Charging system based on parallel connection of switch charging and linear charging

Abstract

The utility model belongs to the field of electronic product charging, and relates to a charging system based on parallel connection of switch charging and linear charging, which comprises a linear charging chip, a switch charging chip and a control circuit. A fifth interface of the linear charging chip and a sixth interface of the switch charging chip are arranged in parallel and are both connected with the battery, the control circuit comprises a P-type moss tube and a voltage division circuit, a grid electrode of the moss tube is connected with a charging interface VCC, a drain electrode of the moss tube is grounded, and a source electrode of the moss tube is connected with an eighth interface of the linear charging chip; a No.3 interface of the switch charging chip is connected with a grid electrode of the Moss tube; when the battery is fully charged through the switch charging chip, the third interface of the switch charging chip is converted into a low level, the eighth interface of the linear charging chip is converted into a high level, and the battery is charged. Therefore, the battery can be quickly charged through a pure hardware circuit and can be fully charged. And the scheme is simple and the cost is low.

Description

Technical Field

[0001] The present application belongs to the field of electronic product charging, and in particular to a charging system based on parallel connection of switch charging and linear charging. Background Art

[0002] Electronic products with batteries usually use switch-type charging chips for high-current fast charging, because switch-type charging chips have the advantages of high constant-current charging current and low heat generation, but the charging cut-off current in the constant-voltage stage will also be relatively large, resulting in the battery not being fully charged before charging ends. The trickle charging current is one-tenth of the constant current charging current. For example, the constant current charging current is 2A=2000MA, and the corresponding charging cut-off current is 200MA. The 200MA cut-off current is relatively large, and the battery is not fully charged.

[0003] That is, the switch-type pure hardware charging chip is set to charge quickly with a large current, but it cannot fully charge the battery.

[0004] The linear switch charging chip has poor heat dissipation, so the charging current is usually smaller than that of the switch charging chip. The corresponding charging cut-off current in the constant voltage stage will also be relatively small, which can fully charge the battery. The trickle charging current is one tenth of the constant current charging current. For example, the constant current charging current is 20MA, and the corresponding charging current is 2MA.

[0005] That is, the linear charging chip is set to charge with a small current, which can fully charge the battery, but the charging is slow.

[0006] Therefore, how to fully charge the battery while ensuring the charging speed is a problem that needs to be solved. Utility Model Content

[0007] The purpose of this application is to provide a charging system based on switch charging and linear charging in parallel to solve the problem in the prior art that it is difficult to simultaneously ensure charging speed and charging quality.

[0008] The technical solution of the present application is: a charging system based on switch charging and linear charging in parallel, comprising a linear charging chip, a switch charging chip and a control circuit, wherein interface No. 5 of the linear charging chip and interface No. 6 of the switch charging chip are arranged in parallel and are both connected to a battery, and the control circuit comprises a Morse tube and a voltage divider circuit connected to the Morse tube, wherein the Morse tube is a P-type Morse tube, wherein the gate of the Morse tube is connected to a charging interface VCC, the drain is grounded, and the source is connected to interface No. 8 of the linear charging chip; interface No. 3 of the switch charging chip is connected to the gate of the Morse tube; when the battery is fully charged through the switch charging chip, interface No. 3 of the switch charging chip is converted to a low level, and interface No. 8 of the linear charging chip is converted to a high level, and the battery is charged.

[0009] Preferably, the voltage divider circuit includes a second resistor and a fifth resistor, the second resistor is arranged between the charging interface VCC and the gate of the MOS tube, one end of the fifth resistor is connected to the gate of the MOS tube, and the other end is grounded.

[0010] Preferably, a third resistor is provided between interface No. 8 of the linear charging chip and the charging interface VCC, a first resistor is provided between interface No. 6 and interface No. 7 of the switch charging chip, and a fourth resistor is provided at interface No. 2 of the linear charging chip, and the other end of the fourth resistor is grounded.

[0011] The charging system based on switch charging and linear charging in parallel of the present application includes a linear charging chip, a switch charging chip and a control circuit. Interface No. 5 of the linear charging chip and interface No. 6 of the switch charging chip are arranged in parallel and are both connected to the battery. The control circuit includes a Moss tube and a voltage divider circuit. The Moss tube is a P-type Moss tube. The gate of the Moss tube is connected to the charging interface VCC, the drain is grounded, and the source is connected to interface No. 8 of the linear charging chip; interface No. 3 of the switch charging chip is connected to the gate of the Moss tube; when the battery is fully charged through the switch charging chip, interface No. 3 of the switch charging chip is converted to a low level, and interface No. 8 of the linear charging chip is converted to a high level to charge the battery. Thereby, the problem of fast charging of the battery and fully charging the battery through a pure hardware circuit is realized; at the same time, the solution is simple and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0013] Figure 1 This is the overall circuit structure diagram of this application.

[0014] 1. Linear charging chip; 2. Switch charging chip; 3. Moss tube; 4. First resistor; 5. Second resistor; 6. Third resistor; 7. Fourth resistor; 8. Fifth resistor. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] A charging system based on switching charging and linear charging in parallel. In order to combine the advantages of switching charging chips and linear charging chips, the two types of charging chips are used in parallel. In the constant current charging stage, the switching type charging chip is used for charging. In the trickle current and constant voltage charging stages, the switching type charging chip is turned off and the linear charging chip is switched to charge the battery.

[0017] like Figure 1 As shown, it specifically includes a linear charging chip 1, a switch charging chip 2 and a control circuit. The switch charging chip 2 uses the SLM6550 model, which is a 2A lithium-ion battery charger for 5V AC adapters. It uses a synchronous buck converter with a fixed frequency of 1.5MHz, so it has a charging efficiency of more than 90% and generates very little heat.

[0018] The SLM6550 includes a complete charge termination circuit, automatic recharging and a 4.35V preset charge voltage with an accuracy of ±1%. It also integrates multiple functions such as reverse charging protection, output short circuit protection, chip and battery temperature protection, etc.

[0019] The SLM6550 is available in SOP8 or MSOP8 packages with a heat sink and requires only a few external components, so it can be embedded in a variety of handheld applications as an efficient charger for large-capacity batteries.

[0020] Linear charging chip 1 uses TP4056 model, which is an excellent single-cell lithium-ion battery cross-current / constant voltage linear charger. TP4056 uses ES0P8 package with fewer peripheral components, making it very suitable for portable products, and suitable for powering USB power and adapter power.

[0021] Interface No. 5 of the linear charging chip 1 and interface No. 6 of the switch charging chip 2 are arranged in parallel and are both connected to the battery. The control circuit includes a Morse tube 3 and a voltage divider circuit connected to the Morse tube 3. The Morse tube 3 is a P-type Morse tube. The gate of the Morse tube 3 is connected to the charging interface VCC, the drain is grounded, and the source is connected to the interface No. 8 of the linear charging chip 1; the interface No. 3 of the switch charging chip 2 is connected to the gate of the Morse tube 3; when the battery is fully charged through the switch charging chip 2, the interface No. 3 of the switch charging chip 2 is converted to a low level, and the interface No. 8 of the linear charging chip 1 is converted to a high level to charge the battery.

[0022] The charging interface VCC5V is powered on, and after voltage division by the voltage divider circuit, it is transmitted to the gate of the moss tube 3, and the gate forms a high level of 2.5V at the gate. The moss tube 3 is turned on, and the interface 8 of the linear charging chip 1 is grounded to form a low level. The linear charging chip 1 does not work, and the battery cannot be charged; at this time, the switch charging chip 2 charges the battery. As time goes by, the battery charges according to the configuration charging current of the switch charging chip 2 until the battery is fully charged, and the interface 3 of the switch charging chip 2 is converted to a low level. At this time, the gate of the moss tube 3 is a low level, the moss tube 3 is not turned on, and the interface 8 of the linear charging chip 1 is converted to a high level. The linear charging chip 1 starts to work normally, and continues to charge the battery through a small trickle current until the battery is fully charged. Thereby realizing the problem of fast charging of the battery and fully charging the battery through a pure hardware circuit. At the same time, the application scheme is simple, low-cost, does not rely on MCU and software control, and has low development difficulty.

[0023] Preferably, the voltage divider circuit includes a second resistor 5 and a fifth resistor 8, wherein the second resistor 5 is provided between the charging interface VCC and the gate of the MOS tube 3, and one end of the fifth resistor 8 is connected to the gate of the MOS tube 3 and the other end is grounded. The voltage at the interface 8 of the linear charging chip 1 and the interface 3 of the switch charging chip 2 is adjusted by providing a voltage divider circuit.

[0024] Preferably, a third resistor 6 is provided between the interface No. 8 of the linear charging chip 1 and the charging interface VCC, and the third circuit can pull up the interface No. 8 of the linear charging chip 1 to ensure stable charging.

[0025] A first resistor 4 is provided between interface No. 6 and interface No. 7 of the switch charging chip 2, a fourth resistor 7 is provided at interface No. 2 of the linear charging chip 1, and the other end of the fourth resistor 7 is grounded.

[0026] Finally, it should be noted that: the drawings of the embodiments disclosed in the present utility model only involve structures related to the embodiments disclosed in the present utility model, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0027] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A charging system based on parallel connection of switch charging and linear charging, Features: The invention comprises a linear charging chip (1), a switch charging chip (2) and a control circuit, wherein a No. 5 interface of the linear charging chip (1) and a No. 6 interface of the switch charging chip (2) are arranged in parallel and are both connected to a battery, and the control circuit comprises a Morse tube (3) and a voltage divider circuit connected to the Morse tube (3), wherein the Morse tube (3) is a P-type Morse tube, wherein the gate of the Morse tube (3) is connected to a charging interface VCC, the drain is grounded, and the source is connected to the No. 8 interface of the linear charging chip (1); the No. 3 interface of the switch charging chip (2) is connected to the gate of the Morse tube (3); when the battery is fully charged by the switch charging chip (2), the No. 3 interface of the switch charging chip (2) is converted to a low level, and the No. 8 interface of the linear charging chip (1) is converted to a high level, so as to charge the battery.

2. The charging system based on switch charging and linear charging in parallel as claimed in claim 1, Features: The voltage divider circuit comprises a second resistor (5) and a fifth resistor (8), wherein the second resistor (5) is arranged between the charging interface VCC and the gate of the MOS tube (3), and one end of the fifth resistor (8) is connected to the gate of the MOS tube (3) and the other end is grounded.

3. The charging system based on switch charging and linear charging in parallel as claimed in claim 1, Features: A third resistor (6) is provided between interface No. 8 of the linear charging chip (1) and the charging interface VCC, a first resistor (4) is provided between interface No. 6 and interface No. 7 of the switch charging chip (2), and a fourth resistor (7) is provided at interface No. 2 of the linear charging chip (1), and the other end of the fourth resistor (7) is grounded.

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