AU2018101003A4

AU2018101003A4 - Charger

Info

Publication number: AU2018101003A4
Application number: AU2018101003A
Authority: AU
Inventors: Weifeng Chen
Original assignee: Shanghai New Sun Electronic Co Ltd
Current assignee: Shanghai New Sun Electronic Co Ltd
Priority date: 2018-06-05
Filing date: 2018-07-18
Publication date: 2018-08-23
Anticipated expiration: 2026-07-18
Also published as: CN208539592U; GB201811809D0

Abstract

The utility model discloses a charger, and relates to the technical field of electrical equipment. The charger comprises a charging module, a control module and a battery voltage detection module; the charging module is used for providing a charging voltage; and the control module is used for controlling the working state of the 10 charging module, the control module controls the charging module to issue a charging pulse at an output terminal, and the control module detects whether current exists in a charging loop while the charging module is issuing the charging pulse. When the current exists, the control module controls the charging module to start a charging mode; in the period when the charging module does not issue the charging pulse: the 15 battery voltage detection module detects the voltage of a positive pole to a negative pole of the output terminal of the charging module, when the voltage is detected, the charging module starts the charging mode; and when the voltage is not detected, the control module controls the charging module to issue the charging pulse at the output terminal. Compared with the prior art, the utility model improves the convenience of 20 use and is also more secure. Rectifying module Depressurization module Charging module Driving circuit Operational amplifier module Battery voltage Control module __ detection module Reverse detection module Figure 1

Description

CHARGER

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to a charger.

Background Art

With improvement of living standards, the popularizing rate of batteries is also getting higher and higher. As a result, the use rate of chargers is also getting higher and higher, while the existing chargers have many shortcomings.

At present, there are two types of chargers: one is that the charger output is not energized, and a charged battery needs to keep several volts to be detected by the charger, so that the charger can be started. The other one is that the charger output is energized, but when a charger clip is connected to a battery terminal or when the clip is short connected or when the charger is reversely connected with the battery, the charger can generate a large spark.

As disclosed in Chinese Patent No. 107968470A, a charger comprises a charging circuit board, a shell, a power output port, an energy storage device placed in the shell, a unidirectional conduction circuit placed in the shell, and a switch set on the shell; the input terminal of the energy storage device is connected to the input terminal of the power output port through the unidirectional conduction circuit, the unidirectional conduction circuit comprises a first diode and a second diode which are respectively connected to a positive power line and a negative power line, and the conduction direction is from the power output port to the energy storage device; and the output terminal of the energy storage device is connected to the output terminal of the power output port through the switch, and the switch is used for controlling an output line connecting the output terminal of the energy storage device to the charger.

Summary of the Utility Model 1. Technical problems to be solved

In view of the above-mentioned defects in the prior art, there are problems that a charged battery needs a few volts to charge and a current charger is poor in safety performance. 2. Technical scheme

To solve the above problems, a charger is provided. The charger comprises a charging module, a control module and a battery voltage detection module; the charging module is used for providing charging voltage; the control module is used for controlling the working state of the charging module, the control module controls the charging module to issue a charging pulse at the output terminal, the control module detects whether the charging circuit has the current while the charging module issues the charging pulse, and when the current exists, the control module controls the charging module to start a charging mode; during a period of time when the charging module does not issue the charging pulse: the battery voltage detecting module detects the voltage of the positive pole to the negative pole of the charging module output terminal; when the voltage is detected, the charging module starts the charging mode; and when the voltage is not detected, the control module controls the charging module to issue the charging pulse at the output terminal.

The charger also comprises a rectifying circuit, and the rectifying circuit is electrically connected with the electric power to provide direct current.

The charger also comprises a step-down circuit, and the step-down circuit is used for providing low voltage direct current.

The output terminal of the charging module is provided with a current sampling carrier, and the control module determines whether the output terminal of the charging module has current by the current sampling carrier.

The control module determines whether the current sampling carrier has the current by sampling the voltage at both ends of the current sampling carrier.

The charger also comprises an operational amplifier module, and the operational amplifier module is used for amplifying the voltage at both ends of the current sampling carrier of the control module.

The output terminal of the charging module is provided with a switch, and the control module turns on or off the charging circuit through the switch.

The charger also comprises a driving circuit, and the driving circuit controls the working state of the switch through the driving circuit.

The charger also comprises a reverse connection detection module, and the control module detects whether the positive pole and the negative pole of the charging module are reversely connected through the reverse connection detection module. Beneficial effects of the utility model

Compared with the prior art, the present utility model solves the problem that when an existing output energized charger is connected to the battery terminal or when the clip is short connected or when the charger is reversely connected with the battery, a large spark is generated through de-energizing the output terminal when the charging mode is not started. The safety is improved and the phenomenon that the large spark generated by the existing output energized charger when the charger is connected with the terminal may scare a user is avoided.

The utility model also solves the problem that the output de-energized charger cannot charge a OV battery by repeatedly issuing the charging pulses to the charged battery being and activating the voltage inside the battery.

The utility model also detects whether the charged battery is reversely connected through the reverse connection detection module and issues an alarm when the charged battery is reversely connected, thereby improving the convenience and making the utility model more secure.

Brief Description of the Drawings

Figure 1 is a main connection diagram of the utility model;

Figure 2 is a first part of a circuit schematic diagram of the embodiment of the utility model;

Figure 3 is a second part of a circuit schematic diagram of the embodiment of the utility model;

Figure 4 is a schematic diagram of a pulse wave of the embodiment of the utility model;

Figure 5 is a schematic flowchart of an embodiment 3 of the utility model.

Detailed Description of the Utility model

The following further describes in detail the specific implementation manners of the present utility model with reference to the accompanying drawings and embodiments. The following examples serve to illustrate the present utility model but not intended to limit the scope of the utility model.

Embodiment 1:

As shown in figure 1, a rectifying circuit is electrically connected with the electric power, and the rectifying circuit converts 220 V AC to 300 V DC and provides the charging module and the step-down module; the step-down module reduces the voltage of 300 V to 25 V or 5 V, providing working voltage for the control module, the operational amplifier module and other circuits; and the battery voltage detection module is in communicating junction with the control module to detect the voltage of the charged battery.

As shown in figure 2 to figure 4, a PD4 port of a single-chip microcomputer JP1 outputs a pulse wave and conducts a power CMOS transistor Q5 that is connected in series with the positive pole of the output terminal of the charging module through the driving circuit composed of a triode Q3, a triode Q4 and a resistor R23. The conducting is cut off after a very short time. In this embodiment, the time is 40 microseconds; and the charging loop of the present utility model issues the charging pulse.

During the period time of pulse wave high level, the voltage at the two ends of a constantan wire R50, which is connected in series with the negative pole of the charging module, is sampled, is amplified by the operational amplifier module composed of an operational amplifier U5C and an operational amplifier U5A, and is sent to an MCU JP1. Weather the current exists is determined by program calculation. When current exists: it means that the charged battery is correctly connected to an OUT+ terminal and an OUT- terminal of the charger, and the charging mode is enabled, that is, the single-chip microcomputer JP1 enables the power CMOS transistor Q5 to conduct continuously for charging the charged battery.

After the high pulse wave lasting for 40 microseconds, the battery voltage detection circuit consisting of resistors RIO and Rll detects whether the positive pole of the output terminal of the charging module has voltage to the negative pole.

When the voltage is detected: it means that the battery is correctly connected to the OUT+ terminal and the OUT- terminal of the charger. The battery voltage detection circuit sends a voltage signal to start the charging mode.

When no voltage is detected: the battery voltage detection circuit sends a no-voltage signal, and the PD4 port of the single-chip microcomputer JP1 outputs a pulse wave after 500 microseconds.

As shown in figure 5, the charging method of the utility model comprises: firstly, issuing a charging pulse by the charging module; then detecting if there is current in the charging circuit: if there is current, then starting the charging mode; if there is no current, checking whether the voltage of the charged battery can be detected; if the voltage of the charged battery can be detected, starting the charging mode; and if the voltage of the charged battery cannot be detected, re-issuing the charging pulse by the charging module.

The output terminal of the utility model is not energized when the charging mode is not started. Therefore, when the utility model is connected with the battery terminal or when the clip is short connected or when the battery is reversely connected, the spark will not be generated. The safety is improved and the phenomenon that the large spark generated by the existing output energized charger when the charger is connected with the terminal may scare a user is avoided.

The utility model also solves the problem that the output de-energized charger cannot charge a 0V battery by repeatedly issuing the charging pulse to the charged battery and activating the voltage inside the battery.

Embodiment 2:

As shown in figure 3, according to this embodiment, a reverse connection alarm function is also provided on the basis of embodiment 1. When the reverse connection detection module composed of the triode Ql, the triode Q2, and the diode D1 detects a battery reverse connection, the reverse connection detection module sends a reverse connection signal. After receiving the signal from the PD2 port of the single-chip microcomputer JP1, the single-chip microcomputer JP1 controls a buzzer LSI to send an alarm to remind the user of the battery reverse connection, which improves the convenience and makes the utility model more secure.

The above embodiments are only used to illustrate the present utility model, and are not intended to limit the present utility model. Those skilled in the related art may make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also belong to the scope of the utility model, and the patent protection scope of the utility model should be defined by the claims.

Claims

1. A charger, which is characterized by comprising a charging module, a control module and a battery voltage detection module; the charging module is used for providing a charging voltage; the control module is used for controlling the charging module, so that the charging module issues a charging pulse at an output terminal; the control module is also used for detecting whether current exists in a charging loop while the charging module is issuing a charging pulse and controlling the charging module to start the charging mode when the current exists; the battery voltage detection module is used for detecting the voltage of a positive pole to a negative pole of the output terminal of the charging module, and capable of transmitting a detected voltage signal or a no-voltage signal to the control module; the control module can be used for receiving the voltage signal and controlling the charging module to start a charging mode; and the control module can also be used for receiving the no-voltage signal and control the charging module to issue a charging pulse at the output terminal.

2. A charger of claim 1, characterized by also comprising a rectifying circuit, the rectifying circuit being electrically connected with an electric power to provide direct current.

3. A charger of claim 1, characterized by also comprising a step-down circuit, the step-down circuit being used for providing low voltage direct current.

4. A charger of claim 1, characterized in that the output terminal of the charging module is provided with a current sampling carrier, and the control module determines whether the output terminal of the charging module has current by the current sampling carrier.

5. A charger of claim 4, characterized in that the control module determines whether the current sampling carrier has the current by sampling the voltage at both ends of the current sampling carrier.

6. A charger of claim 5, characterized by also comprising an operational amplifier module, the operational amplifier module being used for amplifying the voltage at both ends of the current sampling carrier of the control module.

7. A charger of claim 1, characterized in that the output terminal of the charging module is provided with a switch, and the control module turns on or off a charging loop through the switch.

8. A charger of claim 7, characterized by also comprising a driving circuit, the driving circuit controlling the working state of the switch through the driving circuit.

9. A charger of claim 1, characterized by also comprising a reverse connection detection module, the control module detecting whether the positive pole and the negative pole of the charging module are reversely connected through the reverse connection detection module.