Safety management charging circuit

Abstract

The utility model relates to a safety management charging circuit. The safety management charging circuit comprises a power supply unit, a delay switch unit, a control unit, a load charging unit and a feedback unit, the power supply unit, the time delay switch unit, the control unit and the load charging unit are electrically connected in sequence; the time delay switch unit is used for switching on or off the power supply of the power supply unit in a time delay manner; the feedback unit monitors a charging signal of the load charging unit in real time and feeds back the charging signal to the control unit; the control unit controls the charging mode of the load charging unit according to the feedback signal; the charging circuit is controlled to be switched on or switched off through the time delay switch unit in a time delay mode, and therefore the risk that equipment is burnt out due to hot plugging is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of electronic circuits, and in particular to a safe management charging circuit. Background Art

[0002] When the power input interface is connected to the power supply to charge the battery, sparks will appear at the moment of insertion, which is called surge, also known as instantaneous pulse voltage. It is a short-term current in the circuit, lasting one millionth of a second, and fluctuating violently. The pulse voltage can easily cause the power input interface to burn out. Therefore, in order to solve the above technical problems, it is urgent to develop a charging circuit with safe management. Summary of the invention

[0003] The present invention is to solve one of the above technical problems and provide a safe management charging circuit, which can delay the turning on of the charging circuit and charge the battery after the current and voltage in the circuit are stable, thereby avoiding the burning of the power interface.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A safety management charging circuit includes a power supply unit, a delay switch unit, a control unit, a load charging unit and a feedback unit;

[0006] The power supply unit, the delay switch unit, the control unit, and the load charging unit are electrically connected in sequence;

[0007] The delay switch unit is used to delay turning on or off the power supply of the power supply unit;

[0008] The feedback unit monitors the charging signal of the load charging unit in real time and feeds it back to the control unit;

[0009] The control unit controls a charging mode of the load charging unit according to a feedback signal.

[0010] It is further defined as follows: the delay switch unit includes a field effect transistor Q1, one end of the power supply unit is divided into three paths, the first path is connected to the source of the field effect transistor Q1, the second path is connected to one end of the resistor R67, and the third path is connected to one end of the resistor R47. The other end of the resistor R67 is respectively connected to the positive electrode of the polarity capacitor C47 and one end of the resistor R41, the other end of the resistor R41 is respectively connected to one end of the resistor R30 and the base of the transistor Q10, the collector of the transistor Q10 is connected to one end of the resistor R51, and the node after the other end of the resistor R47 is connected to the other end of the resistor R51 is connected to the gate of the field effect transistor Q1, the drain of the field effect transistor Q1 is connected to the control unit, the negative electrode of the polarity capacitor C47, the other end of the resistor R30 and the emitter of the transistor Q10 are connected and then grounded, and the other end of the power supply unit is grounded.

[0011] It is further defined that the delay switch unit is electrically connected to the control unit via a unidirectional circuit.

[0012] It is further defined that the delay switch unit is electrically connected to the control unit via a filter circuit.

[0013] It is further defined that the control unit is connected to a battery cell number detection circuit, and the battery cell number detection circuit can detect the battery cell number information and feed it back to the control unit.

[0014] It is further defined that the control unit is connected to a charging status display unit, and the control unit controls the charging status display unit to display the charging status according to a feedback signal of a feedback unit.

[0015] It is further defined that the control unit is a chip model ASC6213.

[0016] After adopting the above technical solution, the invention has at least the following beneficial effects:

[0017] 1. The field effect transistor Q1 and the transistor Q10 form a thermal plug protection delay switch circuit, which can avoid the risk of hot plug burning the equipment.

[0018] 2. Select different resistors in the battery cell number detection circuit to configure the optional circuit to achieve different battery cell numbers.

[0019] 3. The charging circuit created by the present invention uses the charging management chip ASC6213, which supports 1 to 4 lithium battery synchronous switch buck charging management chips, realizes high-efficiency charging and simplifies peripheral devices, reducing BOM costs. By adjusting the detection resistor, a maximum charging current of 2A can be achieved, with an efficiency of up to 93%. The chip has multiple protection functions: over-temperature thermal feedback regulation, over-temperature shutdown, charging timing, battery overvoltage and short-circuit protection, battery temperature detection, abnormal charging stops and abnormal light indication. Thermal feedback regulation is to reduce the charging current to maintain the internal temperature of the chip under the condition of not exceeding 125°C. If the junction temperature exceeds 155°C, it will perform over-temperature shutdown protection and stop working to ensure reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a circuit principle block diagram created by the present invention;

[0021] Figure 2 It is the circuit principle diagram created by the present invention;

[0022] Figure 3 This is a circuit diagram for charging a battery;

[0023] Figure 4 This is the circuit schematic for charging two batteries;

[0024] Figure 5 This is the circuit schematic for charging three batteries;

[0025] Figure 6 This is the circuit schematic for charging four batteries. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments in the present application and the features described in the embodiments may be combined with each other. The present application is further described in detail below in conjunction with the drawings and specific embodiments.

[0027] As attached Figure 1As shown, a safety management charging circuit includes a power supply unit 1, a delay switch unit 2, a control unit 3, a load charging unit 4 and a feedback unit 5; specifically, the control unit 3 is a chip model ASC6213; the power supply unit 1, the delay switch unit 2, the control unit 3, and the load charging unit 4 are electrically connected in sequence; the delay switch unit 2 is used to delay the on or off of the power supply of the power supply unit 1, and the delay switch unit 2 can effectively avoid the risk of hot plugging and burning the equipment; the feedback unit 5 monitors the charging signal of the load charging unit 4 in real time and feeds it back to the control unit; the control unit 3 controls the charging mode of the load charging unit 4 according to the feedback signal; further, the pin VIN of the chip ASC6213 is connected to the delay switch unit 2, the pin BS and the pin LX of the chip ASC6213 are connected to the load charging unit 4, the pin CS of the chip ASC6213 is used to receive the current signal of the feedback unit 5, and the pin BAT of the chip ASC6213 is used to receive the voltage signal of the feedback unit 5.

[0028] As attached Figure 2 As shown, the delay switch unit 2 includes a field effect transistor Q1, and one end of the power supply unit 1 is divided into three paths, the first path is connected to the source of the field effect transistor Q1, the second path is connected to one end of the resistor R67, and the third path is connected to one end of the resistor R47. The other end of the resistor R67 is respectively connected to the positive electrode of the polarity capacitor C47 and one end of the resistor R41, and the other end of the resistor R41 is respectively connected to one end of the resistor R30 and the base of the transistor Q10. The collector of the transistor Q10 is connected to one end of the resistor R51, and the node after the other end of the resistor R47 is connected to the other end of the resistor R51 is connected to the gate of the field effect transistor Q1. The drain of the field effect transistor Q1 is connected to the control unit 3, and the negative electrode of the polarity capacitor C47, the other end of the resistor R30 and the emitter of the transistor Q10 are connected and then grounded, and the other end of the power supply unit 1 is grounded.

[0029] The load charging unit 4 includes a capacitor C37, a capacitor C38, a resistor R70, an inductor L1 and a battery interface terminal J3. The pin LX of ASC6213 is divided into three paths. The first path is connected to the pin BS through the capacitor C38, the second path is connected to one end of the inductor L1, and the third path is grounded through the resistor R70. The other end of the inductor L1 is connected to the battery interface terminal J3 through the feedback unit 5.

[0030] The feedback unit 5 includes a resistor R24, a resistor R35, a resistor R36, a capacitor C57, a capacitor C62 and a capacitor C53. The pin CS of the chip ASC6213 is respectively connected to one end of the capacitor C57, one end of the resistor R36, one end of the resistor R35, the other end of the inductor L1 and one end of the resistor R24. The pin BAT of the chip ASC6213 is respectively connected to one end of C62, the other end of the resistor R36, the other end of the resistor R35, the other end of the resistor R24, one end of the capacitor C53 and the battery interface terminal J3. The other end of the capacitor C57, the other end of the capacitor C62 and the other end of the capacitor C53 are connected and then grounded.

[0031] As attached Figure 1 and attached Figure 2 As shown, the delay switch unit 2 is electrically connected to the control unit 3 through a unidirectional circuit 6. The unidirectional circuit 6 includes a diode D9 and a diode D10. The positive poles of the diodes D9 and D10 connected in parallel in the same direction are connected to the drain of the field effect transistor Q1, and the negative poles of the diodes D9 and D10 connected in parallel are connected to the electrical control unit 3. The unidirectional circuit 6 is used to control the direction of current flow to protect the circuit from excessive load.

[0032] As attached Figure 1 and attached Figure 2 As shown, the delay switch unit 2 is electrically connected to the control unit 3 through the unidirectional circuit 6 and the filter circuit 7 in sequence. The filter circuit 7 includes a capacitor C34 and a capacitor C42. One end of the capacitor C34 and the capacitor C42 connected in parallel is connected to the cathode of the diode D9 and the diode D10 connected in parallel in the same direction, and the other end is grounded. Its function is to remove unnecessary frequency components from the input signal so as to better process and analyze the signal.

[0033] As attached Figure 1 and attached Figure 2 As shown, the control unit 3 is connected to a battery cell number detection circuit 8, and the battery cell number detection circuit 8 can detect the information of the battery cell number and feed it back to the control unit 3. The battery cell number detection circuit 8 is limited according to the actual number of charged batteries, 1 to 4; the battery cell number detection circuit 8 includes a resistor R69, or R72, or R69, R72, or left unconnected. Specifically, the electronic designer connects a resistor R69, or R72, or R69, R72, or left unconnected to the pin CELL of the chip ASC6213 according to actual needs; the pin can identify the number of charged batteries through a level signal or other signal, so that the control unit 3 controls the charging voltage output of the corresponding number of battery cells according to the signal received by the pin. For example, as shown in the attached Figure 3As shown, if charging one battery, the pin CELL is connected to the cathode of the diode D9 and the diode D10 connected in parallel in the same direction through the resistor R69, the pin CELL is recognized as a high level signal, and the control unit 3 controls the corresponding one battery charging voltage output; as shown in the attached Figure 4 As shown, if two batteries are charged, the CELL pin is left floating, and the control unit 3 controls the corresponding charging voltage output of the two batteries; Figure 5 As shown, if three batteries are charged, the pin CELL is grounded through the resistor R72, the pin CELL is recognized as a low level signal, and the control unit 3 controls the corresponding three battery charging voltage outputs; as shown in the attached Figure 6 As shown, if 4 batteries are charged, the pin CELL is connected to one end of the resistor R69 and one end of the resistor R72 respectively, the other end of the resistor R69 is connected to the cathode of the diode D9 and the diode D10 connected in parallel in the same direction, the other end of the resistor R72 is grounded, the pin CELL is recognized as a potential difference signal, and the control unit 3 controls the corresponding charging voltage output of the 4 batteries.

[0034] As attached Figure 1 and attached Figure 2 As shown, the control unit 3 is connected to a charging status display unit 9. The control unit 3 controls the charging status displayed by the charging status display unit 9 according to the feedback signal of the feedback unit 5. The charging status display unit 9 can be an indicator light. For example, the indicator light is "red" during charging and the indicator light is "green" after being fully charged.

[0035] The specific working principle is as follows: the power supply unit 1 is turned on, and after the capacitor C47 is fully charged, the transistor Q10 is delayed to be turned on and the field effect tube Q1 is driven to be turned on at the same time. At this time, the power supply unit 1, the delay switch unit 2, the control unit 3, and the load charging unit 4 are electrically connected to each other. The control unit 3 outputs a corresponding voltage to the load charging unit 4 according to the signal of the battery cell number detection circuit 8. The control unit 3 can perform four charging stages on the load charging unit 4, namely trickle charging (low-voltage pre-charging), constant current charging, constant voltage charging, and charging termination, thereby realizing the trickle charging mode, standard charging mode, and fast charging mode of the battery. The feedback unit 5 monitors the charging signal of the load charging unit 4 in real time and feeds it back to the control unit. The control unit 3 controls the charging status display unit 9 to display the corresponding charging status according to the feedback signal.

[0036] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various equivalent changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety management charging circuit, characterized in that: It includes a power supply unit, a time delay switch unit, a control unit, a load charging unit and a feedback unit; The power supply unit, the delay switch unit, the control unit, and the load charging unit are electrically connected in sequence; The delay switch unit is used to delay turning on or off the power supply of the power supply unit; The control unit is connected to a battery cell number detection circuit, and the battery cell number detection circuit can detect the number of battery cells and feed back information to the control unit; The control unit outputs a corresponding voltage to the load charging unit according to the fed-back information on the number of battery cells; The feedback unit monitors the charging signal of the load charging unit in real time and feeds it back to the control unit; The control unit controls the load charging unit to perform different charging stages according to the fed-back charging signal, so as to realize different charging modes.

2. The safety management charging circuit according to claim 1, characterized in that: The delay switch unit includes a field effect transistor Q1, and one end of the power supply unit is divided into three paths, the first path is connected to the source of the field effect transistor Q1, the second path is connected to one end of the resistor R67, and the third path is connected to one end of the resistor R47. The other end of the resistor R67 is respectively connected to the positive electrode of the polarity capacitor C47 and one end of the resistor R41, and the other end of the resistor R41 is respectively connected to one end of the resistor R30 and the base of the transistor Q10. The collector of the transistor Q10 is connected to one end of the resistor R51, and the node after the other end of the resistor R47 is connected to the other end of the resistor R51 is connected to the gate of the field effect transistor Q1, the drain of the field effect transistor Q1 is connected to the control unit, the negative electrode of the polarity capacitor C47, the other end of the resistor R30 and the emitter of the transistor Q10 are connected and then grounded, and the other end of the power supply unit is grounded.

3. The safety management charging circuit according to claim 1, characterized in that: The time delay switch unit is electrically connected to the control unit via a unidirectional circuit.

4. The safety management charging circuit according to claim 1, characterized in that: The delay switch unit is electrically connected to the control unit via a filter circuit.

5. The safety management charging circuit according to claim 1, characterized in that: The control unit is connected to a charging status display unit, and the control unit controls the charging status display unit to display the charging status according to a feedback signal from the feedback unit.

6. The safety management charging circuit according to any one of claims 1 to 5, characterized in that: The control unit is a chip model ASC6213.

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