CN-115001059-B - Hybrid power supply circuit and hybrid power supply control method

CN115001059BCN 115001059 BCN115001059 BCN 115001059BCN-115001059-B

Abstract

The application provides a hybrid power supply circuit and a hybrid power supply control method. The method comprises the steps that in the starting process of target equipment, the Boost boosting circuit 1 and the Boost boosting circuit 2 are used for jointly supplying power through the closing of the output voltage of the solar photovoltaic module and the control switch, wherein the Boost boosting circuit 1 is used for boosting the output voltage of the solar photovoltaic module to be direct-current bus voltage, the Boost boosting circuit 2 is used for boosting the output voltage of alternating-current mains supply to be direct-current bus voltage, and in the running process of the target equipment, the Boost boosting circuit 1 and the Boost boosting circuit 2 are used for jointly supplying power through the closing of the maximum output power of the solar photovoltaic module and the control switch. The application improves the reliability of the circuit.

Inventors

LIN HUI
SUN LEI
SONG AI
LIANG SHANG

Assignees

珠海格力电器股份有限公司

Dates

Publication Date: 20260512
Application Date: 20220624

Claims (14)

1. A hybrid power supply circuit, the circuit comprising: One side of the switch 1 is connected with the output end of the solar photovoltaic module, and the other side of the switch 1 is respectively connected with the input end of the Boost circuit 1 and one side of the switch 3, and is used for controlling the power supply of the solar photovoltaic module, wherein the power supply of the solar photovoltaic module is used for supplying power through the Boost circuit 1 and the Boost circuit 2 together when the switch 1 and the switch 3 are closed and the switch 2 is opened; the switch 2 is connected with the output end of the mains supply on one side and the input end of the rectifier bridge on the other side, and is used for controlling the power supply of the alternating-current mains supply, wherein the alternating-current mains supply is used for supplying power through the Boost circuit 1 and the Boost circuit 2 together when the switch 2 and the switch 3 are closed and the switch 1 is opened; The switch 3 is respectively connected with the output end of the rectifier bridge and the input end of the Boost circuit 2 at the other side, and is used for realizing the common power supply of the solar photovoltaic module and the alternating current commercial power according to the disconnection of the switch 3 and realizing the independent power supply of the solar photovoltaic module or the alternating current commercial power according to the closing of the switch 3, wherein the common power supply of the solar photovoltaic module and the alternating current commercial power is used for commonly supplying power through the Boost circuit 1 and the Boost circuit 2 when the switch 1 and the switch 2 are closed and the switch 3 is opened.
2. A hybrid power supply control method, characterized in that the method comprises: In the starting process of target equipment, the Boost circuit 1 and the Boost circuit 2 are adopted to jointly supply power through the closing of the control switch in the hybrid power supply circuit of claim 1 and the output voltage of the solar photovoltaic module, wherein the Boost circuit 1 is used for lifting the output voltage of the solar photovoltaic module to be a direct-current bus voltage, and the Boost circuit 2 is used for lifting the output voltage of alternating-current mains supply to be a direct-current bus voltage; During the operation of the target device, the Boost circuit 1 and the Boost circuit 2 are adopted to jointly supply power through the maximum output power of the solar photovoltaic module and the closing of a control switch in the hybrid power supply circuit described in claim 1.
3. The method according to claim 2, wherein the step-up circuit 1 and the Boost circuit 2 are used for jointly supplying power by closing the output voltage of the solar photovoltaic module and the control switch during the opening process of the target device, comprising: when the target equipment is started, a switch 2 is closed, and the output voltage of the solar photovoltaic module is detected through a voltage detection circuit, wherein the switch 2 is used for controlling the power supply of alternating current commercial power; When the output voltage is smaller than a voltage threshold value, the switch 1 is opened and the switch 3 is closed to supply alternating-current mains supply, wherein the switch 1 is opened, the switch 2 and the switch 3 are closed, and the alternating-current mains supply is used for supplying power through the Boost circuit 1 and the Boost circuit 2; under the condition that the output voltage is greater than or equal to a voltage threshold, the common power supply of the solar photovoltaic module and the alternating current mains supply is realized by closing the switch 1 and opening the switch 3, wherein the switch 1 and the switch 2 are closed and the switch 3 is opened, and the current of the solar photovoltaic module passes through the Boost circuit 1 and the current of the alternating current mains supply passes through the Boost circuit 2 to realize the power supply.
4. A method according to claim 3, characterized in that in case the output voltage is smaller than a voltage threshold, the supply of ac mains by opening the switch 1 and closing the switch 3 comprises: When the output voltage is smaller than a voltage threshold value, the switch 1 and the switch 3 are opened, the switch 2 is closed, and power is supplied through the Boost circuit 2; closing the switch 3 if it is detected that the current of the dc bus exceeds the set current or that the power of the dc bus exceeds the set power; the alternating current commercial power is controlled to pass through the switch 2 and the switch 3, and the Boost circuit 1 and the Boost circuit 2 are used for realizing common power supply.
5. The method according to claim 2, wherein, during operation of the target device, by maximum output power of the solar photovoltaic module and closing of the control switch, the co-powering with the Boost circuit 1 and the Boost circuit 2 comprises: Determining the maximum output power of the solar photovoltaic module by using a maximum power point tracking algorithm; When the maximum output power is smaller than a power threshold value, the switch 1 is opened, the switch 2 and the switch 3 are closed, and the power supply of the alternating-current mains supply is realized, wherein the switch 1 is opened, the switch 2 and the switch 3 are closed, and the current of the alternating-current mains supply is used for realizing the power supply through the Boost circuit 1 and the Boost circuit 2; when the maximum output power is larger than or equal to a power threshold, judging whether the maximum output power is larger than or equal to the required overall power of target equipment; When the maximum output power is greater than or equal to the required overall power, the switch 1 and the switch 3 are closed, and the switch 2 is opened, so that the solar photovoltaic module is powered, wherein the switch 1 and the switch 3 are closed, and the switch 2 is opened, so that the current of the solar photovoltaic module is powered through the Boost circuit 1 and the Boost circuit 2; Under the condition that the maximum output power is smaller than the required overall power, the solar photovoltaic module and the alternating current mains supply are supplied together by closing the switch 1, the switch 2 and opening the switch 3, wherein the closing of the switch 1, the switch 2 and the opening of the switch 3 are used for enabling the current of the solar photovoltaic module to pass through the Boost circuit 1 and the current of the alternating current mains supply to pass through the Boost circuit 2.
6. The method according to claim 5, wherein, in case the maximum output power is smaller than the required overall power, the co-powering of the solar photovoltaic module and the ac mains by closing switch 1, switch 2 and opening switch 3 comprises: And under the condition that the maximum output power is smaller than the required overall power, determining the output power of the alternating-current commercial power by controlling the switching frequency and the duty ratio of the switching tube 2 in the Boost circuit 2, wherein the output power is larger than the preset power.
7. The method of claim 2, wherein after the target device is operated, the method further comprises: By controlling the closing of the switch, the state switching between different power supply states is realized, wherein each power supply state adopts the Boost circuit 1 and the Boost circuit 2 to jointly supply power.
8. The method of claim 7, wherein said switching states between different power supply states by controlling the closing of a switch comprises: when the target equipment adopts the solar photovoltaic module and the alternating current mains supply to supply power together, the power supply state is switched to the solar photovoltaic module power supply or the alternating current mains supply or the solar photovoltaic module and the alternating current mains supply are maintained to supply power together through the maximum output power of the solar photovoltaic module and the closing of the control switch; when the target equipment adopts a solar photovoltaic module to supply power, the power supply state is switched to the solar photovoltaic module and the alternating current mains supply to supply power together or to maintain the power supply of the solar photovoltaic module through the maximum output power of the solar photovoltaic module, the required overall power of the target equipment and the closing of a control switch; When the target equipment is powered by alternating current mains supply, the power supply state is switched to the state that the solar photovoltaic module and the alternating current mains supply together or the alternating current mains supply is maintained by closing the output voltage of the solar photovoltaic module and the control switch.
9. The method of claim 8, wherein when the target device is powered by both the solar photovoltaic module and the ac mains, switching the power supply state to the solar photovoltaic module power supply by the maximum output power of the solar photovoltaic module and the closing of the control switch comprises: When the target equipment is powered by a solar photovoltaic module and alternating current mains supply together, if the maximum output power of the solar photovoltaic module is more than or equal to the required whole power, the switching tube 2 is controlled to stop working; the switching frequency and the duty ratio of the switching tube 1 are adjusted so that the voltage of the direct current bus is larger than the output voltage of alternating current mains supply and the current flowing through the Boost circuit 2 is 0; After the switch 2 is opened, the switch 3 is closed, the switch tube 2 works, and the power supply state is switched to the power supply of the solar photovoltaic module.
10. The method of claim 8, wherein when the target device is powered by both the solar photovoltaic module and the ac mains, switching the power supply state to the ac mains power by the maximum output power of the solar photovoltaic module and the closing of the control switch comprises: When the target equipment adopts a solar photovoltaic module and alternating current mains supply to supply power together, if the maximum output power of the solar photovoltaic module is smaller than a power threshold value, the switching tube 1 is controlled to stop working; the switching frequency and the duty ratio of the switching tube 2 are adjusted so that the voltage of the direct current bus is larger than the output voltage of the solar photovoltaic module, and the current flowing through the Boost circuit 1 is 0; After the switch 1 is opened, the switch 3 is closed, the switch tube 1 works, and the power supply state is switched to AC mains supply.
11. The method of claim 8, wherein when the target device is powered by ac mains, switching the power supply state to the solar photovoltaic module and the ac mains together by the output voltage of the solar photovoltaic module and the closing of the control switch comprises: When the target equipment is powered by alternating current mains supply, if the output voltage of the solar photovoltaic module is greater than a voltage threshold value, the switching tube 1 is controlled to stop working; The switching frequency and the duty ratio of the switching tube 2 are adjusted so that the voltage of the direct current bus is larger than the output voltage of alternating current mains supply and the current flowing through the Boost circuit 1 is 0; After the switch 3 is opened, the switch 1 is closed, the switch tube 1 works, and the power supply state is switched to the common power supply of the solar photovoltaic module and the alternating current mains supply.
12. The method of claim 4, wherein the step of determining the position of the first electrode is performed, After the running state of the target equipment is determined, the currents passing through the Boost circuit 1 and the Boost circuit 2 are distributed by respectively controlling the switching frequency and the duty ratio of the switching tube 1 in the Boost circuit 1 and the switching frequency and the duty ratio of the switching tube 2 in the Boost circuit 2 so as to reduce the power consumption of components in the Boost circuit and the rate of temperature rise.
13. The method of claim 2, wherein the step of determining the position of the substrate comprises, When the target equipment is normally shut down, the load is stopped, then the switch 1 and the switch 2 are opened, and when the current flowing through the switch 3 is smaller than the current threshold value, the switch 3 is opened.
14. The method of claim 2, wherein the step of determining the position of the substrate comprises, When the target equipment is in emergency power failure, the switch 1, the switch 2 and all loads are simultaneously turned off, and finally the switch 3 is turned off.

Description

Hybrid power supply circuit and hybrid power supply control method Technical Field The application relates to the technical field of circuits, in particular to a hybrid power supply circuit and a hybrid power supply control method. Background Along with the increasingly outstanding contradiction between energy shortage and production and life on energy demand, the development and application of new energy are gradually paid attention to all countries in the world. The clean and environment-friendly photovoltaic power generation and the application thereof become one of the popular research fields in China, and the market prospect in the related field of the photovoltaic is wider. For environmental protection and energy conservation, clean renewable solar energy can be applied to household equipment at present. At present, the technical schemes of commercial power and photovoltaic hybrid power supply are more, and the schemes are that a photovoltaic power generation grid-connected system is directly integrated on the direct current side of an air conditioner power supply system with mature technology, and the photovoltaic power generation grid-connected system and the commercial power form the hybrid power supply system. Because the commercial power and the solar photovoltaic are provided with the Boost circuits, the Boost circuits of the solar power supply are idle and do not work in the scene that solar energy cannot supply power (such as cloudy days, rainy days and evenings). Or the solar energy is enough, and the Boost circuit of the alternating current mains supply is idle and does not work under the scene that the air conditioner only needs solar energy to supply power and does not need alternating current mains supply. Therefore, in the prior art, when the commercial power and the photovoltaic are in mixed power supply, the current only passes through one Boost circuit, the current flow in the Boost circuit is large, the components are easy to damage, and the circuit reliability is low. Disclosure of Invention The embodiment of the application aims to provide a hybrid power supply circuit and a hybrid power supply control method, which are used for solving the problem of low circuit reliability. The specific technical scheme is as follows: in a first aspect, there is provided a hybrid power supply circuit, the circuit comprising: One side of the switch 1 is connected with the output end of the solar photovoltaic module, and the other side of the switch 1 is respectively connected with the input end of the Boost circuit 1 and one side of the switch 3, and is used for controlling the power supply of the solar photovoltaic module, wherein the power supply of the solar photovoltaic module is used for supplying power through the Boost circuit 1 and the Boost circuit 2 together when the switch 1 and the switch 3 are closed and the switch 2 is opened; The switch 2 is connected with the output end of the mains supply on one side and the input end of the rectifier bridge on the other side, and is used for controlling the power supply of the alternating-current mains supply, wherein the alternating-current mains supply is used for supplying power through the Boost circuit 1 and the Boost circuit 2 together when the switch 2 and the switch 3 are closed and the switch 1 is opened; The switch 3 is respectively connected with the output end of the rectifier bridge and the input end of the Boost circuit 2 at the other side, and is used for realizing the common power supply of the solar photovoltaic module and the alternating current commercial power according to the disconnection of the switch 3 and realizing the independent power supply of the solar photovoltaic module or the alternating current commercial power according to the closing of the switch 3, wherein the common power supply of the solar photovoltaic module and the alternating current commercial power is used for commonly supplying power through the Boost circuit 1 and the Boost circuit 2 when the switch 1 and the switch 2 are closed and the switch 3 is opened. In a second aspect, there is provided a hybrid power supply control method, the method including: In the starting process of target equipment, the Boost circuit 1 and the Boost circuit 2 are adopted to jointly supply power through the closing of the output voltage of the solar photovoltaic module and the control switch, wherein the Boost circuit 1 is used for lifting the output voltage of the solar photovoltaic module to be a direct-current bus voltage, and the Boost circuit 2 is used for lifting the output voltage of alternating-current mains supply to be a direct-current bus voltage; In the operation process of the target equipment, the Boost circuit 1 and the Boost circuit 2 are adopted to jointly supply power through the maximum output power of the solar photovoltaic module and the closing of the control switch. Optionally, in the process of opening the target device, the step-up circuit 1 and