CN220172864U - Power supply circuit and air conditioning equipment - Google Patents

Abstract

The utility model provides a power supply circuit and an air conditioning device. The power supply circuit comprises a bidirectional direct current-direct current conversion circuit, an acquisition circuit and a controller. The bidirectional direct current-direct current conversion circuit comprises a first direct current port used for transmitting a first direct current and a second direct current port used for transmitting a second direct current, and is used for realizing the mutual conversion between the first direct current and the second direct current; the first direct current port is used for supplying power to a load device, and the second direct current port is used for outputting second direct current to the energy storage circuit so as to charge the energy storage circuit, or receiving the second direct current output by the energy storage circuit so as to discharge the energy storage circuit. The acquisition circuit is used for acquiring the operation parameters of the energy storage circuit during charging or discharging to obtain corresponding detection signals. The controller enables or disables the bidirectional DC-DC conversion circuit according to the detection signal. The power supply circuit can improve the utilization rate of equipment and reduce the cost.

Description

Power supply circuit and air conditioning equipment

Technical Field

The present utility model relates to the field of air conditioning technologies, and in particular, to a power supply circuit and an air conditioning apparatus.

Background

The air conditioner is one of electric loads with higher energy consumption in the building, is also necessary electric equipment for industry/families, and is born with the continuous increase of domestic electric loads, so that the energy storage air conditioner can supply power to the load by a power grid and charge an energy storage battery in the trough period of the power grid, and the energy storage battery supplies power to the load in the peak period of the power grid, thereby achieving the purposes of peak clipping, valley filling and electric energy saving.

However, in the existing energy storage air conditioner, each functional module is arranged in a scattered manner and has a single function, the structure of the energy storage air conditioner is complex, the integration level is low, and the production cost of the air conditioner is high.

Disclosure of Invention

Therefore, the main purpose of the utility model is to provide a power supply circuit and air conditioning equipment, and solve the problems of complex structure, numerous power electronic components and low integration level of the existing energy storage air conditioner, and greatly increasing the production cost of the air conditioner.

A first aspect of the present utility model provides a power supply circuit comprising a bi-directional dc-dc conversion circuit, an acquisition circuit, and a controller. The bidirectional direct current-direct current conversion circuit comprises a first direct current port used for transmitting a first direct current and a second direct current port used for transmitting a second direct current, and is used for realizing the mutual conversion between the first direct current and the second direct current; the first direct current port is used for supplying power to a load device, the second direct current port is used for being electrically connected with the energy storage circuit, and the second direct current port is used for outputting the second direct current to the energy storage circuit so as to charge the energy storage circuit, or receiving the second direct current output by the energy storage circuit so as to discharge the energy storage circuit. The acquisition circuit is respectively and electrically connected with the energy storage circuit and the controller, and the controller is also electrically connected with the bidirectional direct current-direct current conversion circuit. The acquisition circuit is used for acquiring the operation parameters of the energy storage circuit during charging or discharging to obtain corresponding detection signals, and outputting the detection signals to the controller. The controller enables or disables the bidirectional DC-DC conversion circuit according to the detection signal, so that the energy storage circuit can be charged/discharged or the energy storage circuit is disabled from being charged/discharged. The power supply circuit further comprises a bidirectional alternating current-direct current conversion circuit. The bidirectional alternating current-direct current conversion circuit comprises a third direct current port and a first alternating current port, wherein the third direct current port is used for transmitting the first direct current, the first alternating current port is used for being electrically connected with a power grid and used for transmitting the first alternating current, and the bidirectional alternating current-direct current conversion circuit is used for realizing the mutual conversion between the first alternating current and the first direct current.

According to the power supply circuit provided by the utility model, the operation parameters of the energy storage circuit during charging or discharging are collected through the collection circuit to obtain the corresponding detection signals, and the controller enables or disables the bidirectional direct current-direct current conversion circuit according to the detection signals, so that the energy storage circuit can be charged/discharged or the energy storage circuit can not be charged/discharged, namely, the bidirectional direct current-direct current conversion circuit is reused as the protection circuit of the energy storage circuit, the utilization rate of equipment can be improved, the number of elements can be reduced, the device is simplified, the space is saved, and the cost is reduced.

Optionally, the power supply circuit further includes a dc-ac conversion circuit, the dc-ac conversion circuit includes a second ac port and a fourth dc port, the second ac port is electrically connected with the load device, the fourth dc port is electrically connected with the first dc port and the third dc port, respectively, the dc-ac conversion circuit is configured to receive the first dc through the fourth dc port and convert the first dc into a second ac, and output the second ac through the second ac port to drive the load device to operate.

Optionally, when the bidirectional dc-dc conversion circuit is enabled, the operation mode of the power supply circuit includes a charging mode and a discharging mode. The first alternating current comprises an alternating current provided by a power grid when the power supply circuit is in a charging mode. The power grid, the bidirectional alternating current-direct current conversion circuit and the bidirectional direct current-direct current conversion circuit form a charging circuit for charging the energy storage circuit, and the charging circuit converts alternating current provided by the power grid into second direct current and outputs the second direct current to the energy storage circuit, so that the energy storage circuit receives the second direct current for charging. When the power supply circuit is in a discharging mode, the energy storage circuit, the bidirectional direct current-direct current conversion circuit and the direct current-alternating current conversion circuit form a first driving circuit for driving the load equipment to operate, the energy storage circuit outputs the second direct current to the first driving circuit to discharge, and the first driving circuit converts the second direct current into the second alternating current and outputs the second alternating current to the load equipment, so that the load equipment receives the second alternating current to operate.

Optionally, the acquisition circuit includes at least one of a current acquisition circuit, a voltage acquisition circuit, and a temperature acquisition circuit. The current acquisition circuit is used for acquiring charge/discharge current of the energy storage circuit to obtain a corresponding current detection signal. The voltage acquisition circuit is used for acquiring charge/discharge voltage of the energy storage circuit to obtain corresponding voltage detection signals. The temperature acquisition circuit is used for acquiring the temperature of the energy storage circuit and obtaining a corresponding temperature detection signal. The detection signal output by the acquisition circuit to the controller comprises at least one of the voltage detection signal, the current detection signal and the temperature detection signal. The controller disables the bidirectional DC-DC conversion circuit when the signal value of the voltage detection signal is not within a preset voltage range, or when the signal value of the current detection signal is higher than a preset current threshold, or when the signal value of the temperature detection signal is higher than a preset temperature threshold.

Optionally, the controller is further electrically connected to the bidirectional ac-dc conversion circuit and the dc-ac conversion circuit, respectively. When the power supply circuit is in a charging mode, the controller is used for controlling the bidirectional alternating current-direct current conversion circuit to convert the first alternating current into the first direct current and output the first direct current to the bidirectional direct current-direct current conversion circuit, and controlling the bidirectional direct current-direct current conversion circuit to convert the first direct current into the second direct current and output the second direct current to the energy storage circuit. When the power supply circuit is in a discharging mode, the controller is used for controlling the bidirectional direct current-direct current conversion circuit to convert the second direct current output by the energy storage circuit into the first direct current and output the first direct current to the direct current-alternating current conversion circuit, and controlling the direct current-alternating current conversion circuit to convert the first direct current into the second alternating current and output the second alternating current to the load equipment.

Optionally, the power supply circuit further includes a power interface and a voltage transformation circuit, wherein the voltage transformation circuit includes a primary side port and a secondary side port, the primary side port is electrically connected with the power interface, and the secondary side port is electrically connected with the first ac port. When the power supply circuit is in a charging mode, the power supply interface is used for receiving alternating current provided by a power grid, the transformation circuit receives the alternating current provided by the power grid through the primary side port, transforms the alternating current provided by the power grid to obtain the first alternating current, and outputs the first alternating current to the first alternating current port through the secondary side port.

Optionally, the power supply circuit further includes a photovoltaic module and a photovoltaic control circuit, and the photovoltaic control circuit is electrically connected between the fourth dc port and the photovoltaic module. The working mode of the power supply circuit also comprises a power generation mode. When the power supply circuit is in a power generation mode, the photovoltaic module, the photovoltaic control circuit and the direct current-alternating current conversion circuit form a second driving circuit for driving the load equipment to operate, wherein the photovoltaic module is used for converting received solar energy into electric energy and outputting the electric energy to the photovoltaic control circuit, and the photovoltaic control circuit is used for converting the electric energy output by the photovoltaic module to obtain the first direct current and outputting the first direct current to the direct current-alternating current conversion circuit. The direct current-alternating current conversion circuit converts the first direct current into the first alternating current to drive the load equipment to operate.

Optionally, the power supply circuit further comprises a power interface, a switching circuit and a power output interface. The power interface is used for receiving alternating current provided by a power grid. The switch circuit comprises a first connection port and a second connection port, the first connection port is electrically connected with the power interface, the second connection port is electrically connected with the first alternating current port and the electric energy output interface respectively, and the electric energy output interface is used for providing the first alternating current for external alternating current equipment. The switching circuit is turned on when the power supply circuit is in a charging mode and turned off when the power supply circuit is in a discharging mode.

A second aspect of the present utility model provides an air conditioning apparatus comprising the above power supply circuit and an air conditioning compressor electrically connected to the power supply circuit. The power supply circuit is at least used for driving the air conditioner compressor to operate.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

Fig. 1 is a topology diagram of a power supply circuit according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of power supply of the power supply circuit in the charging mode according to the embodiment of the utility model.

Fig. 3 is a schematic diagram of power supply of the power supply circuit in the discharging mode according to the embodiment of the present utility model.

Fig. 4 is a schematic diagram of power supply of the power supply circuit in the power generation mode according to the embodiment of the utility model.

Fig. 5 is a schematic circuit diagram of a power supply circuit according to an embodiment of the present utility model.

The reference numerals are explained as follows:

air conditioning apparatus 1

Power supply circuit 100

Bidirectional ac-dc conversion circuit 10

Third DC port 12

First ac port 11

Bidirectional DC-DC conversion circuit 20

First inverter 201

Second converter 202

Transformer 203

First DC port 21

Second DC port 22

DC-AC conversion circuit 30

Second ac port 31

Fourth DC port 32

Tank circuit 40

Acquisition circuit 50

Controller 60

Power interface 70

Transformation circuit 110

Photovoltaic module 90

Photovoltaic control circuit 91

Switching circuit S1

First connection port S11

Second connection port S12

Electric energy output interface 80

PWM module 101

Drive modules 102 to 108

Load device 200

External communication device 300

Power grid 400

The utility model will be further described in the following detailed description in conjunction with the above-described figures.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1-2 together, the present utility model provides a power supply circuit 100, wherein the power supply circuit 100 includes a bidirectional dc-dc conversion circuit 20, a collection circuit 50, and a controller 60.

The bidirectional dc-dc conversion circuit 20 comprises a first dc port 21 for transmitting a first dc current and a second dc port 22 for transmitting a second dc current, the bidirectional dc-dc conversion circuit 20 being adapted to effect a mutual conversion between the first dc current and the second dc current. The first dc port 21 is used for supplying power to a load device 200, the second dc port 22 is used for electrically connecting with the tank circuit 40, and the second dc port 22 is used for outputting the second dc power to the tank circuit 40 to charge the tank circuit 40 or receiving the second dc power output by the tank circuit 40 to discharge the tank circuit 40. Alternatively, the tank circuit 40 may be provided in the power supply circuit 100, or may be independent of the power supply circuit 100.

The acquisition circuit 50 is electrically connected to the tank circuit 40 and the controller 60, respectively, and the controller 60 is also electrically connected to the bidirectional dc-dc converter circuit 20. The acquisition circuit 50 is configured to acquire an operation parameter of the tank circuit 40 during charging or discharging, obtain a corresponding detection signal, and output the detection signal to the controller 60. The controller 60 enables or disables the bi-directional dc-dc conversion circuit 20 according to the detection signal, so that the tank circuit 40 can be charged/discharged or the tank circuit 40 is disabled from being charged/discharged.

The power supply circuit 100 provided by the utility model acquires the operation parameters of the energy storage circuit 40 during charging or discharging to obtain corresponding detection signals, and enables or disables the bidirectional direct current-direct current conversion circuit 20 according to the detection signals through the controller 60, so that the energy storage circuit 40 can be charged/discharged, or the energy storage circuit 40 cannot be charged/discharged, namely, the bidirectional direct current-direct current conversion circuit 20 is reused as a protection circuit of the energy storage circuit 40, thereby improving the utilization rate of equipment, reducing the number of elements, simplifying devices, saving space and reducing cost.

Optionally, in some embodiments, the bi-directional dc-dc conversion circuit 20 is used as a protection circuit for the tank circuit 40, so that a battery management system (Battery Management System, BMS) may not be separately provided for the tank circuit 40, thereby further reducing the number of components, simplifying the device, saving space, and reducing cost.

Further, the power supply circuit 100 further includes a bi-directional ac-dc conversion circuit 10. The bidirectional ac-dc conversion circuit 10 includes a third dc port 12 and a first ac port 11, the third dc port 12 is used for transmitting the first dc power, the first ac port 11 is used for transmitting the first ac power, and the bidirectional ac-dc conversion circuit 10 is used for implementing the mutual conversion between the first ac power and the first dc power.

Further, the power supply circuit 100 further includes a dc-ac conversion circuit 30. The dc-ac conversion circuit 30 includes a second ac port 31 and a fourth dc port 32, the second ac port 31 is electrically connected to the load device 200, the fourth dc port 32 is electrically connected to the first dc port 21 and the third dc port 12, respectively, the dc-ac conversion circuit 30 is configured to receive the first dc power through the fourth dc port 32, convert the first dc power into a second ac power, and output the second ac power through the second ac port 31 to drive the load device 200 to operate.

Illustratively, the dc-ac conversion circuit 30 includes a three-phase inverter, and the load device 200 includes an air-conditioning compressor. In other embodiments, the power supply circuit 100 may not include the dc-ac conversion circuit 30, and the load device 200 is a dc load and is directly electrically connected to the first dc port 21.

It should be noted that, in the embodiment of the present utility model, enabling the bidirectional dc-dc conversion circuit 20 includes controlling the bidirectional dc-dc conversion circuit 20 to operate in a rectifying mode (i.e., receiving the first ac power through the first ac port 11 and converting the first ac power into the first dc power and outputting the first dc power through the third dc port 12), or controlling the bidirectional dc-dc conversion circuit 20 to operate in an inverting mode (i.e., receiving the first dc power through the third dc port 12 and converting the first dc power into the first ac power and outputting the first ac power through the first ac port 11), and disabling the bidirectional dc-dc conversion circuit 20, i.e., controlling the bidirectional dc-dc conversion circuit 20 not to operate.

Further, when the bidirectional dc-dc conversion circuit 20 is enabled, the operation mode of the power supply circuit 100 includes a charging mode and a discharging mode.

As shown in fig. 2, when the power supply circuit 100 is in the charging mode, the first ac power includes ac power provided by the power grid 400. The power grid 400, the bidirectional ac-dc conversion circuit 10, and the bidirectional dc-dc conversion circuit 20 form a charging circuit for charging the tank circuit 40, and the charging circuit converts the ac power supplied from the power grid 400 into the second dc power and outputs the second dc power to the tank circuit 40, so that the tank circuit 40 receives the second dc power to charge.

As shown in fig. 3, when the power supply circuit 100 is in the discharging mode, the tank circuit 40, the bidirectional dc-dc conversion circuit 20, and the dc-ac conversion circuit 30 form a first driving circuit for driving the load device 200 to operate, the tank circuit 40 outputs the second dc power to the first driving circuit to discharge, and the first driving circuit converts the second dc power into the second ac power to output to the load device 200, so that the load device 200 receives the second ac power to operate.

In the embodiment of the present utility model, when the power grid 400 is in the electricity consumption low-peak period, the power supply circuit 100 is enabled to operate in the charging mode to charge the energy storage circuit 40, and when the power grid 400 is in the electricity consumption peak period, the power supply circuit 100 is enabled to operate in the discharging mode, so that the energy storage circuit 40 discharges to drive the load device 200 to operate, that is, the power is taken from the power grid 400 in the electricity consumption low-peak period, the energy storage circuit 40 is used for supplying power in the electricity consumption peak period, and the power is not taken from the power grid 400, and because the electricity price in the electricity consumption peak period is higher than the electricity price in the electricity consumption low-peak period, the power supply circuit 100 provided by the embodiment of the present utility model drives the load device 200, so that the electricity consumption of a user in the electricity consumption peak period can be reduced, and further the peak electricity price income can be obtained, and the electricity charge can be saved for the user.

Optionally, the controller 60 is further electrically connected to the bi-directional ac-dc conversion circuit 10 and the dc-ac conversion circuit 30, respectively.

As shown in fig. 2, when the power supply circuit 100 is in the charging mode, the controller 60 is configured to control the bidirectional ac-dc conversion circuit 10 to convert the first ac power into the first dc power and output the first dc power to the bidirectional dc-dc conversion circuit 20, and control the bidirectional dc-dc conversion circuit 20 to convert the first dc power into the second dc power and output the second dc power to the tank circuit 40.

As shown in fig. 3, when the power supply circuit 100 is in the discharging mode, the controller 60 is configured to control the bidirectional dc-dc conversion circuit 20 to convert the second dc power output from the tank circuit 40 into the first dc power and output the first dc power to the dc-ac conversion circuit 30, and control the dc-ac conversion circuit 30 to convert the first dc power into the second ac power and output the second dc power to the load device 200.

In this way, the bidirectional ac-dc conversion circuit 10, the bidirectional dc-dc conversion circuit 20, and the dc-ac conversion circuit 30 share the controller 60, which can reduce the number of controllers, reduce the number of communication circuits between modules, reduce the system components, reduce the system size, reduce the cost, and improve the reliability of the circuit.

Alternatively, the controller 60 may be further configured to control the dc-ac conversion circuit 30 to convert the first dc power to the second ac power and output the second ac power to the load device 200 when the power supply circuit 100 is in the charging mode. Specifically, the power grid 400, the bidirectional ac-dc conversion circuit 10, and the dc-ac conversion circuit 30 may also form the third driving circuit that drives the load device 200 to operate, that is, the third driving circuit obtains electric energy from the power grid 400 to drive the load device 200 to operate.

Optionally, the acquisition circuit 50 includes at least one of a current acquisition circuit, a voltage acquisition circuit, and a temperature acquisition circuit. The current collection circuit is configured to collect the charge/discharge current of the tank circuit 40, and obtain a corresponding current detection signal. The voltage acquisition circuit is used for acquiring the charge/discharge voltage of the energy storage circuit 40 to obtain a corresponding voltage detection signal. The temperature acquisition circuit is used for acquiring the temperature of the energy storage circuit 40 to obtain a corresponding temperature detection signal. The detection signal output from the acquisition circuit 50 to the controller 60 includes at least one of the voltage detection signal, the current detection signal, and the temperature detection signal.

The controller 60 disables the bidirectional dc to dc conversion circuit 20 when the signal value of the voltage detection signal is not within a preset voltage range, or when the signal value of the current detection signal is higher than a preset current threshold, or when the signal value of the temperature detection signal is higher than a preset temperature threshold. Illustratively, the tank circuit 40 includes at least one Battery cell connected in parallel and/or in series to form a Battery Module (BM). For example, as shown in fig. 5, the tank circuit 40 includes 4 series-connected cells, each of which has a rated voltage of 12.8V, for example. The voltage detection signal may include a voltage detection signal corresponding to each battery cell, and the controller 60 disables the dc-dc conversion circuit 20 when the voltage of the single battery cell is higher than a preset upper limit value of the battery cell voltage or when the temperature value of the single battery cell is higher than a preset temperature threshold value.

Optionally, the acquisition circuit 50 is further electrically connected to the first dc port 21, and the acquisition circuit 50 is further configured to detect a voltage and/or a current of the first dc port 21. The controller 60 is further configured to control the operation state of the bi-directional ac-dc conversion circuit 10 according to the voltage and/or current of the first dc port 21 when the power supply circuit 100 is in the charging mode, specifically, the controller 60 is configured to control the bi-directional ac-dc conversion circuit 10 not to operate when the first dc port 21 has an overvoltage, undervoltage, overcurrent or short-circuit condition. The controller 60 is further configured to control the operation state of the bidirectional dc-dc conversion circuit 20 according to the voltage and/or current of the first dc port 21 when the power supply circuit 100 is in the discharging mode, specifically, the controller 60 is configured to disable the bidirectional dc-dc conversion circuit 20 when the first dc port 21 has an overvoltage, undervoltage, overcurrent or short circuit condition.

Optionally, the acquisition circuit 50 is further electrically connected to the second dc port 22, and the acquisition circuit 50 is further configured to detect a voltage and/or a current of the second dc port 22. The controller 60 is further configured to control the operation state of the dc-ac conversion circuit 30 according to the voltage and/or current of the second dc port 22 when the power supply circuit 100 is in the discharging mode, specifically, the controller 60 is configured to control the dc-ac conversion circuit 30 not to operate when the second dc port 22 has an overvoltage, undervoltage, overcurrent or short-circuit condition.

Optionally, the power supply circuit 100 further includes a power interface 70, a switching circuit S1, and a power output interface 80, where the power interface 70 is configured to receive ac power provided by the power grid 400.

The switch circuit S1 includes a first connection port S11 and a second connection port S12, the first connection port S11 is electrically connected to the power interface 70, the second connection port S12 is electrically connected to the first ac port 11 and the power output interface 80, respectively, and the power output interface 80 is configured to provide the first ac power to the external ac device 300. As shown in fig. 2, the switching circuit S1 is turned on when the power supply circuit 100 is in the charging mode. As shown in fig. 3, the switching circuit S1 is turned off when the power supply circuit 100 is in the discharging mode, and at this time, the tank circuit 40, the dc-dc conversion circuit 20, the bidirectional ac-dc conversion circuit 10, and the power output interface 80 may constitute a power output circuit to supply power to the external ac device 300. In this way, during the peak electricity consumption period, the energy storage circuit 40 may be used to supply power without taking electricity from the power grid 400, so that the electricity consumption of the user during the peak electricity consumption period can be further reduced, and the peak-valley electricity price benefit can be obtained, so as to save the electricity charge for the user.

Optionally, the controller 60 is further electrically connected to the switch circuit S1, and the controller 60 is configured to control the switch circuit S1 to be turned on or turned off. Thus, the integration level of the system can be further improved.

Optionally, the power output interface 80 includes a socket output interface and/or a USB output interface.

Optionally, the power supply circuit 100 further includes a photovoltaic module 90 and a photovoltaic control circuit 91, and the photovoltaic control circuit 91 is electrically connected between the fourth dc port 32 and the photovoltaic module 90. The operation mode of the power supply circuit 100 further includes a power generation mode.

As shown in fig. 4, when the power supply circuit 100 is in the power generation mode, the photovoltaic module 90, the photovoltaic control circuit 91, and the dc-ac conversion circuit 30 form a second driving circuit for driving the load device 200 to operate, where the photovoltaic module 90 is configured to convert received solar energy into electrical energy and output the electrical energy to the photovoltaic control circuit 91, and the photovoltaic control circuit 91 is configured to convert the electrical energy output by the photovoltaic module 90 to obtain the first dc and output the first dc to ac conversion circuit 30. The dc-ac conversion circuit 30 converts the first dc power into the first ac power to drive the load device 200 to operate.

Further, when the power generation amount of the photovoltaic module 90 is large, the power supply circuit 100 may further return surplus power other than the power required by the load device 200 to the power grid 400, and/or charge the tank circuit 40, and/or supply power to the external ac device 300. Thus, a better energy-saving effect can be achieved.

Further, referring to fig. 5, fig. 5 is a schematic circuit diagram of the power supply circuit 100.

The bidirectional ac-dc conversion circuit 10 may adopt a bidirectional totem pole type full bridge PFC topology to implement bidirectional conversion between the first ac and the first dc.

Further, the bidirectional dc-dc conversion circuit 20 may employ a bidirectional full-bridge LLC topology, and of course, in other embodiments, the bidirectional dc-dc conversion circuit 20 may employ a bidirectional half-bridge, a bidirectional push-pull topology, or the like.

Specifically, in the embodiment of the present utility model, the bidirectional dc-dc conversion circuit 20 further includes a first converter 201, a second converter 202, and a transformer 203, where a dc port of the first converter 201 is electrically connected to the first dc port 21, and an ac port of the first converter 201 is electrically connected to a first winding of the transformer 203. The dc port of the second inverter 202 is electrically connected to the second dc port 22, and the ac port of the second inverter 202 is electrically connected to the second winding of the transformer 203.

The first converter 201 is configured to convert a first direct current received by the first direct current port 21 into an alternating current, transmit the alternating current to a first winding of the transformer 203, and convert the alternating current to the second converter 202 through the transformer 203; alternatively, the alternating current from the second inverter 202 is converted into the first direct current and output through the first direct current port 21.

The second converter 202 is configured to convert the second direct current received by the second direct current port 22 into an alternating current, transmit the alternating current to the second winding of the transformer 203, and convert the alternating current to the first converter 201 through the transformer 203; alternatively, the alternating current from the first inverter 201 is converted into the second direct current, and the second direct current is output to the tank circuit 40 through the second direct current port 22.

Wherein the two windings of the transformer 203 may be selected to have a suitable number of turns to achieve the switching between the first direct current and the second direct current.

Further, in the embodiment of the present utility model, the dc-ac conversion circuit 30 may employ a three-phase inverter bridge composed of 6 IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistors) for converting the first dc power into the second ac power.

Illustratively, the voltage provided by the power grid 400 is 220V mains, the voltage of the first direct current is 300V, and the voltage of the second direct current is 48V.

Optionally, the power supply circuit 100 further includes a power interface 70 and a transformer circuit 110, where the transformer circuit 110 includes a primary port and a secondary port, the primary port is electrically connected to the power interface 70, and the secondary port is electrically connected to the first ac port 11.

When the power supply circuit 100 is in the charging mode, the power interface 70 is configured to receive the ac power provided by the power grid 400, and the transformer circuit 110 receives the ac power provided by the power grid 400 through the primary port, transforms the ac power provided by the power grid 400 to obtain the first ac power, and outputs the first ac power to the first ac port 11 through the secondary port. The transformer circuit 110 is a transformer. In this way, not only transformation can be realized, but also the power grid 400 can be electrically isolated from other devices in the power supply circuit 100, and the safety of the power supply circuit 100 can be improved.

Optionally, the power supply circuit 100 further includes a PWM (Pulse Width Moudulation, pulse width modulation) module 101 and driving modules 102-108, wherein the PWM module 101 is electrically connected to the controller 60. The controller 60 is configured to output a control signal to the PWM module 101, control the PWM module 101 to output corresponding PWM signals to the driving modules 102 to 108, and further drive the bidirectional ac-dc conversion circuit 10, the bidirectional dc-dc conversion circuit 20, and the dc-ac conversion circuit 30, that is, the controller 60 controls the operating states of the bidirectional ac-dc conversion circuit 10, the bidirectional dc-dc conversion circuit 20, and the dc-ac conversion circuit 30 through the PWM module 101 and the driving modules 102 to 108. Specifically, the driving module 102, the driving module 103, the driving module 104, and the driving module 105 are configured to drive the bidirectional dc-dc conversion circuit 20, the driving module 106 and the driving module 107 are configured to drive the bidirectional ac-dc conversion circuit 10, and the driving module 108 is configured to drive the dc-ac conversion circuit 30.

Alternatively, the bidirectional ac-dc conversion circuit 10, the bidirectional dc-dc conversion circuit 20, the dc-ac conversion circuit 30, the acquisition circuit 50, and the controller 60 may be integrated into one circuit module, so that the bidirectional ac-dc conversion circuit 10, the bidirectional dc-dc conversion circuit 20, and the dc-ac conversion circuit 30 may share the controller 60, thereby realizing fewer system components, smaller system volume, lighter system weight, and lower system cost.

The controller 60 in the above embodiments may be a general purpose processor, a digital signal processor (digital signal processing, DSP), a microprocessor or a microcontroller, and may further include an application specific integrated circuit (application specific integratedcircuit, ASIC), a field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, for example.

Referring again to fig. 1, based on the same concept, the present utility model also provides an air conditioner 1, where the air conditioner 1 includes the power supply circuit 100 in any one of the above embodiments and a load device 200, and the load device 200 is electrically connected to the power supply circuit 100. The power supply circuit 100 is at least used for driving the load device 200 to operate.

The power supply circuit 100 includes a bidirectional ac-dc conversion circuit 10, a bidirectional dc-dc conversion circuit 20, a dc-ac conversion circuit 30, a tank circuit 40, a collection circuit 50, and a controller 60.

The bi-directional ac-dc conversion circuit 10 comprises a third dc port 12 for transmitting a first dc power and a first ac port 11 for transmitting a first ac power, the bi-directional ac-dc conversion circuit 10 being adapted to effect a mutual conversion between the first ac power and the first dc power.

The bidirectional dc-dc conversion circuit 20 includes a first dc port 21 and a second dc port 22, the first dc port 21 is electrically connected to the third dc port 12, the first dc port 21 is used for transmitting the first dc, the second dc port 22 is used for transmitting the second dc, and the bidirectional dc-dc conversion circuit 20 is used for implementing the mutual conversion between the first dc and the second dc.

The dc-ac conversion circuit 30 includes a second ac port 31 and a fourth dc port 32, the second ac port 31 is electrically connected to the load device 200, the fourth dc port 32 is electrically connected to the first dc port 21 and the second dc port 22, respectively, the dc-ac conversion circuit 30 is configured to receive the first dc power through the fourth dc port 32, convert the first dc power into a second ac power, and output the second ac power through the second ac port 31 to drive the load device 200 to operate.

The tank circuit 40 is electrically connected to the second dc port 22, and the tank circuit 40 is configured to receive the second dc power output from the second dc port 22 and charge the battery, or output the second dc power to the second dc port 22 and discharge the battery.

The acquisition circuit 50 is electrically connected to the tank circuit 40 and the controller 60, respectively, and the controller 60 is also electrically connected to the bidirectional dc-dc converter circuit 20. The acquisition circuit 50 is configured to acquire an operation parameter of the tank circuit 40 during charging or discharging, obtain a corresponding detection signal, and output the detection signal to the controller 60. The controller 60 enables or disables the bi-directional dc-dc conversion circuit 20 according to the detection signal so that the tank circuit 40 can be charged/discharged or so that the tank circuit 40 cannot be charged/discharged.

The air conditioning apparatus 1 may be a wall-mounted air conditioning apparatus, a central air conditioning system, etc., and the load apparatus 200 may be an air conditioning compressor.

According to the air conditioning equipment 1 provided by the utility model, the operation parameters of the energy storage circuit 40 during charging or discharging are collected through the collection circuit 50 to obtain corresponding detection signals, and the controller 60 enables or disables the bidirectional direct current-direct current conversion circuit 20 according to the detection signals, so that the energy storage circuit 40 can be charged/discharged, or the energy storage circuit 40 cannot be charged/discharged, namely, the bidirectional direct current-direct current conversion circuit 20 is reused as a protection circuit of the energy storage circuit 40, thereby improving the utilization rate of the equipment, reducing the number of elements, simplifying devices, saving space and reducing cost.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (9)

1. A power supply circuit, the power supply circuit comprising:

the bidirectional direct current-direct current conversion circuit comprises a first direct current port used for transmitting a first direct current and a second direct current port used for transmitting a second direct current, and is used for realizing the mutual conversion between the first direct current and the second direct current; the first direct current port is used for supplying power to a load device, the second direct current port is used for being electrically connected with the energy storage circuit, and the second direct current port is used for outputting the second direct current to the energy storage circuit so as to charge the energy storage circuit, or receiving the second direct current output by the energy storage circuit so as to discharge the energy storage circuit;

the acquisition circuit is electrically connected with the energy storage circuit and the controller respectively, and the controller is also electrically connected with the bidirectional direct current-direct current conversion circuit; the acquisition circuit is used for acquiring the operation parameters of the energy storage circuit during charging or discharging to obtain corresponding detection signals, and outputting the detection signals to the controller; the controller enables or disables the bidirectional DC-DC conversion circuit according to the detection signal so that the energy storage circuit can be charged/discharged or the energy storage circuit is disabled from being charged/discharged; and

the bidirectional alternating current-direct current conversion circuit comprises a third direct current port and a first alternating current port, wherein the third direct current port is used for transmitting the first direct current, the first alternating current port is electrically connected with a power grid and used for transmitting the first alternating current, and the bidirectional alternating current-direct current conversion circuit is used for realizing the mutual conversion between the first alternating current and the first direct current.

2. The power supply circuit of claim 1, wherein the power supply circuit further comprises:

the direct current-alternating current conversion circuit comprises a second alternating current port and a fourth direct current port, the second alternating current port is electrically connected with the load equipment, the fourth direct current port is electrically connected with the first direct current port and the third direct current port respectively, and the direct current-alternating current conversion circuit is used for receiving the first direct current through the fourth direct current port, converting the first direct current into second alternating current and outputting the second alternating current through the second alternating current port to drive the load equipment to operate.

3. The power supply circuit of claim 2, wherein the operating modes of the power supply circuit include a charging mode and a discharging mode;

when the power supply circuit is in a charging mode, the first alternating current comprises alternating current provided by a power grid; the power grid, the bidirectional alternating current-direct current conversion circuit and the bidirectional direct current-direct current conversion circuit form a charging circuit for charging the energy storage circuit, and the charging circuit converts alternating current provided by the power grid into second direct current and outputs the second direct current to the energy storage circuit, so that the energy storage circuit receives the second direct current for charging;

when the power supply circuit is in a discharging mode, the energy storage circuit, the bidirectional direct current-direct current conversion circuit and the direct current-alternating current conversion circuit form a first driving circuit for driving the load equipment to operate, the energy storage circuit outputs the second direct current to the first driving circuit to discharge, and the first driving circuit converts the second direct current into the second alternating current and outputs the second alternating current to the load equipment, so that the load equipment receives the second alternating current to operate.

4. A power supply circuit as claimed in claim 2 or 3, wherein the acquisition circuit comprises at least one of a current acquisition circuit, a voltage acquisition circuit and a temperature acquisition circuit; the current acquisition circuit is used for acquiring charge/discharge current of the energy storage circuit to obtain a corresponding current detection signal; the voltage acquisition circuit is used for acquiring charge/discharge voltage of the energy storage circuit to obtain a corresponding voltage detection signal; the temperature acquisition circuit is used for acquiring the temperature of the energy storage circuit and obtaining a corresponding temperature detection signal; the detection signal output by the acquisition circuit to the controller comprises at least one of the voltage detection signal, the current detection signal and the temperature detection signal;

the controller disables the bidirectional DC-DC conversion circuit when the signal value of the voltage detection signal is not within a preset voltage range, or when the signal value of the current detection signal is higher than a preset current threshold, or when the signal value of the temperature detection signal is higher than a preset temperature threshold.

5. The power supply circuit of claim 3, wherein the controller is further electrically connected to the bi-directional ac-to-dc conversion circuit and the dc-to-ac conversion circuit, respectively;

when the power supply circuit is in a charging mode, the controller is used for controlling the bidirectional alternating current-direct current conversion circuit to convert the first alternating current into the first direct current and output the first direct current to the bidirectional direct current-direct current conversion circuit, and controlling the bidirectional direct current-direct current conversion circuit to convert the first direct current into the second direct current and output the second direct current to the energy storage circuit;

when the power supply circuit is in a discharging mode, the controller is used for controlling the bidirectional direct current-direct current conversion circuit to convert the second direct current output by the energy storage circuit into the first direct current and output the first direct current to the direct current-alternating current conversion circuit, and controlling the direct current-alternating current conversion circuit to convert the first direct current into the second alternating current and output the second alternating current to the load equipment.

6. The power supply circuit of claim 3, further comprising a power interface and a transformer circuit, wherein the transformer circuit comprises a primary port and a secondary port, the primary port being electrically connected to the power interface, the secondary port being electrically connected to the first ac port;

when the power supply circuit is in a charging mode, the power supply interface is used for receiving alternating current provided by a power grid, the transformation circuit receives the alternating current provided by the power grid through the primary side port, transforms the alternating current provided by the power grid to obtain the first alternating current, and outputs the first alternating current to the first alternating current port through the secondary side port.

7. The power supply circuit of claim 3, further comprising a photovoltaic module and a photovoltaic control circuit, the photovoltaic control circuit electrically connected between the fourth dc port and the photovoltaic module; the working mode of the power supply circuit also comprises a power generation mode;

when the power supply circuit is in a power generation mode, the photovoltaic module, the photovoltaic control circuit and the direct current-alternating current conversion circuit form a second driving circuit for driving the load equipment to operate, wherein the photovoltaic module is used for converting received solar energy into electric energy and outputting the electric energy to the photovoltaic control circuit, and the photovoltaic control circuit is used for converting the electric energy output by the photovoltaic module to obtain the first direct current and outputting the first direct current to the direct current-alternating current conversion circuit; the direct current-alternating current conversion circuit converts the first direct current into the first alternating current to drive the load equipment to operate.

8. The power supply circuit of claim 7, wherein the power supply circuit further comprises:

the power interface is used for receiving alternating current provided by a power grid; and

the switching circuit comprises a first connecting port and a second connecting port, the first connecting port is electrically connected with the power interface, the second connecting port is electrically connected with the first alternating current port and the electric energy output interface respectively, and the electric energy output interface is used for providing the first alternating current for external alternating current equipment; the switching circuit is turned on when the power supply circuit is in a charging mode and turned off when the power supply circuit is in a discharging mode.

9. An air conditioning apparatus, comprising:

the power supply circuit of any one of claims 1-8; and

the air conditioner compressor is electrically connected with the power supply circuit; the power supply circuit is at least used for driving the air conditioner compressor to operate.