Multi-power-source power supply system and method

Abstract

Disclosed in the present invention are a multi-power-source power supply system and method. A first relay is provided to connect to a control unit, an external alternating-current power supply side and an internal alternating-current power supply side, and a signal end of the first relay is controlled by means of the control unit, so as to drive a normally closed input end and a normally open input end of the first relay to be in an open / closed state, such that the connection of the external alternating-current power supply side and the connection of the internal alternating-current power supply side can be controlled, and on this basis, the external alternating-current power supply side or the internal alternating-current power supply side is selected to perform a power supply output on a direct-current power supply unit. On this basis, the present invention realizes the arbitrary switching between and the arbitrary control over power supply modes of an alternating-current power supply unit by means of soft switching, avoids physical isolation, and effectively improves the flexibility of switching between power supply modes.

Description

Multi-power supply system and method Technical Field

[0001] The present invention relates to the technical field of power supply control, and in particular to a multi-power supply system and method. Background Art

[0002] Currently, PCS (Power Conversion System) converters include three power supply modes: DC (Direct Current) power supply, AC (Alternating Current) internal power supply, and AC external power supply.

[0003] Because high-power PCS converters primarily utilize a three-phase, three-wire system, the internal AC power supply utilizes a transformer that converts line voltage into phase voltage. However, due to inconsistencies in amplitude, phase, and frequency, the external AC voltage and the internal AC voltage cannot be used simultaneously. Physical isolation is required for foolproof protection (to prevent simultaneous closure and short circuits). Currently, AC power supply isolation typically involves mechanical interlocking (interlocking plates) to isolate the external and internal AC power supply miniature circuit breakers, or using a transfer switch to achieve single-circuit isolation. Consequently, only one power supply method, internal or external, can be used. If an AC power supply anomaly occurs, the power supply system cannot promptly adjust the power supply mode, resulting in limited flexibility and adaptability. Technical issues

[0004] The technical problem to be solved by the present invention is to provide a multi-power supply system and method to improve power supply flexibility and expand the applicable scenarios of the power supply system. Technical Solutions

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A multi-power supply system includes an AC power supply unit, a DC power supply unit and a control unit; the AC power supply unit includes an AC external power supply side, an AC internal power supply side and a first relay;

[0007] The AC external power supply side is connected to the normally open input terminal of the first relay, and the AC internal power supply side is connected to the normally closed input terminal of the first relay; the output terminal of the first relay is connected to the first input terminal of the DC power supply unit, and the output terminal of the DC power supply unit is used to output a preset voltage;

[0008] The control unit is connected to the signal end of the first relay and the signal end of the DC power supply unit respectively.

[0009] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0010] A multi-power supply method, used in the multi-power supply system, comprising:

[0011] When voltage input to the AC power supply unit is detected, a first power supply signal from the AC external power supply side is obtained;

[0012] A preset AC power supply strategy is executed by the control unit according to the first power supply signal, and the AC external power supply side or the AC internal power supply side is selected to supply power to the DC power supply unit. Beneficial effects

[0013] The beneficial effect of the present invention is that: a first relay is set to be connected to the control unit, the AC external power supply side and the AC internal power supply side respectively, and the control unit controls the signal end of the first relay to drive the opening and closing states of the normally closed input end and the normally open input end of the first relay, so as to realize the control of the conduction state of the AC external power supply side and the AC internal power supply side, thereby selecting the AC external power supply side or the AC internal power supply side to output power to the DC power supply unit. On this basis, the present invention realizes the arbitrary switching and control of the power supply mode of the AC power supply unit by means of soft switching, avoids the isolation by means of physical isolation, and effectively improves the flexibility of switching the power supply mode. The AC power supply unit and the DC power supply unit of the present invention are jointly controlled based on a control unit, without the need for complex calculations and wiring, simplifying the power supply system architecture, reducing power supply costs, and realizing flexible switching and adjustment of the power supply mode, which can effectively avoid the problem that when one power supply has an accident, another power supply cannot be used to supply power in time, thereby improving the reliability and safety of the power supply of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG1 is a system architecture diagram of a multi-power supply system provided by an embodiment of the present invention;

[0015] FIG2 is a flowchart of a multi-power supply method according to an embodiment of the present invention;

[0016] Description of labels:

[0017] 1. AC power supply unit; 2. DC power supply unit; 3. Control unit; 11. AC external power supply side; 12. AC internal power supply side; 21. AC to DC power supply; 22. DC to DC power supply; K1, first relay; K2, second relay; K3, third relay; NO, normally open input; NC, normally closed input; OUT, output; QF1, first miniature circuit breaker; QF2, second miniature circuit breaker; T1, transformer; D1, first diode; D2, second diode; 3D, Drive control signal terminal; 3I, feedback receiving signal terminal; 3D1, first drive terminal; 3D2, second drive terminal; 3D3, third drive terminal; 3I1, first feedback terminal; 3I2, second feedback terminal; 3I3, third feedback terminal; KD1, drive signal terminal of the first relay; KD2, drive signal terminal of the second relay; KD3, drive signal terminal of the third relay; KI1, feedback signal terminal of the first relay; KI2, feedback signal terminal of the second relay; KI3, feedback signal terminal of the third relay. Modes for Carrying Out the Invention

[0018] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0019] Referring to FIG1 , an embodiment of the present invention provides a multi-power supply system, including an AC power supply unit, a DC power supply unit, and a control unit; the AC power supply unit includes an AC external power supply side, an AC internal power supply side, and a first relay;

[0020] The AC external power supply side is connected to the normally open input terminal of the first relay, and the AC internal power supply side is connected to the normally closed input terminal of the first relay; the output terminal of the first relay is connected to the first input terminal of the DC power supply unit, and the output terminal of the DC power supply unit is used to output a preset voltage;

[0021] The control unit is connected to the signal end of the first relay and the signal end of the DC power supply unit respectively.

[0022] The operating principle of the present invention is as follows: when the signal end of the first relay receives a control signal generated by the control unit, the signal end of the first relay generates a drive signal, thereby changing the open / close state of the normally closed input and normally open input of the first relay. The open / close state of the first relay determines the conduction state of the circuits on different power supply sides. For example, if the normally closed input of the first relay is currently closed and the normally open input of the first relay is currently open, the DC power supply unit is powered by the internal AC power supply side. Because the normally closed input of the internal AC power supply side connected to the first relay is currently closed, the circuit is conductive. If, at this time, the signal end of the first relay receives a control signal generated by the control unit, the drive signal of the signal end of the first relay changes, causing the normally closed input of the first relay to switch to an open state and the normally open input of the first relay to switch to a closed state. The DC power supply unit is powered by the external AC power supply side. Because the normally open input of the external AC power supply side connected to the first relay is currently closed, the circuit is conductive. Thus, the conduction state of the circuit is controlled by the signal end of the first relay.

[0023] As can be seen from the above description, the beneficial effects of the present invention are: setting a first relay to connect the control unit, the AC external power supply side and the AC internal power supply side respectively, then the control unit controls the signal end of the first relay, drives the opening and closing states of the normally closed input end and the normally open input end of the first relay, and thus can realize the control of the conduction conditions of the AC external power supply side and the AC internal power supply side, thereby selecting the AC external power supply side or the AC internal power supply side to output power to the DC power supply unit. On this basis, the present invention realizes the arbitrary switching and control of the power supply mode of the AC power supply unit by means of soft switching, avoids the isolation by means of physical isolation, and effectively improves the flexibility of switching the power supply mode. The AC power supply unit and the DC power supply unit of the present invention are jointly controlled based on a control unit, without the need for complex calculations and wiring, simplifying the power supply system architecture, reducing power supply costs, and realizing flexible switching and adjustment of the power supply mode, which can effectively avoid the problem that when one power supply has an accident, another power supply cannot be used to supply power in time, thereby improving the reliability and safety of the power supply of the power supply system.

[0024] Furthermore, the DC power supply unit includes an AC-DC power supply, a DC-DC power supply, a second relay, and a third relay; the input end of the AC-DC power supply serves as the first input end of the DC power supply unit;

[0025] The output end of the first relay is connected to the input end of the AC-DC power supply; the output end of the AC-DC power supply is connected to the normally closed input end of the second relay, and the output end of the second relay is used to output a preset voltage;

[0026] The input end of the DC-DC power supply is used to input a DC voltage, the output end of the DC-DC power supply is connected to the normally closed input end of the third relay, and the output end of the second relay is used to output a preset voltage;

[0027] The control unit is connected to the signal ends of the second relay and the third relay respectively.

[0028] As can be seen from the above description, a second relay and a third relay are simultaneously provided in the DC power supply unit, and the signals generated by the control unit are used to control the second relay and the third relay to generate corresponding drive signals, thereby changing the open and close states of their normally closed input terminals, so that the AC-to-DC power supply or the DC-to-DC power supply can be connected to the corresponding load and output a preset voltage. In this way, the present invention can adjust the circuit conduction of the DC power supply unit by adjusting the signal generated by the control unit, thereby selecting a suitable power supply for power supply. In this case, the AC power supply unit and the DC power supply unit can be comprehensively controlled based on the control unit to avoid signal disorder in the power supply system and ensure power supply safety.

[0029] Furthermore, the control unit includes a drive control signal terminal and a feedback receiving signal terminal; the signal terminals of the first relay, the second relay and the third relay all include a drive signal terminal and a feedback signal terminal;

[0030] The driving control signal end of the control unit is connected to the driving signal ends of the first relay, the second relay and the third relay respectively; the feedback receiving signal end of the control unit is connected to the feedback signal ends of the first relay, the second relay and the third relay respectively.

[0031] From the above description, it can be seen that the control unit switches the open and closed states of the first relay, the second relay and the third relay input terminals respectively through the driving control signal terminal, and then receives the feedback signal of the relay through the feedback receiving signal terminal, so as to judge whether the current relay is fully driven and determine the current power supply mode based on the feedback signal to ensure the accuracy and reliability of the power supply.

[0032] Furthermore, the AC power supply unit further includes a first miniature circuit breaker, a second miniature circuit breaker and a transformer;

[0033] The AC external power supply side is connected to the input end of the first miniature circuit breaker, and the output end of the first miniature circuit breaker is connected to the normally open input end of the first relay;

[0034] The AC internal power supply side is connected to the input end of the second miniature circuit breaker, the output end of the second miniature circuit breaker is connected to the input end of the transformer, and the output end of the transformer is connected to the normally closed input end of the first relay.

[0035] From the above description, it can be seen that the AC external power supply side and the AC internal power supply side are both connected to the first relay, and one relay controls both the AC internal power supply and the AC external power supply. In this way, the isolation of the AC internal / external power supply is achieved, that is, at this time, the first miniature circuit breaker and the second miniature circuit breaker of the AC internal / external power supply can both be closed. Because the opening and closing states of the normally closed input terminal and the normally open input terminal in the first relay are always opposite, it can be ensured that only one power supply circuit can be conducted between the two, and there is no need to isolate the two through mechanical interlocking, which effectively improves the power supply flexibility.

[0036] Referring to FIG. 2 , another embodiment of the present invention provides a multi-power supply method for use in the multi-power supply system described above, including:

[0037] When voltage input to the AC power supply unit is detected, a first power supply signal from the AC external power supply side is obtained;

[0038] A preset AC power supply strategy is executed by the control unit according to the first power supply signal, and the AC external power supply side or the AC internal power supply side is selected to supply power to the DC power supply unit.

[0039] From the above description, it can be seen that the beneficial effect of the present invention is that: according to the power supply system architecture, the power supply control can be divided into the control of the AC power supply unit and the control of the DC power supply unit. Among them, when it is detected that there is a voltage input to the AC power supply unit, it means that there is an electrical input to the AC external power supply side or the AC internal power supply side. At this time, the corresponding power supply signal is obtained, and the AC power supply strategy is executed by the control unit according to the power supply signal, so as to control the conduction of the AC external power supply side and the AC internal power supply side. The present invention adjusts the control unit to execute different AC power supply strategies through the power supply signal, realizes the soft switching of the power supply circuit, thereby achieving the purpose of arbitrary switching and control of the power supply mode of the AC power supply unit, avoiding the limitation of only being able to select one power supply mode due to isolation by physical isolation, effectively improving the flexibility of power supply mode switching, and can effectively avoid the problem that when one power supply has an accident, another power supply cannot be used to supply power in time, thereby improving the reliability and safety of the power supply of the power supply system.

[0040] Furthermore, it also includes:

[0041] When it is detected that the voltage state of the DC power supply unit reaches a preset voltage value, a second power supply signal of the AC-DC power supply and a third power supply signal of the DC-DC power supply are respectively obtained;

[0042] A preset DC power supply strategy is executed by the control unit according to the second power supply signal and the third power supply signal, and the AC-DC power supply and / or the DC-DC power supply are selected to output a preset voltage value.

[0043] As can be seen from the above description, when the voltage of the DC power supply unit reaches a preset voltage value, it indicates that the AC-DC power supply or the DC-DC power supply is now capable of supplying power. Therefore, the corresponding power supply signals are obtained. The control unit executes the DC power supply strategy based on the power supply signals to control the AC-DC power supply and the DC-DC power supply to output the preset voltage value. In this way, the AC-DC power supply and the DC-DC power supply can output voltage simultaneously, increasing the flexibility of the power supply method.

[0044] Furthermore, executing a preset AC power supply strategy by the control unit according to the first power supply signal and selecting the AC external power supply side or the AC internal power supply side to power the DC power supply unit includes:

[0045] If the first power supply signal indicates that power supply is allowed, the control unit drives the signal end of the first relay to generate a first driving signal;

[0046] The open and closed states of the normally open input terminal of the first relay and the normally closed input terminal of the first relay are switched according to the first driving signal.

[0047] As can be seen from the above description, the control unit drives the relay to generate a corresponding drive signal based on the first power supply signal, thereby switching the open and closed states of the normally open input terminal and the normally closed input terminal of the first relay, thereby controlling the conductivity between the AC external power supply side and the AC internal power supply side, and realizing the selection of AC external power supply or AC internal power supply. When the first power supply signal allows power supply, the circuit on the AC external power supply side is connected and the circuit on the AC internal power supply side is disconnected, thereby improving the power supply flexibility of the AC power supply unit.

[0048] Furthermore, executing a preset DC power supply strategy by a control unit according to the second power supply signal and the third power supply signal to select the AC-DC power supply and / or the DC-DC power supply to output a preset voltage value includes:

[0049] If the second power supply signal indicates that power supply is not allowed and the third power supply signal indicates that power supply is allowed, the control unit drives the signal end of the second relay to generate a second drive signal;

[0050] The open / close state of the normally closed input terminal of the second relay is switched according to the second driving signal.

[0051] From the above description, it can be seen that when the second power supply signal is to allow power supply and the third power supply signal is not to allow power supply, it is only necessary to control the second relay of the AC-DC power supply to turn on its circuit and achieve the effect of power supply by the AC-DC power supply, thereby realizing independent control between the two power supplies, avoiding the problem of mutual dependence between the two, and thus improving the power supply flexibility.

[0052] Furthermore, executing a preset DC power supply strategy by a control unit according to the second power supply signal and the third power supply signal to select the AC-DC power supply and / or the DC-DC power supply to output a preset voltage value includes:

[0053] If the second power supply signal indicates that power supply is allowed and the third power supply signal indicates that power supply is not allowed, the control unit drives the signal end of the third relay to generate a third drive signal;

[0054] The open / close state of the normally closed input terminal of the third relay is switched according to the third driving signal.

[0055] As can be seen from the above description, when the second power supply signal indicates that power is not permitted and the third power supply signal indicates that power is permitted, the DC-DC power supply can be switched on simply by controlling the third relay of the DC-DC power supply. This eliminates the need for the AC-DC power supply to control this power supply, as the two power supply control processes are independent of each other, improving power supply flexibility.

[0056] Furthermore, it also includes:

[0057] detecting the control unit according to the open / close state to obtain a feedback signal;

[0058] A power supply mode of the multi-power supply system is determined according to the feedback signal.

[0059] From the above description, it can be seen that the open and closed state of the relay port is related to the feedback signal generated by the control unit, which is used to determine whether the current relay has successfully conducted the circuit. At the same time, the current power supply mode is determined based on the feedback signal to ensure the accuracy and reliability of the power supply.

[0060] The present invention provides a multi-power supply system and method, which can be applied to a PCS converter power supply system, improves power supply flexibility, enriches the power supply modes of the power supply system, and expands the applicable scenarios of the power supply system. The following is an explanation with reference to specific embodiments:

[0061] Please refer to FIG1 , the first embodiment of the present invention is:

[0062] A multi-power supply system includes an AC power supply unit 1, a DC power supply unit 2 and a control unit 3; the AC power supply unit 1 includes an AC external power supply side 11, an AC internal power supply side 12 and a first relay K1; the AC external power supply side 11 is connected to the normally open input terminal NO of the first relay K1, and the AC internal power supply side 12 is connected to the normally closed input terminal NC of the first relay K1; the output terminal OUT of the first relay K1 is connected to the first input terminal of the DC power supply unit 2, and the output terminal of the DC power supply unit 2 is used to output a preset voltage; the control unit 3 is respectively connected to the signal terminal of the first relay K1 and the signal terminal of the DC power supply unit 2.

[0063] In this embodiment, the preset voltage is 24V.

[0064] In an optional embodiment, the AC power supply unit 1 also includes a first miniature circuit breaker QF1, a second miniature circuit breaker QF2 and a transformer T1; the AC external power supply side 11 is connected to the input end of the first miniature circuit breaker QF1, and the output end of the first miniature circuit breaker QF1 is connected to the normally open input end NO of the first relay K1; the AC internal power supply side 12 is connected to the input end of the second miniature circuit breaker QF2, the output end of the second miniature circuit breaker QF2 is connected to the input end of the transformer T1, and the output end of the transformer T1 is connected to the normally closed input end NC of the first relay K1.

[0065] It should be noted that the transformer T1 is a line voltage transformer that converts the line voltage of 400 V into the phase voltage of 230 V. As shown in FIG1 , the AC-N line in the circuit represents the neutral line, and the AC-L line represents the live line.

[0066] Currently, in related technologies, DC power supplies include AC / DC power supplies and DC / DC power supplies, both of which can output 24V voltage. Since the two power supplies are selected by pre-set priority levels, the two power supplies cannot be used at the same time. The power supply method is single and highly dependent, and the power supply system cannot provide flexible power supply.

[0067] In an optional embodiment, the DC power supply unit 2 includes an AC-to-DC power supply 21, a DC-to-DC power supply 22, a second relay K2 and a third relay K3; the input end of the AC-to-DC power supply 21 serves as the first input end of the DC power supply unit 2; the output end OUT of the first relay K1 is connected to the input end of the AC-to-DC power supply 21; the output end of the AC-to-DC power supply 21 is connected to the normally closed input end NC of the second relay K2, and the output end OUT of the second relay K2 is used to output a preset voltage; the input end of the DC-to-DC power supply 22 is used to input a DC voltage, the output end of the DC-to-DC power supply 22 is connected to the normally closed input end NC of the third relay K3, and the output end OUT of the second relay K2 is used to output a preset voltage; the control unit 3 is respectively connected to the signal ends of the second relay K2 and the third relay K3.

[0068] In this embodiment, as shown in Figure 1 , the DC power supply unit 2 further includes a first diode D1 and a second diode D2. The live wire L output end of the AC-DC power supply 21 is connected to the anode of the first diode D1, and the cathode of the first diode D1 is used to output a preset voltage. The live wire L output end of the DC-DC power supply 22 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is used to output a preset voltage. This ensures power supply security.

[0069] It should be noted that, as shown in FIG1 , the AC-to-DC power supply 21 is an AC / DC power supply, and the DC-to-DC power supply 22 is a DC / DC power supply. DC+ represents the positive pole of the power supply, and DC- represents the negative pole of the power supply. Among them, the DC / DC power supply can be called a battery power supply. If the power supply is selected according to the priority level, the battery power supply generally has a higher priority than the AC / DC power supply. In this case, even if the battery power supply is in a low voltage state, the power supply system will still select the battery power supply for power supply, which will result in increased battery loss and affect the power supply safety of the power supply system. The system architecture of the present invention can effectively avoid power supply when the battery power supply is in a low voltage state, thereby ensuring the power supply safety of the system.

[0070] In an optional embodiment, the control unit 3 includes a drive control signal terminal 3D and a feedback receiving signal terminal 3I; the signal terminals of the first relay K1, the second relay K2 and the third relay K3 all include a drive signal terminal and a feedback signal terminal; the drive control signal terminal 3D of the control unit 3 is respectively connected to the drive signal terminals of the first relay K1, the second relay K2 and the third relay K3; the feedback receiving signal terminal 3I of the control unit 3 is respectively connected to the feedback signal terminals of the first relay K1, the second relay K2 and the third relay K3.

[0071] In this embodiment, the drive control signal terminal 3D includes a first drive terminal 3D1, a second drive terminal 3D2 and a third drive terminal 3D3; the feedback receiving signal terminal 3I includes a first feedback terminal 3I1, a second feedback terminal 3I2 and a third feedback terminal 3I3; the first drive terminal 3D1 is connected to the drive signal terminal KD1 of the first relay K1, and the first feedback terminal 3I1 is connected to the feedback signal terminal KI1 of the first relay K1; the second drive terminal 3D2 is connected to the drive signal terminal KD2 of the second relay K2, and the second feedback terminal 3I2 is connected to the feedback signal terminal KI2 of the second relay K2; the third drive terminal 3D3 is connected to the drive signal terminal KD3 of the third relay K3, and the third feedback terminal 3I3 is connected to the feedback signal terminal KI3 of the third relay K3. That is, the control unit 3 is respectively provided with a first drive end 3D1, a second drive end 3D2 and a third drive end 3D3, which are then respectively connected to the drive signal ends of the corresponding relays, so that one control unit 3 can jointly control the AC power supply unit 1 and the DC power supply unit 2. The overall control of the power supply system can be achieved without complex calculations and wiring, which effectively improves the convenience and flexibility of power supply control.

[0072] It should be noted that each driver terminal in the control unit 3 can be a switch signal. As shown in Figure 1, the first driver terminal 3D1 includes ports D.1 and D.2, with the connection between ports D.1 and D.2 being normally closed. The second driver terminal 3D2 includes ports D.3 and D.4, with the connection between ports D.3 and D.4 being normally open. The third driver terminal 3D3 includes ports D.5 and D.6, with the connection between ports D.5 and D.6 being normally open. Therefore, in the default state, the first driver terminal 3D1 is closed, the second driver terminal 3D2 is open, and the third driver terminal 3D3 is open. Each feedback terminal in the control unit 3 includes two state feedback ports. As shown in Figure 1, the first feedback terminal 3I1 includes ports I.1 and I.2, the second feedback terminal 3I2 includes ports I.3 and I.4, and the third feedback terminal 3I3 includes ports I.5 and I.6.

[0073] It should be noted that, as shown in Figure 1, A1 and A2 represent the internal coils of the relays, which are used to close the switch. For example, when the drive signal terminal KD1 of the first relay K1 receives a voltage signal, the voltage difference between the drive signal terminal KD1 at terminal A1 and the neutral line at terminal A2 turns on the coil, generating magnetic force and closing the switch. The same applies to the second relay K2 and the third relay K3.

[0074] In this embodiment, the first driver terminal 3D1 is connected to the drive signal terminal KD1 of the first relay K1 by: the normally open input terminal NO of the first relay K1 is connected to the first driver terminal 3D1 (D.1 port), and then connected to the drive signal terminal KD1 of the first relay K1 through the first driver terminal 3D1 (D.2 port). The second driver terminal 3D2 is connected to the drive signal terminal KD2 of the second relay K2 by: the normally closed input terminal NC of the second relay K2 is connected to the second driver terminal 3D2 (D.3 port), and then connected to the drive signal terminal KD2 of the second relay K2 through the second driver terminal 3D2 (D.4 port). The third driver terminal 3D3 is connected to the drive signal terminal KD3 of the third relay K3 by: the normally closed input terminal NC of the third relay K3 is connected to the third driver terminal 3D3 (D.5 port), and then connected to the drive signal terminal KD3 of the third relay K3 through the third driver terminal 3D3 (D.6 port).

[0075] In this embodiment, the working principle of the first relay K1 controlling the AC internal power supply side 12 and the AC external power supply side 11 to provide power is specifically as follows:

[0076] (1) When the normally open input terminal NO of the first relay K1 receives a voltage signal, and the normally closed input terminal NC of the first relay K1 does not receive a voltage signal, since the normally open input terminal NO of the first relay K1 is in an open state and cannot transmit a voltage signal, and the first drive terminal 3D1 is in a closed state, the normally open input terminal NO of the first relay K1 is connected to the first drive terminal 3D1 (D.1 port), and then connected to the drive signal terminal KD1 (A1 port) of the first relay K1 through the first drive terminal 3D1 (D.2 port), and the drive signal terminal KD1 (A2 port) of the first relay K1 is connected to the power supply N. This causes the internal coil of the first relay K1 to generate magnetic force, and the first relay K1 is closed, that is, the normally open input terminal NO of the first relay K1 is switched to a closed state, achieving the effect of turning on the AC external power supply side 11 for power supply. At this time, the feedback signal terminal KI1 of the first relay K1 is in a low level state 0, and the signal detected by the first feedback terminal 3I1 of the control unit 3 is 0, indicating that the AC external power supply side 11 is currently supplying power.

[0077] That is, only when there is voltage input on the AC external power supply side 11, the first drive terminal 3D1 of the control unit 3 remains in a closed state, and the drive signal terminal KD1 of the first relay K1 is attracted to close the switch, so that the normally open input terminal NO of the first relay K1 is switched to a closed state, and power is supplied by the AC external power supply side 11.

[0078] (2) When the normally closed input terminal NC of the first relay K1 receives a voltage signal, and the normally open input terminal NO of the first relay K1 does not receive a voltage signal, although the first drive terminal 3D1 is in a closed state at this time, since no voltage signal is received between the normally closed input terminal NC of the first relay K1 and the first drive terminal 3D1, the voltage signal cannot be transmitted to the drive signal terminal KD1 of the first relay K1, the internal coil of the first relay K1 does not generate magnetic force, and the drive signal terminal KD1 of the first relay K1 does not attract the switch, that is, the normally closed input terminal NC of the first relay K1 remains in a closed state, achieving the effect of turning on the AC internal power supply side 12 for power supply. At this time, the feedback signal terminal KI1 of the first relay K1 is in the high level state 1, and the signal detected by the first feedback terminal 3I1 of the control unit 3 is 1, indicating that the AC internal power supply side 12 is currently supplying power.

[0079] That is, only when there is voltage input on the AC internal power supply side 12, the first drive terminal 3D1 of the control unit 3 remains in a closed state, but the drive signal terminal KD1 of the first relay K1 cannot attract the switch, so that the normally closed input terminal NC of the first relay K1 remains in a closed state, and power is supplied by the AC internal power supply side 12.

[0080] (3) When the first driving terminal 3D1 is in the disconnected state, regardless of whether the normally open input terminal NO of the first relay K1 receives a voltage signal, the voltage signal cannot be transmitted to the driving signal terminal KD1 of the first relay K1. The internal coil of the first relay K1 does not generate magnetic force, and the driving signal terminal KD1 of the first relay K1 does not attract the switch, and the effect of turning on the AC external power supply side 11 for power supply cannot be achieved.

[0081] That is, when the first driving terminal 3D1 of the control unit 3 is switched to the disconnected state, regardless of whether there is voltage input on the AC external power supply side 11, the switch cannot be closed through the driving signal terminal KD1 of the first relay K1, so that the normally open input terminal NO of the first relay K1 remains in the disconnected state and cannot be powered by the AC external power supply side 11.

[0082] The working principle of the second relay K2 controlling the AC-DC power supply 21 to output a preset voltage is as follows:

[0083] (1) When the normally closed input terminal NC of the second relay K2 receives a voltage signal, the second drive terminal 3D2 is in an open state, and the voltage signal cannot be transmitted to the drive signal terminal KD2 of the second relay K2. The internal coil of the second relay K2 does not generate magnetic force, and the drive signal terminal KD2 of the second relay K2 does not attract the switch. That is, the normally closed input terminal NC of the second relay K2 remains in a closed state, achieving the effect of turning on the AC-DC power supply 21 to output the preset voltage. At this time, the feedback signal terminal KI2 of the second relay K2 is in the high level state 1, and the signal detected by the second feedback terminal 3I2 of the control unit 3 is 1, indicating that the AC-DC power supply 21 is currently outputting the preset voltage.

[0084] That is, when the AC-DC power supply 21 outputs a voltage, the second drive terminal 3D2 of the control unit 3 remains in a disconnected state, and the drive signal terminal KD2 of the second relay K2 cannot attract the switch, so that the normally closed input terminal NC of the second relay K2 remains in a closed state, and the AC-DC power supply 21 outputs the preset voltage.

[0085] (2) When the second driving terminal 3D2 is in a closed state, regardless of whether the normally closed input terminal NC of the second relay K2 receives a voltage signal, the voltage signal is transmitted to the driving signal terminal KD2 of the second relay K2 through the second driving terminal 3D2, and the internal coil of the second relay K2 generates magnetic force, and the driving signal terminal KD2 of the second relay K2 attracts the switch, that is, the normally closed input terminal NC of the second relay K2 is switched to an open state, and the effect of turning on the AC-DC power supply 21 to output the preset voltage cannot be achieved.

[0086] That is, when the second driving terminal 3D2 of the control unit 3 is switched to a closed state, regardless of whether the AC-to-DC power supply 21 outputs a voltage, the switch will be closed through the driving signal terminal KD2 of the second relay K2, so that the normally closed input terminal NC of the second relay K2 is switched to an open state, and the preset voltage cannot be output by the AC-to-DC power supply 21.

[0087] The working principle of the third relay K3 controlling the DC-DC power supply 22 is similar to that of the second relay K2 and will not be described in detail here.

[0088] Referring to Figures 1 and 2, the second embodiment of the present invention is as follows:

[0089] A multi-power supply method, used in the multi-power supply system described in Embodiment 1, comprising:

[0090] S101: When voltage is detected in an AC power supply unit, a first power supply signal from an AC external power supply side is obtained.

[0091] In this embodiment, detecting that there is voltage input to the AC power supply unit specifically includes: detecting that there is voltage input to the AC internal power supply side or the AC external power supply side.

[0092] S102: Execute a preset AC power supply strategy through the control unit according to the first power supply signal, and select the AC external power supply side or the AC internal power supply side to power the DC power supply unit.

[0093] It should be noted that the first power supply signal, the second power supply signal and the third power supply signal are power supply instructions input by the user.

[0094] In an optional implementation, step S102 includes:

[0095] S1021: If the first power supply signal indicates that power supply is allowed, the control unit drives the signal end of the first relay to generate a first drive signal.

[0096] S1022: Switch the open and close states of the normally open input terminal of the first relay and the normally closed input terminal of the first relay according to the first drive signal, wherein the open and close states include a closed state and an open state.

[0097] S1023. Detect the control unit according to the open / close state and obtain a feedback signal.

[0098] S1024: Determine a power supply mode of the multi-power supply system according to the feedback signal.

[0099] In some embodiments, as shown in FIG1 , the AC power supply strategy executed by the control unit includes:

[0100] When the first power supply signal indicates that power supply is allowed, the method includes:

[0101] (1) It is detected that only the AC external power supply side 11 has voltage input. The first drive terminal 3D1 of the control unit 3 remains in a normally closed state, driving the drive signal terminal KD1 of the first relay K1 to attract the switch, the normally open input terminal NO of the first relay K1 switches to a closed state, and the normally closed input terminal NC of the first relay K1 switches to an open state. The first feedback terminal 3I1 of the control unit 3 detects that the feedback signal is in the low level state 0, and determines that the current AC power supply unit 1 selects the AC external power supply side 11 to power the DC power supply unit 2.

[0102] (2) It is detected that only the AC internal power supply side 12 has voltage input. The first drive terminal 3D1 of the control unit 3 remains in a normally closed state. There is no voltage signal to drive the drive signal terminal KD1 of the first relay K1, and the switch cannot be attracted. The normally open input terminal NO of the first relay K1 remains in an open state, and the normally closed input terminal NC of the first relay K1 remains in a closed state. The first feedback terminal 3I1 of the control unit 3 detects that the feedback signal is in the high level state 1, and determines that the current AC power supply unit 1 selects the AC internal power supply side 12 to power the DC power supply unit 2.

[0103] (3) It is detected that voltage is input to both the AC external power supply side 11 and the AC internal power supply side 12 at the same time, and the voltage input to the AC internal power supply side 12 is earlier than the voltage input to the AC external power supply side 11. The first drive terminal 3D1 of the control unit 3 remains in a normally closed state.

[0104] (3-1) Because voltage is already input to AC internal power supply side 12, there is no voltage signal to drive drive signal terminal KD1 of first relay K1, and the switch cannot be closed. Normally open input terminal NO of first relay K1 remains open, and normally closed input terminal NC of first relay K1 remains closed. Control unit 3's first feedback terminal 3I1 detects a high-level feedback signal at state 1, and determines that AC power supply unit 1 currently selects AC internal power supply side 12 to power DC power supply unit 2.

[0105] (3-2) After a period of time, voltage is input to the AC external power supply side 11, driving the drive signal terminal KD1 of the first relay K1 to close. The normally open input terminal NO of the first relay K1 switches to a closed state, and the normally closed input terminal NC of the first relay K1 switches to an open state. The first feedback terminal 3I1 of the control unit 3 detects that the feedback signal is at a low level 0, and determines that the AC power supply unit 1 currently selects the AC external power supply side 11 to supply power to the DC power supply unit 2.

[0106] When the first power supply signal is not allowed to power on, the first driving terminal 3D1 of the control unit 3 is switched to the disconnected state, and the control unit 3 cannot drive the driving signal terminal KD1 of the first relay K1, thereby failing to close the switch. The normally open input terminal NO of the first relay K1 remains in the disconnected state, and the normally closed input terminal NC of the first relay K1 remains in the closed state, and the DC power supply unit 2 cannot be powered by the AC external power supply side 11.

[0107] The third embodiment of the present invention is:

[0108] A multi-power supply method, which differs from the second embodiment in that it limits the power supply method of the DC power supply unit, includes:

[0109] S201: When it is detected that the voltage state of the DC power supply unit reaches a preset voltage value, a second power supply signal of the AC-to-DC power supply and a third power supply signal of the DC-to-DC power supply are respectively obtained.

[0110] In this embodiment, detecting that the voltage state of the DC power supply unit reaches the preset voltage value specifically includes: detecting that the voltage state of the AC-DC power supply or the DC-DC power supply reaches the load voltage value.

[0111] S202: Execute a preset DC power supply strategy through the control unit according to the second power supply signal and the third power supply signal, and select an AC-to-DC power supply and / or a DC-to-DC power supply to output a preset voltage value.

[0112] In an optional implementation, step S202 includes:

[0113] S2021a: If the second power supply signal indicates that power supply is not allowed and the third power supply signal indicates that power supply is allowed, the control unit drives the signal end of the second relay to generate a second drive signal.

[0114] S2022a. Switch the open / close state of the normally closed input terminal of the second relay according to the second drive signal.

[0115] S2023a. Detect the control unit according to the open / close state and obtain a feedback signal.

[0116] S2024a. Determine a power supply mode of the multi-power supply system according to the feedback signal.

[0117] In another optional embodiment, step S4 includes:

[0118] S2021b: If the second power supply signal indicates that power supply is allowed and the third power supply signal indicates that power supply is not allowed, the control unit drives the signal end of the third relay to generate a third drive signal.

[0119] S2022b: Switch the open / close state of the normally closed input terminal of the third relay according to the third driving signal.

[0120] S2023b, detecting the control unit according to the open / close state, and obtaining a feedback signal.

[0121] S2024b. Determine a power supply mode of the multi-power supply system according to the feedback signal.

[0122] In some embodiments, the load voltage is 24V, and the DC power supply strategy implemented by the control unit includes:

[0123] When the second power supply signal and the third power supply signal are both power supply permission, the method includes:

[0124] (1) It is detected that only the voltage of the AC-DC power supply 21 has reached 24V. The second drive terminal 3D2 of the control unit 3 remains in the normally open state, and the drive signal terminal KD2 of the second relay K2 is not driven, so the switch cannot be attracted. The normally closed input terminal NC of the second relay K2 remains in the closed state. The second feedback terminal 3I2 of the control unit 3 detects that the feedback signal is in the high level state 1, and determines that the AC-DC power supply 21 is currently selected to output a voltage of 24V.

[0125] (2) It is detected that only the voltage of the DC-DC power supply 22 has reached 24V. The third drive terminal 3D3 of the control unit 3 remains in the normally open state, and the drive signal terminal KD3 of the third relay K3 is not driven, so the switch cannot be attracted. The normally closed input terminal NC of the third relay K3 remains in the closed state. The third feedback terminal 3I3 of the control unit 3 detects that the feedback signal is in the high level state 1, and determines that the DC-DC power supply 22 is currently selected to output a voltage of 24V.

[0126] (3) It is detected that the voltage states of the AC-DC power supply 21 and the DC-DC power supply 22 reach 24V at the same time. The second drive terminal 3D2 and the third drive terminal 3D3 of the control unit 3 both remain in the normally open state. The same applies to strategies (1) and (2) of this embodiment, and will not be repeated here. At this time, the AC-DC power supply 21 and the DC-DC power supply 22 simultaneously output 24V voltage, achieving common load carrying.

[0127] When it is detected that the voltage states of the AC-DC power supply 21 and the DC-DC power supply 22 reach 24V at the same time, and the second power supply signal or the third power supply signal indicates that power supply is allowed, the method includes:

[0128] (4) Before the load is turned on, the third power supply signal allows power supply; after the load is turned on, the second power supply signal allows power supply (i.e., before the load is turned on, the DC-DC power supply 22 outputs a 24V voltage, and after the load is turned on, the AC-DC power supply 21 outputs a 24V voltage). Before the load is turned on, the third drive terminal 3D3 of the control unit 3 remains in a normally open state, which is the same as strategy (2) of this embodiment and will not be described in detail here. After the load is successfully turned on, the third drive terminal 3D3 of the control unit 3 switches to a closed state, driving the drive signal terminal KD3 of the third relay K3 to attract the switch, and the normally closed input terminal NC of the third relay K3 switches to an open state. The third feedback terminal 3I3 of the control unit 3 detects that the feedback signal is in a low level state 0. At the same time, the second drive terminal 3D2 of the control unit 3 remains in a normally open state, which is the same as strategy (1) of this embodiment and will not be described in detail here. It is determined that the AC-DC power supply 21 is currently selected to output a 24V voltage.

[0129] (5) When the DC-DC power supply 22 is in low-voltage standby mode, the third power supply signal disallows power supply, while the second power supply signal allows power supply (i.e., the DC-DC power supply 22 is turned off and the AC-DC power supply 21 supplies power) to prevent over-discharge of the battery. The third drive terminal 3D3 of the control unit 3 is switched to a closed state, similar to the successful start-up of the load in strategy (4) of this embodiment, and will not be further described here. It is determined that the AC-DC power supply 21 currently outputs a voltage of 24V.

[0130] (6) When the AC voltage input of the AC power supply unit 1 is unstable, the second power supply signal does not allow power supply, and the third power supply signal allows power supply (i.e., the AC to DC power supply 21 is turned off and the DC to DC power supply 22 is used for power supply). The second drive terminal 3D3 of the control unit 3 switches to a closed state, driving the drive signal terminal KD2 of the second relay K3 to close the switch, and the normally closed input terminal NC of the second relay K2 switches to an open state. The second feedback terminal 3I2 of the control unit 3 detects that the feedback signal is in a low level state 0. At the same time, the third drive terminal 3D3 of the control unit 3 remains in a normally open state, which is similar to strategy (2) of this embodiment and will not be described in detail here. It is determined that the current DC to DC power supply 22 outputs a voltage of 24V.

[0131] (7) Either the second power supply signal or the third power supply signal is selected to allow power supply (any power supply is selected to output 24V voltage). The DC power supply strategy is the same as strategy (5) or strategy (6) of this embodiment and will not be described here.

[0132] In summary, the present invention provides a multi-power supply system and method. By setting a first relay to be connected to a control unit, an AC external power supply side, and an AC internal power supply side, respectively, the control unit controls the drive signal end of the first relay, thereby switching the open and close states of the normally closed input end and the normally open input end of the first relay, thereby controlling the conduction of the AC external power supply side and the AC internal power supply side, thereby selecting the AC external power supply side or the AC internal power supply side to output power to the DC power supply unit. In addition, by switching the drive signal of the control unit, the power supply mode can be quickly adjusted, that is, the power supply mode of the AC power supply unit can be arbitrarily switched and controlled by a soft switch, avoiding isolation by physical isolation, and effectively improving the flexibility of power supply mode switching. At the same time, the signal generated by the control unit controls the second relay and the third relay to generate corresponding drive signals, thereby changing the open and close states of their normally closed input ends, so that the AC to DC power supply or the DC to DC power supply can be connected to the corresponding load and output a preset voltage. The AC to DC power supply and the DC to DC power supply are controlled by independent relays, avoiding power supply dependence between the two and achieving arbitrary selection of power supply modes. The AC power supply unit and the DC power supply unit of the present invention are jointly controlled based on a control unit, without the need for complex calculations and wiring, simplifying the power supply system architecture, reducing power supply costs, and realizing flexible switching and adjustment of power supply modes. It can effectively avoid the problem that when one power supply has an accident and another power supply cannot be used to supply power in time, thereby improving the reliability and safety of the power supply system.

[0133] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A multi-power supply system, characterized in that: It includes an AC power supply unit, a DC power supply unit and a control unit; the AC power supply unit includes an AC external power supply side, an AC internal power supply side and a first relay; The AC external power supply side is connected to the normally open input end of the first relay, and the AC internal power supply side is connected to the normally closed input end of the first relay; the output end of the first relay is connected to the first input end of the DC power supply unit, and the output end of the DC power supply unit is used to output a preset voltage; The control unit is respectively connected to a signal end of the first relay and a signal end of the DC power supply unit.

2. A multi-power supply system according to claim 1, characterized in that: The DC power supply unit includes an AC-DC power supply, a DC-DC power supply, a second relay and a third relay; the input end of the AC-DC power supply serves as the first input end of the DC power supply unit; The output end of the first relay is connected to the input end of the AC-DC power supply; the output end of the AC-DC power supply is connected to the normally closed input end of the second relay, and the output end of the second relay is used to output a preset voltage; The input end of the DC-to-DC power supply is used to input a DC voltage, the output end of the DC-to-DC power supply is connected to the normally closed input end of the third relay, and the output end of the second relay is used to output a preset voltage; The control unit is connected to the signal ends of the second relay and the third relay respectively.

3. A multi-power supply system according to claim 2, characterized in that: The control unit includes a drive control signal terminal and a feedback receiving signal terminal; the signal terminals of the first relay, the second relay and the third relay all include a drive signal terminal and a feedback signal terminal; The driving control signal end of the control unit is respectively connected to the driving signal ends of the first relay, the second relay and the third relay; the feedback receiving signal end of the control unit is respectively connected to the feedback signal ends of the first relay, the second relay and the third relay.

4. The multi-power supply system according to claim 1, characterized in that: The AC power supply unit further includes a first miniature circuit breaker, a second miniature circuit breaker and a transformer; The AC external power supply side is connected to the input end of the first miniature circuit breaker, and the output end of the first miniature circuit breaker is connected to the normally open input end of the first relay; The AC internal power supply side is connected to the input end of the second miniature circuit breaker, the output end of the second miniature circuit breaker is connected to the input end of the transformer, and the output end of the transformer is connected to the normally closed input end of the first relay.

5. A multi-power supply method, characterized in that: A multi-power supply system as claimed in any one of claims 1 to 4, comprising: When voltage input is detected in the AC power supply unit, a first power supply signal from the AC external power supply side is obtained; A preset AC power supply strategy is executed by the control unit according to the first power supply signal, and the AC external power supply side or the AC internal power supply side is selected to supply power to the DC power supply unit.

6. A multi-power supply method according to claim 5, characterized in that: Also includes: When it is detected that the voltage state of the DC power supply unit reaches a preset voltage value, a second power supply signal of the AC-to-DC power supply and a third power supply signal of the DC-to-DC power supply are respectively obtained; A preset DC power supply strategy is executed by the control unit according to the second power supply signal and the third power supply signal, and the AC-to-DC power supply and / or the DC-to-DC power supply are selected to output a preset voltage value.

7. The multi-power supply method according to claim 5, characterized in that: The executing a preset AC power supply strategy through the control unit according to the first power supply signal to select the AC external power supply side or the AC internal power supply side to supply power to the DC power supply unit includes: If the first power supply signal is to allow power supply, the control unit drives the signal end of the first relay to generate a first drive signal; The opening and closing states of the normally open input terminal of the first relay and the normally closed input terminal of the first relay are switched according to the first driving signal.

8. A multi-power supply method according to claim 6, characterized in that: The step of executing a preset DC power supply strategy through a control unit according to the second power supply signal and the third power supply signal to select the AC-DC power supply and / or the DC-DC power supply to output a preset voltage value includes: If the second power supply signal indicates that power supply is not allowed and the third power supply signal indicates that power supply is allowed, the control unit drives the signal end of the second relay to generate a second drive signal; The open / close state of the normally closed input terminal of the second relay is switched according to the second driving signal.

9. The multi-power supply method according to claim 6, characterized in that: The step of executing a preset DC power supply strategy through a control unit according to the second power supply signal and the third power supply signal to select the AC-DC power supply and / or the DC-DC power supply to output a preset voltage value includes: If the second power supply signal indicates that power supply is allowed and the third power supply signal indicates that power supply is not allowed, the control unit drives the signal end of the third relay to generate a third drive signal; The open / close state of the normally closed input terminal of the third relay is switched according to the third driving signal.

10. A multi-power supply method according to any one of claims 7 to 9, characterized in that: Also includes: Detecting the control unit according to the open and closed state to obtain a feedback signal; The power supply mode of the multi-power supply system is determined according to the feedback signal.

Images