Control circuit and control method for orderly power supply of power supply

Abstract

The invention discloses a control circuit for orderly power supply of a power supply. The control circuit comprises a first power supply input, a second power supply control circuit, a third power supply control circuit, an anti-backflow circuit and an energy storage circuit, the first power supply input is respectively connected with the second power supply control circuit and the power supply output end, the second power supply control circuit is respectively connected with the second power supply input, the third power supply control circuit and the power supply output end, and the third power supply control circuit is respectively connected with the third power supply input, the energy storage circuit and the power supply output end. And the anti-backflow circuit is respectively connected with the first power supply input, the second power supply control circuit and the third power supply control circuit. The invention also discloses a control method for orderly power supply of the power supply. The technical problem of how to control multiple groups of power supplies to supply power orderly without carrying out gradient division on voltage values of the power supplies is solved.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a control circuit and a control method for orderly power supply of a power source. Background Art

[0002] At present, the relevant technical specifications issued by the State Grid generally require that the backup power supply of the power collection terminal has two backup power supply capabilities: nickel-hydrogen batteries and supercapacitors. In addition to the mains power supply, a total of three groups of power supplies are used to power the system. Among them, the mains power provides power to the system first, and when the mains power is off, the backup power supply provides power to the system. The patent document with application number 201910602942.X discloses a power quality detection method, which obtains the power attribute information corresponding to the uninterruptible power supply, and determines the power supply status information between the uninterruptible power supply and different loads according to the power attribute information; according to the power supply status information, the mains power supply status information and / or the battery power supply status information corresponding to the uninterruptible power supply are determined; according to the mains power supply status information and / or the battery power supply status information, the inverter switching status information of the uninterruptible power supply is determined; according to the inverter switching status information, the power quality status information corresponding to the uninterruptible power supply is determined. At present, the voltage gradient design is generally used, that is, by setting the voltage values ​​of the three groups of power supplies to different voltage values, the power supply with high voltage is discharged first, and then the power supply with low voltage is discharged in turn. This method requires that the three groups of power supplies be set to different voltage values ​​within the system power supply voltage range. Therefore, there are two problems that need to be solved. The first is that the voltage of the nickel-hydrogen battery is unstable. The amount of energy stored in the battery and the change in ambient temperature will have a significant impact on the battery voltage value, resulting in the discharge sequence not being consistent with the design expectations. If the nickel-hydrogen battery discharge circuit is designed to be a constant voltage design, this will increase the complexity and cost of the circuit; the second is to divide the voltage of the three groups of power supplies into gradients, which will cause the voltage supplied to the system to change significantly, which may cause abnormal operation of the system. Therefore, it is urgent to propose a control circuit and control method for orderly power supply of power supplies to solve the technical problem of how to control the orderly power supply of multiple groups of power supplies without gradient division of the power supply voltage value. Summary of the invention

[0003] The main purpose of the present invention is to provide a control circuit and a control method for orderly power supply of power supplies, aiming to solve the technical problem of how to control multiple groups of power supplies to supply power in an orderly manner without gradient division of the power supply voltage value.

[0004] To achieve the above object, the present invention provides a control circuit for orderly power supply of a power supply, wherein the control circuit for orderly power supply of a power supply comprises:

[0005] A first power input, a second power control circuit, a third power control circuit, an anti-backflow circuit and an energy storage circuit; the first power input is respectively connected to the second power control circuit and the power output terminal, the second power control circuit is respectively connected to the second power input, the third power control circuit and the power output terminal, the third power control circuit is respectively connected to the third power input, the energy storage circuit and the power output terminal, and the anti-backflow circuit is respectively connected to the first power input, the second power control circuit and the third power control circuit.

[0006] In one of the preferred solutions, the first power input is a mains power supply.

[0007] In one of the preferred solutions, the anti-backflow circuit includes a first anti-backflow circuit; the first anti-backflow circuit includes a diode V1; the anode of the diode V1 is connected to the first power input, and the cathode of the diode V1 is connected to the power output terminal.

[0008] In one of the preferred schemes, the second power control circuit includes a resistor R1, a capacitor C1 and a MOS tube V3; the gates of the resistor R1, the capacitor C1 and the MOS tube V3 are connected to the first power input, the other ends of the resistor R1 and the capacitor C1 are grounded, the source of the MOS tube V3 is connected to the second power input, and the drain of the MOS tube V3 is connected to the power output end.

[0009] In one of the preferred solutions, the anti-backflow circuit includes a second anti-backflow circuit; the second anti-backflow circuit includes a diode V4; the anode of the diode V4 is connected to the drain of the MOS tube V3, and the cathode of the diode V4 is connected to the power output terminal.

[0010] In one of the preferred solutions, the second power input is a backup power supply supplied by a super capacitor through power conversion.

[0011] In one of the preferred schemes, the third power supply control circuit includes a diode V2, a resistor R2, a capacitor C2 and a MOS tube V5; the anode of the diode V2 is connected to the first power supply input, the cathode of the diode V2 is respectively connected to the resistor R2, the capacitor C2, the gate of the MOS tube V5 and the second power supply control circuit, the other ends of the resistor R2 and the capacitor C2 are grounded, the source of the MOS tube V5 is connected to the third power supply input, and the drain of the MOS tube V5 is connected to the power supply output end.

[0012] In one of the preferred solutions, the anti-backflow circuit includes a third anti-backflow circuit; the third anti-backflow circuit includes a diode V6, an anode of the diode V6 is connected to the third power supply input, and a cathode of the diode V6 is connected to the source of the MOS tube V5.

[0013] In one of the preferred solutions, the third power input is a backup power supply powered by a nickel-hydrogen battery.

[0014] A control method including the control circuit for orderly power supply of a power source, comprising the following steps:

[0015] Determine whether the first power input has power, and if so, give priority to the first power input for power supply;

[0016] If not, determine whether the second power input has power, and if so, supply power from the second power input;

[0017] If not, determine whether the third power input has power, and if so, supply power from the third power input;

[0018] If not, the system powers down.

[0019] In the above technical solution of the present invention, the control circuit for orderly power supply of power includes: a first power input, a second power control circuit, a third power control circuit, an anti-backflow circuit and an energy storage circuit; the first power input is respectively connected to the second power control circuit and the power output terminal, the second power control circuit is respectively connected to the second power input, the third power control circuit and the power output terminal, the third power control circuit is respectively connected to the third power input, the energy storage circuit and the power output terminal, and the anti-backflow circuit is respectively connected to the first power input, the second power control circuit and the third power control circuit. The present invention realizes orderly power supply to multiple groups of power supplies by setting the second power control circuit and the third power control circuit, without gradient division of the voltage value of the power supply, allowing the voltage value of each power supply to be the same, which is conducive to the consistency of the power supply voltage, and has good redundancy for the situation where the voltage value of the nickel-hydrogen battery power supply changes, solving the technical problem of how to control the orderly power supply of multiple groups of power supplies without gradient division of the voltage value of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of the structure of a control circuit for orderly power supply of a power supply according to an embodiment of the present invention;

[0022] Figure 2 A circuit diagram of a control circuit for orderly power supply of a power source according to an embodiment of the present invention;

[0023] Figure 3A schematic diagram of a control method for orderly power supply of a power supply according to an embodiment of the present invention.

[0024] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0027] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] See also Figure 1-Figure 2 According to one aspect of the present invention, the present invention provides a control circuit for orderly power supply of a power supply, wherein the control circuit for orderly power supply of a power supply comprises:

[0029] A first power input, a second power control circuit, a third power control circuit, an anti-backflow circuit and an energy storage circuit; the first power input is respectively connected to the second power control circuit and the power output terminal, the second power control circuit is respectively connected to the second power input, the third power control circuit and the power output terminal, the third power control circuit is respectively connected to the third power input, the energy storage circuit and the power output terminal, and the anti-backflow circuit is respectively connected to the first power input, the second power control circuit and the third power control circuit.

[0030] Specifically, in this embodiment, the first power input is a mains power supply.

[0031] Specifically, in this embodiment, the anti-backflow circuit includes a first anti-backflow circuit; the first anti-backflow circuit includes a diode V1; the anode of the diode V1 is connected to the first power supply input, the cathode of the diode V1 is connected to the power supply output end, and the diode V1 is used to prevent the first power supply input from backflow.

[0032] Specifically, in the present embodiment, the second power control circuit comprises a resistor R1, a capacitor C1 and a MOS tube V3; the gates of the resistor R1, the capacitor C1 and the MOS tube V3 are connected to the first power input, the other ends of the resistor R1 and the capacitor C1 are grounded, the source of the MOS tube V3 is connected to the second power input, and the drain of the MOS tube V3 is connected to the power output end; after the first power is cut off, the resistor R1 can maintain the gate of the MOS tube V3 at a low level, and the MOS tube V3 is slowly started by setting the capacitor C1.

[0033] Specifically, in this embodiment, the MOS tube V3 is a PMOS tube, which is an n-type substrate, a p-channel, and a MOS tube that relies on the flow of holes to move current. When the voltage between the gate voltage and the source voltage is less than a threshold, the MOS tube V3 is turned on.

[0034] Specifically, in this embodiment, the anti-backflow circuit includes a second anti-backflow circuit; the second anti-backflow circuit includes a diode V4; the anode of the diode V4 is connected to the drain of the MOS tube V3, and the cathode of the diode V4 is connected to the power supply output end, and the diode V4 is used to prevent the second power supply input from backflow.

[0035] Specifically, in this embodiment, the second power input is a backup power supply supplied by a super capacitor through power conversion.

[0036] Specifically, in this embodiment, the third power control circuit includes a diode V2, a resistor R2, a capacitor C2 and a MOS tube V5; the anode of the diode V2 is connected to the first power input, the cathode of the diode V2 is respectively connected to the resistor R2, the capacitor C2, the gate of the MOS tube V5 and the second power control circuit, the other ends of the resistor R2 and the capacitor C2 are grounded, the source of the MOS tube V5 is connected to the third power input, and the drain of the MOS tube V5 is connected to the power output end; after the second power supply is powered off, the resistor R2 can maintain the gate of the MOS tube V5 at a low level, and at the same time, the MOS tube V4 is slowly started through the capacitor C2.

[0037] Specifically, in this embodiment, the MOS tube V5 is a PMOS tube, which is an n-type substrate, a p-channel, and a MOS tube that relies on the flow of holes to move current. When the voltage between the gate voltage and the source voltage is less than a threshold, the MOS tube V5 is turned on.

[0038] Specifically, in this embodiment, the anti-backflow circuit includes a third anti-backflow circuit; the third anti-backflow circuit includes a diode V6, the anode of the diode V6 is connected to the third power supply input, the cathode of the diode V6 is connected to the source of the MOS tube V5, and the diode V6 is used to prevent the third power supply input from backflow.

[0039] Specifically, in this embodiment, the third power input is a backup power supply powered by a nickel-hydrogen battery.

[0040] Specifically, in this embodiment, the first power input is a mains power supply, the second power input is a backup power supply powered by a supercapacitor through power conversion, the supercapacitor is between a battery and a capacitor, its extremely large capacitance can be used as a battery, and it has good reversibility, high long-term and discharge efficiency; the third power input is a backup power supply powered by a nickel-hydrogen battery.

[0041] Specifically, in this embodiment, the energy storage circuit includes a resistor R3 and a capacitor C3; one end of the resistor R3 is connected to the capacitor C3 and the drain of the MOS tube V5, and the other ends of the resistor R3 and the capacitor C3 are connected to the ground; the capacitor C3 is used to start energy storage, and during the power switching process, a large drop in the voltage at the power output end can be avoided, thereby maintaining the stability of the system power supply.

[0042] Specifically, in the present embodiment, when the first power input V5P0 is powered, the MOS tube V3 and the MOS tube V5 are not turned on, and the first power input outputs the power V5P0_OUT; when the first power input V5P0 is powered off, if the second power input V5P0_CAP is powered on, the MOS tube V3 is turned on, the MOS tube V5 is not turned on, and the second power input supplies power to output the power V5P0_OUT; when the first power input V5P0 and the second power input V5P0_CAP are both powered off, the MOS tube V5 is turned on, and the third power input V5P0_BAT supplies power to output the power V5P0_OUT.

[0043] See also Figure 3 According to another aspect of the present invention, the present invention provides a control method for orderly power supply of a power supply, wherein the control method for orderly power supply of a power supply comprises the following steps:

[0044] Determine whether the first power input has power, and if so, give priority to the first power input for power supply;

[0045] If not, determine whether the second power input has power, and if so, supply power from the second power input;

[0046] If not, determine whether the third power input has power, and if so, supply power from the third power input;

[0047] If not, the system powers down.

[0048] Specifically, in this embodiment, the present invention is explained by taking a 5V system power supply and a system operating voltage range of 4.6V-5.2V as an example. The first power input is a main power supply 5V supplied by the AC power supply, represented by V5P0, the second power input is a backup power supply 5V after power conversion by a supercapacitor, represented by V5P0_CAP, and the third power input is a backup power supply powered by a nickel-hydrogen battery, represented by V5P0_BAT; the discharge sequence is that when the first power input has power, the first power input is used for power supply first, after the first power input is powered off, the second power input is used for power supply first, and when the first power input and the second power input are both powered off, the third power input is used for power supply.

[0049] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A control circuit for orderly power supply, characterized in that: include: A first power input, a second power control circuit, a third power control circuit, an anti-backflow circuit and an energy storage circuit; the first power input is respectively connected to the second power control circuit and the power output terminal, the second power control circuit is respectively connected to the second power input, the third power control circuit and the power output terminal, the third power control circuit is respectively connected to the third power input, the energy storage circuit and the power output terminal, and the anti-backflow circuit is respectively connected to the first power input, the second power control circuit and the third power control circuit.

2. A control circuit for orderly power supply according to claim 1, characterized in that: The first power input is a mains power supply.

3. A control circuit for orderly power supply according to any one of claims 1 to 2, characterized in that: The anti-backflow circuit includes a first anti-backflow circuit; the first anti-backflow circuit includes a diode V1; the anode of the diode V1 is connected to the first power input, and the cathode of the diode V1 is connected to the power output terminal.

4. A control circuit for orderly power supply according to any one of claims 1 to 2, characterized in that: The second power control circuit includes a resistor R1, a capacitor C1 and a MOS tube V3; the gates of the resistor R1, the capacitor C1 and the MOS tube V3 are connected to the first power input, the other ends of the resistor R1 and the capacitor C1 are grounded, the source of the MOS tube V3 is connected to the second power input, and the drain of the MOS tube V3 is connected to the power output end.

5. A control circuit for orderly power supply according to claim 4, characterized in that: The anti-backflow circuit includes a second anti-backflow circuit; the second anti-backflow circuit includes a diode V4; the anode of the diode V4 is connected to the drain of the MOS tube V3, and the cathode of the diode V4 is connected to the power output terminal.

6. A control circuit for orderly power supply according to claim 4, characterized in that: The second power input is a backup power supply supplied by a super capacitor through power conversion.

7. A control circuit for orderly power supply according to any one of claims 1 to 2, characterized in that: The third power supply control circuit includes a diode V2, a resistor R2, a capacitor C2 and a MOS tube V5; the anode of the diode V2 is connected to the first power supply input, the cathode of the diode V2 is respectively connected to the resistor R2, the capacitor C2, the gate of the MOS tube V5 and the second power supply control circuit, the other ends of the resistor R2 and the capacitor C2 are grounded, the source of the MOS tube V5 is connected to the third power supply input, and the drain of the MOS tube V5 is connected to the power supply output end.

8. A control circuit for orderly power supply according to claim 7, characterized in that: The anti-backflow circuit includes a third anti-backflow circuit; the third anti-backflow circuit includes a diode V6, an anode of the diode V6 is connected to the third power input, and a cathode of the diode V6 is connected to the source of the MOS tube V5.

9. A control circuit for orderly power supply according to claim 7, characterized in that: The third power input is a backup power supply powered by a nickel-hydrogen battery.

10. A control method comprising a control circuit for orderly power supply according to any one of claims 1 to 9, characterized in that: The following steps are involved: Determine whether the first power input has power, and if so, give priority to the first power input for power supply; If not, determine whether the second power input has power, and if so, supply power from the second power input; If not, determine whether the third power input has power, and if so, supply power from the third power input; If not, the system powers down.

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