A multi-power supply system and method

Abstract

The present invention discloses a multi-power supply system and method, wherein a first relay is respectively connected to a control unit, an AC external power supply side, and an AC internal power supply side. 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, 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. On this basis, the present invention realizes arbitrary switching and control of the power supply mode of the AC power supply unit by means of soft switching, avoids isolation by means of physical isolation, and effectively improves the flexibility of switching the power supply mode.

Description

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, energy storage converter) converters include three power supply modes: DC (Direct Current, direct current) power supply, AC (Alternating Current, alternating current) internal power supply and AC external power supply.

[0003] Among them, since the high-power PCS converter is mainly based on the three-phase three-wire system, the AC internal power supply adopts the line voltage to phase voltage transformer for power supply. Since the AC external voltage and the AC internal voltage are inconsistent in amplitude, phase and frequency, the two cannot be used at the same time, and physical isolation is required for foolproof protection (to prevent simultaneous closure and cause short circuit). At present, the isolation method adopted by AC power supply is generally: AC power supply isolates the AC external power supply and the internal power supply miniature circuit breaker through mechanical interlocking (interlocking board) or uses a conversion switch to isolate and interlock. Therefore, only one of the AC internal power supply and AC external power supply can be selected for power supply. If the AC power supply is abnormal, the power supply system cannot adjust the power supply mode in time, and the flexibility and applicability of the power supply system are poor. Summary of the invention

[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.

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

[0006] A multi-power supply system, comprising an AC power supply unit, a DC power supply unit and a control unit; the AC power supply unit comprises 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 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;

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

[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 above multi-power supply system, comprising:

[0011] 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;

[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.

[0013] The beneficial effect of the present invention is that: a first relay is set to connect 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 of the AC external power supply side and the AC internal power supply side, so as to select the AC external power supply side or the AC internal power supply side as the DC power supply unit for power output. 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 realize joint control based on a control unit, without the need for complex calculations and wiring, simplifying the power supply system architecture, reducing the power supply cost, and realizing flexible switching and adjustment of the power supply mode, which can effectively avoid the problem that when one power supply fails, another power supply cannot be used to supply power in time, and improves the reliability and safety of the power supply of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A system architecture diagram of a multi-power supply system provided by an embodiment of the present invention;

[0015] Figure 2 A flowchart of a multi-power supply method provided by 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 terminal; NC, normally closed input terminal; OUT, output terminal; QF1, first miniature circuit breaker; QF2, second miniature circuit breaker; QF3, third miniature circuit breaker; T1, transformer; D1, first diode; D2, second second diode; 3D, drive control signal terminal; 3I, feedback signal receiving 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. DETAILED DESCRIPTION

[0018] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0019] Please refer to Figure 1 , 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 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;

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

[0022] The working principle of the present invention is: when the signal end of the first relay receives the control signal generated by the control unit, the signal end of the first relay generates a driving signal, thereby changing the opening and closing states of the normally closed input end and the normally open input end in the first relay, and the opening and closing states of the first relay determine the conduction states of different power supply side circuits. For example, the normally closed input end of the first relay is currently in a closed state, and the normally open input end of the first relay is currently in a disconnected state. At this time, the DC power supply unit is powered by the AC internal power supply side, because the normally closed input end of the AC internal power supply side connected to the first relay is currently in a closed state, and the circuit is turned on. If at this time, the signal end of the first relay receives the control signal generated by the control unit, the driving signal of the signal end of the first relay changes, causing the normally closed input end of the first relay to switch to an open state, and the normally open input end of the first relay to switch to a closed state. At this time, the DC power supply unit is powered by the AC external power supply side, because the normally open input end of the AC external power supply side connected to the first relay is currently in a closed state, and the circuit is turned on. Thus, the conduction state of the circuit is controlled by the signal end of the first relay.

[0023] From the above description, it can be seen that the beneficial effect of the present invention is that: the first relay is set to connect 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 state 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 of the AC external power supply side and the AC internal power supply side, so as to select the AC external power supply side or the AC internal power supply side as the DC power supply unit for power output. 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 realize joint control based on a control unit, without the need for complex calculations and wiring, simplifying the power supply system architecture, reducing the power supply cost, and realizing flexible switching and adjustment of the power supply mode, which can effectively avoid the problem that when one power supply fails, another power supply cannot be used to supply power in time, and improves the reliability and safety of the power supply of the power supply system.

[0024] Further, 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] It can be seen from the above description that the second relay and the third relay are simultaneously provided in the DC power supply unit, and the second relay and the third relay are respectively controlled by the signal generated by the control unit to generate corresponding drive signals, thereby changing the opening and closing states of the normally closed input terminals thereof, 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 of the power supply system and ensure power supply safety.

[0029] Further, 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 opening and closing 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 completely 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 also 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 first relay is connected to both the AC external power supply side and the AC internal power supply side, 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, so it can be ensured that there is only one power supply circuit between the two, and there is no need to isolate the two through mechanical interlocking, which effectively improves the power supply flexibility.

[0036] Please refer to Figure 2 Another embodiment of the present invention provides a multi-power supply method, which is used in the above-mentioned multi-power supply system, including:

[0037] 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;

[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 power 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 voltage input to the AC power supply unit, it means that there is power 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 that the conduction of the AC external power supply side and the AC internal power supply side can be controlled. The present invention adjusts the control unit to execute different AC power supply strategies through the power supply signal to realize the soft switching of the power supply circuit, so as to achieve the purpose of arbitrary switching and control of the power supply mode of the AC power supply unit, avoiding the limitation of only selecting one power supply mode due to isolation by physical isolation, effectively improving the flexibility of switching the power supply mode, 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-to-DC power supply and a third power supply signal of the DC-to-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-to-DC power supply and / or the DC-to-DC power supply are selected to output a preset voltage value.

[0043] From the above description, it can be seen that when it is detected that the voltage value of the DC power supply unit reaches the preset voltage value, it means that the AC to DC power supply or the DC to DC power supply can supply power at this time, so the corresponding power supply signals of the two are obtained, and the DC power supply strategy is executed by the control unit through the power supply signal, so as to control the AC to DC power supply and the DC to DC power supply to output the preset voltage value. In this way, the AC to DC power supply and the DC to DC power supply can output voltage at the same time, which improves the flexibility of the power supply method.

[0044] Further, executing a preset AC power supply strategy through a 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 is to allow power supply, the control unit drives the signal end of the first relay to generate a first drive signal;

[0046] 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.

[0047] As can be seen from the above description, according to the first power supply signal, the control unit drives the relay to generate a corresponding drive 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 conduction 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 is to allow power supply, the circuit on the AC external power supply side is turned on and the circuit on the AC internal power supply side is turned off, thereby improving the power supply flexibility of the AC power supply unit.

[0048] Further, executing a preset DC power supply strategy through a control unit according to the second power supply signal and the third power supply signal, and selecting the AC-to-DC power supply and / or the DC-to-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-to-DC power supply to turn on the circuit and achieve the effect of power supply by the AC-to-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] Further, executing a preset DC power supply strategy through a control unit according to the second power supply signal and the third power supply signal, and selecting the AC-to-DC power supply and / or the DC-to-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] It can be seen from the above description that when the second power supply signal is not allowed to supply power and the third power supply signal is allowed to supply power, it is only necessary to control the third relay of the direct-to-DC power supply to conduct its circuit and achieve the effect of power supply by the DC-to-DC power supply. In this process, there is no need to control this power supply through the AC-to-DC power supply, and the two power supply control processes are independent of each other, which improves the flexibility of power supply.

[0056] Furthermore, it also includes:

[0057] Detecting the control unit according to the open and closed state to obtain a feedback signal;

[0058] The 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 opening and closing 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 turned on 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, improve power supply flexibility, enrich the power supply mode of the power supply system, and expand the applicable scenarios of the power supply system. The following is an explanation in conjunction with specific embodiments:

[0061] Please refer to Figure 1 , Embodiment 1 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 a normally open input terminal NO of the first relay K1, and the AC internal power supply side 12 is connected to a normally closed input terminal NC of the first relay K1; the output terminal OUT of the first relay K1 is connected to a 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 a signal terminal of the first relay K1 and a 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 phase transformer, which converts the 400V line voltage into a 230V phase voltage. Figure 1 As shown, in the circuit, the AC-N line represents the neutral line, and the AC-L line represents the live line.

[0066] At present, in the relevant technology, DC power supply includes AC / DC power supply and DC / DC power supply, both of which can output 24V voltage. Since the two power supplies are selected by pre-setting the priority level, 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, if Figure 1 As shown, 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 positive electrode of the first diode D1, and the negative electrode 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 positive electrode of the second diode D2, and the negative electrode of the second diode D2 is used to output a preset voltage. In this way, power supply safety is ensured.

[0069] It should be noted that if Figure 1 As shown, the AC-to-DC power supply 21 is an AC / DC power supply, 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, in general, the priority of the battery power supply is higher 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 cause an increase in 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 driving end 3D1, a second driving end 3D2 and a third driving end 3D3, which are then respectively connected to the driving 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 driving end in the control unit 3 may be a switch signal. Figure 1 As shown, the first drive end 3D1 includes a D.1 port and a D.2 port, and the D.1 port and the D.2 port are in a normally closed state; the second drive end 3D2 includes a D.3 port and a D.4 port, and the D.3 port and the D.4 port are in a normally open state; the third drive end 3D3 includes a D.5 port and a D.6 port, and the D.5 port and the D.6 port are in a normally open state; therefore, in the default state, the first drive end 3D1 is in a closed state, the second drive end 3D2 is in an open state, and the third drive end 3D3 is in an open state. Each feedback end in the control unit 3 includes two state feedback ports. Figure 1 As shown, the first feedback terminal 3I1 includes an I.1 port and an I.2 port, the second feedback terminal 3I2 includes an I.3 port and an I.4 port, and the third feedback terminal 3I3 includes an I.5 port and an I.6 port.

[0073] It should be noted that if Figure 1 As shown, A1 and A2 in the figure represent the internal coils of the relay, which are used to attract the switch. For example, when the driving signal terminal KD1 of the first relay K1 receives a voltage signal, based on the voltage difference between the driving signal terminal KD1 at the A1 terminal and the zero line at the A2 terminal, the coil is turned on, so that the coil generates magnetic force, thereby attracting the switch, and the second relay K2 and the third relay K3 are the same.

[0074] In this embodiment, the first drive terminal 3D1 is connected to the drive signal terminal KD1 of the first relay K1 specifically as follows: 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 of the first relay K1 through the first drive terminal 3D1 (D.2 port). The second drive terminal 3D2 is connected to the drive signal terminal KD2 of the second relay K2 specifically as follows: the normally closed input terminal NC of the second relay K2 is connected to the second drive terminal 3D2 (D.3 port), and then connected to the drive signal terminal KD2 of the second relay K2 through the second drive terminal 3D2 (D.4 port). The third drive terminal 3D3 is connected to the drive signal terminal KD3 of the third relay K3 specifically as follows: the normally closed input terminal NC of the third relay K3 is connected to the third drive terminal 3D3 (D.5 port), and then connected to the drive signal terminal KD3 of the third relay K3 through the third drive 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 supply 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 circuit 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 terminal) of the first relay K1 through the first drive terminal 3D1 (D.2 port), and the drive signal terminal KD1 (A2 terminal) of the first relay K1 is connected to the power supply N. The internal coil of the first relay K1 generates 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 conducting 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 to 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, no matter 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, no matter 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 power cannot be supplied 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 a disconnected state, 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 a preset voltage. At this time, the feedback signal terminal KI2 of the second relay K2 is in a high level state 1, and the signal detected by the second feedback terminal 3I2 of the control unit 3 is 1, indicating that the preset voltage is currently output by the AC-DC power supply 21.

[0084] That is, when the AC-to-DC power supply 21 outputs a voltage, the second driving 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-to-DC power supply 21 outputs a 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 a 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 a 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-to-DC power supply 22 is the same as that of the second relay K2, and will not be described in detail here.

[0088] Please refer to Figure 1 and Figure 2 , Embodiment 2 of the present invention is:

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

[0090] S101: When it is detected that an AC power supply unit has voltage input, 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 means: 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 a control unit according to the first power supply signal, and select an AC external power supply side or an AC internal power supply side to supply power to a 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, the 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 opening and closing 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 opening and closing states include a closed state and an open state.

[0097] S1023, detecting the control unit according to the opening and closing state, and obtaining 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, reference Figure 1 As shown, the AC power supply strategy executed by the control unit includes:

[0100] When the first power supply signal is power supply permission, it 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 pull in 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 a low level state 0, and determines that the current AC power supply unit 1 selects the AC external power supply side 11 to supply power to 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, and 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 a high level state 1, and determines that the current AC power supply unit 1 selects the AC internal power supply side 12 to supply power to 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) Since the AC internal power supply side 12 has voltage input first, there is no voltage signal to drive the driving 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 supply power to the DC power supply unit 2.

[0105] (3-2) After a period of time, the AC external power supply side 11 has voltage input, driving the driving signal terminal KD1 of the first relay K1 to close 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 supply power to the DC power supply unit 2.

[0106] When the first power supply signal indicates that power supply is not allowed, the first driving terminal 3D1 of the control unit 3 is switched to a 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 a disconnected state, and the normally closed input terminal NC of the first relay K1 remains in a closed state, and the DC power supply unit 2 cannot be powered by the AC external power supply side 11.

[0107] Embodiment 3 of the present invention is:

[0108] A multi-power supply method, which is different from the second embodiment in that: a power supply method of a DC power supply unit is limited, including:

[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 means: detecting that the voltage state of the AC-to-DC power supply or the DC-to-DC power supply reaches the load voltage value.

[0111] S202: Execute a preset DC power supply strategy through a 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, the 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 and closed state of the normally closed input terminal of the second relay according to the second drive signal.

[0115] S2023a, detecting the control unit according to the opening and closing state, and obtaining 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 implementation, the 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 drive signal.

[0120] S2023b, detect the control unit according to the opening and closing state, and obtain 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 executed by the control unit includes:

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

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

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

[0126] (3) It is detected that the voltage states of the AC to DC power supply 21 and the DC to 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 are both kept in the normally open state, which is the same as the strategy (1) and strategy (2) of this embodiment, and will not be repeated here. At this time, the AC to DC power supply 21 and the DC to DC power supply 22 simultaneously output a 24V voltage to achieve 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 is to allow power supply, 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-to-DC power supply 22 outputs a 24V voltage, and after the load is turned on, the AC-to-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 close 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. Determine that the AC-to-DC power supply 21 is currently selected to output a 24V voltage.

[0129] (5) When the DC-to-DC power supply 22 is in low voltage standby mode, the third power supply signal does not allow power supply, and the second power supply signal allows power supply (i.e., the DC-to-DC power supply 22 is turned off and the AC-to-DC power supply 21 is used to supply power) to prevent the battery from being over-discharged. The third drive terminal 3D3 of the control unit 3 is switched to a closed state, which is the same as after the load is successfully powered on in strategy (4) of this embodiment, and will not be described in detail here. It is determined that the current AC-to-DC power supply 21 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 is switched 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 is switched 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 the same as strategy (2) of this embodiment and will not be repeated 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 connect the control unit, the AC external power supply side and the AC internal power supply side respectively, and then the control unit controls the driving signal end of the first relay, thereby switching 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 of the AC external power supply side and the AC internal power supply side, so as to select the AC external power supply side or the AC internal power supply side as the DC power supply unit for power output. And by switching the driving signal of the control unit, the power supply mode can be quickly adjusted, that is, the arbitrary switching and control of the power supply mode of the AC power supply unit is realized by the soft switch mode, avoiding the isolation by physical isolation, and effectively improving the flexibility of the 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 driving signals respectively, thereby changing the opening and closing 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 to avoid the power supply dependence between the two and realize the arbitrary selection of 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, thus simplifying the power supply system architecture, reducing power supply costs, and realizing flexible switching and adjustment of power supply modes. This 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 power supply 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 specification 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 the signal end of the first relay and the signal end of the DC power supply unit; 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-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; The control unit is connected to the signal ends of the second relay and the third relay respectively; 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 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; The drive control signal end includes a first drive end, each drive end is a switch signal, the first drive end includes a D.1 port and a D.2 port, and the D.1 port and the D.2 port are in a normally closed state; when the first drive end is in a disconnected state, regardless of whether the normally open input end of the first relay receives a voltage signal, the voltage signal cannot be transmitted to the drive signal end of the first relay.

2. A 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.

3. A multi-power supply method, characterized in that: Used in a multi-power supply system as claimed in any one of claims 1 to 2, 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; Executing a preset AC power supply strategy through a 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; 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; executing a preset DC power supply strategy through a control unit according to the second power supply signal and the third power supply signal, and selecting the AC-to-DC power supply and / or the DC-to-DC power supply to output a preset voltage value; 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.

4. A multi-power supply method according to claim 3, 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.

5. The multi-power supply method according to claim 3, 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.

6. A multi-power supply method according to any one of claims 3 to 5, 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.

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