Power supply control device and method of photovoltaic power supply, photovoltaic energy storage system and air conditioner

Abstract

The invention discloses a power supply control device and method for a photovoltaic power source, a photovoltaic energy storage system and a photovoltaic air conditioner, and the device comprises a first control switch unit which is switched off when the output voltage of the photovoltaic power source is smaller than a preset voltage threshold value, and a second control switch unit which is switched off when the output voltage of the photovoltaic power source is smaller than the preset voltage threshold value; a connection path between the photovoltaic power supply and the load of the photovoltaic electric equipment is disconnected; and when the output voltage of the photovoltaic power supply is greater than or equal to a preset voltage threshold value, the first control switch unit is switched on so as to switch on a connection path between the photovoltaic power supply and the load of the photovoltaic electric equipment. According to the scheme, the connection path between the photovoltaic power supply and the load is disconnected when the output voltage of the photovoltaic power supply is insufficient, so that frequent power failure and restart of the load are avoided, and the connection path between the photovoltaic power supply and the load is connected when the output voltage of the photovoltaic power supply is sufficient, so that reliable power supply of the photovoltaic power supply is ensured; and the operation stability and the service life of the photovoltaic electric equipment can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic power supplies, and specifically relates to a power supply control device and method of a photovoltaic power supply, a photovoltaic energy storage system and a photovoltaic air conditioner, and more particularly to a power supply control circuit and method of a photovoltaic power supply for a photovoltaic energy storage air conditioner, a photovoltaic energy storage system and a photovoltaic air conditioner. Background Art

[0002] As one of the most convenient new energy sources, photovoltaics have gradually entered thousands of households, and photovoltaic energy storage systems have also become an option for providing electricity for photovoltaic electrical equipment (such as household appliances). The control scheme of the photovoltaic energy storage system in the relevant scheme is generally that the output voltage of the photovoltaic module passes through a DCDC converter (DC-to-DC converter, DC-DC converter, DC-DC converter) with maximum power point tracking (Maximum power point tracking, MPPT) function to convert the photovoltaic voltage into a DC bus voltage, and the DC bus voltage supplies power to the DC load. However, the characteristics of the photovoltaic power supply cause its power supply capacity to be drastically reduced when the light source is insufficient. The DC bus voltage will be greatly reduced during operation, resulting in frequent power failure and restart of the load, affecting the operating stability and service life of the photovoltaic electrical equipment.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a power supply control device and method for a photovoltaic power source, a photovoltaic energy storage system and a photovoltaic air conditioner, so as to solve the problem that when the photovoltaic power source is insufficient, the DC bus voltage of the photovoltaic power source is greatly reduced, resulting in frequent power failures and restarts of the load, affecting the operating stability and service life of the photovoltaic power equipment. The invention achieves the effect of avoiding frequent power failures and restarts of the load by disconnecting the connection path between the photovoltaic power source and the load when the output voltage of the photovoltaic power source is insufficient, and connecting the connection path between the photovoltaic power source and the load when the output voltage of the photovoltaic power source is sufficient to ensure reliable power supply of the photovoltaic power source, which is beneficial to improving the operating stability and service life of the photovoltaic power equipment.

[0005] The present invention provides a power supply control device for a photovoltaic power source, which is arranged between the output end of the photovoltaic power source and the power consumption end of the load of the photovoltaic power-consuming device; the power supply control device for the photovoltaic power source comprises: a protection unit, a power-on switch unit, and a first control switch unit; the switch end of the power-on switch unit is a normally closed switch end, and the first control switch unit is a normally open switch end; wherein, the output end of the photovoltaic power source is connected to the switch end of the first control switch unit after passing through the protection unit; the switch end of the first control switch unit is connected to the power consumption end of the load of the photovoltaic power-consuming device; the output end of the photovoltaic power source is connected to the control end of the first control switch unit after passing through the protection unit and also through the switch end of the power-on switch unit; the first control switch unit is used to disconnect the first control switch unit itself when the output voltage of the photovoltaic power source is less than a preset voltage threshold, so as to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device; and, when the output voltage of the photovoltaic power source is greater than or equal to the preset voltage threshold, connect the first control switch unit itself to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device.

[0006] In some embodiments, it also includes: an anti-reverse connection diode unit; wherein the positive pole of the output end of the photovoltaic power supply is connected to the anode of the anti-reverse connection diode unit after passing through the protection unit; the cathode of the anti-reverse connection diode unit is connected to the switch end of the first control switch unit; the cathode of the anti-reverse connection diode unit is also connected to the first connection end of the control end of the first control switch unit after passing through the switch end of the power-on switch unit, and the second connection end of the control end of the first control switch unit is connected to the negative pole of the output end of the photovoltaic power supply; the negative pole of the output end of the photovoltaic power supply is connected to the positive pole of the power consumption end of the load of the photovoltaic power-consuming equipment.

[0007] In some embodiments, it further includes: a sampling unit; the sampling unit is arranged between the switch end of the power-on switch unit and the control end of the first control switch unit; wherein the sampling unit is used to sample the output voltage of the photovoltaic power supply from between the switch end of the power-on switch unit and the control end of the first control switch unit to obtain the sampled voltage of the photovoltaic power supply; the first control switch unit disconnects the first control switch unit itself when the output voltage of the photovoltaic power supply is less than a preset voltage threshold, including: the first control switch unit is also used to disconnect the first control switch unit itself when the sampled voltage of the photovoltaic power supply is less than the pull-in voltage of the first control switch unit; the first control switch unit connects the first control switch unit itself when the output voltage of the photovoltaic power supply is greater than or equal to the preset voltage threshold, including: the first control switch unit is also used to connect the first control switch unit itself when the sampled voltage of the photovoltaic power supply is greater than or equal to the pull-in voltage of the first control switch unit, so as to connect the connection path between the photovoltaic power supply and the load of the photovoltaic power-consuming equipment.

[0008] In some embodiments, the sampling unit includes: a first voltage-dividing resistor module and a second voltage-dividing resistor module; wherein the switch end of the power-on switch unit is connected to the negative pole of the output end of the photovoltaic power source through the first voltage-dividing resistor module and the second voltage-dividing resistor module; the common end of the first voltage-dividing resistor module and the second voltage-dividing resistor module serves as a sampling point of the sampling unit and is connected to the first connection end of the control end of the first control switch unit.

[0009] In some embodiments, the load of the photovoltaic power device includes a switching power supply unit and a main control unit; when the connection path between the photovoltaic power supply and the load of the photovoltaic power device is connected, the switching power supply unit is powered to enable the main control unit to be powered; the power supply control device of the photovoltaic power supply further includes: a second control switch unit, the switch end of the second control switch unit is a normally open switch end; wherein the positive pole of the output end of the photovoltaic power supply is connected to the power end of the load of the photovoltaic power device after passing through the switch end of the second control switch unit; the main control unit is used to send a first control signal and a second control signal at a set time interval under the power supply of the switching power supply unit when the connection path between the photovoltaic power supply and the load of the photovoltaic power device is connected; the first control signal is used to energize the control end of the second control switch unit to control the switch end of the second control switch unit to close, so as to connect the connection path between the photovoltaic power supply and the load of the photovoltaic power device; the second control signal is used to energize the control end of the power-on switch unit to control the switch end of the power-on switch unit to disconnect, so as to disconnect the connection path between the photovoltaic power supply and the load of the photovoltaic power device.

[0010] In some embodiments, the second control switch unit includes: a first relay; the power-on switch unit includes: a second relay; the first control switch unit includes: a third relay; wherein the first relay has a coil and a contact, the coil of the first relay serves as the control end of the second control switch unit, and the contact of the first relay serves as the switch end of the second control switch unit; the first connection end of the coil of the first relay is used to receive the first control signal, and the second connection end of the coil of the first relay is connected to a preset DC power supply; the second relay has a coil and a contact, the coil of the second relay serves as the control end of the power-on switch unit, and the contact of the second relay serves as the switch end of the power-on switch unit; the contact of the second relay has A first connection end, a second connection end and a third connection end, the first connection end of the contact of the second relay is always connected to the second connection end, the first connection end of the contact of the second relay can be connected to the positive pole of the output end of the photovoltaic power supply, the second connection end of the contact of the second relay is connected to the first connection end of the coil of the third relay after passing through the sampling unit, and the third connection end of the contact of the second relay is suspended; the third relay has a coil and a contact, the coil of the third relay serves as the control end of the first control switch unit, and the contact of the third relay serves as the switch end of the first control switch unit; the first connection end of the coil of the third relay is connected to the sampling point of the sampling unit, and the second connection end of the coil of the third relay is connected to the negative pole of the output end of the photovoltaic power supply.

[0011] In some embodiments, the second control switch unit also includes: a first diode module; the power-on switch unit includes: a second diode module; the first control switch unit includes: a third diode module; wherein the anode of the first diode module is connected to the first connection end of the coil of the first relay; the cathode of the first diode module is connected to the second connection end of the coil of the first relay; the anode of the second diode module is connected to the first connection end of the coil of the second relay; the cathode of the second diode module is connected to the second connection end of the coil of the second relay; the cathode of the third diode module is connected to the first connection end of the coil of the third relay; and the anode of the third diode module is connected to the second connection end of the coil of the third relay.

[0012] Matching the above-mentioned device, the present invention further provides a photovoltaic energy storage system on the other hand, including: the power supply control device of the photovoltaic power source mentioned above.

[0013] Matching the above-mentioned device, the present invention further provides a photovoltaic air conditioner on the other hand, including: the power supply control device of the photovoltaic power source mentioned above, or the photovoltaic energy storage system mentioned above.

[0014] Matching the above photovoltaic air conditioner, the present invention provides a power supply control method for a photovoltaic power source on another aspect, comprising: through the first control switch unit, when the output voltage of the photovoltaic power source is less than a preset voltage threshold, the first control switch unit itself is disconnected to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power device; and when the output voltage of the photovoltaic power source is greater than or equal to the preset voltage threshold, the first control switch unit itself is connected to connect the connection path between the photovoltaic power source and the load of the photovoltaic power device; when the power supply control device of the photovoltaic power source further includes a second control switch unit, when the connection path between the photovoltaic power source and the load of the photovoltaic power device is connected, a first control signal and a second control signal are sent at set time intervals; through the first control signal, the control end of the second control switch unit is energized to control the switch end of the second control switch unit to close to connect the connection path between the photovoltaic power source and the load of the photovoltaic power device; through the second control signal, the control end of the power-on switch unit is energized to control the switch end of the power-on switch unit to disconnect to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power device.

[0015] Therefore, the scheme of the present invention is aimed at the photovoltaic side power supply of photovoltaic power-consuming equipment (such as photovoltaic air conditioners), and a power supply control circuit is set between the photovoltaic power supply and the control part of the load of the photovoltaic power-consuming equipment. The power supply control circuit includes a protection unit (such as a resistor R) arranged between the output side of the photovoltaic power supply and the power consumption end of the load, a power-on switch unit (such as a relay K2), and a first control switch unit (such as a relay K3); the first control switch unit is a normally open switch unit, and the power-on switch unit is a normally closed switch unit. When the output voltage of the photovoltaic power supply is less than a preset voltage threshold, the first control switch unit is disconnected to disconnect the connection path between the photovoltaic power supply and the load, and when the output voltage of the photovoltaic power supply is greater than or equal to the preset voltage threshold, the first control switch unit is closed to connect the connection path between the photovoltaic power supply and the load; thereby, frequent power failure and restart of the load are avoided by disconnecting the connection path between the photovoltaic power supply and the load when the output voltage of the photovoltaic power supply is insufficient, and connecting the connection path between the photovoltaic power supply and the load when the output voltage of the photovoltaic power supply is sufficient to ensure reliable power supply of the photovoltaic power supply, which is conducive to improving the operating stability and service life of the photovoltaic power supply.

[0016] Furthermore, the power supply control circuit includes a second control switch unit (such as a relay K1) arranged between the output side of the photovoltaic power source and the power consumption end of the load, and a protection unit (such as a resistor R) arranged between the output side of the photovoltaic power source and the power consumption end of the load, a power-on switch unit (such as a relay K2), a sampling unit (such as a resistor R1 and a resistor R2), and a first control switch unit (such as a relay K3); the second control switch unit and the first control switch unit are both normally open switch units, the power-on switch unit is a normally closed switch unit, and the voltage sampled by the sampling unit is less than or equal to the pull-in voltage of the first control switch unit (such as the pull-in voltage V of the relay K3). K ) when the first control switch unit is disconnected to disconnect the connection path between the photovoltaic power source and the load, and when the voltage sampled by the sampling unit is greater than the pull-in voltage of the first control switch unit (such as the pull-in voltage V K ), the first control switch unit is closed to connect the connection path between the photovoltaic power source and the load, and the control part in the load controls the second control switch unit to close and then controls the power switch unit to disconnect after being energized; thereby, by disconnecting the connection path between the photovoltaic power source and the load when the output voltage of the photovoltaic power source is insufficient, frequent power failure and restart of the load can be avoided, and the connection path between the photovoltaic power source and the load can be connected when the output voltage of the photovoltaic power source is sufficient to ensure reliable power supply of the photovoltaic power source, which is beneficial to improving the operating stability and service life of photovoltaic power equipment.

[0017] Other features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the present invention.

[0018] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of a power supply control device of a photovoltaic power source of the present invention;

[0020] Figure 2 A schematic structural diagram of an embodiment of a power supply control circuit of a photovoltaic power source for a photovoltaic air conditioner (i.e., a photovoltaic energy storage air conditioner);

[0021] Figure 3 It is a flow chart of an embodiment of a power supply control method of a photovoltaic power source of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Considering that the DC bus voltage of the photovoltaic power supply is greatly reduced when the photovoltaic power is insufficient, the load frequently loses power and restarts, affecting the operating stability and service life of the photovoltaic power equipment. For example, when the photovoltaic power equipment is a photovoltaic air conditioner, the power supply capacity of the photovoltaic air conditioner will be greatly reduced when the light source is insufficient, and the DC bus voltage will be greatly reduced during operation, which may even cause the switching power supply to frequently enter low-voltage protection and restart, causing chips and other components to be impacted, and the air conditioning unit cannot operate stably, affecting the life of the air conditioning unit.

[0024] Specifically, photovoltaic air conditioners are products that can provide the comfort of conventional air conditioners without connecting to the mains or paying electricity bills. They are highly dependent on the power supply capacity of photovoltaic power sources. However, in the early morning or evening, the output capacity of the photovoltaic power source is insufficient, and the photovoltaic DC bus voltage will be greatly reduced during output, causing loads such as switching power supplies to frequently enter low-voltage protection. However, when the back-end load enters protection and no longer works, the photovoltaic power DC bus voltage will gradually rise and recover, and loads such as switching power supplies will also resume and restart, causing chips and other components to be frequently impacted, and the air conditioning unit cannot operate stably, seriously affecting the life of the unit.

[0025] At the same time, when the unit is powered on, the load (such as the indoor and outdoor unit switching power supply of the photovoltaic air conditioner) starts, and the indoor unit buzzer will immediately emit a "beep" prompt sound to indicate that the unit has been powered on. Due to the frequent power failure and restart of the switching power supply, the buzzer frequently emits "beep" noises, which seriously affects the user experience.

[0026] Therefore, the solution of the present invention proposes a power supply control device for a photovoltaic power source, specifically a power supply control circuit for a photovoltaic power source used for a photovoltaic energy storage air conditioner. When the output power of the photovoltaic power source is small, the load is cut off to avoid frequent power failure and restart of the load. When the output power of the photovoltaic power source is large, the load can be directly connected without additional control, thereby ensuring the stable operation of the photovoltaic power equipment when the photovoltaic power source can supply power normally, which is beneficial to extending the service life of the photovoltaic power equipment and improving the user experience.

[0027] According to an embodiment of the present invention, a photovoltaic power supply control device is provided. Figure 1 The schematic diagram of the structure of an embodiment of the device of the present invention is shown in FIG. The power supply control device of the photovoltaic power source is arranged between the output end of the photovoltaic power source and the power consumption end of the load of the photovoltaic power consumption equipment. In the scheme of the present invention, Figure 1 As shown, the photovoltaic power supply control device includes: a protection unit (such as Figure 2 The resistance R shown), the power-on switch unit (such as Figure 2 The relay K2 shown in FIG. Figure 2 The relay K3 shown in the figure); the switch end of the power-on switch unit is a normally closed switch end, and the first control switch unit is a normally open switch end.

[0028] The output end of the photovoltaic power source is connected to the switch end of the first control switch unit after passing through the protection unit; the switch end of the first control switch unit is connected to the power end of the load of the photovoltaic power-consuming device. The output end of the photovoltaic power source is connected to the control end of the first control switch unit after passing through the protection unit and the switch end of the power-on switch unit.

[0029] Specifically, the positive pole of the output end of the photovoltaic power source is connected to the switch end of the first control switch unit (such as the contact of the relay K3) after passing through the protection unit; the switch end of the first control switch unit is connected to the positive pole of the power end of the load of the photovoltaic power device; the negative pole of the output end of the photovoltaic power source is connected to the positive pole of the power end of the load of the photovoltaic power device. The positive pole of the output end of the photovoltaic power source is connected to the first connection end of the control end of the first control switch unit after passing through the protection unit and the switch end of the power-on switch unit, and the second connection end of the control end of the first control switch unit is connected to the negative pole of the output end of the photovoltaic power source; the negative pole of the output end of the photovoltaic power source is connected to the positive pole of the power end of the load of the photovoltaic power device. The switch end of the power-on switch unit is such as the normally-on port of the relay K2.

[0030] The first control switch unit is used to disconnect the first control switch unit itself when the output voltage of the photovoltaic power source is less than a preset voltage threshold, so as to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device. And,

[0031] The first control switch unit is also used to switch on the first control switch unit itself when the output voltage of the photovoltaic power source is greater than or equal to a preset voltage threshold, so as to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming equipment.

[0032] The solution of the present invention proposes a power supply control circuit of a photovoltaic power source for a photovoltaic energy storage air conditioner, which cuts off the load when the output power of the photovoltaic power source is small to avoid frequent power failure and restart of the load, and directly connects the load without additional control when the output power of the photovoltaic power source is large, thereby ensuring stable operation of the photovoltaic power-consuming equipment when the photovoltaic power source can supply power normally, which is beneficial to extending the service life of the photovoltaic power-consuming equipment and improving user experience.

[0033] In some embodiments, the photovoltaic power supply control device of the present invention further includes: an anti-reverse connection diode unit, such as Figure 2 The reverse connection protection diode D is shown.

[0034] The positive pole of the output end of the photovoltaic power source is connected to the anode of the anti-reverse connection diode unit after passing through the protection unit; the cathode of the anti-reverse connection diode unit is connected to the switch end of the first control switch unit (such as the contact of the relay K3). The cathode of the anti-reverse connection diode unit is also connected to the first connection end of the control end of the first control switch unit after passing through the switch end of the power-on switch unit, and the second connection end of the control end of the first control switch unit is connected to the negative pole of the output end of the photovoltaic power source; the negative pole of the output end of the photovoltaic power source is connected to the positive pole of the power consumption end of the load of the photovoltaic power-consuming device (such as the switch of the relay K3).

[0035] In the solution of the present invention, after the output end of the photovoltaic power source is current limited by a protection unit such as a resistor R, an anti-reverse connection diode such as a diode D is used to prevent reverse connection, which can ensure the unidirectional flow of the output voltage of the photovoltaic power source and improve the power-on safety.

[0036] In some embodiments, the photovoltaic power supply control device described in the solution of the present invention further includes: a sampling unit (such as Figure 2 The resistor R1 and the resistor R2 shown in the figure); the sampling unit is arranged between the switch end of the power switch unit and the control end of the first control switch unit.

[0037] Wherein, the sampling unit is used to sample the output voltage of the photovoltaic power supply between the switch end of the power-on switch unit and the control end of the first control switch unit to obtain the sampled voltage of the photovoltaic power supply when the output voltage of the photovoltaic power supply reaches the sampling unit via the protection unit and the switch end of the power-on switch unit.

[0038] The first control switch unit is used to disconnect the first control switch unit itself when the output voltage of the photovoltaic power supply is less than a preset voltage threshold, including: the first control switch unit is also used to disconnect the first control switch unit itself when the sampling voltage of the photovoltaic power supply is less than the pull-in voltage of the first control switch unit.

[0039] The first control switch unit, which turns on the first control switch unit itself when the output voltage of the photovoltaic power supply is greater than or equal to a preset voltage threshold, includes: the first control switch unit is also used for the first control switch unit, which is also used for turning on the first control switch unit itself when the sampling voltage of the photovoltaic power supply is greater than or equal to the pull-in voltage of the first control switch unit, so as to connect the connection path between the photovoltaic power supply and the load of the photovoltaic power-consuming equipment.

[0040] In the solution of the present invention, a sampling unit is set between the power-on switch unit such as relay K2 and the first control switch unit such as relay K3, and the sampling voltage can be obtained by dividing the voltage with the coil resistance of relay K3, so that relay K3 can be reliably connected or disconnected based on the sampling voltage, thereby improving the reliability of the contact on-off control of relay K3.

[0041] In some embodiments, the sampling unit includes: a first voltage-dividing resistor module (such as Figure 2 The resistor R1 shown in FIG. 1 ), and the second voltage-dividing resistor module (such as Figure 2 The resistor R2 is shown).

[0042] Among them, the switch end of the power-on switch unit is connected to the negative electrode of the output end of the photovoltaic power supply after passing through the first voltage-dividing resistor module and the second voltage-dividing resistor module; the common end of the first voltage-dividing resistor module and the second voltage-dividing resistor module is connected to the first connection end of the control end of the first control switch unit as the sampling point of the sampling unit.

[0043] In the scheme of the present invention, by dividing the voltage through the parallel resistance of the first voltage-dividing resistor module such as resistor R1, and the second voltage-dividing resistor module such as resistor R2 and the first control switch unit such as the coil resistance of relay K3, the sampling voltage can be accurately obtained, so that the relay K3 can be reliably connected or disconnected based on the sampling voltage, thereby improving the reliability of the contact on-off control of relay K3.

[0044] In some embodiments, the load of the photovoltaic power device includes a switching power supply unit (such as a switching power supply circuit in the load of a photovoltaic air conditioner) and a main control unit (such as a main chip in the load of a photovoltaic air conditioner); when the connection path between the photovoltaic power supply and the load of the photovoltaic power device is connected, the switching power supply unit is powered to enable the main control unit to be powered; the power supply control device of the photovoltaic power supply further includes: a second control switch unit (such as Figure 2 The relay K1 shown in the figure), the switch end of the second control switch unit is a normally open switch end.

[0045] The positive pole of the output end of the photovoltaic power source is connected to the power end of the load of the photovoltaic power-consuming equipment through the switch end of the second control switch unit; the switch end of the second control switch unit is such as the contact of the relay K1.

[0046] The main control unit is used to send out a first control signal and a second control signal at set time intervals when the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming equipment is connected and the switching power supply unit is powered; wherein the first control signal is such as the control signal KZ for controlling the relay K1, and the second control signal is such as the control signal KZ for controlling the relay K2.

[0047] The first control signal is used to energize the control end of the second control switch unit to control the switch end of the second control switch unit to close, so as to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device.

[0048] The second control signal is used to energize the control end of the power switch unit to control the switch end of the power switch unit to be disconnected, so as to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device.

[0049] Specifically, the photovoltaic power supply control device includes: a second control switch unit (such as Figure 2 Relay K1 shown), power switch unit (such as Figure 2 The relay K2 shown in FIG. Figure 2 Relay K3 shown), and protection unit (such as Figure 2 The resistor R shown), the sampling unit (such as Figure 2 The output end of the photovoltaic power supply is connected to the power end of the load of the photovoltaic power-consuming equipment after passing through the second control switch unit; the output end of the photovoltaic power supply is also connected to the power end of the load of the photovoltaic power-consuming equipment after passing through the protection unit, the power-on switch unit, the sampling unit and the first control switch unit; the second control switch unit and the first control switch unit are both normally open switch units, and the switch end of the power-on switch unit is a normally closed switch end.

[0050] The sampling unit is used to sample the output voltage of the photovoltaic power supply between the switch end of the power switch unit and the control end of the first control switch unit to obtain the sampled voltage of the photovoltaic power supply when the output voltage of the photovoltaic power supply reaches the sampling unit via the protection unit and the switch end of the power switch unit.

[0051] The first control switch unit is used to disconnect the first control switch unit itself when the sampling voltage of the photovoltaic power source is less than the pull-in voltage of the first control switch unit, so as to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device; and

[0052] The first control switch unit is also used for the first control switch unit, and is also used to turn on the first control switch unit itself when the sampling voltage of the photovoltaic power source is greater than or equal to the pull-in voltage of the first control switch unit, so as to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device; when the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device is connected, the switch power supply unit is powered on to enable the main control unit to be powered on;

[0053] The main control unit is used to send a first control signal and a second control signal under the power supply of the switching power supply unit when the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device is connected, so as to control the power-on switch unit to be disconnected after the second control switch unit is connected. The first control signal is such as the control signal KZ for controlling the relay K1, and the second control signal is such as the control signal KZ for controlling the relay K2.

[0054] When the output power of the photovoltaic power supply is insufficient, it cannot stably supply power to the load, resulting in frequent power failures and restarts of the load (such as the switch power supply of the indoor and outdoor units of the photovoltaic air conditioner). Also, in the early morning and evening, when the output power of the photovoltaic power supply is insufficient, the load (such as the switch power supply of the indoor and outdoor units of the photovoltaic air conditioner) frequently restarts, causing the buzzer to frequently emit a "beep" noise, which greatly affects the user experience. The solution of the present invention cuts off the load when the output power of the photovoltaic power supply is low, avoiding frequent power failures and restarts of the load, which is conducive to extending the service life of photovoltaic electrical equipment and improving user experience.

[0055] In some embodiments, the second control switch unit includes: a first relay (such as relay K1); the power switch unit includes: a second relay (such as relay K2); the first control switch unit includes: a third relay (such as relay K3).

[0056] Wherein, the first relay has a coil and a contact, the coil of the first relay serves as the control end of the second control switch unit, and the contact of the first relay serves as the switch end of the second control switch unit; the first connection end of the coil of the first relay is used to receive the first control signal, and the second connection end of the coil of the first relay is connected to a preset DC power supply; wherein, the preset DC power supply is such as a 12V power supply.

[0057] The second relay has a coil and a contact, the coil of the second relay serves as the control end of the power-on switch unit, and the contact of the second relay serves as the switch end of the power-on switch unit; the contact of the second relay has a first connection end, a second connection end and a third connection end, the first connection end of the contact of the second relay is always connected to the second connection end, the first connection end of the contact of the second relay can be connected to the positive pole of the output end of the photovoltaic power supply, the second connection end of the contact of the second relay is connected to the first connection end of the coil of the third relay after passing through the sampling unit, and the third connection end of the contact of the second relay is suspended.

[0058] The third relay has a coil and a contact, the coil of the third relay serves as the control end of the first control switch unit, and the contact of the third relay serves as the switch end of the first control switch unit; the first connection end of the coil of the third relay is connected to the sampling point of the sampling unit, and the second connection end of the coil of the third relay is connected to the negative pole of the output end of the photovoltaic power supply.

[0059] Figure 2 A schematic diagram of a photovoltaic power supply control circuit for a photovoltaic air conditioner (i.e., photovoltaic energy storage air conditioner) according to an embodiment of the present invention. Figure 2 In the figure, K1, K2, and K3 are all relays; relay K2 is a normally-on relay, and port ① of relay K2 is normally on, and port ② of relay K2 is normally off. Resistor R is a protective resistor, and resistors R1 and R2 are both voltage-dividing resistors; diode D is an anti-reverse diode; Vin is the input voltage of photovoltaic DC power, that is, the output voltage of photovoltaic power supply; voltage V A is the voltage at point A where resistors R1 and R2 are connected, that is, the voltage across resistor R2. Figure 2 As shown, the power supply control circuit of the photovoltaic power source used for the photovoltaic air conditioner includes: a relay K1, a relay K2, a relay K3, a resistor R, a resistor R1, a resistor R2, and a diode D.

[0060] The output voltage of the photovoltaic module is used as the output voltage of the photovoltaic power source, that is, the input voltage Vin of the power supply control circuit of the photovoltaic air conditioner. The positive pole of the output voltage of the photovoltaic power source is connected to the positive pole of the power consumption end of the load through the contact of the relay K1; the negative pole of the output voltage of the photovoltaic power source is connected to the negative pole of the power consumption end of the load. The first connection end of the coil of the relay K1 is used to receive the control signal KZ sent by the main chip; the second connection end of the coil of the relay K1 is connected to the 12V DC power supply.

[0061] The positive pole of the output voltage of the photovoltaic power source is also connected to the anode of the diode D through the resistor R; the cathode of the diode D is connected to the first connection end of the contact of the relay K2, the second connection end of the contact of the relay K2 (i.e., the ① port of the relay K2) is connected to the negative pole of the power consumption end of the load through the resistors R1 and R2, and the third connection end of the contact of the relay K2 (i.e., the ② port of the relay K2) is suspended. The first connection end of the coil of the relay K2 is used to receive the control signal KZ sent by the main chip; the second connection end of the coil of the relay K2 is connected to the 12V DC power supply.

[0062] The cathode of the diode D is also connected to the positive electrode of the power consumption end of the load through the contact of the relay K3; the resistor R1 is connected in parallel with the coil of the relay K3, and the connection end of the resistor R1 and the resistor R2 is point A. The first connection end of the coil of the relay K3 is connected to point A, and the second connection end of the coil of the relay K3 is connected to the negative electrode of the power consumption end of the load.

[0063] exist Figure 2 In the example shown, a voltage-dividing resistor (such as resistor R1 and resistor R2), as well as relay K1 and relay K2 are added, so that when the voltage of the photovoltaic power source is insufficient or in a critical state, the voltage divided by the voltage-dividing resistor (such as resistor R1 and resistor R2) is insufficient, and the load at the rear end of relay K3 is disconnected and not connected to the photovoltaic power source. In this way, the load is automatically disconnected in the critical state of insufficient voltage of the photovoltaic power source to avoid frequent start and stop of the load; and the load is automatically connected when the photovoltaic power is sufficient, so that the load can normally use the photovoltaic power source as a power supply. Among them, when the load is disconnected from the photovoltaic power source, the load can normally use the mains or battery as a power supply to ensure the stable operation of the load.

[0064] See also Figure 2 In the example shown, the photovoltaic DC input voltage V in , through the resistor R, the anti-reverse connection diode D, and the normally open port of relay K2, i.e., port ① of relay K2, through the resistor R1, and the parallel resistor R of the resistor R2 and the internal coil resistance of relay K3 并 After voltage division, the voltage V at point A is obtained A When the voltage V at point A where resistors R1 and R2 are connected A Reach the pull-in voltage V of relay K3 K When the load at the rear end of relay K3 is powered, relay K3 is energized, and the photovoltaic power supply will simultaneously supply power to the load at the rear end of relay K3. After the load at the rear end of relay K3 is powered, the switch power supply and other circuits in the load start to work, and the main chip in the load sends a control signal KZ, first controlling relay K1 to conduct, so that the load is powered directly from the photovoltaic power supply through relay K1, and then controlling relay K2 to disconnect, so that the current provided by the photovoltaic power supply no longer passes through relay K2 and relay K3, so as to appropriately save the power consumption of the photovoltaic power supply.

[0065] join Figure 2 In the example shown, the rated output voltage of the photovoltaic power source is known to be V IN , the forward voltage drop of the reverse connection protection diode D is V D , the pull-in voltage of relay K3 is V K , the coil resistance of relay K3 is R K , the resistance value of resistor R1 is R1, and the resistance value of resistor R2 is R2. K In parallel, the resistor R2 and the resistor R K The parallel resistance R 并 =(R2*R K ) / (R2+R K ). Connect resistor R1 and resistor R 并 The voltage divider value is set to R 并 / (R1+R+R 并 )=V K / (V IN -V D ), that is, (R1+R) / R 并 =(V IN -V K -V D ) / V K .

[0066] When the output capacity of the photovoltaic power supply is insufficient, the photovoltaic DC bus voltage will be pulled down. Because the voltage across the resistor R2, that is, the voltage at point A V A =((V in -V D )*R 并 ) / (R+R1+R 并 ), so when the photovoltaic DC input voltage V in When the voltage at point A decreases, V A When the voltage V A Less than the pull-in voltage V of relay K3 K When the photovoltaic power is insufficient or in a critical state, since the voltage across resistor R2 in the voltage divider circuit composed of resistors R1 and R2 cannot reach the pull-in voltage of relay K3, relay K3 will not be pulled in, and the load at the rear end of relay K3 will be automatically disconnected and not connected to the photovoltaic power supply, so as to avoid the rear end load using electricity when the photovoltaic power supply is insufficient or in a critical state, which will greatly reduce the photovoltaic power supply voltage and cause power outage. After the photovoltaic power supply voltage is restored after the power outage, it will be powered again, thus causing frequent start and stop.

[0067] When the output capacity of the photovoltaic power supply is sufficient, the photovoltaic DC bus voltage will be greater than or equal to the rated output voltage, then the voltage at point A V A Greater than or equal to the pull-in voltage V of relay K3 K , the relay K3 is energized, the load at the rear end of the relay K3 is powered, and the rear end circuit starts to work. In the scheme of the present invention, when the output power of the photovoltaic power source is sufficient, the load can be directly connected, reducing the control steps and complexity.

[0068] After the load is powered on, the switch power circuit and the main chip in the load start working. The main chip sends a control signal KZ, first controlling relay K1 to conduct, so that the load is powered directly from the photovoltaic power source, and then controlling relay K2 to disconnect, so that the current of the photovoltaic power source no longer passes through relay K2 and relay K3. After the load at the rear end of relay K3 is powered, relay K1 is controlled to conduct, so that the current no longer passes through relay K2 and relay K3, reducing power loss.

[0069] The above is a circuit and control method for realizing automatic disconnection of the photovoltaic energy storage air conditioner when the output capacity of the photovoltaic power source is insufficient, and automatic connection when the output capacity of the photovoltaic power source is sufficient. This can avoid frequent protection shutdown of the photovoltaic air conditioner when the output capacity of the photovoltaic power source is insufficient, thereby extending the life of the unit.

[0070] In the scheme of the present invention, the photovoltaic air conditioner is operated at a limited frequency: the real-time output power of the photovoltaic power source is detected through a low-power charging mode, and this is used as the air conditioner operation frequency limit to ensure stable operation of the air conditioner; when the photovoltaic power supply output is insufficient: the real-time output power of the photovoltaic power source is detected through a low-power charging mode, the operating power of the air conditioner is controlled to match the output power of the photovoltaic power source, and the photovoltaic power source is utilized to the maximum extent.

[0071] The solution of the present invention provides a power supply control circuit for a photovoltaic power source for a photovoltaic energy storage air conditioner, which can automatically disconnect the load under a critical state of insufficient photovoltaic power to avoid frequent start and shutdown of the load; and automatically connect the load when the photovoltaic power is sufficient. Compared with the related solutions that require an adjustable load and a complex control circuit to test the actual output power of the photovoltaic power source to achieve switch control of the load under a critical state of insufficient photovoltaic power, the solution of the present invention has lower cost and does not require a complex control method.

[0072] In some embodiments, the second control switch unit further includes: a first diode module (such as diode D1); the power-on switch unit includes: a second diode module (such as diode D2); the first control switch unit includes: a third diode module (such as diode D3).

[0073] The anode of the first diode module is connected to the first connection end of the coil of the first relay; the cathode of the first diode module is connected to the second connection end of the coil of the first relay.

[0074] An anode of the second diode module is connected to a first connection end of the coil of the second relay; and a cathode of the second diode module is connected to a second connection end of the coil of the second relay.

[0075] The cathode of the third diode module is connected to the first connection end of the coil of the third relay; the anode of the third diode module is connected to the second connection end of the coil of the third relay.

[0076] exist Figure 2 In the example shown, diodes D1, D2 and D3 are provided for relays K1, K2 and K3. The first connection end of the coil of relay K1 is connected to the anode of diode D1, and the second connection end of the coil of relay K1 is connected to the cathode of diode D1. The energy on the coil of relay K1 is absorbed and discharged through diode D1 to improve safety. The first connection end of the coil of relay K2 is connected to the anode of diode D2, and the second connection end of the coil of relay K2 is connected to the cathode of diode D2. The energy on the coil of relay K2 is absorbed and discharged through diode D2 to improve safety. The first connection end of the coil of relay K3 is connected to the cathode of diode D3, and the second connection end of the coil of relay K3 is connected to the anode of diode D3. The energy on the coil of relay K3 is absorbed and discharged through diode D3 to improve safety.

[0077] According to the technical solution of the present invention, a power supply control circuit is provided between a photovoltaic power source and a control part of a load of a photovoltaic power-consuming device (such as a photovoltaic air conditioner) by supplying power to the photovoltaic side of the photovoltaic power-consuming device. The power supply control circuit includes a protection unit (such as a resistor R) provided between the output side of the photovoltaic power source and the power-consuming end of the load, a power-on switch unit (such as a relay K2), and a first control switch unit (such as a relay K3); the first control switch unit is a normally open switch unit, and the power-on switch unit is a normally closed switch unit. When the output voltage of the photovoltaic power source is less than a preset voltage threshold, the first control switch unit is disconnected to disconnect the connection path between the photovoltaic power source and the load, and when the output voltage of the photovoltaic power source is greater than or equal to the preset voltage threshold, the first control switch unit is closed to connect the connection path between the photovoltaic power source and the load; thus, frequent power failure and restart of the load are avoided by disconnecting the connection path between the photovoltaic power source and the load when the output voltage of the photovoltaic power source is insufficient, and reliable power supply of the photovoltaic power source is ensured by connecting the connection path between the photovoltaic power source and the load when the output voltage of the photovoltaic power source is sufficient, which is beneficial to improving the operation stability and service life of the photovoltaic power-consuming device.

[0078] Preferably, by supplying power to the photovoltaic side of a photovoltaic power-consuming device (such as a photovoltaic air conditioner), a power supply control circuit is provided between the photovoltaic power source and the control part of the load of the photovoltaic power-consuming device, and the power supply control circuit includes a second control switch unit (such as a relay K1) provided between the output side of the photovoltaic power source and the power-consuming end of the load, and a protection unit (such as a resistor R) provided between the output side of the photovoltaic power source and the power-consuming end of the load, a power-on switch unit (such as a relay K2), a sampling unit (such as a resistor R1 and a resistor R2), and a first control switch unit (such as a relay K3); the second control switch unit and the first control switch unit are both normally open switch units, the power-on switch unit is a normally closed switch unit, and the voltage sampled by the sampling unit is less than or equal to the pull-in voltage of the first control switch unit (such as the pull-in voltage V of the relay K3). K ) when the first control switch unit is disconnected to disconnect the connection path between the photovoltaic power source and the load, and when the voltage sampled by the sampling unit is greater than the pull-in voltage of the first control switch unit (such as the pull-in voltage V K ), the first control switch unit is closed to connect the connection path between the photovoltaic power source and the load, and the control part in the load controls the second control switch unit to close and then controls the power switch unit to disconnect after being energized; thereby, by disconnecting the connection path between the photovoltaic power source and the load when the output voltage of the photovoltaic power source is insufficient, frequent power failure and restart of the load can be avoided, and the connection path between the photovoltaic power source and the load can be connected when the output voltage of the photovoltaic power source is sufficient to ensure reliable power supply of the photovoltaic power source, which is beneficial to improving the operating stability and service life of photovoltaic power equipment.

[0079] According to an embodiment of the present invention, a photovoltaic energy storage system corresponding to a power supply control device of a photovoltaic power source is also provided. The photovoltaic energy storage system may include: the power supply control device of the photovoltaic power source described above.

[0080] Since the processing and functions implemented by the photovoltaic energy storage system of this embodiment basically correspond to the embodiments, principles and examples of the device, for the details not described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0081] According to an embodiment of the present invention, a photovoltaic air conditioner corresponding to a power supply control device of a photovoltaic power source is also provided. The photovoltaic air conditioner may include: the power supply control device of the photovoltaic power source described above, or the photovoltaic energy storage system described above.

[0082] Since the processing and functions implemented by the photovoltaic air conditioner of this embodiment basically correspond to the embodiments, principles and examples of the device, for the details not described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0083] According to an embodiment of the present invention, a power supply control method for a photovoltaic power source corresponding to a photovoltaic air conditioner is also provided. Figure 3 The schematic flow chart of an embodiment of the method of the present invention is shown in FIG. The photovoltaic power supply control method may include: steps S110 to S150.

[0084] At step S110, the first control switch unit is used to disconnect itself when the output voltage of the photovoltaic power source is less than a preset voltage threshold, so as to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device. And,

[0085] In step S120, when the output voltage of the photovoltaic power source is greater than or equal to a preset voltage threshold, the first control switch unit itself is turned on to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device.

[0086] At step S130, when the power supply control device of the photovoltaic power source also includes a second control switch unit, when the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming equipment is connected, a first control signal and a second control signal are sent out at set time intervals; wherein the first control signal is such as a control signal KZ for controlling relay K1, and the second control signal is such as a control signal KZ for controlling relay K2.

[0087] In step S140, the control end of the second control switch unit is energized by the first control signal to control the switch end of the second control switch unit to close, so as to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device.

[0088] At step S150, the control end of the power switch unit is energized by the second control signal to control the switch end of the power switch unit to be disconnected, so as to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device.

[0089] Preferably, the photovoltaic power supply control device comprises: a second control switch unit (such as Figure 2 Relay K1 shown), power switch unit (such as Figure 2 The relay K2 shown in FIG. Figure 2 Relay K3 shown), protection unit (such as Figure 2 The resistor R shown), the sampling unit (such as Figure 2 The resistor R1 and the resistor R2 shown in the figure), and the anti-reverse connection diode unit (such as a diode D). The second control switch unit includes: a first relay (such as a relay K1); the power switch unit includes: a second relay (such as a relay K2); the first control switch unit includes: a third relay (such as a relay K3).

[0090] The output voltage of the photovoltaic module is used as the output voltage of the photovoltaic power source, that is, the input voltage Vin of the power supply control circuit of the photovoltaic air conditioner. The positive pole of the output voltage of the photovoltaic power source is connected to the positive pole of the power consumption end of the load through the contact of the relay K1; the negative pole of the output voltage of the photovoltaic power source is connected to the negative pole of the power consumption end of the load. The first connection end of the coil of the relay K1 is used to receive the control signal KZ sent by the main chip; the second connection end of the coil of the relay K1 is connected to the 12V DC power supply.

[0091] The positive pole of the output voltage of the photovoltaic power source is also connected to the anode of the diode D through the resistor R; the cathode of the diode D is connected to the first connection end of the contact of the relay K2, the second connection end of the contact of the relay K2 (i.e., the ① port of the relay K2) is connected to the negative pole of the power consumption end of the load through the resistors R1 and R2, and the third connection end of the contact of the relay K2 (i.e., the ② port of the relay K2) is suspended. The first connection end of the coil of the relay K2 is used to receive the control signal KZ sent by the main chip; the second connection end of the coil of the relay K2 is connected to the 12V DC power supply.

[0092] The cathode of the diode D is also connected to the positive electrode of the power consumption end of the load through the contact of the relay K3; the resistor R1 is connected in parallel with the coil of the relay K3, and the connection end of the resistor R1 and the resistor R2 is point A. The first connection end of the coil of the relay K3 is connected to point A, and the second connection end of the coil of the relay K3 is connected to the negative electrode of the power consumption end of the load.

[0093] In the scheme of the present invention, when the output power of the photovoltaic power source is small, the load is cut off to avoid frequent power failure and restart of the load. When the output power of the photovoltaic power source is large, the load can be directly connected without additional control, thereby ensuring the stable operation of the photovoltaic power equipment when the photovoltaic power source can supply power normally, which is beneficial to extending the service life of the photovoltaic power equipment and improving the user experience.

[0094] Since the processing and functions implemented by the method of this embodiment basically correspond to the embodiments, principles and examples of the aforementioned photovoltaic air conditioner, for the details not fully described in this embodiment, please refer to the relevant descriptions in the aforementioned embodiments and will not be repeated here.

[0095] In summary, it is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0096] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A photovoltaic power supply control device, characterized in that: It is arranged between the output end of the photovoltaic power source and the power consumption end of the load of the photovoltaic power-consuming equipment; the power supply control device of the photovoltaic power source includes: a protection unit, a power-on switch unit, and a first control switch unit; the switch end of the power-on switch unit is a normally closed switch end, and the first control switch unit is a normally open switch end; wherein, The output end of the photovoltaic power source is connected to the switch end of the first control switch unit after passing through the protection unit; the switch end of the first control switch unit is connected to the power consumption end of the load of the photovoltaic power consumption equipment; The output end of the photovoltaic power source is connected to the control end of the first control switch unit after passing through the protection unit and the switch end of the power switch unit; The first control switch unit is used to disconnect the first control switch unit itself when the output voltage of the photovoltaic power source is less than a preset voltage threshold, so as to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device; and When the output voltage of the photovoltaic power source is greater than or equal to a preset voltage threshold, the first control switch unit is turned on to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device.

2. The photovoltaic power supply control device according to claim 1, characterized in that: Also includes: Anti-reverse connection diode unit; wherein, The positive electrode of the output end of the photovoltaic power source is connected to the anode of the anti-reverse connection diode unit after passing through the protection unit; the cathode of the anti-reverse connection diode unit is connected to the switch end of the first control switch unit; The cathode of the anti-reverse polarity diode unit is also connected to the first connection end of the control end of the first control switch unit after passing through the switch end of the power-on switch unit, and the second connection end of the control end of the first control switch unit is connected to the negative pole of the output end of the photovoltaic power supply; the negative pole of the output end of the photovoltaic power supply is connected to the positive pole of the power consumption end of the load of the photovoltaic power-consuming equipment.

3. The photovoltaic power supply control device according to claim 1 or 2, characterized in that: Also includes: A sampling unit; the sampling unit is arranged between the switch end of the power switch unit and the control end of the first control switch unit; wherein, The sampling unit is used to sample the output voltage of the photovoltaic power source between the switch end of the power switch unit and the control end of the first control switch unit to obtain a sampled voltage of the photovoltaic power source; The first control switch unit disconnects itself when the output voltage of the photovoltaic power source is less than a preset voltage threshold, comprising: The first control switch unit is further used to disconnect the first control switch unit itself when the sampling voltage of the photovoltaic power source is less than the pull-in voltage of the first control switch unit; The first control switch unit switches on itself when the output voltage of the photovoltaic power source is greater than or equal to a preset voltage threshold, comprising: The first control switch unit is also used to switch on the first control switch unit itself when the sampling voltage of the photovoltaic power source is greater than or equal to the pull-in voltage of the first control switch unit, so as to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming equipment.

4. The photovoltaic power supply control device according to claim 3, characterized in that: The sampling unit includes: a first voltage-dividing resistor module and a second voltage-dividing resistor module; wherein, The switch end of the power-on switch unit is connected to the negative electrode of the output end of the photovoltaic power supply after passing through the first voltage-dividing resistor module and the second voltage-dividing resistor module; the common end of the first voltage-dividing resistor module and the second voltage-dividing resistor module is connected to the first connection end of the control end of the first control switch unit as a sampling point of the sampling unit.

5. The photovoltaic power supply control device according to any one of claims 1 to 4, characterized in that: The load of the photovoltaic power-consuming device includes a switching power supply unit and a main control unit; when the connection path between the photovoltaic power supply and the load of the photovoltaic power-consuming device is connected, the switching power supply unit is powered so that the main control unit is powered; The photovoltaic power supply control device further includes: a second control switch unit, wherein the switch end of the second control switch unit is a normally open switch end; wherein, The positive electrode of the output end of the photovoltaic power source is connected to the power consumption end of the load of the photovoltaic power consumption device after passing through the switch end of the second control switch unit; The main control unit is used to send a first control signal and a second control signal at set time intervals under the power supply of the switching power supply unit when the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device is connected; The first control signal is used to energize the control end of the second control switch unit to control the switch end of the second control switch unit to close, so as to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device; The second control signal is used to energize the control end of the power switch unit to control the switch end of the power switch unit to be disconnected, so as to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device.

6. The photovoltaic power supply control device according to claim 5, characterized in that: The second control switch unit includes: a first relay; the power switch unit includes: a second relay; the first control switch unit includes: a third relay; wherein, The first relay has a coil and a contact, the coil of the first relay serves as a control end of the second control switch unit, and the contact of the first relay serves as a switch end of the second control switch unit; the first connection end of the coil of the first relay is used to receive the first control signal, and the second connection end of the coil of the first relay is connected to a preset DC power supply; The second relay has a coil and a contact, the coil of the second relay serves as a control end of the power-on switch unit, and the contact of the second relay serves as a switch end of the power-on switch unit; the contact of the second relay has a first connection end, a second connection end and a third connection end, the first connection end of the contact of the second relay is always connected to the second connection end, the first connection end of the contact of the second relay can be connected to the positive electrode of the output end of the photovoltaic power source, the second connection end of the contact of the second relay is connected to the first connection end of the coil of the third relay after passing through the sampling unit, and the third connection end of the contact of the second relay is suspended; The third relay has a coil and a contact, the coil of the third relay serves as the control end of the first control switch unit, and the contact of the third relay serves as the switch end of the first control switch unit; the first connection end of the coil of the third relay is connected to the sampling point of the sampling unit, and the second connection end of the coil of the third relay is connected to the negative pole of the output end of the photovoltaic power supply.

7. The photovoltaic power supply control device according to claim 6, characterized in that: The second control switch unit further includes: a first diode module; the power switch unit includes: a second diode module; the first control switch unit includes: a third diode module; wherein, The anode of the first diode module is connected to the first connection end of the coil of the first relay; the cathode of the first diode module is connected to the second connection end of the coil of the first relay; The anode of the second diode module is connected to the first connection end of the coil of the second relay; the cathode of the second diode module is connected to the second connection end of the coil of the second relay; The cathode of the third diode module is connected to the first connection end of the coil of the third relay; the anode of the third diode module is connected to the second connection end of the coil of the third relay.

8. A photovoltaic energy storage system, characterized in that: include: A power supply control device for a photovoltaic power source as claimed in any one of claims 1 to 7.

9. A photovoltaic air conditioner, characterized in that: include: A power supply control device for a photovoltaic power source as claimed in any one of claims 1 to 7, or a photovoltaic energy storage system as claimed in claim 8.

10. A photovoltaic power supply control method corresponding to the photovoltaic power supply control device according to any one of claims 1 to 7, characterized in that: include: By means of the first control switch unit, when the output voltage of the photovoltaic power source is less than a preset voltage threshold, the first control switch unit itself is disconnected to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device; as well as, When the output voltage of the photovoltaic power source is greater than or equal to a preset voltage threshold, the first control switch unit is turned on to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device; When the power supply control device of the photovoltaic power source further includes a second control switch unit, when the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device is connected, the first control signal and the second control signal are sent at set time intervals; The control end of the second control switch unit is powered by the first control signal to control the switch end of the second control switch unit to close, so as to connect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device; The control end of the power switch unit is energized by the second control signal to control the switch end of the power switch unit to be disconnected, so as to disconnect the connection path between the photovoltaic power source and the load of the photovoltaic power-consuming device.

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