 210. an MPPT circuit; 111. a power dissipating unit; 112. a first switch unit; 113. a second voltage division unit; 114. a clamping unit; 115. a slow start unit; 121. a second switching unit; 122. a third partial pressure unit; 141. a voltage stabilization unit; 142. a first voltage division unit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, a schematic diagram of a photovoltaic power supply control circuit 100 is shown, and an embodiment of the present application provides a photovoltaic power supply control circuit 100, where the photovoltaic power supply control circuit 100 includes a switch control circuit 120, a protection circuit 140, a power consumption circuit 110, and an auxiliary power circuit 130.
The first terminal of the power dissipation circuit 110 is connected to the first terminal of the auxiliary power circuit 130 and the first terminal of the protection circuit 140, respectively, and is used for connecting the positive output terminal of the solar panel 10 to receive the output voltage of the solar panel 10. The second terminal of the power dissipation circuit 110 is connected to the second terminal of the auxiliary power circuit 130 and the second terminal of the switch control circuit 120, and is used for being connected to the negative output terminal of the solar panel 10. A first input terminal of the switching control circuit 120 is connected to a first output terminal of the auxiliary power circuit 130, a second input terminal of the switching control circuit 120 is connected to a second terminal of the protection circuit 140, an output terminal of the switching control circuit 120 is connected to a control terminal of the power consumption circuit 110, and a second output terminal of the auxiliary power circuit 130 is used for connecting the MPPT circuit 210 to supply power to the MPPT circuit 210.
The power consumption circuit 110 is configured to consume the output power of the solar panel 10 when the turn-off signal is not received, such that when the output voltage of the solar panel 10 is smaller than the first preset voltage value, the auxiliary power circuit 130 is turned off because the power of the solar panel 10 is not received, and when the auxiliary power circuit 130 is turned off, the output voltage of the auxiliary power circuit 130 is 0v, and the mppt circuit 210 cannot be turned on.
In this embodiment, when the output voltage of the solar panel 10 does not reach the first preset voltage value, the power consumption circuit 110 may consume all the output power of the solar panel 10, so that the auxiliary power circuit 130 cannot be powered on. For example, if the first predetermined voltage value is 5V, if the output voltage of the solar panel 10 is less than 5V, the output power of the corresponding solar panel 10 is also low, and therefore, the output power of the solar panel 10 is completely consumed by the power consumption circuit 110 before reaching the auxiliary power circuit 130, and in this case, the power consumption circuit 110 cannot start the corresponding MPPT circuit 210, and the MPPT circuit 210 is not started.
The auxiliary power circuit 130 is configured to start when the output voltage of the solar panel 10 reaches a first preset voltage value, and output a first electrical signal to the switch control circuit 120. When the auxiliary power circuit 130 is started, a preset voltage is output to the MPPT circuit 210 for power supply, and after the auxiliary power circuit 130 is started, the MPPT circuit 210 is turned on.
In this embodiment, when the output voltage of the solar panel 10 reaches the first predetermined voltage value, the power consumption circuit 110 cannot consume all the output power of the solar panel 10, so that the auxiliary power circuit 130 is powered on. For example, when the first preset voltage value is 5V, if the output voltage of the solar panel 10 is greater than 5V, the output power of the corresponding solar panel 10 is high, and therefore, the power consumption circuit 110 cannot consume all the output power of the solar panel 10, and the output power of the solar panel 10 can reach the auxiliary power circuit 130, in this case, after the auxiliary power circuit 130 is started, the MPPT circuit 210 is turned on, and at the same time, after the auxiliary power circuit 130 is started, the first electric signal is output to the switch control circuit 120.
The protection circuit 140 is configured to send a second electrical signal to the switch control circuit 120 when the output voltage of the solar panel 10 is greater than a second preset voltage value, where the second preset voltage value is greater than the first preset voltage value. It is understood that the first preset voltage value and the second preset voltage value are set according to actual needs.
The protection circuit 140 is used to prevent the excessive voltage from flowing to the power consumption circuit 110 when the output voltage of the solar panel 10 is too large, so that the second electrical signal can be sent to the switch control circuit 120 to control the power consumption circuit 110 to be turned off.
In practical applications, the second predetermined voltage value may be determined according to the performance of the components of the power consumption circuit 110, for example, the maximum voltage that can be accepted by the components of the power consumption circuit 110 is 150V, and if the output voltage of the solar panel 10 exceeds 150V, the components of the power consumption circuit 110 may be damaged, which results in the power consumption circuit 110 being inoperative, and the second predetermined voltage value may be set to 150V or lower than 150V. The first preset voltage value may be set to be greater than the input under-voltage point by a certain value range according to the input under-voltage point of the MPPT circuit 210. For example, when the input under-voltage point of the MPPT circuit 210 is 5V, the first preset voltage value may be 15V. The first preset voltage value and the second preset voltage value can be determined according to other modes.
The switch control circuit 120 is configured to output a disconnection signal to the power consumption circuit 110 when receiving the first electrical signal or the second electrical signal, and the power consumption circuit 110 stops consuming the output power of the solar panel 10 after receiving the disconnection signal, so that the voltage at the first end of the auxiliary power supply circuit 130 is the open-circuit voltage of the solar panel 10.
The photovoltaic power supply control circuit 100 provided in the first aspect of the embodiment of the present application consumes the output power of the solar panel 10 when the power consumption circuit 110 does not receive the turn-off signal; when power consuming circuit 110 receives the off signal, power consuming circuit 110 is turned off, and consumption of the output power of solar panel 10 is stopped. The disconnection signal is from the switch control circuit 120, and the switch control circuit 120 outputs the disconnection signal to the power consuming circuit 110 when receiving the first electrical signal or the second electrical signal. The first electrical signal is from the auxiliary power circuit 130, and the second electrical signal is from the protection circuit 140. The auxiliary power circuit 130 is activated when the output voltage reaches a first preset voltage value, and outputs a first electrical signal to the switch control circuit 120; when the output voltage of the protection circuit 140 is greater than the second preset voltage value, the second electric signal is sent to the switch control circuit 120, and the second preset voltage value is greater than the first preset voltage value. When the solar panel 10 outputs the electric energy, the output voltage of the solar panel 10 is transmitted to the first terminal of the power consumption circuit 110, and if the output voltage is greater than or equal to the second predetermined voltage value, the protection circuit 140 outputs a second electric signal to the switch control circuit 120 to control the power consumption circuit 110 to be turned off. The power consumption circuit 110 is prevented from being damaged due to the fact that excessive voltage flows through the power consumption circuit 110, the power consumption circuit 110 is prevented from being failed due to the fact that the elements of the power consumption circuit 110 are damaged, the problem that the MPPT circuit 210 is repeatedly restarted when the output power of the solar panel 10 is low is prevented from being repeated, and the service life of the solar panel 10 is prolonged.
Referring to the schematic diagram of the photovoltaic power supply control circuit 100 shown in fig. 1 and the schematic circuit diagram of the photovoltaic power supply control circuit 100 shown in fig. 2, in one embodiment, the photovoltaic power supply control circuit 100 includes a switch control circuit 120, a protection circuit 140, a power consumption circuit 110, and an auxiliary power circuit 130.
The protection circuit 140 includes a voltage stabilization unit 141 and a first voltage division unit 142. A first terminal of the voltage stabilizing unit 141 serves as a first terminal of the protection circuit 140, a second terminal of the voltage stabilizing unit 141 is connected to a first terminal of the first voltage dividing unit 142, and a second terminal of the first voltage dividing unit 142 serves as a second terminal of the protection circuit 140. The voltage regulation value of the voltage regulation unit 141 may be a second preset voltage value, and when the output voltage of the solar panel 10 is greater than the second preset voltage value, the voltage regulation unit 141 provides a path to the switch control circuit 120 to trigger the switch control circuit 120 to control the power consumption circuit 110 to be turned off. The first voltage dividing unit 142 is connected in series between the first terminal and the second terminal of the protection circuit 140, and functions to limit or divide the voltage.
Referring to the schematic circuit diagram of the photovoltaic power supply control circuit 100 shown in fig. 2, in one embodiment, specifically, the voltage stabilizing unit 141 includes at least one voltage stabilizing diode D1, a cathode of the voltage stabilizing diode D1 is used as a first end of the protection circuit 140, and an anode of the voltage stabilizing diode D1 is connected to a first end of the first voltage dividing unit 142. Here, the sum of the reverse breakdown voltages of the zener diodes D1 may be used as the second preset voltage value, for example, the sum of the reverse breakdown voltages of the zener diodes may be 150V. Fig. 2 shows an embodiment in which the voltage regulator unit 141 includes a voltage regulator diode D1 and the first voltage divider unit 142 employs a resistor R6, a cathode of the voltage regulator diode D1 is used as a first end of the protection circuit 140, an anode of the voltage regulator diode D1 is connected to a first end of the resistor R6, and a second end of the resistor R6 is used as a second end of the protection circuit 140. It should be understood that the embodiment of the present application only shows that the voltage stabilization unit 141 includes the voltage stabilization diode D1, and should not be construed as limiting the present application. In some embodiments, the voltage regulation unit 141 includes a plurality of voltage regulation diodes D1, the voltage regulation diodes D1 are connected in series, and the sum of reverse breakdown voltages of the voltage regulation diodes D1 is used as the second preset voltage value.
Referring to the schematic diagram of the photovoltaic power supply control circuit 100 shown in fig. 1 and the schematic circuit diagram of the photovoltaic power supply control circuit 100 shown in fig. 2, in an embodiment, the power consumption circuit 110 includes a power consumption unit 111, a first switch unit 112, and a second voltage division unit 113. A first terminal of the power consuming unit 111 is connected to a first terminal of the second voltage dividing unit 113, the first terminal of the power consuming unit 111 serves as a first terminal of the power consuming circuit 110, and a second terminal of the power consuming unit 111 is connected to a first terminal of the first switching unit 112. The second terminal of the first switch unit 112 is connected to the second terminal of the second voltage divider unit 113, the second terminal of the first switch unit 112 is used as the second terminal of the power consumption circuit 110, the voltage dividing terminal of the second voltage divider unit 113 is connected to the control terminal of the first switch unit 112, and the control terminal of the first switch unit 112 is used as the control terminal of the power consumption circuit 110.
Referring to the schematic circuit diagram of the photovoltaic power supply control circuit 100 shown in fig. 2, specifically, the power consumption unit 111 includes a resistor R1, the first switching unit 112 includes a switching tube Q1, the switching tube Q1 is, for example, an NMOS tube, a drain, a source, and a gate of the switching tube Q1 are respectively used as a first end, a second end, and a control end of the first switching unit 112, the second voltage dividing unit 113 includes a resistor R2 and a resistor R3, the first end of the resistor R1 is used as a first end of the second voltage dividing unit 113, the second end of the resistor R3 is used as a second end of the second voltage dividing unit 113, and a connection node of the resistor R2 and the resistor R3 is used as a voltage dividing end of the second voltage dividing unit 113. Specifically, the second end of the resistor R1 is connected to the drain of the switch tube Q1, the first end of the resistor R2 is connected to the first end of the resistor R1, the second end of the resistor R2 is connected to the gate of the switch tube Q1 and to the first end of the resistor R3, the second end of the resistor R3 is connected to the source of the switch tube Q1, and when the output voltage of the solar panel 10 is greater than the first voltage preset value, the output voltage reaches the gate of the switch tube Q1 after being divided by the resistor R2 and the resistor R3, and the switch tube Q1 can be driven to be turned on, so that the resistor R1 can consume the power of the output voltage of the solar panel 10.
It is understood that, in some embodiments, the power consumption unit 111 may further include a plurality of resistors connected in series/parallel with each other, and the embodiment of the present application is only illustrated as including the resistor R1, and should not be construed as limiting the present application. Illustratively, the resistor R1 may be a cement resistor.
Referring to the schematic circuit diagram of the photovoltaic power control circuit 100 shown in fig. 2, in an embodiment, the power consumption circuit 110 further includes a clamping unit 114, a first terminal of the clamping unit 114 is connected to the control terminal of the first switch unit 112, a second terminal of the clamping unit 114 is connected to ground, and the clamping unit 114 is configured to limit a voltage of the control terminal of the first switch unit 112. Referring to fig. 2, the clamping unit 114 includes a clamping diode D2, a cathode of the clamping diode D2 is connected to the control terminal of the first switching unit 112 as a first terminal of the clamping unit 114, an anode of the clamping diode D2 is connected to ground as a second terminal of the clamping unit 114, and the clamping diode D2 is used for a voltage between a gate and a source of the switching tube Q1, so as to prevent the switching tube Q1 from being damaged due to a large voltage impact.
Referring to the schematic circuit diagram of the photovoltaic power supply control circuit 100 shown in fig. 2, in an embodiment, the power consumption circuit 110 further includes a slow start unit 115, the slow start unit 115 includes a capacitor C2, and the capacitor C2 is used for slow start to prevent the switch Q1 from being damaged due to an impact of an excessive current on the switch Q1.
Referring to the schematic diagram of the photovoltaic power supply control circuit 100 shown in fig. 1 and the schematic circuit diagram of the photovoltaic power supply control circuit 100 shown in fig. 2, in one embodiment, the photovoltaic power supply control circuit 100 includes a switch control circuit 120, a protection circuit 140, a power consumption circuit 110, and an auxiliary power circuit 130. The switch control circuit 120 includes a third voltage dividing unit 122 and a second switch unit 121, the third voltage dividing unit 122 includes a first voltage dividing resistor R4 and a second voltage dividing resistor R5, and the second switch unit 121 includes a first switch tube Q2.
A first end of the first voltage-dividing resistor R4 is used as a first input end of the switch control circuit 120 to be connected to a second end of the protection circuit 140, a second end of the first voltage-dividing resistor R4 is connected to a control end of the first switch Q2 and a first end of the second voltage-dividing resistor R5, a first conducting end of the first switch Q2 is used as an output end of the switch control circuit 120 to be connected to a control end of the power dissipation circuit 110, a second conducting end of the first switch Q2 and a second end of the second voltage-dividing resistor R5 are commonly connected and then used as a second end of the switch control circuit 120 to be grounded, the second voltage-dividing resistor R5 can be used for current limiting or voltage dividing, wherein the second voltage-dividing resistor R5 can also enable a gate voltage of the first switch Q2 to be greater than a drain voltage, so that the first switch Q2 can be conducted. The first switch tube Q2 is an NMOS tube, the drain, the source, and the gate of the first switch tube Q2 correspond to the first conducting end, the second conducting end, and the control end of the first switch tube Q2, respectively, when the auxiliary power circuit 130 is turned on, the voltage at the first output end of the auxiliary power circuit 130 is divided by the resistors R4 and R5 to form a divided voltage at the gate of the first switch tube Q2, so as to drive the first switch tube Q1 to be turned on, and thus the gate voltage of the switch tube Q1 is decreased and turned off, the power consumption circuit 110 is turned off, and the resistor R1 stops consuming the output power of the solar panel 10.
Referring to the schematic circuit diagram of the photovoltaic power supply control circuit 100 shown in fig. 2, in an embodiment, the switch control circuit 120 further includes a capacitor C1, the capacitor C1 is connected between the gate and the source of the first switch Q2, and the capacitor C1 is used to prevent the first switch Q2 from being damaged due to an excessive current impacting the first switch Q2.
Referring to fig. 1 and fig. 2, the photovoltaic power supply control circuit 100 further includes a reverse-connection prevention circuit 160, in one embodiment, a first end of the reverse-connection prevention circuit 160 is used for connecting to the positive output terminal of the solar panel 10, and a second end of the reverse-connection prevention circuit 160 is used for connecting to the first end of the power consumption circuit 110. The anti-reverse circuit 160 is used to prevent the current in the later stage circuit, such as the auxiliary power circuit 130 and the MPPT circuit 210, from flowing back into the solar panel 10 to damage the solar panel 10. In one embodiment, referring to fig. 2, the anti-reverse circuit 160 includes an anti-reverse diode D3, an anode of the anti-reverse diode D3 is used for connecting to the anode output terminal of the solar panel 10, and a cathode of the anti-reverse diode D3 is used for connecting to the first terminal of the power consumption circuit 110.
In some embodiments, the photovoltaic power supply control circuit 100 includes a plurality of anti-reverse circuits 160, wherein a first end of each anti-reverse circuit 160 is used to connect to the positive output terminals of the plurality of solar panels 10, and a second end of each anti-reverse circuit 160 is commonly connected to and connected to the first end of the power consumption circuit 110, so that the photovoltaic power supply control circuit 100 can connect to the plurality of solar panels 10, integrate the plurality of solar panels 10 together to perform power supply control, and improve the practicability of the photovoltaic power supply control circuit 100.
Referring to the schematic diagram of the photovoltaic power supply control circuit 100 shown in fig. 3, in an embodiment, the photovoltaic power supply control circuit 100 further includes a logic control circuit 150, the logic control circuit 150 is connected between the first output terminal of the auxiliary power circuit 130 and the first input terminal of the switch control circuit 120, the logic control circuit 150 is configured to receive the electric energy provided by the auxiliary power circuit 130 when the auxiliary power circuit 130 is turned on, and output a third electrical signal to the switch control circuit 120 after receiving the electric energy, and the switch control circuit 120 is configured to output a turn-off signal to the power consumption circuit 110 when receiving the third electrical signal. In an embodiment, the logic control circuit 150 includes an MCU, wherein the logic control circuit 150 outputs a third electrical signal to the switch control circuit 120 when receiving the power provided by the auxiliary power circuit 130, and the third electrical signal is a transmission logic for the logic control circuit 150 to output the third electrical signal according to a preset output, such as delaying for a certain time, or setting another preset third electrical signal when the logic control circuit 150 confirms that the auxiliary power circuit 130 is turned on, so as to implement more flexible control of the switch control circuit 120.
Referring to fig. 4, a second aspect of the present embodiment provides a photovoltaic power supply control apparatus 200, which includes an MPPT circuit 210 and the photovoltaic power supply control circuit 100 according to the first aspect of the present embodiment.
The positive input end of the photovoltaic power supply control circuit 100 is used for being connected with the positive output end PV + of the solar panel 10, the negative input end of the photovoltaic power supply control circuit 100 is used for being connected with the negative output end PV-of the solar panel 10, the positive output end of the photovoltaic power supply control circuit 100 is connected with the positive input end of the MPPT circuit 210, and the negative output end of the photovoltaic power supply control circuit 100 is connected with the negative input end of the MPPT circuit 210. The output of MPPT circuit 210 is connected to battery circuit 310, for example, the positive output of MPPT circuit 210 is connected to the positive terminal of battery circuit 310, and the negative output of MPPT circuit 210 is connected to the negative terminal of battery circuit 310. In one embodiment, the positive input of the photovoltaic power supply control circuit 100 is used for connecting with the positive output of the plurality of solar panels 10.
In one embodiment, the battery circuit 310 may or may not include a charging circuit and a battery, for example, the charging circuit may be integrated with the battery or removably connected thereto.
The content of the photovoltaic power supply control circuit 100 is disclosed in the first aspect of the embodiment, and is not described herein again.
The photovoltaic power supply control device 200 can prevent an excessive voltage from flowing through the power consumption circuit 110 of the photovoltaic power supply control circuit 100, prevent elements of the power consumption circuit 110 from being damaged, prevent the power consumption circuit 110 from being invalid due to the damage of the elements of the power consumption circuit 110, prevent the MPPT circuit 210 from being repeatedly restarted when the output power of the solar panel 10 is small, and prolong the service life of the solar panel 10.
Referring to fig. 5, a third aspect of the embodiment of the present application provides a power supply apparatus 300, which includes a battery circuit 310, an MPPT circuit 210, and the photovoltaic power supply control circuit 100 according to the first aspect of the embodiment of the present application.
Wherein, the positive input end of the photovoltaic power supply control circuit 100 is used for being connected with the positive output end of the solar panel 10, and the negative input end of the photovoltaic power supply control circuit 100 is used for being connected with the negative output end of the solar panel 10. The positive output end of the photovoltaic power supply control circuit 100 is connected with the positive input end of the MPPT circuit 210, and the negative output end of the photovoltaic power supply control circuit 100 is connected with the negative input end of the MPPT circuit 210. The output of MPPT circuit 210 is connected to battery circuit 310. In one embodiment, the positive input of the photovoltaic power supply control circuit 100 is used for connecting with the positive output of the plurality of solar panels 10.
The content of the photovoltaic power supply control circuit 100 is disclosed in the first aspect of the embodiment, and is not described herein again.
The power supply device 300 can prevent an excessive voltage from flowing through the power consumption circuit 110 of the photovoltaic power supply control circuit 100, prevent elements of the power consumption circuit 110 from being damaged, prevent the power consumption circuit 110 from being disabled due to the damage of the elements of the power consumption circuit 110, prevent the MPPT circuit 210 from being repeatedly restarted when the output power of the solar panel 10 is small, and prolong the service life of the solar panel 10 in the power supply device 300.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A photovoltaic power supply control circuit is characterized by comprising a switch control circuit, a protection circuit, a power consumption circuit and an auxiliary power supply circuit;
the first end of the power consumption circuit is respectively connected with the first end of the auxiliary power supply circuit and the first end of the protection circuit and is used for being connected with the anode output end of the solar panel so as to receive the output voltage of the solar panel; the second end of the power consumption circuit is connected with the second end of the auxiliary power supply circuit and the second end of the switch control circuit and is used for being connected to the negative electrode output end of the solar panel; a first input end of the switch control circuit is connected to a first output end of the auxiliary power supply circuit, a second input end of the switch control circuit is connected to a second end of the protection circuit, an output end of the switch control circuit is connected with a control end of the power consumption circuit, and a second output end of the auxiliary power supply circuit is used for being connected with the MPPT circuit to supply power to the MPPT circuit;
the power consumption circuit is used for consuming the output power of the solar panel when a disconnection signal is not received, so that the auxiliary power supply circuit is closed when the output voltage is smaller than a first preset voltage value;
the auxiliary power supply circuit is used for starting when the output voltage reaches the first preset voltage value and outputting a first electric signal to the switch control circuit;
the protection circuit is used for sending a second electric signal to the switch control circuit when the output voltage is greater than a second preset voltage value, wherein the second preset voltage value is greater than the first preset voltage value;
the switch control circuit is used for outputting a disconnection signal to the power consumption circuit when receiving the first electric signal or the second electric signal.
2. The photovoltaic power supply control circuit of claim 1, wherein the protection circuit comprises a voltage regulation unit and a first voltage division unit;
the first end of the voltage stabilizing unit is used as the first end of the protection circuit, the second end of the voltage stabilizing unit is connected with the first end of the first voltage dividing unit, and the second end of the first voltage dividing unit is used as the second end of the protection circuit.
3. The pv power control circuit of claim 2 wherein the zener block comprises at least one zener diode, a cathode of the zener diode serving as the first terminal of the protection circuit, and an anode of the zener diode connected to the first terminal of the first voltage divider block.
4. The photovoltaic power supply control circuit of claim 1, wherein the power dissipating circuit comprises a power dissipating unit, a first switching unit, and a second voltage dividing unit; the first end of the power consumption unit is connected with the first end of the second voltage division unit, the first end of the power consumption unit is used as the first end of the power consumption circuit, and the second end of the power consumption unit is connected with the first end of the first switch unit; the second end of the first switch unit is connected with the second end of the second voltage division unit, the second end of the first switch unit serves as the second end of the power consumption circuit, the voltage division end of the second voltage division unit is connected with the control end of the first switch unit, and the control end of the first switch unit serves as the control end of the power consumption circuit.
5. The photovoltaic power supply control circuit of claim 4, wherein the power dissipation circuit further comprises a clamping unit, a first terminal of the clamping unit is connected with the control terminal of the first switching unit, a second terminal of the clamping unit is connected to ground, and the clamping unit is used for limiting the voltage of the control terminal of the first switching unit.
6. The photovoltaic power supply control circuit of claim 1, wherein the switching control circuit comprises a third voltage division unit and a second switching unit; the third voltage division unit comprises a first voltage division resistor and a second voltage division resistor, and the second switch unit comprises a first switch tube;
a first end of the first voltage-dividing resistor is used as a first input end of the switch control circuit, a second end of the first voltage-dividing resistor is connected with a control end of the first switch tube and a first end of the second voltage-dividing resistor, a first conduction end of the first switch tube is used as an output end of the switch control circuit, and a second conduction end of the first switch tube and a second end of the second voltage-dividing resistor are jointly connected and then used as a second end of the switch control circuit.
7. The photovoltaic power supply control circuit of claim 1, further comprising a reverse prevention circuit, wherein a first end of the reverse prevention circuit is used for connecting with a positive output end of the solar panel, a second end of the reverse prevention circuit is used for connecting with a first end of the power consumption circuit, and the reverse prevention circuit is used for preventing current in a rear-stage circuit from flowing backwards into the solar panel.
8. The photovoltaic power supply control circuit of claim 1, further comprising a logic control circuit connected between the first output terminal of the auxiliary power circuit and the first input terminal of the switch control circuit, the logic control circuit being configured to receive power provided by the auxiliary power circuit when the auxiliary power circuit is turned on and to output a third electrical signal to the switch control circuit after receiving the power;
and the switch control circuit is used for outputting the disconnection signal to the power consumption circuit when receiving the third electric signal.
9. A photovoltaic power supply control device, characterized by comprising an MPPT circuit and a photovoltaic power supply control circuit according to any one of claims 1 to 8;
the positive input end of the photovoltaic power supply control circuit is used for being connected with the positive output end of the solar panel, and the negative input end of the photovoltaic power supply control circuit is used for being connected with the negative output end of the solar panel; the positive output end of the photovoltaic power supply control circuit is connected with the positive input end of the MPPT circuit, and the negative output end of the photovoltaic power supply control circuit is connected with the negative input end of the MPPT circuit.
10. A power supply device characterized by comprising a battery circuit, an MPPT circuit, and a photovoltaic power supply control circuit according to any one of claims 1 to 8;
the positive input end of the photovoltaic power supply control circuit is used for being connected with the positive output end of the solar panel, and the negative input end of the photovoltaic power supply control circuit is used for being connected with the negative output end of the solar panel;
the positive output end of the photovoltaic power supply control circuit is connected with the positive input end of the MPPT circuit, and the negative output end of the photovoltaic power supply control circuit is connected with the negative input end of the MPPT circuit;
the output end of the MPPT circuit is connected with the battery circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221962037.9U CN218335949U (en) | 2022-07-26 | 2022-07-26 | Photovoltaic power supply control circuit, photovoltaic power supply control device and power supply equipment |
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| CN202221962037.9U CN218335949U (en) | 2022-07-26 | 2022-07-26 | Photovoltaic power supply control circuit, photovoltaic power supply control device and power supply equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024216849A1 (en) * | 2023-04-20 | 2024-10-24 | 深圳市德兰明海新能源股份有限公司 | Photovoltaic weak-current elimination circuit and energy storage power source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024216849A1 (en) * | 2023-04-20 | 2024-10-24 | 深圳市德兰明海新能源股份有限公司 | Photovoltaic weak-current elimination circuit and energy storage power source |
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Address after: 518000 Factory Building 401, Runheng Industrial Plant 1, Fuyuan Road, Zhancheng Community, Fuhai Street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Zhenghao Innovation Technology Co.,Ltd. Country or region after: China Address before: 518000, 1st Floor, Building E, Jiehe Industrial City, Shuitian Community, Shiyan Street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Zhenghao Innovation Technology Co.,Ltd. Country or region before: China |