CN219420338U - A wide-voltage AC-DC automatic charging switching circuit - Google Patents

Abstract

The utility model discloses a wide-voltage alternating-current and direct-current automatic charging switching circuit, which comprises an alternating-current charging module used for being connected with alternating-current commercial power, a direct-current charging module used for being connected with direct current and a charging switching module; the charging switching module comprises a relay body connected with the negative electrode of the external equipment to be charged, and a first contact, a second contact and a change-over switch connected with the positive electrode of the external equipment to be charged are arranged on the relay body; the alternating current charging module and the direct current charging module are respectively provided with a positive electrode output interface and a negative electrode output interface. The utility model can support various types of power input to stably charge the outdoor energy storage battery, so that the problem of on-site power taking is solved without carrying back indoor charging, the charging is more convenient, and meanwhile, the charging switching module is arranged to switch direct current charging and alternating current charging so as to adapt to different use requirements, and the compatibility is strong.

Description

A wide-voltage AC-DC automatic charging switching circuit

technical field

The utility model relates to the technical field of power supply charging, in particular to a wide-voltage AC-DC automatic charging switching circuit.

Background technique

Due to various outdoor energy storage power sources, such as mobile power products such as car start-up emergency power supplies, they are generally fully charged on the indoor AC mains, and then taken outdoors for use. The indoor AC mains voltage is relatively stable and the fluctuation is relatively small, while the outdoor power supply is generally AC or DC power provided by generators, vehicle power supplies, wind power, solar energy, etc. Affected by changes in the environment and other factors, the output voltage of the power supply has a relatively large fluctuation range, and the voltage sometimes drops to close to 0V, and sometimes rises to the highest value. The input voltage range of the general charger design is mainly indoors. If it is to be compatible with the power supply provided outdoors, it is necessary to design a charger suitable for wide voltage input in order to charge the outdoor power supply normally.

Utility model content

The purpose of this utility model is to provide a wide-voltage AC-DC automatic charging switching circuit. The circuit is equipped with an AC charging module and a DC charging module. The input voltage range of the AC charging module is between 100-240V, and the input voltage range of the DC charging module is between 9-36V. It can further support various types of power input to charge the outdoor energy storage battery stably, so that it does not need to be brought back to the room for charging, which solves the problem of taking power locally and makes charging more convenient. To adapt to different usage needs, strong compatibility.

In order to achieve the above purpose, the following technical solutions are adopted:

A wide-voltage AC-DC automatic charging switching circuit, including an AC charging module for connecting to AC mains, a DC charging module for connecting to DC, and a charging switching module; the charging switching module includes a relay body connected to the negative pole of an external device to be charged, and the relay body is provided with a first contact, a second contact, and a switch connected to the positive pole of the external device to be charged; the AC charging module and the DC charging module are both provided with a positive output interface and a negative output interface; The positive output interface is connected to the second contact of the relay body, and the negative output interface of the AC charging module and the negative output interface of the DC charging module are both connected to the negative pole of the device to be charged.

Further, the charging switching module further includes a resistor R2 and a diode D5; the resistor R2 is connected between the relay body and the positive output interface of the AC charging module, and the diode D5 is connected between the positive output interface of the AC charging module and the first contact of the relay body.

Further, the charging switching module further includes a diode D1, the cathode of the diode D1 is connected to the positive output interface of the AC charging module, and the anode of the diode D1 is connected to the negative output interface of the AC charging module.

Further, the AC charging module includes an AC input interface, an AC step-down voltage stabilizing circuit, and an AC charging control circuit connected in sequence.

Further, the DC charging module includes a DC input interface, a DC boost voltage stabilizing circuit, and a DC charging control circuit connected in sequence.

Further, the AC charging module and the DC charging module are both connected to a charging indicator light.

Further, the wide voltage input range set by the AC charging module is between 100V and 240V; the wide voltage input range set by the DC charging module is between 9V and 36V.

Further, the AC charging module and the DC charging module are also provided with an adjustable resistor; the AC charging module and the DC charging module can adjust the output voltage between 29-30V through the adjustable resistor.

Adopt such scheme, the beneficial effect of the utility model is:

The circuit is equipped with an AC charging module and a DC charging module. Among them, the input voltage range of the AC charging module is between 100V and 240V, and the input voltage range of the DC charging module is between 9V and 36V, and then it can support various types of power input, so as to charge the outdoor energy storage battery stably, so that it does not need to be brought back to the room for charging, solving the problem of taking power locally and making charging more convenient.

Description of drawings

Fig. 1 is a schematic block diagram of the utility model;

Fig. 2 is one of the embodiments of the utility model, the topological diagram of the 8-cell lithium iron phosphate battery charging circuit;

FIG. 3 is a topological diagram of a charging circuit of a 7-cell ternary lithium battery in one embodiment of the present invention;

Fig. 4 is the circuit diagram of the AC charging module of the present invention;

Fig. 5 is the circuit diagram of the DC charging module of the present invention;

Among them, the accompanying drawings indicate:

1—AC charging module; 2—DC charging module;

3—charging switching module; 4—first contact;

5—second contact; 6—charging indicator light.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in detail.

Referring to Figures 1 to 5, the utility model provides a wide-voltage AC-DC automatic charging switching circuit, including an AC charging module 1 for connecting to AC mains, and a DC charging module 2 for connecting to DC, and also includes a charging switching module 3; the charging switching module 3 includes a relay body connected to the negative pole of the external device to be charged, and the relay body is provided with a first contact 4, a second contact 5, and a switch connected to the positive pole of the external device to be charged; The positive output interface of the charging module 1 is connected to the first contact 4 of the relay body, the positive output interface of the DC charging module 2 is connected to the second contact 5 of the relay body, and the negative output interface of the AC charging module 1 and the negative output interface of the DC charging module 2 are connected to the negative pole of the device to be charged.

Continuing to refer to Figures 1 to 5, in this embodiment, the circuit is provided with an AC charging module 1 and a DC charging module 2, which can input AC mains power and DC power respectively, wherein the wide voltage input range set by the AC charging module 1 is between 100 and 240V, and the wide voltage input range set by the DC charging module 2 is between 9 and 36V; the conventional 24V energy storage battery can be charged normally, because the conventional 24V energy storage power supply generally uses 7 strings of ternary batteries (25.2V) or 8 strings of lithium iron phosphate batteries (25.6V), if large capacity is required, more similar unit battery packs should be connected in parallel; the charging voltage of the 7-series ternary battery pack is normally charged with DC 29.4V (as shown in Figure 3), while the 8-series lithium iron phosphate battery pack is charged with DC 28.8V (as shown in Figure 2).

In one embodiment, the charging switching module 3 further includes a resistor R2, a diode D5, and a diode D1; the resistor R2 is connected between the relay body and the positive output interface of the AC charging module 1, and the diode D5 is connected between the positive output interface of the AC charging module 1 and the first contact 4 of the relay body; the cathode of the diode D1 is connected to the positive output interface of the AC charging module 1, and the anode of the diode D1 is connected to the negative output interface of the AC charging module 1. Since the indoor AC power supply voltage is relatively stable, this circuit uses AC power first. For example, when using DC charging, once the AC power is energized, the relay body will supply power, and the switch will immediately switch to the first contact 4, so that the connected DC power is converted to the charging module of the AC power, so that the charging mode is fast and stable.

In one embodiment, the AC charging module 1 includes an AC input interface, an AC step-down voltage stabilizing circuit, and an AC charging control circuit connected in sequence. As shown in Figure 4, the AC charging module 1 adopts a switching power step-down method, directly rectifies the input AC mains to DC, and then controls the on and off width of the power pulse frequency by the chip, and finally reaches a stable DC charging voltage after filtering (29.4V is selected for the ternary battery pack, and 28.8V is selected for the lithium iron phosphate battery pack). The input mains voltage range has a range width of 140V.

In one embodiment, the DC charging module 2 includes a DC input interface, a DC boost voltage stabilizing circuit, and a DC charging control circuit connected in sequence. As shown in Figure 5, the DC charging module 2 adopts a mature voltage boosting and stabilizing circuit (since the outdoor DC power supply is generally provided by a generator, a car generator or solar energy, its voltage will be affected by environmental factors, and the output voltage will fluctuate, such as when the engine throttle is opened high or low or the load is large or small, the output voltage fluctuates, and the solar power generation is affected by the intensity of sunlight, and the voltage also fluctuates). ) requirements, the battery pack has no way to obtain the electric energy of the external DC power supply, which wastes charging time in vain; the use of a DC boost voltage regulator circuit can raise the low voltage to the charging voltage required by the battery, thereby solving the difficult problem of outdoor charging.

In one embodiment, both the AC charging module 1 and the DC charging module 2 are provided with an adjustable resistor; the AC charging module 1 and the DC charging module 2 can adjust the output voltage between 29-30V through the adjustable resistor.

In one embodiment, the AC charging module 1 and the DC charging module 2 are also connected to a charging indicator light 6, which can be used to indicate which charging method is used.

The above are only preferred embodiments of the utility model, and are not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model shall be included within the protection scope of the utility model.

Claims (8)

1. A wide-voltage AC-DC automatic charging switching circuit, comprising an AC charging module for accessing AC mains power, and a DC charging module for connecting direct current, characterized in that it also includes a charging switching module; the charging switching module includes a relay body connected to the negative pole of the external device to be charged, and the relay body is provided with a first contact, a second contact, and a toggle switch connected to the positive pole of the external device to be charged; the AC charging module and the DC charging module are provided with a positive output interface and a negative output interface; the positive output interface of the AC charging module is connected to the first contact of the relay body The positive output interface of the DC charging module is connected to the second contact of the relay body, and the negative output interface of the AC charging module and the negative output interface of the DC charging module are both connected to the negative pole of the device to be charged. 2. The wide-voltage AC-DC automatic charging switching circuit according to claim 1, wherein the charging switching module further includes a resistor R2 and a diode D5; the resistor R2 is connected between the relay body and the positive output interface of the AC charging module, and the diode D5 is connected between the positive output interface of the AC charging module and the first contact of the relay body. 3. The wide-voltage AC-DC automatic charging switching circuit according to claim 2, wherein the charging switching module further comprises a diode D1, the negative pole of the diode D1 is connected to the positive output interface of the AC charging module, and the positive pole of the diode D1 is connected to the negative output interface of the AC charging module. 4. The wide-voltage AC-DC automatic charging switching circuit according to claim 1, wherein the AC charging module includes an AC input interface, an AC step-down voltage stabilizing circuit, and an AC charging control circuit connected in sequence. 5 . The wide-voltage AC-DC automatic charging switching circuit according to claim 1 , wherein the DC charging module includes a DC input interface, a DC boost voltage regulator circuit, and a DC charging control circuit connected in sequence. 6. The wide-voltage AC-DC automatic charging switching circuit according to claim 1, wherein the AC charging module and the DC charging module are both connected to a charging indicator light. 7. The wide-voltage AC-DC automatic charging switching circuit according to claim 1, wherein the wide-voltage input range set by the AC charging module is between 100-240V; the wide-voltage input range set by the DC charging module is between 9-36V. 8. The wide-voltage AC-DC automatic charging switching circuit according to claim 1, wherein the AC charging module and the DC charging module are both provided with an adjustable resistor; the AC charging module and the DC charging module can be adjusted to output a voltage between 29-30V through the adjustable resistor.