Portable energy storage power supply system

Abstract

The invention relates to the technical field of energy storage power supplies, and particularly discloses a portable energy storage power supply system, which comprises an energy storage battery, a BMS (Battery Management System), a first DCDC (Direct Current to Direct Current) circuit and a DCAC (Direct Current to Alternating Current) circuit, the circuit also comprises a second DCDC circuit. The total positive electrode and the total negative electrode of the energy storage battery are connected with the BMS; the output P + of the BMS is connected with the input positive electrode of the first DCDC circuit and the input positive electrode of the second DCDC circuit, and the output P-of the BMS is connected with the input negative electrode of the first DCDC circuit and the input negative electrode of the second DCDC circuit. Output anodes of the first DCDC circuit and the second DCDC circuit are connected to Bus +, and output cathodes of the first DCDC circuit and the second DCDC circuit are connected to Bus-; the input positive electrode of the DCAC circuit is connected with the Bus +, and the input negative electrode circuit of the DCAC circuit is connected with the Bus-. By adopting the technical scheme of the invention, the efficiency of the high-capacity mobile power supply during low-power output can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage power supply, and in particular to a portable energy storage power supply system. Background Art

[0002] Portable energy storage power supply (also called outdoor power supply) is a product that has gradually emerged in recent years. The initial application scenarios are mainly concentrated in short-term outdoor camping, entertainment, and emergency rescue. These scenarios usually require the equipment to have high power and large capacity output, so we pay more attention to how to improve the efficiency of high power output, while the efficiency of low power output is relatively ignored.

[0003] However, with the diversification of product functions and to avoid idle power supplies, surveys have found that more and more users are beginning to use portable energy storage power supplies to power household appliances, such as refrigerators, water dispensers, etc. These appliances usually have low power but long working hours. Therefore, users often choose portable energy storage power supplies with larger capacity (such as products with a capacity of more than 1kWh) to meet the needs of long-term power supply. Although the efficiency of these devices is generally higher than 90% when they are output at high power, when they are working at low power (<100W), the efficiency often drops to 70%-80%, which not only shortens the battery life, but also causes a waste of electricity.

[0004] Therefore, improving efficiency at low power output has become a key issue in extending the battery life of the device. Summary of the invention

[0005] The invention provides a portable energy storage power supply system, which can improve the efficiency of a large-capacity mobile power supply at low power output.

[0006] In order to solve the above technical problems, this application provides the following technical solutions:

[0007] A portable energy storage power supply system includes an energy storage battery, a BMS, a first DCDC circuit and a DCAC circuit; and also includes a second DCDC circuit;

[0008] The total positive and negative electrodes of the energy storage battery are connected to the BMS;

[0009] The output P+ of the BMS is connected to the positive input electrodes of the first DCDC circuit and the second DCDC circuit respectively, and the output P- of the BMS is connected to the negative input electrodes of the first DCDC circuit and the second DCDC circuit respectively;

[0010] The output positive electrodes of the first DCDC circuit and the second DCDC circuit are both connected to Bus+, and the output negative electrodes of the first DCDC circuit and the second DCDC circuit are connected to Bus-;

[0011] The input positive pole of the DCAC circuit is connected to Bus+, and the input negative pole of the DCAC circuit is connected to Bus-.

[0012] The basic scheme principles and beneficial effects are as follows:

[0013] This solution adds a DCDC circuit on the basis of the existing solution. When the output power is small, a low-power DCDC can be selected to work, which will greatly improve the working efficiency, extend the working time, and save electricity. It can effectively solve the efficiency problem of small load and long-term operation under the current development trend of large capacity and high power of mobile power.

[0014] Furthermore, the energy storage battery is a battery pack composed of single cells connected in series, in parallel, or in series and parallel, and the positive and negative electrodes of the single cells are both connected to the BMS.

[0015] Further, the DCAC circuit includes a first DCAC circuit and a second DCAC circuit;

[0016] The output positive electrode of the first DCDC circuit is connected to the input positive electrode of the first DCAC circuit, and the output negative electrode of the first DCDC circuit is connected to the input negative electrode of the first DCAC circuit;

[0017] The output positive electrode of the second DCDC circuit is connected to the input positive electrode of the second DCAC circuit, and the output negative electrode of the second DCDC circuit is connected to the input negative electrode of the second DCAC circuit;

[0018] The positive output electrode of the first DCAC circuit is connected to the positive output electrode of the second DCAC circuit, and the negative output electrode of the first DCAC circuit is connected to the negative output electrode of the second DCAC circuit.

[0019] Further, the first DCDC circuit includes: MOS transistor Q1, MOS transistor Q2, MOS transistor Q3, MOS transistor Q4, MOS transistor Q5, MOS transistor Q6, capacitor C2, capacitor C3, and transformer T1;

[0020] The second DCDC circuit includes: a MOS transistor Q11, a MOS transistor Q12, a transformer T2, a MOS transistor Q13, a MOS transistor Q14, a capacitor C5, and a capacitor C6;

[0021] The DCAC circuit includes: MOS tube Q7, MOS tube Q8, MOS tube Q9, MOS tube Q10, inductor L1, capacitor C4;

[0022] The drain of the MOS tube Q1 is connected to the output P+ of the BMS, the source of the MOS tube Q1 is connected to the drain of the MOS tube Q3, the source of the MOS tube Q3 is connected to the output P- of the BMS, and the source of the MOS tube Q1 is also connected to the upper end of the primary winding of the transformer T1;

[0023] The drain of MOS tube Q2 is connected to the output P+ of BMS, the source of MOS tube Q2 is connected to the drain of MOS tube Q4, the source of MOS tube Q4 is connected to the output P- of BMS, and the drain of MOS tube Q4 is also connected to the lower end of the primary winding of transformer T1;

[0024] The upper end of the secondary winding of the transformer T1 is connected to the source of the MOS transistor Q5, and the source of the MOS transistor Q5 is also connected to the drain of the MOS transistor Q6;

[0025] One end of the capacitor C2 is connected to the drain of the MOS tube Q5, the other end of the capacitor C2 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the source of the MOS tube Q6; the lower end of the secondary winding of the transformer T1 is connected to one end of the capacitor C3;

[0026] The drain of the MOS tube Q11 is connected to the output P+ of the BMS, the source of the MOS tube Q11 is connected to the upper end of the primary winding of the transformer T2, the drain of the MOS tube Q12 is connected to the drain of the MOS tube Q11, the source of the MOS tube Q12 is connected to the lower end of the primary winding of the transformer T2, and the tap of the primary winding of the transformer T2 is connected to the output P- of the BMS;

[0027] The upper end of the secondary winding of the transformer T2 is connected to the source of the MOS transistor Q13, and the source of the MOS transistor Q13 is also connected to the drain of the MOS transistor Q14;

[0028] One end of the capacitor C5 is connected to the drain of the MOS tube Q13, the other end of the capacitor C5 is connected to one end of the capacitor C6, and the other end of the capacitor C6 is connected to the source of the MOS tube Q14; the lower end of the secondary winding of the transformer T2 is connected to one end of the capacitor C6;

[0029] The drain of the MOS tube Q13 is connected to the drain of the MOS tube Q5, and the source of the MOS tube Q14 is connected to the source of Q6;

[0030] The drain of the MOS transistor Q7 is connected to one end of the capacitor C2, the source of the MOS transistor Q7 is connected to the drain of the MOS transistor Q9, and the source of the MOS transistor Q9 is connected to the other end of the capacitor C3; the drain of the MOS transistor Q8 is connected to one end of the capacitor C2, the source of the MOS transistor Q8 is connected to the drain of the MOS transistor Q10, and the source of the MOS transistor Q10 is connected to the other end of the capacitor C3;

[0031] One end of the inductor L1 is connected to the source of the MOS transistor Q7, the other end of the inductor L1 is connected to one end of the capacitor C4, the other end of the capacitor C4 is connected to the drain of the MOS transistor Q10; both ends of the capacitor C4 are also connected to the load respectively;

[0032] It also includes a capacitor C1, and two ends of the capacitor C1 are respectively connected to the output P+ and the output P- of the BMS.

[0033] Furthermore, the first DCDC circuit is a bidirectional DCDC circuit; the second DCDC circuit is a bidirectional DCDC circuit or a unidirectional DCDC circuit.

[0034] Furthermore, the MOS transistor Q13 and the MOS transistor Q14 are replaced by diodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A logic block diagram of a first embodiment of a portable energy storage power supply system;

[0036] Figure 2 A circuit diagram of a portable energy storage power supply system embodiment 1;

[0037] Figure 3 The present invention is a logic block diagram of a second embodiment of a portable energy storage power supply system. DETAILED DESCRIPTION

[0038] The following is further described in detail through specific implementation methods:

[0039] Embodiment 1

[0040] like Figure 1 As shown, a portable energy storage power supply system of this embodiment includes an energy storage battery, a BMS (Battery Management System), a first DCDC circuit, a second DCDC circuit, and a DCAC circuit;

[0041] The energy storage battery is a battery pack composed of single cells connected in series, in parallel or in series and parallel, and the total positive and negative electrodes of the battery pack are connected to the BMS;

[0042] The positive and negative electrodes of the single battery are connected to the BMS;

[0043] The first DCDC circuit is a bidirectional DCDC circuit; the second DCDC circuit is a bidirectional DCDC circuit or a unidirectional DCDC circuit. Compared with the unidirectional DCDC circuit, the bidirectional DCDC circuit has a higher cost but more functions.

[0044] The output P+ of the BMS is connected to the positive input electrodes of the first DCDC circuit and the second DCDC circuit respectively, and the output P- of the BMS is connected to the negative input electrodes of the first DCDC circuit and the second DCDC circuit respectively;

[0045] The output positive electrodes of the first DCDC circuit and the second DCDC circuit are both connected to Bus+, and the output negative electrodes of the first DCDC circuit and the second DCDC circuit are connected to Bus-;

[0046] The input positive pole of the DCAC circuit is connected to Bus+, and the input negative pole of the DCAC circuit is connected to Bus-.

[0047] Take a portable power bank with a capacity of 1kWh as an example:

[0048] When discharge is required, the first DCDC circuit is started first. When the output power is detected to be less than 200W (about 20% load) and the duration is greater than the set threshold, the second DCDC circuit is started and the first DCDC circuit is turned off.

[0049] When the second DCDC circuit is operating and it is detected that the load increases and is greater than 200W, the first DCDC circuit starts to operate and the second DCDC circuit is turned off;

[0050] When the first DCDC is running, if it is detected that the load is greater than the rated output power of the first DCDC circuit, the second DCDC circuit is started. At this time, the two DCDCs can run at the same time (of course, they can also run at different times, and the control logic can be flexibly set according to the actual situation);

[0051] like Figure 2 As shown, specifically,

[0052] The first DCDC circuit includes: MOS transistor Q1, MOS transistor Q2, MOS transistor Q3, MOS transistor Q4, MOS transistor Q5, MOS transistor Q6, capacitor C2, capacitor C3, and transformer T1;

[0053] The second DCDC circuit includes: a MOS transistor Q11, a MOS transistor Q12, a transformer T2, a MOS transistor Q13, a MOS transistor Q14, a capacitor C5, and a capacitor C6;

[0054] The DCAC circuit includes: MOS tube Q7, MOS tube Q8, MOS tube Q9, MOS tube Q10, inductor L1, capacitor C4;

[0055] The drain of the MOS tube Q1 is connected to the output P+ of the BMS, the source of the MOS tube Q1 is connected to the drain of the MOS tube Q3, the source of the MOS tube Q3 is connected to the output P- of the BMS, and the source of the MOS tube Q1 is also connected to the upper end of the primary winding of the transformer T1;

[0056] The drain of MOS tube Q2 is connected to the output P+ of BMS, the source of MOS tube Q2 is connected to the drain of MOS tube Q4, the source of MOS tube Q4 is connected to the output P- of BMS, and the drain of MOS tube Q4 is also connected to the lower end of the primary winding of transformer T1;

[0057] The upper end of the secondary winding of the transformer T1 is connected to the source of the MOS transistor Q5, and the source of the MOS transistor Q5 is also connected to the drain of the MOS transistor Q6;

[0058] One end of capacitor C2 is connected to the drain of MOS tube Q5, the other end of capacitor C2 is connected to one end of capacitor C3, the other end of capacitor C3 is connected to the source of MOS tube Q6; the lower end of the secondary winding of transformer T1 is connected to one end of capacitor C3.

[0059] The drain of the MOS tube Q11 is connected to the output P+ of the BMS, the source of the MOS tube Q11 is connected to the upper end of the primary winding of the transformer T2, the drain of the MOS tube Q12 is connected to the drain of the MOS tube Q11, the source of the MOS tube Q12 is connected to the lower end of the primary winding of the transformer T2, and the tap of the primary winding of the transformer T2 is connected to the output P- of the BMS;

[0060] The upper end of the secondary winding of the transformer T2 is connected to the source of the MOS transistor Q13, and the source of the MOS transistor Q13 is also connected to the drain of the MOS transistor Q14;

[0061] One end of the capacitor C5 is connected to the drain of the MOS tube Q13, the other end of the capacitor C5 is connected to one end of the capacitor C6, and the other end of the capacitor C6 is connected to the source of the MOS tube Q14; the lower end of the secondary winding of the transformer T2 is connected to one end of the capacitor C6;

[0062] The drain of the MOS tube Q13 is connected to the drain of the MOS tube Q5, and the source of the MOS tube Q14 is connected to the source of Q6;

[0063] The drain of the MOS transistor Q7 is connected to one end of the capacitor C2, the source of the MOS transistor Q7 is connected to the drain of the MOS transistor Q9, and the source of the MOS transistor Q9 is connected to the other end of the capacitor C3; the drain of the MOS transistor Q8 is connected to one end of the capacitor C2, the source of the MOS transistor Q8 is connected to the drain of the MOS transistor Q10, and the source of the MOS transistor Q10 is connected to the other end of the capacitor C3;

[0064] One end of the inductor L1 is connected to the source of the MOS transistor Q7, the other end of the inductor L1 is connected to one end of the capacitor C4, the other end of the capacitor C4 is connected to the drain of the MOS transistor Q10; both ends of the capacitor C4 are also connected to the load respectively;

[0065] It also includes a capacitor C1, and two ends of the capacitor C1 are respectively connected to the output P+ and the output P- of the BMS.

[0066] In other embodiments, the MOS transistor Q13 and the MOS transistor Q14 may be replaced by diodes.

[0067] When discharge is required, the first DCDC circuit is started first. The working principle of the first DCDC circuit is as follows:

[0068] In one cycle, first, MOS tube Q1, MOS tube Q2, MOS tube Q5 are closed at the same time, and then MOS tube Q1, MOS tube Q2, MOS tube Q5 are disconnected; then MOS tube Q2, MOS tube Q3, MOS tube Q6 are closed at the same time, and finally MOS tube Q2, MOS tube Q3, MOS tube Q6 are disconnected, and the cycle is repeated to achieve the boost function; when it is detected that the output power is continuously less than 200W and the duration is greater than the set threshold, the second DCDC circuit is started first, and then the first DCDC circuit is turned off;

[0069] The working principle of the second DCDC circuit is as follows:

[0070] In one cycle, the MOS transistor Q11 and the MOS transistor Q13 are closed at the same time, then the MOS transistor Q11 and the MOS transistor Q13 are opened, then the MOS transistor Q12 and the MOS transistor Q14 are closed at the same time, and finally the MOS transistor Q12 and the MOS transistor Q14 are opened at the same time, and the boost function can be realized by such a cycle.

[0071] MOS tube Q7, MOS tube Q8, MOS tube Q9, MOS tube Q10, inductor L1, and capacitor C4 form an inverter circuit, and the working principle is as follows:

[0072] When the MOS tube Q7 and the MOS tube Q10 are closed at the same time, a forward voltage can be output, and the output voltage can be adjusted to a sine wave output by controlling the switching frequency and the duty cycle; when the MOS tube Q8 and the MOS tube Q9 are closed at the same time, a reverse voltage can be output, and the output voltage can be adjusted to a sine wave output by controlling the switching frequency and the duty cycle.

[0073] Inductor L1 and capacitor C4 form a filter circuit.

[0074] Conventional mobile power supplies may need to design two or more DCDC step-down circuits according to different functional requirements, for example, one for 12V output and one for 5V output, but will not design two DCDC boost circuits for boost function. In this solution, two DCDC boost circuits are designed. When the output power is small, the low-power DCDC circuit is selected to work, which will greatly improve the working efficiency, extend the working time, and save electricity bills.

[0075] Embodiment 2

[0076] The difference between this embodiment and the first embodiment is that the DCAC circuit includes a first DCAC circuit and a second DCAC circuit.

[0077] The output positive electrode of the first DCDC circuit is connected to the input positive electrode of the first DCAC circuit, and the output negative electrode of the first DCDC circuit is connected to the input negative electrode of the first DCAC circuit;

[0078] The output positive electrode of the second DCDC circuit is connected to the input positive electrode of the second DCAC circuit, and the output negative electrode of the second DCDC circuit is connected to the input negative electrode of the second DCAC circuit;

[0079] The positive output electrode of the first DCAC circuit and the positive output electrode of the second DCAC circuit are connected through a switch, and the negative output electrode of the first DCAC circuit and the negative output electrode of the second DCAC circuit are connected through a switch.

[0080] In this embodiment, the switch may be a circuit breaker, a relay, a MOSFET, or a knob switch.

[0081] The advantages of using two-way DCAC circuit are as follows:

[0082] 1. When the switch is turned off, the two DCAC can output independently without affecting each other;

[0083] 2. When the switch is closed, the two DCACs work simultaneously, increasing the output power.

[0084] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field to which the invention belongs before the application date or the priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A portable energy storage power supply system, comprising an energy storage battery, a BMS, a first DCDC circuit and a DCAC circuit; characterized in that: Also comprising a second DCDC circuit; The total positive and negative electrodes of the energy storage battery are connected to the BMS; The output P+ of the BMS is connected to the positive input electrodes of the first DCDC circuit and the second DCDC circuit respectively, and the output P- of the BMS is connected to the negative input electrodes of the first DCDC circuit and the second DCDC circuit respectively; The output positive electrodes of the first DCDC circuit and the second DCDC circuit are both connected to Bus+, and the output negative electrodes of the first DCDC circuit and the second DCDC circuit are connected to Bus-; The input positive pole of the DCAC circuit is connected to Bus+, and the input negative pole of the DCAC circuit is connected to Bus-.

2. The portable energy storage power supply system according to claim 1, characterized in that: The energy storage battery is a battery pack composed of single cells connected in series, in parallel, or in series and parallel, and the positive and negative electrodes of the single cells are both connected to the BMS.

3. The portable energy storage power supply system according to claim 1, characterized in that: The DCAC circuit includes a first DCAC circuit and a second DCAC circuit; The output positive electrode of the first DCDC circuit is connected to the input positive electrode of the first DCAC circuit, and the output negative electrode of the first DCDC circuit is connected to the input negative electrode of the first DCAC circuit; The output positive electrode of the second DCDC circuit is connected to the input positive electrode of the second DCAC circuit, and the output negative electrode of the second DCDC circuit is connected to the input negative electrode of the second DCAC circuit; The positive output electrode of the first DCAC circuit is connected to the positive output electrode of the second DCAC circuit, and the negative output electrode of the first DCAC circuit is connected to the negative output electrode of the second DCAC circuit.

4. The portable energy storage power supply system according to claim 1, characterized in that: The first DCDC circuit includes: MOS transistor Q1, MOS transistor Q2, MOS transistor Q3, MOS transistor Q4, MOS transistor Q5, MOS transistor Q6, capacitor C2, capacitor C3, and transformer T1; The second DCDC circuit includes: a MOS transistor Q11, a MOS transistor Q12, a transformer T2, a MOS transistor Q13, a MOS transistor Q14, a capacitor C5, and a capacitor C6; The DCAC circuit includes: MOS tube Q7, MOS tube Q8, MOS tube Q9, MOS tube Q10, inductor L1, capacitor C4; The drain of the MOS tube Q1 is connected to the output P+ of the BMS, the source of the MOS tube Q1 is connected to the drain of the MOS tube Q3, the source of the MOS tube Q3 is connected to the output P- of the BMS, and the source of the MOS tube Q1 is also connected to the upper end of the primary winding of the transformer T1; The drain of MOS tube Q2 is connected to the output P+ of BMS, the source of MOS tube Q2 is connected to the drain of MOS tube Q4, the source of MOS tube Q4 is connected to the output P- of BMS, and the drain of MOS tube Q4 is also connected to the lower end of the primary winding of transformer T1; The upper end of the secondary winding of the transformer T1 is connected to the source of the MOS transistor Q5, and the source of the MOS transistor Q5 is also connected to the drain of the MOS transistor Q6; One end of the capacitor C2 is connected to the drain of the MOS tube Q5, the other end of the capacitor C2 is connected to one end of the capacitor C3, and the other end of the capacitor C3 is connected to the source of the MOS tube Q6; the lower end of the secondary winding of the transformer T1 is connected to one end of the capacitor C3; The drain of the MOS tube Q11 is connected to the output P+ of the BMS, the source of the MOS tube Q11 is connected to the upper end of the primary winding of the transformer T2, the drain of the MOS tube Q12 is connected to the drain of the MOS tube Q11, the source of the MOS tube Q12 is connected to the lower end of the primary winding of the transformer T2, and the tap of the primary winding of the transformer T2 is connected to the output P- of the BMS; The upper end of the secondary winding of the transformer T2 is connected to the source of the MOS transistor Q13, and the source of the MOS transistor Q13 is also connected to the drain of the MOS transistor Q14; One end of the capacitor C5 is connected to the drain of the MOS tube Q13, the other end of the capacitor C5 is connected to one end of the capacitor C6, and the other end of the capacitor C6 is connected to the source of the MOS tube Q14; the lower end of the secondary winding of the transformer T2 is connected to one end of the capacitor C6; The drain of the MOS tube Q13 is connected to the drain of the MOS tube Q5, and the source of the MOS tube Q14 is connected to the source of the MOS tube Q6; The drain of the MOS transistor Q7 is connected to one end of the capacitor C2, the source of the MOS transistor Q7 is connected to the drain of the MOS transistor Q9, and the source of the MOS transistor Q9 is connected to the other end of the capacitor C3; the drain of the MOS transistor Q8 is connected to one end of the capacitor C2, the source of the MOS transistor Q8 is connected to the drain of the MOS transistor Q10, and the source of the MOS transistor Q10 is connected to the other end of the capacitor C3; One end of the inductor L1 is connected to the source of the MOS transistor Q7, the other end of the inductor L1 is connected to one end of the capacitor C4, the other end of the capacitor C4 is connected to the drain of the MOS transistor Q10; both ends of the capacitor C4 are also connected to the load respectively; It also includes a capacitor C1, and two ends of the capacitor C1 are respectively connected to the output P+ and the output P- of the BMS.

5. The portable energy storage power supply system according to claim 1, characterized in that: The first DCDC circuit is a bidirectional DCDC circuit; the second DCDC circuit is a bidirectional DCDC circuit or a unidirectional DCDC circuit.

6. The portable energy storage power supply system according to claim 4, characterized in that: The MOS transistor Q13 and the MOS transistor Q14 are replaced by diodes.

Images