Photovoltaic intelligent power supply system

Abstract

The utility model relates to a photovoltaic intelligent power supply system. The utility model is suitable for the field of photovoltaic technology. According to the technical scheme, the photovoltaic intelligent power supply system is characterized by comprising a power supply module which is provided with a solar cell and an electric power storage unit, and the electric power storage unit is connected with the solar cell in parallel after being connected with a switch S1 in series; the input end of the voltage stabilizing module is connected with the power supply module through the switch module; the sampling control module is connected to two ends of a series circuit of the electric power storage unit and the switch S1, is connected with the switch module, and is used for sampling voltage and controlling the switch module to be switched on after the sampled voltage reaches preset voltage; the relay is provided with a relay coil J1, the switch S1 and a switch S2, the relay coil J1 is connected to the output end of the voltage stabilizing module, and the switch S1 and the switch S2 are controlled to be switched off when the relay coil J1 is powered on; and the load X is connected to the output end of the voltage stabilizing module and is connected with the power storage unit through the switch S2.

Description

Technical Field

[0001] The utility model relates to a photovoltaic intelligent power supply system, which is applicable to the photovoltaic field. Background Art

[0002] The "mains parallel solar photovoltaic system" is a system that uses solar cells to provide electricity to the loads of the home when there is sufficient sunshine. If there is excess electricity, it will be stored separately. When the power generation is insufficient or there is no power generation, the required electricity will be provided by the power company. Currently, solar cells on the market often output too much voltage when the sun is strong, causing the power storage unit to be overcharged, which can easily damage the power storage unit and reduce the life of the power storage unit. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to provide a photovoltaic intelligent power supply system in view of the above-mentioned problems.

[0004] The technical solution adopted by the utility model is: a photovoltaic intelligent power supply system, characterized in that it includes:

[0005] A power module comprises a solar cell and a power storage unit, wherein the power storage unit is connected in series with a switch S1 and then connected in parallel with the solar cell;

[0006] A voltage stabilizing module, an input end of which is connected to the power supply module via a switch module;

[0007] A sampling control module, connected to both ends of the series circuit of the power storage unit and the switch S1, and connected to the switch module, for performing voltage sampling, and controlling the switch module to conduct after the sampled voltage reaches a preset voltage;

[0008] A relay, comprising a relay coil J1 and the switch S1 and a switch S2, wherein the relay coil J1 is connected to the output end of the voltage stabilizing module, and when the relay coil J1 is energized, the switches S1 and S2 are controlled to be disconnected;

[0009] The load X is connected to the output end of the voltage stabilizing module and is connected to the power storage unit via the switch S2.

[0010] The sampling control module comprises:

[0011] A sampling circuit, connected to both ends of the series circuit of the power storage unit and the switch S1, for performing voltage sampling;

[0012] A controllable precision voltage-stabilizing source D2 has a reference electrode connected to the sampling circuit and a negative electrode connected to the control end of the switch module.

[0013] The sampling circuit has a potentiometer RP1, two ends of which are respectively connected to two ends of a series circuit of the power storage unit and the switch S1, and a middle end of the potentiometer RP1 is connected to a reference electrode of the controllable precision voltage stabilizing source D2.

[0014] The switch module adopts a transistor V1, the emitter and collector of the transistor V1 are respectively connected to the power module and the voltage stabilizing module, and the base of the transistor V1 is connected to the negative electrode of the controllable precision voltage stabilizing source D2.

[0015] The beneficial effect of the utility model is as follows: after the power storage unit is charged to make the voltage reach the rated voltage, the sampling control module and the switch module control the voltage stabilizing module to output a stable voltage, the relay coil J1 is energized, and the switch S1 is opened. Therefore, when the power storage unit is fully charged, the solar cell will stop supplying power to the power storage unit and instead supply power to the load through the switch module, the voltage stabilizing module, etc., to avoid overcharging of the power storage unit.

[0016] When the output voltage of the solar cell is low, the switch module is disconnected, the voltage stabilizing module stops outputting a stable voltage, the relay coil J1 loses power, and the switch S1 is closed, thereby automatically switching to the power storage unit for power supply. The power storage unit supplies power to the load via the switch S2, thereby ensuring that the load has a stable power supply voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A circuit diagram of an embodiment. DETAILED DESCRIPTION

[0018] This embodiment is a photovoltaic intelligent power supply system, including: a power supply module, a switch module, a voltage stabilization module, a sampling control module, a relay and a load X, etc.

[0019] In this example, the power module has a battery E1 and a battery E2. The positive electrode of the battery E1 is connected to the positive electrode of the diode D1. The battery E1 is a solar cell that converts solar energy into electrical energy. The negative electrode of the diode D1 is connected to one end of the switch S1. The other end of the switch S1 is connected to the battery E2. The battery E2 is a power storage unit that can store the electrical energy released by the battery E1. The negative electrode of the battery E2 is connected to the negative electrode of the battery E1.

[0020] In this embodiment, the switch module has a transistor V1, the emitter of which is connected between the diode D1 and the switch S1; the base of the transistor V1 is connected to the negative electrodes of the battery E1 and the battery E2 via the capacitor C1; the collector of the transistor V1 is connected to the negative electrodes of the battery E1 and the battery E2 via the light-emitting diode D4 and the resistor R2.

[0021] In this example, the sampling control module includes a sampling circuit and a controllable precision voltage regulator D2, wherein the sampling circuit uses a potentiometer RP1, the two ends of which are respectively connected to the two ends of the series circuit of the power storage unit and the switch S1, and the middle sliding end of the potentiometer RP1 is connected to the reference pole of the controllable precision voltage regulator D2.

[0022] In this embodiment, the cathode of the controllable precision voltage-stabilizing source D2 is connected between the diode D1 and the switch S1 via the resistor R1 , and the cathode of the controllable precision voltage-stabilizing source D2 is connected to the base of the transistor V1 .

[0023] In this embodiment, the voltage stabilizing module has a voltage stabilizer U1, the input end of the voltage stabilizer U1 is connected to the collector of the transistor V1, the ground end of the voltage stabilizer U1 is connected to the potentiometer RP2 and the resistor R3, the other end and the sliding end of the potentiometer RP2 are connected to the negative electrodes of the battery E1 and the battery E2, and the output end of the voltage stabilizer U1 is connected to the other end of the resistor R3.

[0024] In this example, the relay has a relay coil J1, and a switch S1 and a switch S2, wherein a first end of the relay coil J1 is connected to the output end of the voltage regulator U1, and a second end is connected to the negative electrodes of the battery E1 and the battery E2. When the relay coil J1 is energized, the switch S1 and the switch S2 are opened, and when the relay coil J1 is de-energized, the switch S1 and the switch S2 are closed.

[0025] In this embodiment, the output end of the voltage regulator U1 is connected to the cathode of the diode D5, the anode of the diode D5 is connected to the resistor R4, and the other end of the resistor R4 is connected to the cathodes of the battery E1 and the battery E2.

[0026] In this example, the output end of the voltage regulator U1 is connected to the first end of the load X, and the second end of the load X is connected to the negative electrodes of the battery E1 and the battery E2.

[0027] In this embodiment, one end of the switch S2 is connected between the diode D1 and the switch S1 , the other end of the switch S2 is connected to the anode of the diode D3 , and the cathode of the diode D3 is connected to the first end of the load X.

[0028] In this example, a diode is provided on the line between the first end of the load X and the first end of the relay coil J1 to prevent power from flowing from the first end of the load X to the first end of the relay coil J1.

[0029] The working principle of this embodiment is:

[0030] 1. When battery E1 generates electricity normally, the solar cell converts solar energy into electrical energy, and outputs electrical energy to charge battery E2. At this time, the voltage of potentiometer RP1 is the voltage of battery E2. The voltage is low, which makes the reference electrode voltage of controllable precision voltage regulator D2 low, and the negative electrode output voltage of controllable precision voltage regulator D2 is high, so that transistor V1 is not turned on, there is no power input at the input end of voltage regulator U1, voltage regulator U1 has no output, relay coil J1 is not energized, switches S1 and S2 are turned on, and battery E1 charges battery E2 while supplying power to load X through switch S2.

[0031] 2. After the battery E2 is charged and the voltage rises to the rated voltage, the voltage of the potentiometer RP1 is relatively large, which makes the reference voltage of the controllable precision voltage regulator D2 relatively low, and the negative voltage of the controllable precision voltage regulator D2 is relatively small, so that the transistor V1 is turned on and the output voltage is sent to the voltage regulator U1 (7805). The voltage regulator U1 outputs a stable voltage for the load. At this time, the relay coil J1 is energized and the switch S1 pops open to prevent the battery E2 from being overcharged and damaged.

[0032] After the switch S1 is disconnected, the potentiometer RP1 is connected to the battery E1 to collect the voltage of the battery E1. When the battery E1 generates electricity normally, the voltage of the battery E1 is greater than the rated voltage of the battery E2, the transistor V1 continues to be turned on, and the voltage regulator U1 continues to output a stable voltage to supply power to the load X, etc.

[0033] 3. When the solar cell is in a dark environment, the output voltage of battery E1 is low. At this time, transistor V1 is not conducting, relay coil J1 stops working, switches S1 and S2 are closed, and battery E1 supplies power to load X through switches S1 and S2.

[0034] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A photovoltaic intelligent power supply system, characterized in that: include: A power module comprises a solar cell and a power storage unit, wherein the power storage unit is connected in series with a switch S1 and then connected in parallel with the solar cell; A voltage stabilizing module, an input end of which is connected to the power supply module via a switch module; A sampling control module, connected to both ends of the series circuit of the power storage unit and the switch S1, and connected to the switch module, for performing voltage sampling, and controlling the switch module to conduct after the sampled voltage reaches a preset voltage; A relay, comprising a relay coil J1 and the switch S1 and a switch S2, wherein the relay coil J1 is connected to the output end of the voltage stabilizing module, and when the relay coil J1 is energized, the switches S1 and S2 are controlled to be disconnected; The load X is connected to the output end of the voltage stabilizing module and is connected to the power storage unit via the switch S2.

2. The photovoltaic intelligent power supply system according to claim 1, characterized in that: The sampling control module comprises: A sampling circuit, connected to both ends of the series circuit of the power storage unit and the switch S1, for performing voltage sampling; A controllable precision voltage-stabilizing source D2 has a reference electrode connected to the sampling circuit and a negative electrode connected to the control end of the switch module.

3. The photovoltaic intelligent power supply system according to claim 2, characterized in that: The sampling circuit has a potentiometer RP1, two ends of which are respectively connected to two ends of a series circuit of the power storage unit and the switch S1, and a middle end of the potentiometer RP1 is connected to a reference electrode of the controllable precision voltage stabilizing source D2.

4. The photovoltaic intelligent power supply system according to claim 2, characterized in that: The switch module adopts a transistor V1, the emitter and collector of the transistor V1 are respectively connected to the power module and the voltage stabilizing module, and the base of the transistor V1 is connected to the negative electrode of the controllable precision voltage stabilizing source D2.

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