TWM512065U - Renewable energy power supply device for providing AC/AC power supply device with hybrid power - Google Patents

Description

Renewable energy supply device for supplying AC power to AC power supply

The present invention relates to a regenerative power supply device that provides a hybrid power supply for an AC-to-AC power supply device, and more particularly to an automatic power switch (ATS) that does not require the use of an electric power source, such as a solar power generation device. The regenerative power supply device and the regenerative energy supply system that the electric power is fed to the power supply system to achieve the self-use purpose and do not need to be converted multiple times.

Most of the electrical products are powered by an AC power source. For example, a single-phase AC power source of 110 V/220 V and a frequency of 60 Hertz (Hz) is usually used, or a three-phase AC power of 220 V/380 V and a frequency of 60 Hz is used. In fact, this is designed to match the power supply of the power company, because the generators of the power companies are mostly rotary generators, and their energy comes from the cycle of generating positive and negative electric cross-outputs, so the power supplied by the power company (again It is called commercial power. It is generally chosen to be supplied by means of alternating current. Further, when the alternating current appliance is a rotary machine (for example, a motor or a compressor), since the power company supplies a fixed frequency (60 Hz) alternating current, the rotation speed of the rotary machine is also fixed, and therefore, The frequency of the power supply is additionally adjusted by the frequency converter to change the speed to achieve a smooth increase or decrease in speed.

Please refer to FIG. 1 , which is a schematic diagram of an internal circuit of the conventional frequency converter 100 for explaining the working principle of the internal frequency converter 100. The frequency converter converts the alternating current power into a direct current and then exchanges power crystals to generate a frequency. Controlled AC power. As shown in FIG. 1, the AC power supplied by the power company is input through the first power terminal 101 and the second power terminal 102, and after being rectified by the single current to the rectifier 103, the first node 104 and the second node 105 at both ends of the capacitor C1. Form a constant current VDC, and then pass through The first transistor Q1, the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are combined into a commutation circuit, and a first power output terminal 106 and a second power output terminal 107 are outputted. The first power source output 106 and the first power source can be changed by adjusting the speed of the state in which the first transistor Q1 and the fourth transistor Q4 are turned on alternately to the state in which the second transistor Q2 and the third transistor Q3 are turned on. The frequency of the alternating current between the two power output terminals 107 achieves the effect of frequency conversion, and thus the purpose of controlling the motor speed can be achieved.

In other energy applications, such as solar energy, the output power of power generation equipment due to such energy is easily affected by other factors (such as weather, environmental factors, etc.) and cannot be stably supplied. Please refer to Figure 2 to solve the above problems. The development of the commercial parallel power solar power system 200 is shown in FIG. 2, which is a schematic diagram of a conventional commercial parallel power solar power system 200. The direct current generated by the solar power generating device 202 is first converted into an alternating current through a commercial parallel converter 201. Thereafter, the mains grid 203 is incorporated, and the frequency of the alternating current input from the mains grid 203 is converted by the inverter 100 to control the rotation speed of the alternating current unit 204, thereby achieving the effect of energy saving.

In the practical application of solar power generation system, in order to solve the problem of requiring battery energy storage and causing excessive cost, there is a commercial parallel power solar system. The system directly feeds solar power into the utility grid and installs commercial parallel power generation. The user of the system 200 charges all the power generated by the solar power generation device 202 to the utility grid 203 of the power company at an agreed price to directly sell the power output of the solar power generation device 202 to the power company, and thus, conventionally The mains parallel solar power generation system 200 cannot specify a certain part of the power output to a specific load, so it is difficult to achieve the purpose of self-production of green energy. In addition, as far as the application level is concerned, there is still a lot of unsuitability for the commercial parallel solar power generation system 200. For example, the commercial power parallel solar power generation system 200 must additionally be equipped with a power-off device 205 because of the parallel power generation of the commercial power. The system 200 may inject all of the power of the solar power plant 202 back into the utility grid 203 of the power company, which may create safety concerns, such as in a power company. When the mains grid 203 is overhauled, all the power sources supplied to the mains grid 203 need to be shut down to ensure safety. At this time, if the power of the solar power generating equipment 202 is still continuously returned to the utility grid 203 of the power company, the maintenance personnel may be endangered. The safety of the entire mains system, and even worse, the power law of some countries does not allow the use of the mains parallel solar power system 200.

Referring to FIG. 3, in order to enable solar power generation to be self-produced, the independent/hybrid solar power generation system 400 is conventionally used, which has a stand-alone solar charge controller 301, a solar power generation device 302, a battery pack 303, an inverter 304, and The inverter 100 and an automatic transfer switch (ATS) 401 are provided between the inverter 304 and the inverter 100 to achieve an effect of continuously outputting the output. The automatic changeover switch 401 is a device that switches between two sets of power supply systems. In the combined solar power generation system 400, the power automatic switch 401 is switched between the solar power generation system 402 and the commercial power system 403. However, in implementation, the solar power generation system 402 must first store the direct current generated by the solar power generation device 302 in the battery pack 303, and then confirm that the power of the selected battery pack 303 is sufficient by the power automatic switch 401 to select the solar power generation system 402. As a separate output power system, that is, the power input path of the solar power generation system 402 is turned on, and the power input path of the mains system 403 is turned off. At this time, the direct current stored in the battery pack 303 is converted into alternating current by the inverter 304, and then The power supply automatic switch 401 is output to the frequency converter 100, and the frequency converter 100 separately receives the power of the solar power generation system 402 to supply the alternating current appliance 404. That is to say, this type of solar power generation system 400 must not only have the power automatic switch 401, but also switch to the solar power supply completely replaced by the commercial power when the solar power generation system is insufficiently supplied, and the direct current generated by the solar power generation device 302 must also be generated. The conversion to AC power can be provided to the inverter 100, resulting in poor conversion efficiency. In addition, the battery pack 303 also needs to be replaced periodically, and there is a risk of failure.

Based on this, the conventional technologies all have the reverse conversion of other DC power sources (such as solar energy) that are not commercial power, resulting in low power generation efficiency and high power generation costs.

In order to solve the above problems of the prior art, the purpose of the creation is that it is not necessary to use an automatic power switch (ATS), and there is no need to convert the power multiple times, thereby providing a way to feed the power of the DC power generation module to the AC to AC power supply. A regenerative power supply device that provides a high-efficiency AC-AC power supply hybrid power supply with a DC side (DC BUS) of a device (for example, a frequency converter) for self-production purposes and without multiple conversions.

Another purpose of this creation is to provide commercial power compensation at the right time instead of replacing the mains, so that the AC-to-AC power supply (such as the inverter) becomes a hybrid power supply device for the mains and renewable energy.

For the above purposes and other purposes, the present invention provides a regenerative power supply device for providing a hybrid power supply of an AC to AC power supply device, which is disposed at a power output end of a DC power generation device and the AC to AC power supply device (for example, a frequency converter) The DC side (DC BUS) is mixed and supplied with the existing AC power source of the AC-AC power supply device, and the existing AC power source is converted into DC power by the rectifier to form the AC-to-AC power supply. The DC side of the device is characterized in that: the regenerative power supply device is provided with a voltage detecting circuit for detecting a DC side voltage condition of the AC to AC power supply device, and the regenerative energy supply device is provided according to the voltage detecting circuit a voltage conversion circuit that selectively converts an output voltage of the DC power generation device, the regenerative power supply device is provided with a rectifying component coupled between the voltage conversion circuit and a DC side of the AC to AC power supply device, The voltage conversion circuit adjusts an output voltage of the DC power generation device to output a conversion voltage, and the adjusted conversion The voltage level of the voltage change is lower than the existing AC power source acting on the DC side of the AC to AC power supply device At the voltage level, the rectifying element turns off the power between the voltage conversion circuit and the DC side of the AC to AC power supply to prevent it from being reversed to the voltage conversion circuit.

In the above-mentioned regenerative power supply device, the rectifying component is a diode or a plurality of diodes connected in series, and the voltage conversion circuit is based on a voltage detected by the voltage detecting circuit within a preset time. The voltage conversion circuit converts the output voltage of the DC power generation device to be slightly higher than the DC source voltage of the AC to AC power supply device to enable the DC power supply device to supply power to the AC to AC power supply device.

In order to achieve the above purposes and other purposes, the present invention provides a solar power supply device disposed between a power output end of a solar power generation device and a DC side of an AC to AC power supply device for input to the AC to AC power supply device. The existing AC power source is used for hybrid power supply, and the existing AC power source is converted to DC power by the rectifier to act on the DC side of the AC to AC power supply device. The solar power supply device includes: a voltage detection circuit, coupled Connecting the AC to the AC power supply device to generate a detection voltage level according to the voltage condition of the DC side of the AC to AC power supply device; a voltage conversion circuit coupled to the voltage detection circuit, the AC to AC power supply The device and the power output end of the solar power generation device are configured to selectively convert an output voltage of the solar power generation device according to the detection voltage level to adjust the output voltage to output a conversion voltage; and a rectifying component a power transmission path disposed between the voltage conversion circuit and the DC side of the AC to AC power supply device When the adjusted voltage level of the conversion voltage is lower than the detection voltage level, the rectifying element cuts off the power between the voltage conversion circuit and the DC side of the AC to AC power supply device to prevent it from being reversed to The voltage conversion circuit.

In the above solar power supply device, the voltage conversion circuit converts and adjusts the output voltage of the DC power generation device to output the conversion when the voltage detection circuit detects a voltage according to a preset time. Voltage.

In the solar power supply device described above, the voltage conversion circuit is one of a boost type, a buck type, or a boost-buck type circuit.

In the above solar power supply device, the voltage conversion circuit is one of an isolated or non-isolated circuit.

In the solar power supply device described above, the rectifying element is a series connection of a diode or a plurality of diodes.

For the above purposes and other purposes, the present invention provides a solar power supply system comprising: a solar power generation device for converting solar energy into electricity to generate an output voltage; an AC to AC to AC power supply device having a continuous flow a DC bus and an AC power input end, the AC power input end of the AC to AC power supply device is connected to a mains power grid, and the DC side of the AC to AC power supply device is connected to the solar power generation device to respectively receive the mains power grid The power and the power of the solar power generation device; and the solar power supply controller described above are disposed between the power output end of the solar power generation device and the DC bus of the AC to AC power supply device.

In the above solar power supply system, the AC to AC to AC power supply device is a frequency converter.

In the above solar power supply system, the DC side of the AC to AC power supply device may be a power factor correction circuit.

Therefore, the present invention detects the AC-to-AC power supply device by using the above-mentioned renewable energy power supply device (for example, a solar power supply device) and a renewable energy power supply system (for example, a solar power supply system) (generally referred to as VVVF INVERTER, variable voltage frequency conversion type) The voltage of the DC side of the current transformer (DC BUS), and according to the voltage of the DC side of the AC-to-AC power supply device, converts the voltage of the renewable energy power generation device (for example, a solar power generation device) to be slightly higher than the DC-side voltage, Provide power to AC to AC power supply. according to Therefore, the creation can reduce the power demand of the existing AC power source, and achieve the effect of simultaneously supplying the DC power of the hybrid energy source and the AC power of the utility power grid (that is, the existing AC power source). In other words, the creation can achieve the purpose of supplying the DC power of the renewable energy to the AC equipment with a minimum of equipment, without repeatedly switching the power generated by the power generation equipment, and since the AC power supply equipment has a rectifier inside, It does not cause the power of the DC power supply equipment to be recharged to the mains power grid, so that the renewable energy can be efficiently produced and used for self-production. Therefore, this creation does not require the use of an automatic power switch (ATS), and does not require multiple conversions of power, thereby providing a highly efficient regenerative power supply device that allows the power supply system to generate electricity from the self-contained solar power module.

100‧‧‧Inverter

101‧‧‧First power terminal

102‧‧‧second power terminal

103‧‧‧Rectifier

104‧‧‧ first node

105‧‧‧second node

106‧‧‧First power output

107‧‧‧second power output

200‧‧‧Commercial parallel solar power system

201‧‧‧Commercial parallel inverter

202‧‧‧Solar power equipment

203‧‧‧mains grid

204‧‧‧AC appliances

300‧‧‧Independent Solar Power System

301‧‧‧Independent Solar Charge Controller

302‧‧‧Solar power equipment

303‧‧‧Battery Pack

304‧‧‧Inverter

305‧‧‧AC electrical appliances

400‧‧‧Independent/hybrid solar power systems

401‧‧‧Power automatic switch

402‧‧‧Solar power system

403‧‧‧Power system

404‧‧‧AC appliances

500‧‧‧Solar power supply system

510‧‧‧Solar power equipment

520‧‧‧Solar power supply

521‧‧‧Voltage detection circuit

522‧‧‧Voltage conversion circuit

523‧‧‧Rectifying components

531‧‧‧mains power input

540‧‧‧AC to AC power supply

543‧‧‧Single flow rectifier

550‧‧‧AC appliances

603‧‧‧ DC side

C1‧‧‧ capacitor

VDC‧‧‧DC

Q1‧‧‧First transistor

Q2‧‧‧Second transistor

Q3‧‧‧ Third transistor

Q4‧‧‧4th transistor

[Fig. 1] is a schematic diagram of an internal circuit of a conventional inverter.

[Fig. 2] A schematic diagram of a conventional utility electric parallel solar power generation system.

[Fig. 3] A schematic view of a conventional independent/hybrid solar power generation system.

[Fig. 4] is a system architecture diagram of a first embodiment of the solar power supply system of the present invention.

[Fig. 5] is a functional block diagram of a solar power supply device inside the first embodiment of the solar power supply system of the present invention.

Fig. 6 is a schematic view showing a second embodiment of the solar power supply system of the present invention.

Fig. 7 is a schematic view showing a third embodiment of the solar power supply system of the present invention.

In order to fully understand the purpose, features and effects of this creation, the following specific examples, together with the attached drawings, provide a detailed description of the creation, as explained below: Please refer to FIG. 4 , which is a system architecture diagram of a first embodiment of the solar power supply system 500 of the present invention. As shown in FIG. 4 , the solar power system 500 includes a solar power generation device 510 , a solar power supply device 520 , and an AC transfer . The AC power supply device 540 is mixed with a mains power grid 530 and supplied to an AC appliance 550. The utility power grid 530 is part of the power system of the power company (that is, an existing AC power source), and is represented by a functional block; the AC-to-AC power supply device 540 can be a type as shown in FIG. The frequency converter 100 is used to change the frequency of the alternating current to achieve the purpose of controlling the motor speed. The alternating current alternating current power supply device 540 can also be an alternating current alternating current power supply device that outputs a fixed frequency (for example, 50 Hz or 60 Hz). The embodiment of the inverter 100 is limited to a load; the AC 550 is a load, which may be one or more. This is merely an example; the solar power generation device 510 is a conventional device and may include a solar panel. And other devices for converting solar energy into direct current power output. In the present creation, the solar power generation device 510 is an example of a direct current power generation device, and various power generation devices directly generating a direct current voltage or converted to a direct current voltage output. This creation is applicable to power generation equipment.

The solar power supply device 520 of the present invention is disposed between the power output end of the solar power generation device 510 and the AC to AC power supply device 540 for detecting the voltage on the input side of the AC to AC power supply device 540, and according to the The voltage of the input side of the alternating current power supply device 540 is converted to a predetermined voltage level by the voltage of the power input from the power input end of the solar power generation device 510, and the alternating current alternating current power supply device 540 is coupled to the solar power supply device 520 and the utility power grid 530 respectively receive the DC power generated by the solar power supply device 520 after converting the power of the solar power generation device 510 and the AC power input by the utility power grid 530 to perform hybrid power supply.

Referring to FIG. 5, it is a functional block diagram of a solar power supply device 520 in the first embodiment of the solar power supply system 500 of the present invention, which is used to illustrate the solar power supply device 520 of FIG. An internal configuration, but is not limited to the embodiment shown in FIG. As shown in FIG. 5, the solar power supply device 520 includes a voltage detecting circuit 521, a voltage converting circuit 522, and a rectifying component 523 for detecting the AC-to-AC power supply device 540. The voltage of the DC side 603 is used by the solar power supply device 520 to monitor the voltage status of the DC side 603 of the AC-to-AC power supply device 540, and generate a detection voltage level, wherein the other power source (for example, the utility power) is borrowed. The AC-to-AC power supply device 540 is converted to DC power and acts on the DC side of the AC-to-AC power supply device 540. The voltage conversion circuit 522 is coupled to the voltage detection circuit 521, which has a certain degree of voltage pull-up capability to pull up the output voltage generated by the solar power generation device 510 to output a conversion voltage. When the output power of the solar power generation device 510 is sufficient to supply the AC power supply 550, the output voltage generated by the solar power generation device 510 is pulled up to be slightly higher than the commercial power to be converted by the AC-to-AC power supply device 540. The voltage level after the direct current (for frequency conversion) can be powered by the solar power generation device 510. When the current situation or other factors cause the output power of the solar power generation device 510 to be insufficient to supply the communication device 550, The mains supply is used as a source of hybrid power supply, and its circuit principle is further explained in the description of Figure 6. The rectifying component 523 is disposed between the voltage converting circuit 522 and the DC side 603 of the AC-to-AC power supply device 540. The voltage level of the converted voltage is lower than the detecting voltage. In the case of the bit, the rectifying element 523 interrupts the power transmission path between the voltage converting circuit 522 and the DC side of the AC-AC power supply device 540, that is, the rectifying element 523 can serve as an automatic reacting cut-off element. More specifically, the rectifying element 523 can be a diode or a plurality of diodes connected in series. The voltage converting circuit 522 can be a boost, a buck, or a buck-boost type. (boost-buck) circuit, depending on the actual needs of the user.

Referring to FIG. 6 and FIG. 7 together, FIG. 6 is a schematic diagram of a second embodiment of the hybrid solar power generation system of the present invention, and FIG. 7 is a schematic diagram of a third embodiment of the hybrid solar power generation system of the present invention, FIG. And FIG. 7 can be used to illustrate that the AC-to-AC power supply device 540 is a single-phase inverter or a three-phase inverter, but the single-phase inverter or the three-phase inverter is a conventional structure, so it will not be described again. The AC to AC power supply 540 can include one or more single flow rectifiers 543. As shown in FIG. 7, the AC side 542 of the AC to AC power supply 540 can include a single flow rectifier 543, the single flow rectifier. The 543 is disposed at a mains power input end 531 corresponding to the mains grid to convert the mains (alternating current) into direct current, and the solar power supply device 520 and the mains are isolated to allow different power systems to not interfere with each other. In addition, in conjunction with the function of the solar power supply device 520, the AC-to-AC power supply device 540 is an energy-saving device having a hybrid power source such as a renewable energy source (for example, solar energy in the embodiment) and a commercial power supply at the same time, that is, the AC transfer The AC power supply unit 540 can select the timing of the utility power compensation at the right time instead of providing only the commercial power supply as in the conventional technology. In more detail, when the output power of the solar power generation device 510 is sufficient to supply the demand of the AC electrical device 550, the solar power supply device 520 pulls the output voltage of the solar power generation device 510 to be slightly higher than the commercial power to be converted by the single flow rectifier 543. It is the voltage level after the DC power. At this time, the single-flow rectifier 543 is not turned on due to the diode principle, so it can be completely powered by the solar power generation device 510. Moreover, when the current situation or other factors cause the output power of the solar power generation device 510 to be insufficient to supply the AC electric appliance 550, the solar power supply device 520 will still pull the output voltage of the solar power generation device 510 to the beginning. Slightly higher than the voltage level after the mains is converted to direct current by the single current rectifier 543, but as the output current increases, the output voltage of the solar power supply device 520 cannot be maintained at a slightly higher frequency than the single current to the rectifier 543. The voltage level after the DC power is reduced to a voltage lower than the DC side of the AC-to-AC power supply device. At this time, the rectifying element 523 in the solar power supply device 520 is not turned on due to the diode principle. Make this The solar power generation device 510 temporarily stops the power supply, and is temporarily supplemented by the commercial power. Since the solar power supply device 520 temporarily stops the power supply, the converted voltage is once again pulled up to a voltage slightly higher than the power converted by the commercial power to the direct current rectifier 543 to the direct current. The power is supplied again, and the process can be performed naturally in a very short time. By the utility power compensating for the insufficient output power of the solar power generation device 510, the solar power generation device 510 is mixed with the commercial power to supply power instead of A single power supply completely replaces the power supply of another power supply (for example, the method of selecting a single power supply with an automatic power switch (ATS)). In addition, when the output power of the solar power generation device 510 is zero, the rectifying element 523 in the solar power supply device 520 is not turned on due to the diode principle, so the AC-to-AC power supply device 540 does not recharge the power of the utility power. To the solar power plant 510 (generally referred to as leakage).

The principle of FIG. 7 is substantially the same as that of FIG. 6, and only the circuit of FIG. 6 is simply transferred to a three-phase inverter, and therefore will not be described again.

In other embodiments, the voltage conversion circuit 522 can be a non-isolated circuit, or an isolated circuit. The AC-to-AC power supply device 540 may include a power factor correction circuit (not shown), and the output of the power factor correction circuit is the DC side of the AC-to-AC power supply device 540.

In summary, the present invention detects the voltage of the DC side 603 of the AC-to-AC power supply device 540 by the solar power controller and the hybrid solar power system described above, and according to the DC side 603 of the AC-to-AC power supply device 540. Voltage, converting the voltage of the power input by the solar power generation device 510 to a predetermined voltage level, so that the AC-to-AC power supply device 540 can select the timing of the utility power compensation to mix the DC power of the renewable energy source and the AC power of the city power. Therefore, this creation does not require the use of an automatic power switch (ATS), and does not require multiple conversions of power, thereby providing a high-efficiency supply of AC-to-AC power supply that allows the power supply system to generate electricity from its own solar power module. A renewable energy supply device for the power source (eg, solar powered device 520).

The present invention has been disclosed in the above preferred embodiments, and it should be understood by those skilled in the art that the present invention is only intended to depict the present invention and should not be construed as limiting the scope of the present invention. It should be noted that variations and permutations equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of protection of this creation is subject to the definition of the scope of patent application.

500‧‧‧Solar power supply system

510‧‧‧Solar power equipment

520‧‧‧Solar power supply

530‧‧‧mains grid

540‧‧‧AC to AC power supply

550‧‧‧AC appliances

Claims (10)

A regenerative energy supply device for providing a hybrid power supply of an AC to AC power supply device is disposed between a power output end of a DC power generation device and a DC side of the AC to AC power supply device to input to the AC The existing AC power source of the AC power supply device is used for hybrid power supply, and the existing AC power source is converted to DC power by the AC to AC power supply device to act on the DC side of the AC to AC power supply device, and is characterized by: The regenerative power supply device is provided with a voltage detecting circuit for detecting a DC side voltage condition of the AC to AC power supply device, and the regenerative energy supply device is configured to selectively convert the DC according to the detection result of the voltage detecting circuit a voltage conversion circuit of the output voltage of the power generation device, the regenerative power supply device is provided with a rectifying component coupled between the voltage conversion circuit and the DC side of the AC to AC power supply device, and the voltage conversion circuit adjusts the DC power generation device Output voltage and output a conversion voltage, the voltage level of the converted voltage is lower than the existing voltage When the AC power source acts on the DC level of the AC-to-AC power supply device, the rectifying element turns off the power between the voltage conversion circuit and the DC side of the AC-to-AC power supply device to prevent it from being reversed to the voltage conversion. Circuit. The regenerative power supply device of claim 1, wherein the rectifying component is a diode or a plurality of diodes connected in series, and the voltage conversion circuit has a voltage detecting circuit according to a preset time. When a voltage is detected, the voltage conversion circuit converts and adjusts an output voltage of the DC power generating device to output the converted voltage. A solar power supply device is disposed between a power output end of a solar power generation device and a DC side of an AC-to-AC power supply device for hybrid power supply with an existing AC power source input to the AC-to-AC power supply device, The AC power source is applied to the DC side of the AC-to-AC power supply device by the AC-to-AC power supply device, and the solar power supply device includes: a voltage detection circuit coupled to the AC-to-AC power supply The device generates a detection voltage level according to the voltage condition of the DC side of the AC to AC power supply device; a voltage conversion circuit is coupled to the voltage detection circuit, the AC to AC power supply device, and the solar power generation device The power output end is configured to selectively convert an output voltage of the solar power generation device according to the detection voltage level to adjust the output voltage to output a conversion voltage; and a rectifying component is disposed in the voltage conversion circuit And the converted power in the power transmission path between the DC sides of the AC-to-AC power supply device When the voltage level is lower than the detection voltage level, the cutoff of the line voltage rectifier element circuit of the power conversion apparatus between the AC power supply and DC side to the AC switch, to prevent the reverse voltage conversion circuit to sink. The solar power supply device of claim 3, wherein the voltage conversion circuit converts and adjusts an output voltage of the DC power generation device when the voltage detection circuit detects a voltage according to a predetermined time. To output the converted voltage. The solar power supply device of claim 3 or 4, wherein the voltage conversion circuit is one of a boost, a buck, or a boost-buck circuit. The solar power supply device of claim 3 or 4, wherein the voltage conversion circuit is one of an isolated or non-isolated circuit. The solar power supply device of claim 3 or 4, wherein the rectifying element is a diode or a plurality of diodes connected in series. A solar power supply system comprising: a solar power generation device for converting solar energy into electric power to generate an output voltage; an alternating current to alternating current power supply device having a flow side and an alternating current side, the alternating current to the alternating current power supply device Connected to a mains power grid, the DC side of the AC-to-AC power supply device is connected to the solar power generation device to respectively receive the power of the utility power grid and the power of the solar power generation device; and a solar power supply device disposed on the solar power generation device The power output terminal and the DC side and the AC side of the AC-to-AC power supply device include: a voltage detecting circuit coupled to the AC-to-AC power supply device to adjust the voltage of the DC side of the AC power supply device according to the AC power supply device a voltage conversion circuit is coupled to the voltage detection circuit, the DC side of the AC to AC power supply device, and the power output end of the solar power generation device for determining the detection voltage Selectively convert the solar power generation The output voltage of the device is used to adjust the output voltage to output a conversion voltage; and a rectifying component is disposed on the power transmission path between the voltage conversion circuit and the DC side of the AC to AC power supply device, and is adjusted When the voltage level of the conversion voltage is lower than the detection voltage level, the rectifying element turns off the power between the voltage conversion circuit and the DC side of the AC to AC power supply device to prevent it from being reversely poured to the voltage conversion circuit. . The solar power supply system of claim 8, wherein the AC to AC power supply device is a frequency converter. The solar power supply system of claim 8, wherein the DC side of the AC to AC power supply device comprises a power factor correction circuit.