Electric energy management circuit and electric energy management system

Abstract

The invention relates to an electric energy management circuit and an electric energy management system. The electric energy management circuit can control the discharge module to discharge redundant electric energy flowing into the electric energy management circuit through the voltage comparison module; part of electric energy can be stored through the energy storage module, and when the voltage accessed to the load is smaller than or equal to the minimum starting voltage of the load, the circuit switching module closes the first switch to enable the voltage conversion module and the energy storage module to jointly supply power to the load, and when the voltage accessed to the load is larger than the minimum starting voltage of the load, the circuit switching module closes the second switch to enable the voltage conversion module and the energy storage module to jointly supply power to the load. The first switch is switched off, so that the voltage conversion module independently supplies power to the load; and meanwhile, a rectification module is also arranged in the electric energy management circuit, and a stable direct-current electric signal can be obtained through the rectification module, so that a stable direct-current power supply is provided for the load. The electric energy management circuit can continuously monitor the operation state of the power transmission line through the voltage comparison module, and can store part of electric energy, thereby saving energy.

Description

Technical Field

[0001] The present application relates to the technical field of electric energy management, and in particular to an electric energy management circuit and an electric energy management system. Background Art

[0002] With the development of smart grids, the requirements for monitoring the operating status of transmission lines are increasing. In traditional technologies, electrical quantity integrated sensors with multiple monitoring functions are often used to monitor the operating status of transmission lines. Although electrical quantity integrated sensors improve the comprehensiveness and efficiency of monitoring, each monitoring function needs to run independently and consumes electricity. Moreover, if continuous real-time high-precision data collection and transmission are achieved, power consumption will be further increased. Therefore, under traditional methods, monitoring the operating status of transmission lines cannot take into account both power consumption and monitoring continuity. Summary of the invention

[0003] Based on this, it is necessary to provide an electric energy management circuit and an electric energy management system that take into account both energy loss and monitoring continuity.

[0004] In a first aspect, a power management circuit is provided, comprising:

[0005] A current transformer, the current transformer is coupled to a power transmission line of a power grid;

[0006] A rectifier module, a discharge module, a voltage conversion module and a circuit switching module are sequentially connected in series between the current transformer and the load;

[0007] A voltage comparison module, wherein the input end of the voltage comparison module is connected to the output end of the discharge module, and the control end of the voltage comparison module is connected to the controlled end of the discharge module; the voltage comparison module is used to control the discharge module to discharge electrical energy when the received electrical signal is greater than a first discharge threshold value;

[0008] An energy storage module, the input end of the energy storage module is connected to the output end of the discharge module;

[0009] A first switch, wherein an input end of the first switch is connected to an output end of the energy storage module;

[0010] The circuit switching module is also connected to the output end of the energy storage module through a first switch, and is used to close the first switch when the voltage connected to the load is less than or equal to the minimum starting voltage of the load, so that the voltage conversion module and the energy storage module jointly power the load; when the voltage connected to the load is greater than the minimum starting voltage of the load, the first switch is opened so that the voltage conversion module alone powers the load.

[0011] In one embodiment, the power management circuit includes:

[0012] A second switch is connected in series between the output end of the discharge module and the input end of the energy storage module;

[0013] The circuit switching module is also connected to the controlled end of the second switch and is used to disconnect the second switch when the voltage connected to the load is less than or equal to the rated voltage of the load. The circuit switching module is also used to close the second switch when the voltage connected to the load is greater than the rated voltage of the load.

[0014] In one embodiment, the discharge module comprises:

[0015] A first discharge switch, wherein a first end of the first discharge switch is connected to an output end of the rectifier module, and a controlled end of the first discharge switch is connected to a voltage comparison module;

[0016] A first branch, wherein an input end of the first branch is connected to a second end of the first discharge switch, and an output end of the first branch is connected to a voltage conversion module;

[0017] A second branch, wherein at least one discharge resistor is disposed on the second branch, an input end of the second branch is connected to the third end of the first discharge switch, an output end of the second branch is connected to the voltage conversion module, and the second branch is used to discharge electric energy through each discharge resistor;

[0018] The voltage comparison module is used to select the first end and the second end of the first discharge switch to be turned on when the received electrical signal is less than or equal to the first discharge threshold; the voltage comparison module is also used to select the first end and the third end of the first discharge switch to be turned on when the received electrical signal is greater than the first discharge threshold.

[0019] In one embodiment, the first discharge threshold is a threshold determined according to a charging safety threshold of the energy storage module and a rated voltage of the load.

[0020] In one embodiment, the second branch includes: a second discharge switch, a third discharge switch, a first discharge resistor, a second discharge resistor and a third discharge resistor;

[0021] The first end of the second discharge switch is connected to the third end of the first discharge switch, the second end of the second discharge switch is connected to the first end of the third discharge switch via the second discharge resistor, the third end of the second discharge switch is grounded via the first discharge resistor, and the controlled end of the second discharge switch is connected to the voltage comparison module;

[0022] The second end of the third discharge switch is connected to the voltage conversion module, the third end of the third discharge switch is connected to the voltage conversion module via the third discharge resistor, and the controlled end of the third discharge switch is connected to the voltage comparison module;

[0023] The voltage comparison module is also used for driving the first and second ends of the second discharge switch and the first and third ends of the third discharge switch to connect when the received electrical signal is greater than the first discharge threshold;

[0024] The voltage comparison module drives the first end and the second end of the second discharge switch and the first end and the second end of the third discharge switch to connect when the received electrical signal is greater than the second discharge threshold;

[0025] The voltage comparison module drives the first end and the third end of the second discharge switch to connect when the received electrical signal is greater than the third discharge threshold;

[0026] The first discharge threshold is smaller than the second discharge threshold, and the second discharge threshold is smaller than the third discharge threshold.

[0027] In one embodiment, the power management circuit further includes:

[0028] The protection module is connected in series between the output end of the current transformer and the rectifier module.

[0029] In one embodiment, the protection module further includes:

[0030] A third switch connected in series between the current transformer and the load;

[0031] A protection control circuit, wherein the control end of the protection control circuit is connected to the controlled end of the third switch; the protection control circuit is used to monitor the current signal of the input current transformer, and disconnect the third switch when the current signal is greater than a first safety threshold; the protection module is also used to close the third switch when the current signal is less than or equal to the first safety threshold.

[0032] In one embodiment, the power management circuit further includes:

[0033] A fourth switch, the fourth switch is connected in series between the output end of the circuit switching module and the load;

[0034] The protection module is also used to connect the load and disconnect the fourth switch when the electrical signal connected to the load is greater than the second safety threshold; the protection module also closes the fourth switch when the electrical signal connected to the load is less than or equal to the second safety threshold, and the second safety threshold is greater than the rated voltage of the load.

[0035] In one embodiment, the power management circuit further includes:

[0036] A filter module, wherein the input end of the filter module is connected to the output end of the discharge module, and the output end of the filter module is respectively connected to the voltage comparison module and the voltage conversion module.

[0037] In a second aspect, a power management system is provided, comprising the above-mentioned power management circuit and a load.

[0038] The above-mentioned power management circuit and power management system can control the discharge module to discharge the excess power flowing into the power management circuit through the voltage comparison module; the power management circuit also adds an energy storage module to store part of the power, and when the voltage connected to the load is less than or equal to the minimum starting voltage of the load, the circuit switching module closes the first switch so that the voltage conversion module and the energy storage module jointly supply power to the load, and when the voltage connected to the load is greater than the minimum starting voltage of the load, the first switch is disconnected so that the voltage conversion module alone supplies power to the load; at the same time, a rectifier module is also provided in the power management circuit, and a stable DC signal can be obtained through the rectifier module, thereby providing a stable DC power supply for the load. Therefore, the power management circuit can continuously monitor the operation status of the transmission line through the voltage comparison module, and can also store part of the power when the power consumption of the load is met, so as to input it into the load when the output voltage of the power grid transmission line is not enough to support the normal operation of the load, thereby saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 This is one of the structural block diagrams of a power management circuit according to an embodiment;

[0041] Figure 2 This is a second structural block diagram of a power management circuit according to an embodiment;

[0042] Figure 3 FIG. 4 is a structural block diagram of a discharge module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0045] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first switch may be referred to as a second switch, and similarly, a second switch may be referred to as a first switch. Both the first switch and the second switch are switches, but they are not the same switch.

[0046] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0047] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0048] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0049] In one embodiment, Figure 1 As shown, an energy management circuit 100 is provided, including: a current transformer 102, a rectifier module 104 connected in series between the current transformer 102 and a load 200, a discharge module 106, a voltage conversion module 108 and a circuit switching module 110, a voltage comparison module 112, an energy storage module 114 and a first switch 116.

[0050] The current transformer 102 is coupled to the power transmission line of the power grid.

[0051] The rectifier module 104 is used to rectify the AC signal output by the current transformer 102 into a DC signal to provide a stable DC signal for each module in the subsequent circuit. The discharge module 106 is used to release or consume excess power through components such as resistors, thereby protecting the entire power management circuit 100 from damage caused by power accumulation. The voltage conversion module 108 is used to step up or step down the voltage input to the voltage conversion module 108 to a voltage that matches the working voltage of the load 200, thereby ensuring that the load 200 can work normally.

[0052] The input end of the voltage comparison module 112 is connected to the output end of the discharge module 106, and the control end of the voltage comparison module 112 is connected to the controlled end of the discharge module 106; the voltage comparison module 112 is used to control the discharge module 106 to discharge electrical energy when the received electrical signal is greater than the first discharge threshold.

[0053] When the received electrical signal of the voltage comparison module 112 is greater than the first discharge threshold, it indicates that the output power of the power grid transmission line is large; when the received electrical signal is less than or equal to the first discharge threshold, it indicates that the output power of the power grid transmission line is within a normal range. Therefore, the voltage comparison module 112 can continuously monitor the operating state of the transmission line through the received electrical signal, and control the discharge of electric energy when the received electrical signal is too large.

[0054] An input end of the energy storage module 114 is connected to an output end of the discharge module 106 .

[0055] An input end of the first switch 116 is connected to an output end of the energy storage module 114 .

[0056] The circuit switching module 110 is also connected to the output end of the energy storage module 114 through the first switch 116, and is used to close the first switch 116 when the voltage connected to the load 200 is less than or equal to the minimum starting voltage of the load 200, so that the voltage conversion module 108 and the energy storage module 114 jointly supply power to the load 200; when the voltage connected to the load 200 is greater than the minimum starting voltage of the load 200, the first switch 116 is disconnected, so that the voltage conversion module 108 alone supplies power to the load 200.

[0057] When the voltage comparison module 112 receives an electrical signal output by the discharge module 106 that is greater than the first discharge threshold, the discharge module 106 is controlled to discharge the electric energy; when the voltage comparison module 112 receives an electrical signal output by the discharge module 106 that is less than or equal to the first discharge threshold, the electrical signal output by the discharge module 106 flows to the subsequent circuit via the voltage conversion module 108 and the energy storage module 114 to power the load 200.

[0058] The electrical signal output by the discharge module 106 can be input to the energy storage module 114 for storage, so that when the voltage connected to the load 200 is less than or equal to the minimum starting voltage of the load 200, the circuit switching module 110 closes the first switch 116, so that the voltage conversion module 108 and the energy storage module 114 jointly supply power to the load 200. The load 200 can be a module or device with a function of monitoring the power grid; the minimum starting voltage can be 3.3V.

[0059] Therefore, the above-mentioned power management circuit 100 can control the discharge module 106 to discharge the excess power flowing into the power management circuit 100 through the voltage comparison module 112; a new energy storage module 114 is also added to the power management circuit 100 to store part of the power, and when the voltage connected to the load 200 is less than or equal to the minimum starting voltage of the load 200, the circuit switching module 110 closes the first switch 116 so that the voltage conversion module 108 and the energy storage module 114 jointly supply power to the load 200, and when the voltage connected to the load 200 is greater than the minimum starting voltage of the load 200, the first switch 116 is disconnected so that the voltage conversion module 108 supplies power to the load 200 alone; at the same time, a rectifier module 104 is also provided in the power management circuit 100, and a stable DC signal can be obtained through the rectifier module 104, thereby providing a stable DC power supply for the load 200. Therefore, the power management circuit 100 can continuously monitor the operating status of the transmission line through the voltage comparison module 112, and can also store part of the electric energy while meeting the power consumption of the load 200, so as to input it to the load 200 when the output voltage of the power grid transmission line is not sufficient to support the normal operation of the load 200, thereby saving energy.

[0060] In one embodiment, Figure 2 As shown, the power management circuit 100 further includes a second switch 118 .

[0061] The second switch 118 is connected in series between the output terminal of the discharge module 106 and the input terminal of the energy storage module 114 .

[0062] The circuit switching module 110 is also connected to the controlled end of the second switch 118 and is used to disconnect the second switch 118 when the voltage connected to the load 200 is less than or equal to the rated voltage of the load 200. The circuit switching module 110 is also used to close the second switch 118 when the voltage connected to the load 200 is greater than the rated voltage of the load 200.

[0063] When the voltage connected to the load 200 is less than or equal to the rated voltage of the load 200, the second switch 118 is disconnected, and charging to the load 200 is stopped, so that the electric energy flows into the load through the voltage conversion module 108. When the voltage connected to the load 200 is greater than the rated voltage of the load 200, it indicates that the load 200 can only obtain the rated voltage under the output electrical signal of the voltage conversion module 108. At this time, the second switch 118 can be closed to flow part of the electric energy into and store it in the energy storage module 114, so as to prevent the load 200 from working in a voltage environment higher than the rated voltage, protect the load 200, and avoid the waste of electric energy.

[0064] Among them, the rated voltage may be 5V.

[0065] In one embodiment, Figure 3As shown, the discharge module 106 includes a first discharge switch (such as Figure 3 SW1 in), the first branch (such as Figure 3 L1 in the Figure 3 in L2).

[0066] A first end of the first discharge switch is connected to the output end of the rectifier module 104 , and a controlled end of the first discharge switch is connected to the voltage comparison module 112 .

[0067] The input end of the first branch is connected to the second end of the first discharge switch, and the output end of the first branch is connected to the voltage conversion module 108 .

[0068] At least one discharge resistor is provided on the second branch, the input end of the second branch is connected to the third end of the first discharge switch, the output end of the second branch is connected to the voltage conversion module 108, and the second branch is used to discharge discharge energy through each discharge resistor.

[0069] The voltage comparison module 112 is used to select the first end and the second end of the first discharge switch to be turned on when the received electrical signal is less than or equal to the first discharge threshold; the voltage comparison module 112 is also used to select the first end and the third end of the first discharge switch to be turned on when the received electrical signal is greater than the first discharge threshold.

[0070] The discharge speed of the discharge module 106 is related to the components constituting the discharge module 106. Taking the resistor as an example, the larger the resistance value in the discharge module 106, the slower the discharge speed; correspondingly, the smaller the resistance value in the discharge module 106, the faster the discharge speed. Therefore, the discharge speed can be controlled by adjusting the resistance value of the discharge module 106. Therefore, at least one discharge resistor can be set on the second branch to obtain a suitable discharge speed.

[0071] The output end of the first branch is directly connected to the voltage conversion module 108. When the received electrical signal is less than or equal to the first discharge threshold, the voltage comparison module 112 selects to turn on the first end and the second end of the first discharge switch, so that the discharge module 106 transmits electric energy to the voltage comparison module 112 through the first branch. At least one discharge resistor is set on the second branch. When the received electrical signal is greater than the first discharge threshold, the voltage comparison module 112 selects to turn on the first end and the third end of the first discharge switch, so that the discharge module 106 discharges the electric energy through the discharge resistor on the second branch, and then transmits the remaining electric energy to the voltage comparison module 112. Therefore, the voltage comparison module 112 can monitor the output electrical signal of the discharge module 106 in real time to control the discharge module 106 in real time, thereby protecting the entire power management circuit 100 from damage caused by the accumulation of electric energy and improving the reliability and stability of the power management circuit 100.

[0072] In one embodiment, the first discharge threshold is a threshold determined according to a charging safety threshold of the energy storage module 114 and a rated voltage of the load 200 .

[0073] The charging safety threshold is the maximum charging voltage that the energy storage module 114 can withstand.

[0074] A voltage greater than the first discharge threshold is characterized as a voltage greater than the sum of the charging safety threshold of the energy storage module 114 and the rated voltage of the load 200. At this time, if the voltage greater than the first discharge threshold continues to be input into the discharge module 106, the energy storage module 114 and the load 200, there is a risk of damaging or even burning the energy storage module 114 and the load 200. Therefore, the first discharge threshold can ensure the safe operation of the power management circuit 100.

[0075] In one embodiment, Figure 3 As shown, the second branch includes: a second discharge switch (such as Figure 3 SW2 in), the third discharge switch (such as Figure 3 SW3 in), the first bleeder resistor (such as Figure 3 R1 in the figure), the second bleeder resistor (such as Figure 3 R2 in the figure) and the third bleeder resistor (such as Figure 3 R3 in ).

[0076] The first end of the second discharge switch is connected to the third end of the first discharge switch, the second end of the second discharge switch is connected to the first end of the third discharge switch via the second discharge resistor, the third end of the second discharge switch is grounded via the first discharge resistor, and the controlled end of the second discharge switch is connected to the voltage comparison module 112.

[0077] The second end of the third discharge switch is connected to the voltage conversion module 108 , the third end of the third discharge switch is connected to the voltage conversion module 108 via the third discharge resistor, and the controlled end of the third discharge switch is connected to the voltage comparison module 112 .

[0078] The voltage comparison module 112 is also used to drive the first and second terminals of the second discharge switch and the first and third terminals of the third discharge switch when the received electrical signal is greater than the first discharge threshold. At this time, the electrical energy input to the discharge module 106 is discharged through the second discharge resistor and the third discharge resistor.

[0079] When the received electrical signal is greater than the second discharge threshold, the voltage comparison module 112 drives the first end and the second end of the second discharge switch and the first end and the second end of the third discharge switch to connect. At this time, the electrical energy input to the discharge module 106 is discharged through the second discharge resistor. Since the resistance of a single second discharge resistor is reduced compared to the resistance of the second discharge resistor connected in series with the third discharge resistor, the speed of discharging electrical energy is increased.

[0080] When the received electrical signal is greater than the third discharge threshold, the voltage comparison module 112 drives the first terminal and the third terminal of the second discharge switch to connect. At this time, the electrical energy input to the discharge module 106 is discharged to the ground through the first discharge resistor. To further speed up the discharge speed, the first discharge resistor can be a resistor with a resistance value smaller than that of the second discharge resistor.

[0081] The first discharge threshold is smaller than the second discharge threshold, and the second discharge threshold is smaller than the third discharge threshold. For example, the first discharge threshold may be 6V, the second discharge threshold may be 8V, and the third discharge threshold may be 10V.

[0082] Furthermore, the discharge module 106 may also be any module that adjusts the discharge speed by adjusting the resistance value.

[0083] In one embodiment, Figure 2 As shown, the power management circuit 100 further includes a protection module 120 .

[0084] The protection module 120 is connected in series between the output end of the current transformer 102 and the rectifier module 104 .

[0085] The protection module 120 is used to prevent circuit failure and device damage caused by internal factors or external factors of the power management circuit 100, thereby ensuring the normal operation of the power management circuit 100.

[0086] In one embodiment, Figure 2 As shown, the protection module 120 further includes: a third switch 1202 and a protection control circuit 1204 connected in series between the current transformer 102 and the load 200 .

[0087] The control end of the protection control circuit 1204 is connected to the controlled end of the third switch 1202; the protection control circuit 1204 is used to monitor the current signal of the input current transformer 102, and disconnect the third switch 1202 when the current signal is greater than the first safety threshold; the protection module 120 is also used to close the third switch 1202 when the current signal is less than or equal to the first safety threshold.

[0088] The first safety threshold is the maximum electrical signal value at which the power management circuit 100 can operate normally and stably. When the current signal of the input current transformer 102 is greater than the first safety threshold, if the current signal is transmitted backward, there is a risk of damaging the power management circuit 100. At this time, the protection control circuit 1204 can control the disconnection of the third switch 1202 to prevent the current signal from being transmitted backward. Correspondingly, when the current signal of the input current transformer 102 is less than or equal to the first safety threshold, it can be considered that the power management circuit 100 can operate normally and stably under the current signal. At this time, the protection control circuit 1204 can control the closing of the third switch 1202 to allow the current signal to be transmitted backward.

[0089] In one embodiment, Figure 2 As shown, the power management circuit 100 further includes a fourth switch 122 .

[0090] The fourth switch 122 is connected in series between the output terminal of the circuit switching module 110 and the load 200 .

[0091] The protection module 120 is also used to connect the load 200 and disconnect the fourth switch 122 when the electrical signal connected to the load 200 is greater than the second safety threshold; the protection module 120 also closes the fourth switch 122 when the electrical signal connected to the load 200 is less than or equal to the second safety threshold, and the second safety threshold is greater than the rated voltage of the load 200.

[0092] The second safety threshold is the maximum electrical signal value at which the load 200 can operate normally and stably.

[0093] The protection module 120 monitors the electrical signal of the input load 200. When the electrical signal is greater than the second safety threshold, the fourth switch 122 is disconnected to prevent the excessive electrical signal from damaging or even burning the load 200. When the electrical signal is less than or equal to the second safety threshold, the fourth switch 122 is closed to maintain stable operation of the load 200.

[0094] In one embodiment, Figure 2 As shown, the power management circuit 100 further includes a filter module 124 .

[0095] An input end of the filter module 124 is connected to an output end of the discharge module 106 , and an output end of the filter module 124 is connected to the voltage comparison module 112 and the voltage conversion module 108 , respectively.

[0096] The filter module 124 is used to filter the electrical signal output by the discharge module 106 to obtain a stable electrical signal, thereby improving the stability and accuracy of the voltage comparison module 112 and the circuit switching module 110 when comparing the electrical signal.

[0097] In one embodiment, a power management system includes the above-mentioned power management circuit and a load.

[0098] The power management system equipped with the power management circuit can realize continuous self-detection of the power grid transmission lines. At the same time, it can also store part of the electric energy while meeting the power consumption of the load, so as to input it to the load when the output voltage of the power grid transmission line is not enough to support the normal operation of the load, thereby saving energy.

[0099] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0100] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A power management circuit, characterized in that: include: A current transformer, the current transformer being coupled to a power grid transmission line; A rectifier module, a discharge module, a voltage conversion module and a circuit switching module are sequentially connected in series between the current transformer and the load; A voltage comparison module, wherein the input end of the voltage comparison module is connected to the output end of the discharge module, and the control end of the voltage comparison module is connected to the controlled end of the discharge module; the voltage comparison module is used to control the discharge module to discharge electrical energy when the received electrical signal is greater than a first discharge threshold value; An energy storage module, the input end of which is connected to the output end of the discharge module; A first switch, wherein an input end of the first switch is connected to an output end of the energy storage module; The circuit switching module is also connected to the output end of the energy storage module through the first switch, and is used to close the first switch when the voltage connected to the load is less than or equal to the minimum starting voltage of the load, so that the voltage conversion module and the energy storage module jointly power the load; when the voltage connected to the load is greater than the minimum starting voltage of the load, open the first switch so that the voltage conversion module alone powers the load.

2. The circuit according to claim 1, characterized in that Also includes: A second switch is connected in series between the output end of the discharge module and the input end of the energy storage module; The circuit switching module is also connected to the controlled end of the second switch and is used to disconnect the second switch when the voltage connected to the load is less than or equal to the rated voltage of the load. The circuit switching module is also used to close the second switch when the voltage connected to the load is greater than the rated voltage of the load.

3. The circuit according to claim 1, characterized in that The discharge module comprises: a first discharge switch, wherein a first end of the first discharge switch is connected to an output end of the rectifier module, and a controlled end of the first discharge switch is connected to the voltage comparison module; A first branch, wherein an input end of the first branch is connected to the second end of the first discharge switch, and an output end of the first branch is connected to the voltage conversion module; a second branch, wherein at least one discharge resistor is disposed on the second branch, an input end of the second branch is connected to the third end of the first discharge switch, an output end of the second branch is connected to the voltage conversion module, and the second branch is used to discharge discharge energy through each of the discharge resistors; The voltage comparison module is used to select and conduct the first end and the second end of the first discharge switch when the received electrical signal is less than or equal to the first discharge threshold; the voltage comparison module is also used to select and conduct the first end and the third end of the first discharge switch when the received electrical signal is greater than the first discharge threshold.

4. The circuit according to claim 3, characterized in that The first discharge threshold is a threshold determined according to a charging safety threshold of the energy storage module and a rated voltage of the load.

5. The circuit according to claim 3, characterized in that The second branch includes: a second discharge switch, a third discharge switch, a first discharge resistor, a second discharge resistor and a third discharge resistor; Wherein, the first end of the second discharge switch is connected to the third end of the first discharge switch, the second end of the second discharge switch is connected to the first end of the third discharge switch via the second discharge resistor, the third end of the second discharge switch is grounded via the first discharge resistor, and the controlled end of the second discharge switch is connected to the voltage comparison module; The second end of the third discharge switch is connected to the voltage conversion module, the third end of the third discharge switch is connected to the voltage conversion module via the third discharge resistor, and the controlled end of the third discharge switch is connected to the voltage comparison module; The voltage comparison module is further used for driving the first and second ends of the second discharge switch and the first and third ends of the third discharge switch to connect when the received electrical signal is greater than the first discharge threshold; The voltage comparison module drives the first end and the second end of the second discharge switch and the first end and the second end of the third discharge switch to connect when the received electrical signal is greater than the second discharge threshold; When the received electrical signal is greater than the third discharge threshold, the voltage comparison module drives the first terminal and the third terminal of the second discharge switch to connect; The first discharge threshold is smaller than the second discharge threshold, and the second discharge threshold is smaller than the third discharge threshold.

6. The circuit according to claim 1, characterized in that Also includes: A protection module is connected in series between the output end of the current transformer and the rectifier module.

7. The circuit according to claim 6, characterized in that The protection module also includes: A third switch connected in series between the current transformer and the load; A protection control circuit, wherein the control end of the protection control circuit is connected to the controlled end of the third switch; the protection control circuit is used to monitor the current signal input to the current transformer, and disconnect the third switch when the current signal is greater than a first safety threshold; the protection module is also used to close the third switch when the current signal is less than or equal to the first safety threshold.

8. The circuit according to claim 6, characterized in that Also includes: a fourth switch, the fourth switch being connected in series between the output end of the circuit switching module and the load; The protection module is also used to connect the load and disconnect the fourth switch when the electrical signal connected to the load is greater than a second safety threshold; the protection module is also used to close the fourth switch when the electrical signal connected to the load is less than or equal to the second safety threshold, and the second safety threshold is greater than the rated voltage of the load.

9. The circuit according to claim 1, characterized in that Also includes: A filter module, wherein the input end of the filter module is connected to the output end of the discharge module, and the output end of the filter module is respectively connected to the voltage comparison module and the voltage conversion module.

10. An electric energy management system, characterized in that: The invention comprises the power management circuit and the load as described in any one of claims 1 to 9.

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