CN203104069U

CN203104069U - Constant-voltage charging circuit

Info

Publication number: CN203104069U
Application number: CN 201320096494
Authority: CN
Inventors: 何培卿
Original assignee: Huizhou Zhi Shun Electronic Industry Co Ltd
Current assignee: Huizhou Zhi Shun Electronic Industry Co Ltd; Jeckson Electric Co Ltd
Priority date: 2013-03-01
Filing date: 2013-03-01
Publication date: 2013-07-31
Anticipated expiration: 2023-03-01

Abstract

The utility model provides a constant-voltage charging circuit which comprises a transformer, a voltage-stabilizing unit, a charging circuit and a processor, wherein the transformer is used for converting alternating current into lower direct current; the voltage-stabilizing unit is used for stabilizing the direct current voltage at a secondary side of the transformer at the primary side of the transformer; and the processor is used for detecting the state of a battery, and controlling the on and off of the charging circuit, and a winding for voltage output is arranged at the secondary side of the transformer. The constant-voltage charging circuit provides a charging voltage by adopting one winding, and is simple in production, fewer in elements, and capable of saving the cost.

Description

A kind of constant voltage charging circuit

Technical field

The utility model relates to charging circuit, particularly a kind of constant voltage charging circuit.

Background technology

NI-G, Ni-MH battery are the widely used in recent years batteries that repeats to discharge and recharge, since his application, the development that brings charger immediately.In ni-mh, nickel-cadmium cell charging field, widely popular is the charging modes of constant current.In simple terms, exactly no matter what kind of the state of battery is, cell voltage is low or height, charger can be continuously battery charge with an invariable electric current, until determining according to the battery charge characteristic till battery has been full of.

This charging modes needs whole charger system to provide a higher charging voltage for battery, also needing provides lower for processor, more stable voltage, simultaneously, in order to keep the stable of these two voltages, generally all need to place auxiliary winding and corresponding voltage regulation unit in transformer primary, so, for transformer, secondary coil just needs at least two windings that this two voltages are provided; Simultaneously because processor needs more stable voltage, so, also need corresponding voltage stabilizing circuit to come the supply power voltage of constant controller, more than 2 not only make complex manufacturing, production process increases, and circuit element is increased.

The utility model content

The utility model proposes a kind of constant voltage charging circuit, solve secondary coil provides two charging voltages at least with regard to two windings of needs problem.

The utility model discloses a kind of constant voltage charging circuit, comprise transformer, voltage regulation unit, charging circuit, processor, wherein, transformer is used for alternating current is converted to lower direct current; Voltage regulation unit is used for the direct voltage in described transformer primary stabilizing transformer primary side; Processor is used to detect battery status, and the break-make of control charge circuit, the primary side of described transformer have a winding that is used for a voltage output.

Further improve at constant voltage charging circuit described in the utility model, described voltage regulation unit is the chip with power management function.

Further improve at constant voltage charging circuit described in the utility model, described charging circuit is used for the powered battery for the resistance of having connected.

Further improve the circuit that described charging circuit and processor junction have at least one charging current at constant voltage charging circuit described in the utility model.

Further improve at constant voltage charging circuit described in the utility model, the circuit of described charging current has the combinational circuit of battery circuit and/or battery and resistance.

Implement a kind of constant voltage charging circuit of the present utility model, have following beneficial technical effects:

The secondary coil that is different from present technology just needs at least two windings that this two voltages are provided; Simultaneously because processor needs more stable voltage, so, also need corresponding voltage stabilizing circuit to come the supply power voltage of constant controller, more than 2 not only make complex manufacturing, production process increases, and circuit element is increased, the technical program adopts a winding that a voltage is provided, produce simply, element is few, saves cost.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is according to a functional-block diagram of the present utility model;

Fig. 2 is according to charging circuit block diagram of the present utility model.

Embodiment

Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.

See also Fig. 1, a kind of constant voltage charging circuit of the present utility model comprises voltage regulation unit 10, transformer 20, charging circuit 30, processor 40.

Wherein, voltage regulation unit 10 is for having the chip of power management function.

Charging circuit 30 is used for the powered battery for the resistance of having connected.

The circuit that charging circuit 30 and processor 40 connecting places have at least one charging current.

The circuit of charging current has the combinational circuit of battery circuit and/or battery and resistance.

Specifically, transformer 20: 90V is converted to the direct current of low voltage to the alternating current of 264V, for charge circuit and processor work;

Voltage regulation unit 10: at the direct voltage of transformer primary stabilizing transformer primary side;

Charging circuit 30: for battery provides charging current;

Processor 40: detect battery status, and the break-make of control charge circuit.

20 levels of transformer are surveyed has only a winding, voltage output, and this voltage output can be charging circuit 30 power supplies simultaneously, also is the power supply of processor 40, so this mode has at least produces simply, element such as lacks at advantage.

AC power (rectification, is filtered into universal method after over commutation, filtering, no longer tired stating) after being linked in the system, transformer 20 carries out transformation, be linked into charging circuit 30 through the low-voltage DC after the transformation, for charging circuit 30 provides charge power supply, simultaneously, described low-voltage direct supplies to processor 40, makes processor 40 detect battery status and control charging to enable.Through feedback, voltage regulation unit 10 makes described low-voltage dc voltage be stabilized in concrete numerical value, for example a 4.5V.So just reached the purpose of elementary constant voltage.Voltage regulation unit 10 can be existing more common power management class chip, for example LNK603 of PI.

Fig. 2 is the structure that further shows charging circuit.Charging circuit 30 is that 20 levels surveys of transformer direct voltage provides charge power supply by transformer 20 through the low-voltage dc voltage after the transformation mainly, charge switch by processor 40 controls, described switch can be that two triodes are composed in series, because be general technology, and no longer tired stating.

Whether simultaneously the A/D mouth of processor 40 is linked into the anode end, is used to detect battery status, for example, have battery to pack into, and whether battery is full of etc.Battery can be AA or AAA etc., depends on the mechanical structure of charger.The resistance of battery series connection certain numerical value, the effect of this resistance is to set battery charge.

As previously mentioned, this method is a constant voltage charge, and the voltage in the charge circuit is invariable in other words, in Fig. 2, specifically be exactly battery and the battery ohmically voltage of connecting be constant, so, by setting the resistance of resistance, just set the probable ranges of charging current.Probable ranges when why saying charging current, rather than concrete numerical value are because battery voltage in charging process can increase, and the electric current through battery will reduce to some extent so.

Among Fig. 2, except resistance R 18A, R18B, R18C, resistance R 19, the R20 that connects with the AAA battery is with the further refinement of charging current, and so just having reached a charger has two kinds of charging currents, the bigger needs that satisfied battery.

Further say,,, guaranteed the fail safe in the battery charging process so more so the voltage of battery in charging process can not surveyed the direct voltage of setting greater than transformer secondary output because be constant voltage charge.

Compare the charging modes of constant current, surveying at transformer secondary output only needs a winding, has lacked a coil in coiling, provides cost savings, and has simplified manufacture craft.

Survey in 20 levels of transformer power, do not need to be used for the similar LM7805 of voltage stabilizing, the voltage stabilizing circuit of LM431 and so on has reduced element, has dwindled volume, provides cost savings.

Charging current can be set different range, has increased the availability of battery.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.

Claims

1. a constant voltage charging circuit comprises transformer, voltage regulation unit, charging circuit, processor, and wherein, transformer is used for alternating current is converted to lower direct current; Voltage regulation unit is used for the direct voltage in described transformer primary stabilizing transformer primary side; Processor is used to detect battery status, and the break-make of control charge circuit is characterized in that, the primary side of described transformer has a winding that is used for a voltage output.

2. constant voltage charging circuit according to claim 1 is characterized in that, described voltage regulation unit is the chip with power management function.

3. constant voltage charging circuit according to claim 1 is characterized in that, described charging circuit is used for the powered battery for the resistance of having connected.

4. constant voltage charging circuit according to claim 1 is characterized in that, the circuit that described charging circuit and processor junction have at least one charging current.

5. constant voltage charging circuit according to claim 4 is characterized in that the circuit of described charging current has the combinational circuit of battery circuit and/or battery and resistance.