Storage battery charging module capable of being integrated in power supply

Abstract

The utility model provides a storage battery charging module capable of being integrated in a power supply, which is characterized in that an induction heating power supply direct current bus anode is connected to the input end of a first storage battery floating charging plate through a second fuse and a storage battery charging plate input end current-limiting resistor; the direct-current bus cathode of the induction heating power supply is connected to the input end of the second storage battery floating charge panel through the first fuse; a direct-current bus power supply of the induction heating power supply is connected to the storage battery floating charge panels, the output end of the first storage battery floating charge panel is connected to the circuit breaker through the storage battery charge panel output end current-limiting resistor and then connected to the positive electrode of the reverse cut-off diode and the positive electrode of the storage battery pack, and the negative electrode of the storage battery is connected with the negative electrode of a direct-current bus of the induction heating power supply. The output end of the second storage battery floating charging board is connected to the circuit breaker and then connected to the negative electrode of the direct current bus of the induction heating power supply. The storage battery charging module is small and economical by directly taking the direct current of the induction heating power supply.

Description

Technical Field

[0001] The utility model relates to the technical field of high-power battery fast charging, in particular to a battery charging module which can be integrated in a power source. Background Art

[0002] The mains power grid is affected by circuit transformation and overload failure of other load equipment, resulting in long-term power outages. For high-power induction heating power supplies, they generally have a main circuit power grid power failure and undervoltage protection function. After the main power circuit is powered off, the induction heating power supply will stop working directly. If there is no backup power supply unit, it will directly lead to forced suspension of production midway, scrapping of products, and reduced production efficiency.

[0003] Therefore, for applications with relatively high requirements, it is necessary to equip a spare large-capacity high-voltage battery energy storage unit to serve as a backup energy storage unit for high-power induction heating power supply equipment. In the event of a power outage in the mains, the battery will play a role in ensuring that the high-power induction heating power supply continues to work normally. Therefore, when the mains energy is supplied normally, in order to ensure that the battery is always fully charged, a charging device is required to quickly charge the battery to ensure emergency needs.

[0004] Traditional independent charging equipment and induction heating equipment do not form a chain intelligent mechanism, and the battery often misses charging. In addition, the traditional charging device has a complex rectification, filtering, inversion and rectification circuit, so the internal structure of the traditional charging device is complex and large in size, and part of the main circuit of the traditional charging device is repeated with the main circuit of the induction heating device, so the manufacturing cost, maintenance cost and failure rate of the traditional independent charging device are very high. Utility Model Content

[0005] The purpose of the utility model is to integrate a high-efficiency battery charging module unit inside an induction heating power supply device to ensure that as long as the induction heating power supply device is in a standby state, the standby battery unit is always in a fully charged state.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is to provide a battery charging module that can be integrated in a power supply, which is arranged in the main circuit after rectification of the induction heating power supply and is used to charge the backup battery of the induction heating power supply;

[0007] The battery charging module comprises:

[0008] The positive pole DC+ of the induction heating power supply DC bus is connected to the first battery floating charging board input terminal VPIN+ through the second fuse FU2 and the current limiting resistor R1 at the input terminal of the battery charging board, and the negative pole DC- of the induction heating power supply DC bus is connected to the second battery floating charging board input terminal VPIN- through the first fuse FU1;

[0009] The DC bus power supply of the induction heating power supply is connected to the battery floating charging board. The output terminal VPO+ of the first battery floating charging board is connected to the circuit breaker QF through the current limiting resistor R4 at the output end of the battery charging board, and then connected to the positive electrode of the reverse current blocking diode D3 and the positive electrode of the battery pack. The negative electrode of the battery is connected to the negative electrode DC- of the DC bus of the induction heating power supply. The negative electrode of the reverse current blocking diode D3 is connected to the positive electrode DC+ of the DC bus of the induction heating power supply. The output terminal VOP- of the second battery floating charging board is connected to the circuit breaker QF, and then connected to the negative electrode DC- of the DC bus of the induction heating power supply.

[0010] Preferably, the positive pole DC+ of the induction heating power supply DC bus and the negative pole DC- of the induction heating power supply DC bus are both the DC parts of the induction heating power supply main circuit.

[0011] Preferably, the first battery charging board input terminal VPIN+ is connected to the positive electrode of the battery charging board reverse cutoff diode D1, and the negative electrode of the battery charging board reverse cutoff diode D1 is connected to one end of the first filter capacitor C1, the second filter capacitor C2, and the third filter capacitor C3;

[0012] The cathode of the reverse intercepting diode D1 of the battery charging board is connected to the source of the SiCMOS tube Q1, the drain of the SiCMOS tube Q1 is connected to the cathode of the freewheeling diode D2 of the first charging board and one end of the inductor L1, and the other end of the inductor L1 is connected to one electrode of the filter capacitor C4, the output terminal VPO+ of the first battery charging board, the output voltage feedback and the high-voltage cut-off circuit;

[0013] The second battery charging board input terminal VPIN- is connected to the other ends of the first filter capacitor C1, the second filter capacitor C2, and the third filter capacitor C3, and is connected to the positive electrode of the freewheeling diode D2, the other electrode of the filter capacitor C4, one electrode of the output current collection resistor R2, and one electrode of the output current feedback and short-circuit protection circuit. The other electrode of the output current collection resistor R2 is connected to the second battery charging board output terminal VPO-, and is connected to one electrode of the output current feedback and short-circuit protection circuit and one electrode of the output voltage and output current control circuit;

[0014] The voltage signal of resistor R2 is output as an output current signal through the output current feedback and short-circuit protection circuit, and is transmitted to the output voltage and output current control circuit. The voltage between the output terminals VPO+ and VPO- of the battery charging board is processed into a limiting and protection signal through the output voltage feedback and high-voltage cut-off circuit, and is transmitted to the output voltage and output current control circuit. The output voltage and output current control circuit then outputs a control signal to the chopping PWM pulse circuit. The chopping PWM pulse circuit outputs a PWM pulse signal to one end of the gate drive current limiting resistor R3, and the other end of the gate drive current limiting resistor R3 is connected to the gate of the SiCMOS tube Q1.

[0015] The technical solution of the utility model proposes a battery charging module that can be integrated into a power supply, and the battery charging module is integrated into the induction heating power supply, skipping a separate circuit breaker and a rectifier, and directly taking the 550V DC voltage of the induction heating power supply as the input energy of the charging module, so as to make the battery charging module miniaturized and economical. The battery charging module also has a charging current control circuit. When the battery energy is lower than a preset value, the charging module charges the battery with a large current and quickly, and at the same time limits the maximum charging current to avoid affecting the life of the battery. When the battery energy is gradually filled, the charging current of the charging module automatically slows down, and PID automatically adjusts the charging speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 An integrated control circuit diagram provided for an embodiment of the utility model;

[0017] Figure 2 A gate pulse chopping circuit diagram provided for an embodiment of the utility model;

[0018] Figure 3 A schematic diagram of a high-current PCB board provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0020] The utility model embodiment proposes a battery charging module that can be integrated in a power supply, which is arranged in the main circuit after rectification of the induction heating power supply, and is used to charge the backup battery of the induction heating power supply. The module includes an output current feedback and short-circuit protection circuit, an output voltage feedback and high-voltage cut-off control circuit, an output voltage and output current control circuit, a chopping PWM pulse output circuit, and a high-current high-voltage PCB integrated circuit board, wherein:

[0021] The 24VDC power supply of the battery float charging circuit is directly taken from the power supply of the induction heating equipment. The DC input and output of the battery charging module and the battery DC main output are all connected to the 550VDC DC circuit of the induction heating power supply.

[0022] Specifically, if Figure 1 As shown, the positive pole DC+ of the induction heating power supply DC bus is connected to the input terminal VPIN+ of the battery floating charging board through the second fuse FU2 and the current limiting resistor R1 at the input terminal of the battery charging board, and the negative pole DC- of the induction heating power supply DC bus is connected to the input terminal VPIN- of the battery floating charging board through the first fuse FU1. The positive pole DC+ of the induction heating power supply DC bus and the negative pole DC- of the induction heating power supply DC bus are both the DC parts of the main circuit of the induction heating power supply.

[0023] The 24VDC control power supply of the induction heating power supply is connected to the 24V+ and 24V- of the battery floating charging board. The output terminal VPO+ of the battery floating charging board is connected to the circuit breaker QF through the current limiting resistor R4 at the output end of the battery charging board, and then connected to the positive electrode of the reverse current blocking diode D3 and the positive electrode of the battery pack. The negative electrode of the battery is directly connected to the negative electrode DC- of the DC bus of the induction heating power supply. The negative electrode of the reverse current blocking diode D2 is directly connected to the positive electrode DC+ of the DC bus of the induction heating power supply. The output terminal VPO- of the battery floating charging board is connected to the circuit breaker QF and then connected to the negative electrode DC- of the DC bus of the induction heating power supply.

[0024] After full-bridge rectification, the induction heating power source converts the three-phase 380VAC AC power into 550VDC DC power. The main DC bus of the induction heating power source is directly connected to the high-voltage DC input interface of the battery charging module. The pulse chopping control circuit is loaded on the positive pole behind the input port, and the chopping circuit is connected to the chopping PWM pulse output circuit. At the same time, the output current feedback and short-circuit protection circuit collects the output voltage of the battery charging board by collecting the output current, output voltage feedback and high-voltage cut-off circuit of the battery charging board, and transmits the current feedback and short-circuit protection signal, output voltage feedback and high-voltage cut-off signal to the output voltage and output current control circuit. The output voltage and output current control circuit performs PID calculation and outputs the signal to the chopping PWM pulse output circuit, thereby controlling the output current and output voltage of the battery charging board, and providing output current limitation and output voltage high-voltage cut-off protection. During protection, the input signal of the chopping PWM pulse output circuit is disconnected, and the output of the SICMOS tube Q1 is cut off.

[0025] Specifically, if Figure 2 As shown, the input terminal VPIN+ of the battery charging board is connected to the positive electrode of the reverse current intercepting diode D1 of the battery charging board, and the negative electrode of the reverse current intercepting diode D1 of the battery charging board is connected to one end of the first filter capacitor C1, the second filter capacitor C2, and the third filter capacitor C3;

[0026] The negative electrode of the reverse intercepting diode D1 of the battery charging board is connected to the source electrode of the SiCMOS tube Q1, the drain electrode of the SiCMOS tube Q1 is connected to the negative electrode of the freewheeling diode D2 of the first charging board and one end of the inductor L1, and the other end of the inductor L1 is connected to one electrode of the filter capacitor C4, the positive electrode VPO+ of the output terminal of the battery charging board, the output voltage feedback and the high-voltage cut-off circuit. The DC input terminal VPIN- of the battery charging board is connected to the other end of the first filter capacitor C1, the second filter capacitor C2, and the third filter capacitor C3, and is connected to the positive electrode of the freewheeling diode D2, the other electrode of the filter capacitor C4, one electrode of the output current collection resistor R2, and one electrode of the output current feedback and short-circuit protection circuit. The other electrode of the output current collection resistor R2 is directly connected to the output terminal VPO- of the battery charging board, and is connected to one electrode of the output current feedback and short-circuit protection circuit and one electrode of the output voltage and output current control circuit; the output current feedback and short-circuit protection circuit collects the The voltage signal of the resistor R2 is converted into an output current signal and transmitted to the output voltage and output current control circuit. The output voltage feedback and high-voltage cut-off circuit collects the voltage between the output terminals VPO+ and VPO- of the battery charging board and processes it into a limiting and protection signal and transmits it to the output voltage and output current control circuit. The output voltage and output current control circuit then outputs the control signal to the chopping PWM pulse circuit. The chopping PWM pulse circuit outputs a PWM pulse signal connected to one end of the gate drive current limiting resistor R3, and the other end of the gate drive current limiting resistor R3 is connected to the gate of the SiCMOS tube Q1.

[0027] like Figure 3 As shown, the above components and the entire control circuit are integrated on a PCB circuit board, which shortens the line length and makes the layout neat. At the same time, the use of a multilayer board can weaken the electromagnetic interference on the line, reduce damage and reduce the size of the charging device.

[0028] Traditional charging devices are equipped with separate cabinets, and the main circuit has built-in three-phase circuit breakers, rectifiers, filters and display screens. The battery charging module that can be integrated into the power supply provided by the utility model is different from the conventional charging device structure. The battery charging module is integrated into the induction heating power supply, skipping the separate circuit breaker and rectifier, and directly taking the 550V DC power of the induction heating power supply as the input energy of the charging module. In this way, the use of the battery charging module is miniaturized and economical. In addition, all charging parameters are integrated into the induction heating power supply equipment, and the display interface is shared with the induction heating equipment, which is more cost-saving and easy to manage.

[0029] The battery charging module also has a charging current control circuit. When the battery energy is less than 50%, the charging module charges the battery quickly with a large current, while limiting the maximum charging current to avoid affecting the battery life. When the battery energy is gradually full, the charging current of the charging module automatically slows down, and PID automatically adjusts the charging speed. At the same time, the battery charging module has a reverse input voltage cutoff control circuit. When the 380VAC loop voltage of the load (for example: induction heating power supply) is normal, the battery does not output power to the load. Only when the 380VAC loop voltage of the main circuit is reduced by a certain value, lower than the voltage of the battery, the charging module will allow the battery to output energy to the induction heating power supply.

[0030] The utility model provides a battery charging module that can be integrated in a power supply and has an integrated PCB board design for carrying large currents. A large-area copper substrate is laid on the PCB circuit board, and a maximum DC current of 8A can be carried. All circuits adopt a multi-layer board design, which can reduce signal interference.

Claims

1. A battery charging module that can be integrated into a power supply, characterized in that: It is installed in the main circuit after rectification of the induction heating power supply and is used to charge the backup battery of the induction heating power supply; The battery charging module comprises: The positive pole DC+ of the induction heating power supply DC bus is connected to the first battery floating charging board input terminal VPIN+ through the second fuse FU2 and the current limiting resistor R1 at the input terminal of the battery charging board, and the negative pole DC- of the induction heating power supply DC bus is connected to the second battery floating charging board input terminal VPIN- through the first fuse FU1; The DC bus power supply of the induction heating power supply is connected to the battery floating charging board. The output terminal VPO+ of the first battery floating charging board is connected to the circuit breaker QF through the current limiting resistor R4 at the output end of the battery charging board, and then connected to the positive electrode of the reverse current blocking diode D3 and the positive electrode of the battery pack. The negative electrode of the battery is connected to the negative electrode DC- of the DC bus of the induction heating power supply, and the negative electrode of the reverse current blocking diode D3 is connected to the positive electrode DC+ of the DC bus of the induction heating power supply. The output terminal VPO- of the second battery floating charging board is connected to the circuit breaker QF, and then connected to the negative electrode DC- of the DC bus of the induction heating power supply.

2. A battery charging module that can be integrated into a power supply as claimed in claim 1, characterized in that: The positive pole DC+ of the induction heating power supply DC bus and the negative pole DC- of the induction heating power supply DC bus are both the DC parts of the main circuit of the induction heating power supply.

3. A battery charging module that can be integrated into a power supply as claimed in claim 1, characterized in that: The first battery floating charging board input terminal VPIN+ is connected to the positive electrode of the battery charging board reverse current intercepting diode D1, and the negative electrode of the battery charging board reverse current intercepting diode D1 is connected to one end of the first filter capacitor C1, the second filter capacitor C2, and the third filter capacitor C3; The cathode of the reverse intercepting diode D1 of the battery charging board is connected to the source of the SiCMOS tube Q1, the drain of the SiCMOS tube Q1 is connected to the cathode of the freewheeling diode D2 of the first charging board and one end of the inductor L1, and the other end of the inductor L1 is connected to one electrode of the filter capacitor C4, the positive output terminal VPO+ of the first battery charging board, the output voltage feedback and the high-voltage cut-off circuit; The output terminal VPIN- of the second battery charging board is connected to the other ends of the first filter capacitor C1, the second filter capacitor C2, and the third filter capacitor C3, and is connected to the positive electrode of the freewheeling diode D2, the other electrode of the filter capacitor C4, one electrode of the output current collection resistor R2, and one electrode of the output current feedback and short-circuit protection circuit. The other electrode of the output current collection resistor R2 is connected to the output terminal VPO- of the second battery charging board, and is connected to one electrode of the output current feedback and short-circuit protection circuit and one electrode of the output voltage and output current control circuit; The voltage signal of resistor R2 is output as an output current signal through the output current feedback and short-circuit protection circuit, and is transmitted to the output voltage and output current control circuit. The voltage between the output terminals VPO+ and VPO- of the battery charging board is processed into a limiting and protection signal through the output voltage feedback and high-voltage cut-off circuit, and is transmitted to the output voltage and output current control circuit. The output voltage and output current control circuit then outputs a control signal to the chopping PWM pulse circuit. The chopping PWM pulse circuit outputs a PWM pulse signal to one end of the gate drive current limiting resistor R3, and the other end of the gate drive current limiting resistor R3 is connected to the gate of the SiCMOS tube Q1.

Images