CN204481503U - A kind of level lithium battery charging management circuit - Google Patents

Abstract

The utility model relates to the technical field of battery charging control, in particular to a charging management circuit for a lithium battery of a wire casting instrument. It includes the SUN4006 charging management chip, the first MOS tube and the second MOS tube. Pin 1 of the SUN4006 chip is grounded through the fifth resistor, the second light-emitting diode, and the first capacitor. Pin 7 of the SUN4006 chip is grounded through the fourth resistor and the first light-emitting diode. The diode is connected to the positive pole of the first capacitor. Pin 5, pin 2, and pin 6 of the SUN4006 chip are respectively connected to the positive pole of the first capacitor through the first resistor, the second resistor, and the third resistor. Pin 4 of the SUN4006 chip passes through the sixth resistor. It is divided into two branches, one branch is connected to pin 9 of the SUN4006 chip through the third diode, and the other branch is grounded through the second capacitor. The first MOS tube, the second MOS tube and the seventh resistor form an anti-battery reverse connection circuit. The utility model uses a power adapter instead of a standard charger, and uses a SUN4006 charging management chip to design the charging management function in the control circuit of the wire thrower. , with high performance, simple circuit, good stability and so on.

Description

A lithium battery charging management circuit for a line throwing instrument

technical field

The utility model relates to the technical field of battery charging control, in particular to a charging management circuit for a lithium battery of a wire casting instrument.

Background technique

As a portable laser construction tool, the wire caster has high requirements on volume and battery life. The characteristics of lithium batteries are in line with such requirements, so in recent years, they have been more and more used in wire throwing instruments.

Due to the portable structure design, the lithium battery is basically designed as a non-detachable type, which is directly fixed inside the wire thrower, and the shell part is reserved for charging jacks. In the actual use of the line throwing instrument, it is required that the instrument can work normally in the charging state. In this mode, it is difficult for the existing standard lithium battery charger to effectively detect and control the charging of the line throwing instrument lithium battery. According to the latest energy consumption certification standard CEC-400-2011-005 in California, USA, it will be enforced from February 1, 2013, and the energy consumption of standard chargers and rechargeable battery systems has been clearly stipulated, and higher indicators have been proposed Require. Since this standard is aimed at chargers and rechargeable battery systems, it is very difficult to meet CEC certification only by improving the design of chargers, and a series of certification costs and time consumption are very large.

Utility model content

Aiming at the deficiencies in the above-mentioned prior art, the purpose of this utility model is to provide a wire casting device that uses a power adapter instead of a standard charger, uses a SUN4006 charging management chip, and designs the charging management function in the wire feeding device control circuit Lithium battery charging management circuit, this circuit has the advantages of high performance, simple circuit and stability.

In order to achieve the above object, the utility model adopts the following technical solutions:

A lithium battery charging management circuit for a wire throwing instrument, which includes a SUN4006 charging management chip, and is characterized in that it also includes a first MOS tube and a second MOS tube, and pin 1 of the SUN4006 charging management chip passes through the fifth resistor, The second light-emitting diode and the first capacitor are grounded. The 7 pins of the SUN4006 charging management chip are connected to the positive pole of the first capacitor through the fourth resistor and the first light-emitting diode in turn. The 5 pins and 2 pins of the SUN4006 charging management chip pin and pin 6 are respectively connected to the positive pole of the first capacitor through the first resistor, the second resistor and the third resistor, and the pin 4 of the SUN4006 charge management chip is divided into two branches after passing through the sixth resistor, and one branch passes The third diode is connected to pin 9 of the SUN4006 charging management chip, and the other branch is grounded through the second capacitor.

A lithium battery is connected between the gate of the first MOS transistor and the negative electrode of the third diode, and the gate of the first MOS transistor is also connected to the drain of the second MOS transistor. The drain of the first MOS transistor is divided into two branches, one branch is connected to the cathode of the third diode through the seventh resistor, and the other branch is connected to the gate of the second MOS transistor.

Due to the adoption of the above scheme, the utility model uses the power adapter instead of the standard charger, and uses the SUN4006 charging management chip to design the charging management function in the control circuit of the wire casting device, which can effectively detect the charging of the lithium battery of the wire casting device And control, the performance of all aspects of the circuit fully meets the requirements of the line thrower for charging management. It has the advantages of high performance, simple circuit, and good stability.

Description of drawings

Fig. 1 is the overall circuit diagram of the utility model embodiment.

Detailed ways

The embodiments of the utility model will be described in detail below in conjunction with the accompanying drawings, but the utility model can be implemented in various ways defined and covered by the claims.

As shown in Figure 1, a charging management circuit for a lithium battery of a wire casting instrument in this embodiment includes a SUN4006 charging management chip U, a first MOS transistor Q1 and a second MOS transistor Q2, and 1 of the SUN4006 charging management chip U The feet are grounded sequentially through the fifth resistor R5, the second light-emitting diode D2, and the first capacitor C1, and the 7-pin of the SUN4006 charging management chip U is connected to the first capacitor C1 through the fourth resistor R4 and the first light-emitting diode D1 in turn. The positive pole of the SUN4006 charging management chip U, pins 5, 2 and 6 are respectively connected to the positive pole of the first capacitor C1 through the first resistor R1, the second resistor R2, and the third resistor R3, and the SUN4006 charges Pin 4 of the management chip U is divided into two branches through the sixth resistor R6, one branch is connected to pin 9 of the SUN4006 charging management chip U through the third diode D3, and the other branch is grounded through the second capacitor C2.

A lithium battery BAT is connected between the gate of the first MOS transistor Q1 and the cathode of the third diode D3, and the gate of the first MOS transistor Q1 is also connected to the gate of the second MOS transistor Q2. Drain, the drain of the first MOS transistor Q1 is divided into two branches, one branch is connected to the cathode of the third diode D3 through the seventh resistor R7, and the other branch is connected to the second MOS gate of transistor Q2.

In this embodiment, the power adapter is used to replace the standard charger, and the SUN4006 charging management chip is used to design the charging management function in the control circuit of the wire throwing instrument. The first light-emitting diode D1 and the second light-emitting diode D2 in the figure are used as the charging status Indicates that the first MOS transistor Q1, the second MOS transistor Q2 and the seventh resistor R7 form an anti-battery reverse connection circuit to prevent damage caused by battery reverse connection. The third resistor R3 is used to set the charging current, and the sixth resistor R6 is used to adjust the charging end voltage. In order to ensure the voltage accuracy, a resistor with an error of ±1% is selected, and its resistance value is proportional to the end voltage. The sixth resistor R6 is increased by 2K The ending voltage is raised by 10mV. The performance of the circuit in all aspects fully meets the requirements of the line thrower for charging management, and has the advantages of high performance, simple circuit, and good stability.

The above descriptions are only preferred embodiments of the present utility model, and are not therefore limiting the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the specification of the utility model and the contents of the accompanying drawings may be directly or indirectly used in Other relevant technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (1)

1. A charging management circuit for a lithium battery of a wire throwing instrument, which includes a SUN4006 charging management chip, and is characterized in that it also includes a first MOS tube and a second MOS tube, and pin 1 of the SUN4006 charging management chip passes through the fifth The resistance, the second light-emitting diode, and the first capacitor are grounded, the 7 pins of the SUN4006 charging management chip are connected to the positive pole of the first capacitor through the fourth resistor and the first light-emitting diode in turn, and the 5 pins of the SUN4006 charging management chip , pin 2, and pin 6 are respectively connected to the positive pole of the first capacitor through the first resistor, the second resistor, and the third resistor, and pin 4 of the SUN4006 charging management chip is divided into two branches after passing through the sixth resistor, one One branch is connected to pin 9 of the SUN4006 charging management chip through the third diode, and the other branch is grounded through the second capacitor; A lithium battery is connected between the gate of the first MOS transistor and the negative electrode of the third diode, and the gate of the first MOS transistor is also connected to the drain of the second MOS transistor. The drain of the first MOS transistor is divided into two branches, one branch is connected to the cathode of the third diode through the seventh resistor, and the other branch is connected to the gate of the second MOS transistor.