Novel storage battery automatic charging and discharging device

Abstract

The utility model discloses a novel storage battery automatic charging and discharging device, which comprises a battery end, an anti-reverse-flow circuit, a resonant conversion circuit, an auxiliary source circuit, a control circuit and an output circuit, the battery end is respectively connected with the anti-reverse-flow circuit and the auxiliary source circuit, the anti-reverse-flow circuit, the resonant conversion circuit and the output circuit are sequentially connected, and the control circuit is connected with the control circuit. The auxiliary source circuit is connected with the control circuit, the control circuit is connected with the resonant conversion circuit, and the resonant conversion circuit is connected with the auxiliary source circuit. The novel storage battery automatic charging and discharging device provided by the utility model can realize conversion and mutual isolation between direct current and direct current. The system can be widely applied to uninterrupted direct current power supply of control equipment. And the control circuit can control different modes of the resonant conversion circuit according to different external voltages, so that stable control on the charging and discharging states of the storage battery can be realized automatically.

Description

TECHNICAL FIELD

[0001] The utility model relates to power conversion technology field, concretely relates to a novel automatic battery charging and discharging device. BACKGROUND

[0002] The uninterrupted direct current power supply device for controlling equipment on the market mainly carries out discharge and charge to 220V and load by series connection of N batteries, but when one or more than one in series connection system appears abnormal or internal resistance increases, it will cause part of battery energy in series connection system to be not full, the system is in unstable state, causes the system to be unable to realize normal charging and discharging, and influences normal use of the power supply device. UTILITARIAN CONTENT

[0003] The utility model provides a novel automatic battery charging and discharging device, can realize automatic charging and discharging of single battery, makes the power supply device keep stable state.

[0004] The utility model discloses a novel automatic battery charging and discharging device, including battery end, still include: antireflection circuit, resonance conversion circuit, auxiliary source circuit, control circuit and output circuit, the battery end is connected with antireflection circuit and auxiliary source circuit respectively, antireflection circuit, resonance conversion circuit and output circuit are connected in proper order, the auxiliary source circuit is connected with control circuit, control circuit is connected with resonance conversion circuit, resonance conversion circuit is connected with auxiliary source circuit.

[0005] The utility model provides a novel automatic battery charging and discharging device, including battery end, still include: antireflection circuit, resonance conversion circuit, auxiliary source circuit, control circuit and output circuit, the battery end is connected with antireflection circuit and auxiliary source circuit respectively, antireflection circuit, resonance conversion circuit and output circuit are connected in proper order, the auxiliary source circuit is connected with control circuit, control circuit is connected with resonance conversion circuit, resonance conversion circuit is connected with auxiliary source circuit.

[0006] Further, the control circuit includes a discharge control module, and the discharge control module is connected with the resonance conversion circuit.

[0007] Further, the control circuit includes a charging control module, and the charging control module is connected with the resonance conversion circuit.

[0008] Further, the control circuit includes a discharge-to-charge control module, and the discharge-to-charge control module is connected with the resonance conversion circuit.

[0009] Further, the control circuit includes a charge-to-discharge control module, and the charge-to-discharge module is connected with the resonance conversion circuit.

[0010] Further, the utility model also includes a communication module, and the communication module is connected with the control circuit.

[0011] Further, the resonance conversion circuit is a bidirectional LLC resonance conversion topology or a bidirectional CLLC resonance conversion topology.

[0012] Further, the battery end is a lead-acid battery.

[0013] Further, the battery end is a lithium battery.

[0014] Further, the battery end is a sodium battery.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0016] The novel automatic battery charging and discharging device can realize conversion between direct current and direct current and mutual isolation. The control circuit can control different modes of the resonant conversion circuit according to different external voltages, thereby realizing stable control of automatic charging and discharging states of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present application and constitute a part of the application, illustrate embodiments of the present application and do not limit the present application. In the drawings:

[0018] Figure 1 The structure block diagram of the novel automatic battery charging and discharging device is provided.

[0019] Figure 2 The circuit diagram of the bidirectional CLLC converter is provided.

[0020] Figure 3 The ideal waveform schematic diagram of the bidirectional CLLC is provided.

[0021] Figure 4 The mode 1 current path schematic diagram is provided.

[0022] Figure 5 The mode 2 current path schematic diagram is provided.

[0023] Figure 6 The mode 3 current path schematic diagram is provided.

[0024] Figure 7 The mode 4 current path schematic diagram is provided.

[0025] Figure 8 The mode 5 current path schematic diagram is provided.

[0026] Figure 9 The mode 6 current path schematic diagram is provided. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with embodiments and drawings.

[0028] As Figure 1 shown, the utility model provides a novel automatic battery charging and discharging device, including battery end still includes: prevent reverse circuit, resonance conversion circuit, auxiliary source circuit, control circuit and output circuit, battery end is connected with prevent reverse circuit and auxiliary source circuit respectively, prevent reverse circuit, resonance conversion circuit and output circuit connect in proper order, auxiliary source circuit and control circuit are connected, control circuit is connected with resonance conversion circuit, resonance conversion circuit is connected with auxiliary source circuit. Battery end can adopt lead acid, lithium battery or sodium battery. Prevent reverse circuit is used for preventing battery to be reversed. Resonance conversion circuit can adopt bidirectional LLC resonance converter topology or bidirectional CLLC resonance converter topology, is used for realizing the bidirectional flow of electric energy, has the characteristics of high efficiency, high stability. Bidirectional LLC resonance converter topology is constituted by two full bridge inverters and an LLC resonant cavity, bidirectional CLLC resonance converter topology is constituted by two full bridge inverters and an CLLC resonant cavity. Output circuit is mainly used for EMC (electromagnetic compatibility) processing, prevent reverse circuit, soft start circuit and current detection etc. Auxiliary source circuit is used for battery power supply and boost to power supply control circuit and drive power supply etc, 220V is established again after isolation and is reduced to bypass battery voltage boost circuit. Control circuit mainly carries out wave emission to resonance conversion circuit drive, and control circuit controls resonance conversion circuit charging and discharging, according to different external voltage, controls the different charging and discharging state of battery. The novel automatic battery charging and discharging device still includes communication module, and the communication module is connected with the control circuit, and the communication module is used to send the power state of the device to other devices.

[0029] Control circuit includes discharge control module, and the discharge control module is connected with resonance conversion circuit, control circuit includes charging control module, and the charging control module is connected with resonance conversion circuit, control circuit includes discharge conversion charging control module, and the discharge conversion charging control module is connected with resonance conversion circuit, control circuit includes charging conversion discharge control module, and the charging conversion discharge module is connected with resonance conversion circuit. Specifically, when external voltage is less than or equal to 220V, discharge control module sends discharge control signal to resonance conversion circuit, and the novel automatic battery charging and discharging device is in discharging state. When external voltage is greater than or equal to 230V, charging control module sends charging control signal to resonance conversion circuit, and the novel automatic battery charging and discharging device is in charging state. When external voltage switches from 220V to 230V, discharge conversion charging control module sends discharge conversion charging control signal to resonance conversion circuit, and the novel automatic battery charging and discharging device is converted from discharging state to charging state. When external voltage switches from 230V to 225V, charging conversion discharge module sends charging conversion discharge control signal to resonance conversion circuit, and the novel automatic battery charging and discharging device is converted from charging state to discharging state. Resonance conversion circuit controls the flow direction of electric energy of bidirectional CLLC resonance converter according to the control signal of control circuit.

[0030] In this embodiment, the resonant conversion circuit adopts a high-efficiency bidirectional CLLC resonant converter topology as an example. The resonant converter can meet the requirements of boosting discharging the battery, reducing the voltage to the battery voltage and charging the battery, and can also perform friendly charging and discharging management on the battery. As shown in Figure 2 , the primary side is an inverter stage, the secondary side is a rectifier stage, and the middle is a symmetrical high-frequency transformer. It is a completely symmetrical structure, the energy is inverted through the primary side switch, then transmitted to the secondary side through the transformer, and plays the role of electrical isolation, and the secondary side is rectified to generate an output voltage.

[0031] The main parameters are as follows:

[0032] The input voltage V in is the battery voltage, and the output voltage V o is the external DC voltage. L r1 , L r2 is the primary and secondary resonant inductance, which also includes the leakage inductance of the primary and secondary sides. C r1 , C r2 is the resonant capacitance of the primary and secondary sides, and the respective resonant inductance generates a high-frequency resonant frequency. The magnetizing inductance of the transformer is L m . The power flow direction is from left to right for the power supply mode, and the flow direction is positive, and from right to left for the power generation mode, and the flow direction is negative.

[0033] In a single switching cycle, the converter has 6 working modes, modes 1 to 6, of which modes 1, 2, and 3 correspond to a group of switching tubes, and modes 4, 5, and 6 correspond to another group of switching tubes. In addition, modes 1 and 4 are dead zone stages, modes 2 and 5 are resonant and energy transfer stages, and modes 3 and 6 are stages after the end of resonance.

[0034] When the primary side switch transfers energy, the primary side main switch operates in inverter mode, and only the secondary side asynchronous rectification mode, i.e. diode rectification mode, is discussed, so the secondary side mosfet rectifier is closed during rectification.

[0035] Because the circuit is completely symmetrical, only one energy transfer direction, i.e. the power supply mode direction from the primary side to the secondary side, can be analyzed. The circuit principle and efficiency, control strategy are completely consistent when the energy is transferred from the secondary side to the primary side in the charging mode.

[0036] Specifically, mode 1 corresponds to Figure 3 the stage between t a and t b , which is the dead zone state before S i1 and S i2 are turned on. The current path schematic diagram is as shown in Figure 4The shown. Because in the dead time, all switch tubes are not conducting, the original side does not transfer energy to the secondary side, and the original side current only has a reverse magnetizing current, which will affect the S i1 and S i2 output parasitic capacitor discharge, because the input voltage is connected to the two half bridges, the magnetizing current simultaneously charges the S i3 and S i4 output parasitic capacitor, when the magnetizing energy is large enough, the parasitic capacitor is discharged to 0 voltage, and the magnetizing current will flow through the S i1 and S i2 parasitic diode, which creates conditions for the following S i1 and S i2 zero voltage turn-on ZVS (zero voltage switch).

[0037] As Figure 5 shown, mode 2, corresponding Figure 3 to the stage between t b to t c , because the dead zone ends, S i1 and S i2 switches are turned on, and the input voltage is applied to the circuit primary side, so the primary side current i p starts to forcibly convert from negative to positive, and the input end energy is transferred to the output end. Because the transformer sees a low impedance output end V o in this stage, the magnetic energy of L m is linearly established, so it does not participate in the resonance process. As Figure 6 shown, in this stage, the primary side current i p resonates to the peak value and then decreases, and when it decreases to the magnetizing current value, the secondary side current i s becomes 0, and this stage of energy transfer ends. We assume a special case, that is, the converter works at the resonance frequency f r , at which time the resonance ends and enters the next dead zone stage, that is, the switch pulse ends.

[0038] The primary side current i p resonates to the i m magnetizing current, at which time the resonance process stops, and power is no longer transferred from the primary side to the secondary side, so the secondary side current becomes 0 from i s , and the output capacitor cannot be further charged from i s . In this stage, the primary side current i p is equal to i m , and the magnetizing current is maintained until the S i1 and S i2 switches are turned off.

[0039] As Figure 7As shown, mode 4 corresponds to Figure 3 t in d to t e The intermediate phase, which is also a dead zone, is similar to mode 1, before switching to S. i3 and S i4 During switching, however, the charging and discharging of the parasitic capacitance is reversed compared to Mode 1, at which point for S... i3 and S i4 The parasitic capacitance is discharge, for S i1 and S i2 The parasitic capacitance is the charge, and the primary current i p It will flow through S i3 and S i4 The body diode generates the turn-on condition for ZVS.

[0040] like Figure 8 As shown, mode 5 corresponds to Figure 3 t in e to t f The stages between, S i3 and S i4 When the converter is turned on, it begins to transfer energy from the primary side to the secondary side. During this stage, due to the input voltage V... in Added to transformer T r1 The voltage across the primary side is reversed, so the primary current i p It begins to change in the opposite direction. In fact, mode 5 exhibits the same operating characteristics as mode 2, except that the inverter switch is changed from S... i1 and S i2 It became S i3 and S i4 That's all.

[0041] like Figure 9 As shown, mode 6 corresponds to Figure 3 t in f to t g During the transition period, after mode 5, the power transfer from the primary side to the secondary side will stop for a portion of the time, at which point the secondary side current i s The voltage drops to 0 because of this stage, so the body diode S of the secondary rectifier bridge... o3 and S o4 It's also a soft interaction, which can be seen from the i in a typical waveform. o1 and i o3 As can be seen from the current waveform, the body diode current will become 0 after the resonance ends, and there will be no reverse recovery problem.

[0042] The novel automatic battery charging and discharging device can realize conversion and mutual isolation between direct currents, and can be widely applied to uninterrupted direct current power supply of control equipment.

[0043] The above detailed description is only a specific embodiment of the utility model, and is not used to limit the protection scope of the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A novel automatic charging and discharging device for a storage battery, comprising a battery terminal, characterized in that, Also includes: The system includes an anti-reverse circuit, a resonant converter circuit, an auxiliary power source circuit, a control circuit, and an output circuit. The battery terminal is connected to the anti-reverse circuit and the auxiliary power source circuit, respectively. The anti-reverse circuit, the resonant converter circuit, and the output circuit are connected in sequence. The auxiliary power source circuit and the control circuit are connected. The control circuit is connected to the resonant converter circuit, and the resonant converter circuit is connected to the auxiliary power source circuit.

2. The novel automatic charging and discharging device for storage batteries according to claim 1, characterized in that, The control circuit includes a discharge control module, which is connected to the resonant converter circuit.

3. The novel automatic charging and discharging device for storage batteries according to claim 2, characterized in that, The control circuit includes a charging control module, which is connected to the resonant converter circuit.

4. The novel automatic charging and discharging device for storage batteries according to claim 3, characterized in that, The control circuit includes a discharge-to-charge control module, which is connected to the resonant converter circuit.

5. The novel automatic charging and discharging device for a storage battery according to claim 4, characterized in that, The control circuit includes a charge-to-discharge control module, which is connected to the resonant converter circuit.

6. The novel automatic charging and discharging device for storage batteries according to claim 1, characterized in that, It also includes a communication module, which is connected to the control circuit.

7. The novel automatic charging and discharging device for storage batteries according to claim 1, characterized in that, The resonant transformation circuit is a bidirectional LLC resonant transformation topology or a bidirectional CLLC resonant transformation topology.

8. The novel automatic charging and discharging device for storage batteries according to claim 1, characterized in that, The battery terminal is a lead-acid battery.

9. The novel automatic charging and discharging device for storage batteries according to claim 1, characterized in that, The battery terminal is a lithium battery.

10. The novel automatic charging and discharging device for a storage battery according to claim 1, characterized in that, The battery terminal is a sodium battery.

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