CN218549574U - Power supply switching control system and refrigerating unit - Google Patents
Power supply switching control system and refrigerating unit Download PDFInfo
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- CN218549574U CN218549574U CN202222966952.1U CN202222966952U CN218549574U CN 218549574 U CN218549574 U CN 218549574U CN 202222966952 U CN202222966952 U CN 202222966952U CN 218549574 U CN218549574 U CN 218549574U
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Abstract
The utility model discloses a mains operated switching control system and refrigerating unit, mains operated switching control system includes one and is used for providing direct current's DC power supply system, one for treating power supply unit provides alternating current's alternating current supply system and one and connects DC power supply system and alternating current supply system's display control unit, display control unit can switch according to mains operated switching control system's input power type DC power supply system and alternating current supply system's operating condition. Compared with the prior art, the utility model discloses can make alternating current power supply and DC power supply timesharing for the unit power supply, guarantee the reliability of unit, and under alternating current power supply, DC power supply does not practice thrift direct current battery power for the unit power supply, can increase continuation of the journey mileage to the transport means who relies on direct current power supply.
Description
Technical Field
The utility model relates to a refrigeration field, especially a power supply switching control system and refrigerating unit.
Background
The refrigerating unit of the traditional commercial refrigeration house adopts a single-phase or three-phase alternating current power supply mode, the machine position is fixed and cannot be moved, the transportation of frozen goods needs the movable refrigerating unit to refrigerate and keep the frozen state of the goods, a plurality of refrigerating units which rely on the power supply of new energy automobiles are continuously appeared in the market at present, namely, new energy refrigerated vehicles with the refrigerating function are provided, the refrigerating unit of the new energy refrigerated vehicles adopts vehicle-mounted direct current high-voltage batteries for power supply, and the refrigerating unit which relies on the power supply of the high-voltage batteries is not limited to be used on the automobiles and can also be used on other transportation tools for transporting the frozen goods, such as small goods transport ships and the like. Because the electric quantity of the direct current power supply battery is limited, and the electricity consumption of the refrigerating unit is more, the problems that the power supply of the refrigerating unit is continuous and reliable and the electric quantity of the battery is saved are very important, the stable state of goods is guaranteed, and the long-distance operation of a transport tool is guaranteed.
In order to reduce the electric energy consumption of the battery by the unit, if an alternating current power supply can be connected into the unit to supply power to the unit when a ship is landed or a new energy refrigerator car is parked under the condition of alternating current commercial power, the electric energy consumption of a direct current supply battery or a vehicle-mounted battery of a transport ship can be reduced, and the electric energy consumption of the battery is greatly improved particularly for the running mileage of the refrigerator car.
Therefore, how to design a power supply switching control system and a refrigeration unit can reduce the power consumption of a transport ship dc supply battery or a vehicle-mounted battery, which is a technical problem to be solved urgently in the industry.
SUMMERY OF THE UTILITY MODEL
To among the prior art, direct current power supply battery electric quantity is limited, can influence the stable problem of goods in the refrigerating unit, the utility model provides a mains operated switching control system and refrigerating unit.
The technical scheme of the utility model for, a mains operated switching control system is proposed, including one be used for providing direct current DC power supply system, one be used for doing for waiting to supply apparatus the AC power supply system and one of alternating current supply system and the connection of waiting to supply apparatus the display control unit of DC power supply system and AC power supply system, display control unit can switch according to mains operated switching control system's input power type DC power supply system and AC power supply system's operating condition.
Further, the direct current power supply system comprises a first direct current power supply circuit used for supplying power to equipment to be powered, and the first direct current power supply circuit comprises a first direct current relay, a second direct current relay, a third direct current relay and a pre-charging resistor;
one end of the second direct current relay and one end of the third direct current relay are connected to the output end of a direct current power supply, the other end of the second direct current relay and the other end of the third direct current relay are connected to the equipment to be powered, and the first direct current relay and the pre-charging resistor are connected in series and then connected to the two ends of the second direct current relay in parallel.
Further, when the type of the input power supply is a direct current power supply and the equipment to be powered is in a pre-charging stage, the display control unit controls the first direct current relay and the third direct current relay to be conducted;
when the type of the input power supply is a direct-current power supply and the equipment to be powered is normally powered on, the display control unit controls the second direct-current relay and the third direct-current relay to be conducted.
Furthermore, the direct current power supply system also comprises a second direct current power supply circuit which is connected with the display control unit and supplies power, and a first output detection circuit which is used for outputting a detection signal capable of detecting the voltage of the direct current power supply.
Further, the alternating current power supply system comprises an alternating current power supply circuit for supplying power to the equipment to be powered and a second output detection circuit for outputting a detection signal capable of detecting the voltage of the alternating current power supply, wherein the alternating current power supply circuit comprises a first alternating current relay, a second alternating current relay and a rectifier bridge;
the first ends of the first alternating current relay and the second alternating current relay are connected to the output end of an alternating current power supply, the other ends of the first alternating current relay and the second alternating current relay are connected to the input end of the rectifier bridge, and the output end of the rectifier bridge is connected with the equipment to be powered.
Further, when the input power supply is an alternating current power supply and the display control unit is powered on through the direct current power supply, the display control unit controls the first alternating current relay and the second alternating current relay to be conducted.
Further, the display control unit includes:
the relay control circuit is used for controlling the on-off states of the first direct current relay, the second direct current relay, the third direct current relay, the first alternating current relay and the second alternating current relay so as to switch the power supply states of the direct current power supply system and the alternating current power supply system;
the detection signal input circuit is respectively connected with the first output detection circuit and the second output detection circuit and is used for acquiring the voltage of the direct current power supply and the voltage of the alternating current power supply;
the communication circuit is connected with equipment to be powered on and is used for communicating with the equipment to be powered on when the equipment to be powered on is powered on;
and the singlechip is respectively connected to the relay control circuit, the detection signal input circuit and the communication circuit and is used for controlling the working states of the relay control circuit, the detection signal input circuit and the communication circuit.
Further, when the input power supply is a direct-current power supply and an alternating-current power supply is connected, the display control unit controls the first direct-current relay, the second direct-current relay and the third direct-current relay to be disconnected, and controls the first alternating-current relay and the second alternating-current relay to be connected, so that the direct-current power supply system stops supplying power, and the alternating-current power supply system starts supplying power.
Furthermore, the display control unit further comprises a display circuit for displaying the working states of the direct current power supply system and the alternating current power supply system, and a temperature sensing circuit for detecting the temperature of the power supply switching control system.
The utility model also provides a refrigerating unit, refrigerating unit has above-mentioned mains operated switching control system.
Compared with the prior art, the utility model discloses following beneficial effect has at least:
the utility model provides a mains operated switched systems includes DC power supply system and AC power supply system, and DC power supply system and AC power supply system's power supply can switch, can realize the timesharing for the unit power supply, guarantees the reliability of unit operation. And under the AC power supply, the DC power supply does not supply power to the unit, so that the electric quantity of the DC battery is saved, and the endurance mileage of the transportation tool depending on the DC power supply can be increased.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
FIG. 1 is an overall control block diagram of the present invention;
fig. 2 is an internal composition diagram of the display control unit of the present invention;
fig. 3 is a schematic diagram of the dc power supply system of the present invention;
fig. 4 is a block diagram of the ac power supply system of the present invention;
the circuit comprises a display panel control unit 1, a low-voltage direct current input terminal 2, a voltage reduction circuit 3, a single chip microcomputer and other circuits 4, a display circuit 5, a relay signal output terminal 6, a relay control circuit 7, a detection signal input terminal 8, a detection signal input circuit 9, a communication signal input terminal 10, a communication circuit 11, a temperature sensing circuit 12, a direct current power supply system 13, a direct current input terminal 14, direct current relays 1 and 16, pre-charging resistors 17, direct current relays 2 and 18, a direct current output 1 terminal 19, a direct current output 2 terminal 20, a DC/DC module 21, a direct current output 2 terminal 22, a direct current detection unit 23, a detection signal output terminal 24, an alternating current power supply system 25, an alternating current input detection unit 26, a detection signal output terminal 27, alternating current relays 1 and 29, an alternating current relay 30, a rectifier bridge 31, and a direct current output terminal 31.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of an embodiment of the invention, and not to imply that every embodiment of the invention must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The principles and structure of the present invention will be described in detail below with reference to the drawings and examples.
Because the direct current power supply battery has limited electric quantity, and the refrigerating unit has more electric quantity, the problems of ensuring the continuous and reliable power supply of the refrigerating unit and saving the electric quantity of the battery are very important problems, the stable state of goods is ensured, and the long-distance operation of a transport tool is ensured. In order to reduce the power consumption of the unit to the battery, the utility model discloses an thinking lies in, provides a mains operated switching control system, and it includes DC power supply system and AC power supply system to the operating condition who switches DC power supply system and AC power supply system through the type of input power makes DC power supply system and AC power supply system can the timesharing power supply, and when the AC system power supply, DC system does not supply power, reaches the problem of practicing thrift the direct current electric quantity.
Referring to fig. 1, the power supply switching control system of the present invention includes a dc power supply system, an ac power supply system, and a display panel unit, wherein an input side of the dc power supply system is connected to a dc battery 1, and an output side of the dc power supply system is connected to a refrigerating unit control system, for providing dc power to the refrigerating unit control system;
the input side of the alternating current power supply system is connected to alternating current commercial power, and the output side of the alternating current power supply system is connected to the refrigerating unit control system and used for providing alternating current for the refrigerating unit control system;
the display panel control unit is respectively connected to the direct current power supply system, the alternating current power supply system and the refrigerating unit control system and used for adjusting the working states of the direct current power supply system and the alternating current power supply system according to the type of the input power supply.
Here input power source includes direct current and alternating current, and the direct current is the direct current battery in figure 1, and the alternating current is the alternating current commercial power in figure 1, treats that power supply unit is refrigerating unit control system, and in the transport, direct current battery 1 is invariably to be located in the refrigerating unit, and alternating current power supply can select to insert according to the berth of transport, for the energy of saving direct current battery 1, the utility model discloses in through the type that detects input power source, whether have the alternating current to switch direct current power supply system and alternating current power supply system's operating condition promptly, realize the timesharing power supply control of direct current power supply system and alternating current power supply system.
The direct current power supply system comprises a first direct current power supply circuit used for supplying power to equipment to be powered, wherein the first direct current power supply circuit comprises a first direct current relay, a second direct current relay, a third direct current relay and a pre-charging resistor;
one end of the second direct current relay and one end of the third direct current relay are connected to the output end of the direct current power supply, the other end of the second direct current relay and the third direct current relay are connected to the equipment to be powered, and the first direct current relay is connected with the pre-charging resistor in series and then connected to the two ends of the second direct current relay in parallel.
Referring to fig. 3, the first dc relay is the dc relay 1 (15) in fig. 3, the second dc relay is the dc relay 2 (17) in fig. 3, the third dc relay is the dc relay 3 (19) in fig. 3, and the three dc relays are all connected between the dc input (14) and the dc output 1 (18), so that the dc battery and the device to be powered can be connected after the relays are closed, and the display control unit can control the on-off states of the three relays, thereby adjusting the power supply state of the dc power supply system (13).
Here, when the type of the input power source is only a dc power source, under the pre-charging stage of the device to be powered, the display control unit may control the dc relay 1 (15) and the dc relay 3 (19) to be closed first to implement the pre-charging protection, and during normal power-on, the display control unit may control the dc relay 2 (17) and the dc relay 3 (19) to be closed to normally power-on the device to be powered.
Furthermore, the direct current power supply system also comprises a second direct current power supply circuit which is connected with the display control unit and supplies power, and a first output detection circuit which is used for outputting a detection signal capable of detecting the voltage of the direct current power supply.
Referring to fig. 3, the second DC power supply circuit is composed of a DC-DC module (20) and a DC output 2 (21), and is used for performing DC-DC conversion on the DC input (14) and converting the voltage into a voltage for the display control unit to work, as shown in fig. 1, the display panel control unit is further connected with a DC battery 2, and the part of electric energy is used as the DC battery 2 to supply power to the display panel control unit. Specifically, the working voltage of the display control unit is 12V or 24V, so that the DC-DC module (20) is used for converting the voltage of the direct current input (14) into 12V or 24V voltage.
The first output detection circuit is composed of a direct current detection unit (22) and a detection signal output (23), is used for acquiring the voltage of the detection direct current input (14) and transmitting the voltage to the display control unit through the detection signal output (23), and the display control unit is used for controlling the first direct current power supply circuit after judging whether the voltage is normal or not, so that power is supplied to the equipment to be powered, and the damage caused by voltage abnormity is avoided.
Furthermore, the alternating current power supply system comprises an alternating current power supply circuit for supplying power to the equipment to be powered and a second output detection circuit for outputting a detection signal capable of detecting the voltage of the alternating current power supply, wherein the alternating current power supply circuit comprises a first alternating current relay, a second alternating current relay and a rectifier bridge;
the first ends of the first alternating current relay and the second alternating current relay are connected to the output end of an alternating current power supply, the other ends of the first alternating current relay and the second alternating current relay are connected to the input end of a rectifier bridge, and the output end of the rectifier bridge is connected with a device to be powered.
Referring to fig. 4, the AC power supply circuit is composed of an AC relay 1 (28), an AC relay 2 (29), a rectifier bridge module (30), and a DC output (31), wherein the AC relay 1 (28) and the AC relay 2 (29) are both connected in series between the AC input (25) and the DC output (31), so that the display control unit can adjust the power-on state of the device to be powered by controlling the conduction states of the AC relay 1 (28) and the AC relay 2 (29), and the rectifier bridge module (30) is used for performing AC-DC conversion to convert AC power into DC power for the device to be powered to work.
The second output detection circuit consists of an alternating current input detection unit (26) and a detection signal output (27) and is used for detecting the magnitude of alternating current voltage and avoiding damage caused by voltage abnormity.
When the input power supply is determined to be an alternating current power supply, the display control unit controls the alternating current relay 1 (28) and the alternating current relay 2 (29) to be conducted, so that the equipment to be powered is powered on.
Further, the utility model provides a display control unit includes:
the relay control circuit is used for controlling the on-off states of the first direct current relay, the second direct current relay, the third direct current relay, the first alternating current relay and the second alternating current relay so as to switch the power supply states of the direct current power supply system and the alternating current power supply system;
the detection signal input circuit is respectively connected with the first output detection circuit and the second output detection circuit and is used for acquiring the voltage of the direct current power supply and the voltage of the alternating current power supply;
the communication circuit is connected with the equipment to be powered on and is used for communicating with the equipment to be powered on when the equipment to be powered on is powered on;
and the singlechip is respectively connected to the relay control circuit, the detection signal input circuit and the communication circuit and is used for controlling the working states of the relay control circuit, the detection signal input circuit and the communication circuit.
Referring to fig. 2, a relay signal input terminal (6) of the relay control circuit (7) is respectively connected to the dc power supply system (13) and the ac power supply system (24) and is used for controlling on/off states of the dc relay 1 (15), the dc relay 2 (17), the dc relay (19), the ac relay 1 (28) and the ac relay (29);
the detection signal input circuit (9) is provided with an alternating current/direct current detection signal input end (8) which is respectively connected to a detection signal output (23) of a direct current power supply system (15) and a detection signal output (27) of an alternating current power supply system (24) and is used for determining whether the input power supply is a direct current power supply or an alternating current power supply and the voltage magnitudes of the direct current power supply and the alternating current power supply;
the communication circuit (11) comprises a communication signal input and output end (10), and the communication signal input and output end (10) is connected to the equipment to be powered, and is used for communicating with the equipment to be powered and sending a corresponding control command after the equipment to be powered is powered on.
When the input power supply is a direct-current power supply and an alternating-current power supply is connected, the display control unit controls the first direct-current relay, the second direct-current relay and the third direct-current relay to be disconnected and controls the first alternating-current relay and the second alternating-current relay to be connected, so that the direct-current power supply system stops supplying power, and the alternating-current power supply system starts supplying power. Through the control, the utility model discloses when having the interchange input, stop the DC power supply to save DC power supply's energy.
Referring to fig. 2, the display control unit of the present invention further includes a display circuit for displaying the operating states of the dc power supply system and the ac power supply system, and a temperature sensing circuit for detecting the temperature of the power supply switching control system, so as to improve the reliability of the control.
Further, the display control unit further comprises a voltage reduction circuit (3) connected between the single chip microcomputer circuit and other circuits (4) and the low-voltage direct current input (2), the voltage reduction circuit is used for converting the voltage of the low-voltage direct current input (2) into the working voltage of the single chip microcomputer, specifically, the voltage reduction circuit (3) is used for converting 12V voltage or 24V voltage into 5V voltage or 3.3V voltage, and the low-voltage direct current input end (2) of the voltage reduction circuit is connected to the direct current output 2 (21) and used for obtaining electricity from the direct current power supply system (13) to supply the single chip microcomputer to work.
Wherein DC power supply's power supply can be for high voltage direct current or low pressure direct current, when inserting DC power supply for the low pressure direct current, then need not carry out DC-DC transform, combines AC power supply's input, the utility model discloses four mode have at least, it is right below respectively the utility model discloses a four mode explain:
referring to fig. 2 to 4, when the input power is completely high voltage DC, after the high voltage DC is connected to the DC power supply system (13), the DC-DC module (18) reduces the voltage to 12V or 24V, and then the DC output 2 (21) supplies power to the low voltage DC input terminal (2) in the display panel control unit (1), and then the voltage is reduced to 3.3V or 5V by the voltage reduction module (3), i.e. the voltage required by the single chip and other circuits (4), the single chip and other circuits (4) start to operate, meanwhile, after the high voltage DC is connected through the DC input terminal (14), the DC detection unit (22) starts to detect the DC voltage, and outputs the detection signal to the ac/DC signal input terminal (8) through the detection signal output terminal (23), and the detection signal input circuit transmits the working voltage to the single chip to determine whether the working voltage meets the unit working conditions, if the conditions are not met, the display circuit (5) may report corresponding prompt codes or text prompts, or the built-in buzzer circuit of the display panel to warn that the voltage is too low. If the voltage meets the starting condition, the single chip microcomputer controls the direct current relay 1 (15) and the direct current relay 3 (19) to be closed through the relay control circuit (7) to pre-charge the equipment to be powered, after pre-charge protection is finished, the single chip microcomputer controls the direct current relay 2 (17) and the direct current relay 3 (19) to be closed through the relay control circuit (7), the direct current relay 1 (15) is disconnected, and the equipment to be powered is powered on normally.
When the input voltage comprises high-voltage direct current and low-voltage direct current, because part of ships carry low-voltage 12V or 24V direct current batteries, and part of refrigerated vehicles also carry low-voltage 12V or 24V direct current batteries, for the transport means of the type, the high-voltage direct current batteries can be adopted to supply power for the refrigerating unit, and the low-voltage direct current batteries can supply power for the display panel, so that the unit can work, because the DC-DC module (20) is higher in cost and is a detachable module, for example, the ship-borne or vehicle-borne low-voltage batteries are adopted to supply power for the display panel, the part can be omitted, under the above power supply mode, the low-voltage 12V or 24V direct current batteries are connected into a low-voltage direct current input (2) and pass through a voltage reduction circuit (3) to provide working voltage for the display panel single chip microcomputer, after the display panel single chip microcomputer works, and after the batteries are connected into a direct current power supply system at the moment, the subsequent control mode is the same as the functions and logics of starting and shutting down under the condition that the high-voltage direct current power supply is completely adopted.
When alternating current is adopted to supply power to the unit, low-voltage direct current or high-voltage direct current is converted into low-voltage direct current through DC-DC to supply power to the display control unit, a high-voltage direct current battery is not connected into the unit, after the alternating current is connected into an alternating current power supply system (24), an alternating current detection unit (26) detects that the alternating current is connected through an alternating current input end (25), a detected alternating current signal is transmitted to an alternating current/direct current detection signal input end (8) of a display panel control unit (1) through a detection signal output end (27), and is transmitted to a single chip microcomputer of a display panel through a detection signal input circuit (9), at the moment, the single chip microcomputer of the display panel controls an alternating current relay 1 (28) and an alternating current relay 2 (29) to be closed through a relay control circuit (7), the alternating current can be connected into a rectifier bridge module (30), after rectification, the direct current is connected into a refrigerating unit control system through a direct current output end (31), the display panel can carry out a power-on instruction and the like to realize the functions of the unit, if the unit stops being connected, the unit can be shut down, the unit can be in a standby state by pressing a key of the display panel, if the two alternating current relays are directly connected into the alternating current relay, if the alternating current relay, the alternating current relay is disconnected, the display panel can be disconnected from the display panel to the display unit in a standby state, and the alternating current relay in a complete power supply system, and the alternating current relay (28, and the power supply system can be detected, and the alternating current relay (29) can be detected. When the alternating current is disconnected, the display circuit (5) displays the current unit state, and therefore the mode that the middle display panel controls a plurality of direct current power supplies can be automatically achieved when the high voltage power is connected into the direct current power supply system, and the unit is automatically started to supply power.
When a refrigerating unit works by using a high-voltage battery and the alternating current is suddenly switched on, an alternating current input detection unit (26) of an alternating current power supply system (24) sends a signal to a display panel through a detection signal output end (27), after a display panel single chip microcomputer receives the alternating current access signal, a unit shutdown instruction is executed firstly, after a standby unit is shut down, the display panel controls all direct current contactors of a direct current power supply system (13) to be disconnected, then a control signal of an alternating current relay is controlled to be sent out, the signal is sent to a relay signal output end (6) through a relay control circuit (7) to be sent to the alternating current power supply system (24), an alternating current relay 1 (28) and an alternating current relay 2 (29) of the alternating current power supply system (24) receive a closing control signal from the display panel, the two relays are closed, and the rectifier bridge realizes the working state that the rectified direct current is supplied to the refrigerating unit control system. The situation that the alternating current power supply is suddenly connected can be realized by adopting a power supply output by the DC-DC module (20) or a low-voltage battery for power supply of the display panel. If a high-voltage direct-current power supply mode is needed to be adopted again to supply power for the unit, the working condition that the high-voltage direct-current battery supplies power for the unit can be realized only by starting the display panel control unit (1).
The power supply mode adopting the alternating current access avoids the situation that alternating current and direct current supply power to the unit at the same time, automatic switching direct current and alternating current are realized by adopting a display panel detection and control mode, after alternating current is disconnected, if high voltage is connected into a direct current power supply system, the direct current power supply system is automatically started again to supply power to the refrigerating unit, the continuity of unit work is realized, and the phenomenon that the unit is forgotten to start to continue to work after the alternating current power supply is manually closed is avoided. And secondly, by the operation of the alternating current power supply system, the refrigerating unit can reduce the use of the electric energy of the shipborne and vehicle-mounted high-voltage batteries when the transport ship or the refrigerated truck is parked, so that other electric equipment such as an air conditioner on the ship or the truck can be used for a longer time, and the driving mileage of the refrigerated truck running by the high-voltage batteries can be increased.
The utility model also provides a refrigerating unit, refrigerating unit adopts above-mentioned mains operated switching control system.
Compared with the prior art, the utility model provides a mains operated switched systems includes DC power supply system and AC power supply system, and DC power supply system and AC power supply system's power supply can switch, can realize the timesharing for the unit power supply, guarantees the reliability of unit operation. And under the AC power supply, the DC power supply does not supply power to the unit, so that the electric quantity of the DC battery is saved, and the endurance mileage of the transportation tool depending on the DC power supply can be increased.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.
Claims (10)
1. The power supply switching control system is characterized by comprising a direct current power supply system for providing direct current for equipment to be powered, an alternating current power supply system for providing alternating current for the equipment to be powered, and a display control unit connected with the direct current power supply system and the alternating current power supply system, wherein the display control unit can switch the working states of the direct current power supply system and the alternating current power supply system according to the type of an input power supply of the power supply switching control system.
2. The system according to claim 1, wherein the dc power supply system comprises a first dc power supply circuit for supplying power to the device to be powered, the first dc power supply circuit comprising a first dc relay, a second dc relay, a third dc relay, and a pre-charging resistor;
one end of the second direct current relay and one end of the third direct current relay are connected to the output end of a direct current power supply, the other end of the second direct current relay and the other end of the third direct current relay are connected to the equipment to be powered, and the first direct current relay and the pre-charging resistor are connected in series and then connected to the two ends of the second direct current relay in parallel.
3. The system according to claim 2, wherein when the input power is a dc power and the device to be powered is in a pre-charging stage, the display control unit controls the first dc relay and the third dc relay to be turned on;
when the type of the input power supply is a direct-current power supply and the equipment to be powered is normally powered on, the display control unit controls the second direct-current relay and the third direct-current relay to be conducted.
4. The power supply switching control system of claim 2, wherein the dc power supply system further comprises a second dc power supply circuit connected to the display control unit for supplying power, and a first output detection circuit for outputting a detection signal capable of detecting the magnitude of the dc power supply voltage.
5. The power supply switching control system according to claim 1, wherein the ac power supply system comprises an ac power supply circuit for supplying power to the device to be powered, and a second output detection circuit for outputting a detection signal capable of detecting the magnitude of the ac power supply voltage, wherein the ac power supply circuit comprises a first ac relay, a second ac relay, and a rectifier bridge;
the first ends of the first alternating current relay and the second alternating current relay are connected to the output end of an alternating current power supply, the other ends of the first alternating current relay and the second alternating current relay are connected to the input end of the rectifier bridge, and the output end of the rectifier bridge is connected with the equipment to be powered.
6. A power supply switching control system according to claim 5, wherein when the input power supply is an AC power supply and the display control unit is powered on by a DC power supply, the display control unit controls the first AC relay and the second AC relay to be conducted.
7. The power supply switching control system according to claim 4, wherein the display control unit comprises:
the relay control circuit is used for controlling the on-off states of the first direct current relay, the second direct current relay, the third direct current relay, the first alternating current relay and the second alternating current relay so as to switch the power supply states of the direct current power supply system and the alternating current power supply system;
the detection signal input circuit is respectively connected with the first output detection circuit and the second output detection circuit and is used for acquiring the voltage of the direct current power supply and the voltage of the alternating current power supply;
the communication circuit is connected with equipment to be powered on and is used for communicating with the equipment to be powered on when the equipment to be powered on is powered on;
and the singlechip is respectively connected to the relay control circuit, the detection signal input circuit and the communication circuit and is used for controlling the working states of the relay control circuit, the detection signal input circuit and the communication circuit.
8. The power supply switching control system according to claim 7, wherein when the input power supply is a dc power supply and an ac power supply is turned on, the display control unit controls the first dc relay, the second dc relay, and the third dc relay to be turned off, and controls the first ac relay and the second ac relay to be turned on, so that the dc power supply system stops supplying power and the ac power supply system starts supplying power.
9. The system of claim 7, wherein the display control unit further comprises a display circuit for displaying the operating status of the dc power supply system and the ac power supply system, and a temperature sensing circuit for detecting the temperature of the system.
10. Refrigeration unit, characterized in that it has a mains-powered switching control system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222966952.1U CN218549574U (en) | 2022-11-07 | 2022-11-07 | Power supply switching control system and refrigerating unit |
Applications Claiming Priority (1)
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| CN202222966952.1U CN218549574U (en) | 2022-11-07 | 2022-11-07 | Power supply switching control system and refrigerating unit |
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