CN109638918B - Charging circuit and electronic equipment - Google Patents
Charging circuit and electronic equipment Download PDFInfo
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- CN109638918B CN109638918B CN201811593129.2A CN201811593129A CN109638918B CN 109638918 B CN109638918 B CN 109638918B CN 201811593129 A CN201811593129 A CN 201811593129A CN 109638918 B CN109638918 B CN 109638918B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
Abstract
The invention provides a charging circuit, which comprises a charging control chip and a monitoring bleeder module, wherein the charging control chip stops charging a battery according to an overcharge state signal output by the monitoring bleeder module; the voltage monitoring and discharging unit judges whether to discharge overvoltage and output a first state signal according to the sampling voltage, the current monitoring and shunting unit judges whether to shunt overcurrent and output a second state signal according to the sampling current, and the monitoring and outputting unit outputs an overcharge state signal according to the first state signal or the second state signal. The invention also provides electronic equipment. The charging circuit and the electronic equipment judge whether the charging circuit is in the over-charging state or not by monitoring the discharge module, discharge overvoltage or shunt overcurrent in time when the charging circuit is in the over-charging state, avoid over-charging of the battery and improve the safety of the circuit.
Description
Technical Field
The present invention relates to the field of charging control technologies, and in particular, to a charging circuit and an electronic device.
Background
At present, lithium batteries are popular due to the characteristics of high energy, light weight, low natural discharge rate and the like, and are widely applied to electronic equipment such as mobile phones, notebook computers and the like.
Fig. 1 is a power supply circuit architecture of a current stage electronic device. In the framework, the charging interface is used for detecting whether the charger is inserted into the electronic device such as a mobile phone or not and informing the processor that the charger is inserted and can be charged; a charge control circuit (not shown) within the charge control chip is ready to be controlled when the battery is low; the charging control chip may further include a power detection circuit (not shown) for detecting the power of the battery and sending a signal power to the processor in time.
However, the charging architecture of the battery charging circuit still has defects, so that mobile phone explosion events caused by the battery occur every year. Through analysis, the causes of battery explosion are generally as follows: 1. a battery external short circuit; 2. the battery is overcharged for a long time; 3. the battery is internally short-circuited. The invention mainly aims to solve the problem of how to prevent the overcharge of the battery.
Disclosure of Invention
In view of the above, the present invention is directed to a charging circuit, which is improved on the charging structure of the existing battery charging circuit to solve the problem of how to prevent the battery from being overcharged.
Specifically, the embodiment of the invention provides a charging circuit, which comprises a charging control chip and a monitoring bleeder module, wherein the charging control chip stops charging a battery according to an overcharge state signal output by the monitoring bleeder module, and the monitoring bleeder module comprises a voltage monitoring bleeder unit, a current monitoring shunt unit and a monitoring output unit; the voltage monitoring and discharging unit comprises a voltage monitoring end and an overvoltage state output end, the voltage monitoring and discharging unit is connected with the charging output end of the charging control chip through the voltage monitoring end to obtain a sampling voltage, judges whether the charging is performed in an overvoltage mode according to the sampling voltage, discharges the overvoltage when the charging is judged to be in the overvoltage mode, and outputs a first state signal through the overvoltage state output end; the current monitoring and shunting unit comprises a current monitoring end and an overcurrent state output end, the current monitoring and shunting unit is connected with the current output end of the battery through the current monitoring end to obtain a sampling current, whether overcurrent charging is carried out or not is judged according to the sampling current, and when overcurrent charging is judged, overcurrent is shunted and a second state signal is output through the overcurrent state output end; the monitoring output unit comprises a first signal input end, a second signal input end and an overcharge state output end, the first signal input end of the monitoring output unit is connected with the overvoltage state output end of the voltage monitoring bleeder unit, and the second signal input end of the monitoring output unit is connected with the overcurrent state output end of the current monitoring shunt unit; when the first signal input end receives the first state signal or the second signal input end receives the second state signal, the overcharge state output end of the monitoring output unit outputs the overcharge state signal.
Further, the charging control chip comprises an electric quantity detection circuit, and at least one of the voltage monitoring bleeder unit and the current monitoring shunt unit is connected with the electric quantity detection circuit.
Further, the monitoring bleeder module further comprises a first voltage-dividing resistor, a second voltage-dividing resistor and a bleeder resistor; the first end of the first divider resistor is connected with the charging output end of the charging control chip, and the second end of the first divider resistor is connected with the voltage monitoring end of the voltage monitoring bleeder unit; the first end of the second voltage-dividing resistor is connected with the second end of the first voltage-dividing resistor, and the second end of the second voltage-dividing resistor is grounded; the first end of the bleeder resistor is connected with the bleeder end of the voltage monitoring bleeder unit, and the second end of the bleeder resistor is grounded.
Further, the monitoring bleeder module further comprises a current detection resistor, a first end of the current detection resistor is connected with the current output end of the battery and also connected with a current monitoring end of the current monitoring shunting unit, and a second end of the current detection resistor is grounded.
Further, a switch module is arranged between the charging control chip and the battery, a charging output end of the charging control chip is connected with a voltage input end of the switch module, an overcharge control output end of the charging control chip is connected with a control input end of the switch module, and a voltage output end of the switch module is connected with a charging end of the battery.
Further, the switch module includes a first switch resistance, a first switch element, a second switch resistance, and a second switch element; the first end of the first switch resistor is a control input end of the switch module; the first switch element comprises a first control end, a first path end and a second path end, the first control end of the first switch element is connected with the second end of the first switch resistor, and the second path end of the first switch element is grounded; a first end of the second switch resistor is connected with a first pass end of the first switch element, and a second end of the second switch resistor receives a reference high voltage; the second switch element comprises a second control end, a third path end and a fourth path end, the second control end of the second switch element is connected with the first path end of the first switch element, the third path end of the second switch element is the voltage output end of the switch module, and the fourth path end of the second switch element is the voltage input end of the switch module.
Further, the first switching element and the second switching element are both NPN-type triodes.
The embodiment of the invention also provides electronic equipment which comprises the charging circuit.
Further, the electronic device comprises a processor, and the overcharge prompt output end of the charge control chip is connected with the overcharge prompt input end of the processor.
Further, the electronic device includes an alarm module, and the processor is connected to the alarm module.
According to the charging circuit and the electronic equipment, whether the charging circuit is in the over-charging state or not is judged by monitoring the discharge module, and overvoltage or shunt overcurrent is timely discharged in the over-charging state, so that over-charging of a battery is avoided, and the safety of the circuit is improved.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a power circuit architecture of a current stage electronic device.
Fig. 2 is a schematic circuit structure diagram of a charging circuit according to a first embodiment of the present invention.
Fig. 3 is a circuit connection diagram of a charge detection module according to a first embodiment of the present invention.
Fig. 4 is a circuit connection diagram of a charge detection module according to a second embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the intended purpose, the following detailed description is given for embodiments, methods, steps, structures, features and effects of the charging circuit and the electronic device according to the present invention with reference to the accompanying drawings and preferred embodiments.
The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings. While the invention has been described in connection with specific embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.
First embodiment
Fig. 2 is a schematic circuit structure diagram of a charging circuit according to a first embodiment of the present invention. Fig. 3 is a circuit connection diagram of a charge detection module according to a first embodiment of the present invention. Referring to fig. 2 and fig. 3, the charging circuit of the present embodiment includes a charging control chip 100 and a monitoring bleeder module 200, wherein the charging control chip 100 receives an external power voltage to convert the external power voltage into a charging voltage Vin for charging the battery 300, and is further connected to the monitoring bleeder module 200 and the battery 300, respectively. The charging control chip 100 stops charging the battery 300 according to the overcharge state signal output by the monitoring bleeder module 200. The monitoring bleeding module 200 includes a voltage monitoring bleeding unit 210, a current monitoring shunting unit 220, and a monitoring output unit 230. The voltage monitoring and discharging unit 210 includes a voltage monitoring terminal 211 and an overvoltage output terminal 212, and the voltage monitoring and discharging unit 210 is connected to the charging output terminal 101 of the charging control chip 100 through the voltage monitoring terminal 211 to obtain a sampling voltage, and determines whether to perform overvoltage charging according to the sampling voltage, and when it is determined that the overvoltage charging is performed, discharges the overvoltage and outputs a first state signal through the overvoltage output terminal 212. The current monitoring and shunting unit 220 comprises a current monitoring end 221 and an overcurrent state output end 222, the current monitoring and shunting unit 220 is connected with the current output end 302 of the battery 300 through the current monitoring end 221 to obtain a sampling current, judges whether overcurrent charging is performed or not according to the sampling current, shunts overcurrent when overcurrent charging is judged, and outputs a second state signal through the overcurrent state output end 222. The monitoring output unit 230 comprises a first signal input end 231, a second signal input end 232 and an overcharge state output end 233, the first signal input end 231 of the monitoring output unit 230 is connected with the overvoltage state output end 212 of the voltage monitoring bleeder unit 210, and the second signal input end 232 of the monitoring output unit 230 is connected with the overcurrent state output end 222 of the current monitoring bleeder unit 220; when the first signal input terminal 231 of the monitoring output unit 230 receives the first status signal, or when the second signal input terminal 232 receives the second status signal, the overcharge state output terminal 233 of the monitoring output unit 230 outputs the overcharge state signal Vref.
In an embodiment, the charging control chip 100 may include a power detection circuit, and at least one of the voltage monitoring bleeder unit 210 and the current monitoring bleeder unit 220 is connected to the power detection circuit.
In one embodiment, the monitoring bleed-off module 200 further includes a first voltage dividing resistor R1, a second voltage dividing resistor R2, and a bleed-off resistor R3; a first end of the first voltage-dividing resistor R1 is connected to the charging output end 101 of the charging control chip 100, and a second end of the first voltage-dividing resistor R1 is connected to the voltage monitoring end 211 of the voltage monitoring bleeder unit 210; a first end of the second divider resistor R2 is connected with a second end of the first divider resistor R1, and a second end of the second divider resistor R2 is grounded; a first end of the bleeder resistor R3 is connected to the bleeder end 213 of the voltage monitoring bleeder unit 210, and a second end of the bleeder resistor R3 is grounded.
In an embodiment, the monitoring bleeder module 200 may further comprise a current detection resistor R4, a first terminal of the current detection resistor R4 is connected to the current output terminal 302 of the battery 300, and a second terminal of the current detection resistor R4 is connected to ground.
Specifically, the monitoring bleeder module 200 includes a voltage monitoring bleeder unit 210, a current monitoring shunt unit 220 and a monitoring output unit 230, and is configured to monitor whether the monitoring bleeder module is in the overcharge state, and when the monitoring bleeder module 200 monitors the overcharge state, the monitoring bleeder module 200 outputs an overcharge state signal Vref to the charging control chip 100, and the charging control chip 100 stops charging the battery according to the overcharge state signal Vref.
For example, in fig. 3, a first end of the first voltage dividing resistor R1 is connected to the charging output terminal 101 of the charging control chip 100, and a second end of the first voltage dividing resistor R1 is connected to the voltage monitoring terminal 211 of the voltage monitoring bleeder unit 210; a first end of the second divider resistor R2 is connected with a second end of the first divider resistor R1, and a second end of the second divider resistor R2 is grounded; the first end of the bleeder resistor R3 is connected to the bleeder terminal 213 of the voltage monitoring bleeder unit 210, the second end of the bleeder resistor R3 is grounded, the voltage monitoring terminal 211 of the voltage monitoring bleeder unit 210 can perform resistor voltage division on the charging voltage Vin at the charging output terminal 101 of the charging control chip 100 through the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 which are connected in series to obtain a sampling voltage, the voltage monitoring bleeder unit 210 determines whether to perform over-voltage charging according to the sampling voltage, and when the over-voltage charging is determined, bleeds over-voltage and outputs a first state signal through the over-voltage state output terminal 212.
For example, in fig. 3, a first end of the current detection resistor R4 is connected to the current output end 302 of the battery 300 and is also connected to the current monitoring end 221 of the current monitoring shunt unit 220, and a second end of the current detection resistor R4 is grounded, so that the current monitoring end 221 of the current monitoring shunt unit 220 can obtain the sampled current at the first end of the current detection resistor R4. However, the present invention is not limited to the embodiment shown in fig. 3, the current output end 302 of the battery 300 may also be the charging end 301 of the battery 300, the current detection resistor R4 may be correspondingly disposed between the charging output end 101 of the charging control chip 100 and the charging end 301 of the battery 300, a sampling current is calculated by collecting a voltage difference value between two ends of the current detection resistor R4, the current monitoring and shunting unit 220 determines whether to perform over-current charging according to the sampling current, and shunts over-current when determining that the over-current charging is performed, and outputs the second state signal through the over-current state output end 222.
A first signal input end 231 of the monitoring output unit 230 is connected to the overvoltage output end 212 of the voltage monitoring bleeder unit 210, and a second signal input end 232 of the monitoring output unit 230 is connected to the overcurrent output end 222 of the current monitoring shunting unit 220; when the first signal input terminal 231 of the monitoring output unit 230 receives the first status signal, or when the second signal input terminal 232 of the monitoring output unit 230 receives the second status signal, the overcharge state output terminal 233 of the monitoring output unit 230 outputs an overcharge state signal Vref for determining the overcharge state, where the overcharge state signal Vref may be, but is not limited to, a high level signal.
In one embodiment, the monitoring output unit 230 may be an or operation unit, the first signal input terminal 231 may be a first operation input terminal of the or operation unit, the second signal input terminal 232 may be a second operation input terminal of the or operation unit, and the overcharge state output terminal 233 may be an operation output terminal of the or operation unit.
In the charging process, when the charging state is normal, the sampling voltage received by the voltage monitoring terminal 211 of the voltage monitoring bleeder unit 210 is the resistance voltage division of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, the voltage monitoring bleeder unit 210 determines whether the charging is overvoltage charging after determining according to the sampling voltage, for example, a comparison unit determines that the sampling voltage is smaller than a voltage threshold, the charging is determined not to be overvoltage charging, and the overvoltage output terminal 212 of the voltage monitoring bleeder unit 210 does not output the first state signal. The sampling current received by the current monitoring terminal 221 of the current monitoring shunt unit 220 is the current at the first terminal of the current detection resistor R4, the current monitoring shunt unit 220 determines whether the current is over-current charging after determining according to the sampling current, for example, if a comparison unit determines that the sampling current is smaller than a current threshold, it is determined that the current is over-current charging, and the over-current state output terminal 222 of the current monitoring shunt unit 220 does not output the second state signal. If the first signal input terminal 231 of the monitoring output unit 230 does not receive the first status signal and the second signal input terminal 232 does not receive the second status signal, the overcharge status output terminal 233 of the monitoring output unit 230 does not output the overcharge status signal Vref. If the overcharge control chip 100 does not receive the overcharge state signal Vref, the battery 300 is kept charged.
In the charging process, when the voltage is overcharged, the sampled voltage received by the voltage monitoring terminal 211 of the voltage monitoring bleeder unit 210 is the resistance voltage division of the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2, the voltage monitoring bleeder unit 210 determines that the voltage is overcharged after determining according to the sampled voltage, for example, if a comparison unit determines that the sampled voltage is greater than a voltage threshold value, the voltage is overcharged, and the voltage monitoring bleeder unit 210 bleeds the overvoltage and outputs a first state signal through the overvoltage state output terminal 212. When the current is overcharged, the sampling current received by the current monitoring terminal 221 of the current monitoring shunting unit 220 is the current at the first terminal of the current detection resistor R4, the current monitoring shunting unit 220 determines that the current is overcharged after determining according to the sampling current, for example, if a comparison unit determines that the sampling current is greater than a current threshold, the current monitoring shunting unit 220 determines that the current is overcharged, and shunts the overcurrent and outputs a second state signal through the overcurrent state output terminal 222. Therefore, when the charging is in the overcharge state, the first signal input terminal 231 of the monitoring output unit 230 receives the first state signal and/or the second signal input terminal 232 receives the second state signal, and the monitoring output unit 230 may output the overcharge state signal Vref at the overcharge state output terminal 233 according to the first signal input terminal 231 of the monitoring output unit or the second signal input terminal 232 of the monitoring output unit receives the second state signal. When the charging control chip 100 receives the overcharge state signal Vref, the charging of the battery 300 is stopped, and specifically, the charging control chip 100 may stop receiving the external power voltage at the power input terminal, or may stop outputting the charging voltage Vin at the charging output terminal 101, so that the overcharge of the battery 300 is avoided, and the safety of the circuit is improved.
Furthermore, the charging control chip 100 may include a power detection circuit, and at least one of the voltage monitoring bleeder unit 210 and the current monitoring bleeder unit 220 is connected to the power detection circuit, so that the corresponding charging stage of the battery 300 can be determined according to the battery power, and the accurate determination of the over-voltage charging and/or the over-current charging can be realized. Specifically, the charging process of the present stage battery 300 can be divided into four stages: 1. trickle charge (low-voltage precharge) stage: the voltage of the battery 300 to be charged is detected, and if the voltage of the battery 300 to be charged is lower than 3V, pre-charging is performed, the charging current is 1/10 of the set current, until the voltage of the battery 300 to be charged rises to 3V. 2. And (3) a constant current charging stage: and entering a standard charging process to perform constant current charging at a set current until the voltage of the battery 300 to be charged rises to 4.20V. 3. A constant-voltage charging stage: the charging voltage Vin is kept at 4.20V, and the charging current gradually decreases. 4. And a charging termination stage: when the charging current drops to 1/10, which is the set charging current, the charging ends. The charging control chip 100 may include an electric quantity detection circuit for detecting the electric quantity of the battery, and the voltage monitoring bleeder unit 210 of the charging detection module 200 is connected to the electric quantity detection circuit, so that the voltage monitoring bleeder unit 210 obtains a voltage threshold corresponding to a charging stage in which the battery 300 is charged, and the voltage monitoring bleeder unit 210 may accurately determine whether to perform over-voltage charging according to the sampling voltage and the voltage threshold, for example, when the charging control chip is determined to be a trickle charging (low-voltage pre-charging) stage according to the electric quantity, the voltage threshold corresponds to 3V; when the constant current charging stage is determined according to the electric quantity, the voltage threshold value corresponds to 4.2V; when the constant voltage charging stage and the charging termination stage are determined according to the electric quantity, the voltage threshold value corresponds to 4.2V, and the like. Meanwhile, the current monitoring shunt unit 220 of the charging detection module 200 is connected to the electric quantity detection circuit, so that the current monitoring shunt unit 220 obtains a current threshold corresponding to a charging stage where the battery 300 is charged, and the current monitoring shunt unit 220 can accurately determine whether over-current charging is performed according to the sampling current and the current threshold, for example, when the battery is determined to be in a trickle charging (low-voltage pre-charging) stage according to the electric quantity, the current threshold corresponds to 1/10 of the set current; when the constant current charging stage is determined according to the electric quantity, the current threshold corresponds to the set current; when the constant-voltage charging stage is determined according to the electric quantity, the current threshold corresponds to the set current; when the charge amount is determined as the charge termination period, the current threshold value corresponds to 1/10 of the set current, and so on.
Therefore, the charging circuit can determine the corresponding charging stage of the battery according to the magnitude of the electric quantity of the battery, so that the voltage monitoring bleeder unit 210 of the monitoring bleeder module 200 can more accurately determine the over-voltage charging, and/or the current monitoring shunting unit 220 can more accurately determine the over-current charging, and can discharge the over-voltage during the over-voltage charging and/or shunt the over-current during the over-current charging, so that the monitoring output unit 230 outputs an over-charge state signal Vref to the charging control chip 100, and the charging control chip 100 stops the over-charging of the battery 300.
The charging circuit provided by the embodiment judges whether the charging circuit is in an overcharge state or not by monitoring the discharge module 200, and timely discharges overvoltage or shunt overcurrent in the overcharge state, thereby avoiding overcharge of the battery 300 and improving the safety of the circuit.
Second embodiment
Fig. 4 is a circuit connection diagram of a charge detection module according to a second embodiment of the present invention. This embodiment is substantially the same as the first embodiment except that: a switch module 400 is arranged between the charging control chip 100 and the battery 300, the charging output terminal 101 of the charging control chip 100 is connected with a voltage input terminal 401 of the switch module 400, the overcharge control output terminal 102 of the charging control chip 100 is connected with a control input terminal 402 of the switch module 400, and a voltage output terminal 403 of the switch module 400 is connected with a charging terminal 301 of the battery 300.
In one embodiment, the switch module 400 includes: a first switching resistor R5, a first switching element T1, a second switching resistor R6 and a second switching element T2. A first terminal of the first switch resistor R5 is a control input terminal 402 of the switch module 400. The first switching element T1 includes a first control terminal, a first path terminal and a second path terminal, the first control terminal of the first switching element T1 is connected to the second terminal of the first switching resistor R5, and the second path terminal of the first switching element T1 is grounded. A first terminal of the second switching resistor R6 is connected to the first path terminal of the first switching element T1, and a second terminal of the second switching resistor R6 receives the reference high voltage Vcc. The second switching element T2 includes a second control terminal, a third path terminal and a fourth path terminal, the second control terminal of the second switching element T2 is connected to the first path terminal of the first switching element T1, the third path terminal of the second switching element T2 is the voltage output terminal 403 of the switching module 400, i.e., connected to the charging input terminal of the battery 300, and the fourth path terminal of the second switching element T2 is the voltage input terminal 401 of the switching module 400, i.e., connected to the charging output terminal 101 of the charging control chip 100.
In an embodiment, the first switching element T1 and the second switching element T2 may be, but are not limited to, NPN transistors, and may also be transistors of other types, such as NMOS transistors, etc.
Specifically, the charging output terminal 101 of the charging control chip 100 of the present embodiment outputs the charging voltage Vin to the voltage input terminal 401 of the switch module 400, the overcharge control output terminal 102 of the charging control chip 100 is connected to the control input terminal 402 of the switch module 400, and the voltage output terminal 403 of the switch module 400 is connected to the charging terminal 301 of the battery 300, so that the switch module 400 controls whether the charging output terminal 101 of the charging control chip 100 and the charging terminal 301 of the battery 300 are disconnected according to whether the control input terminal 402 receives the charging stop signal Ven. The charging stop signal Ven may be, but is not limited to, a high level signal, and the high level signal is described as an example below.
In a normal charging state, the charging control chip 100 may not output the overcharge state signal Vref according to the monitoring of the bleeder module 200, and does not output the charging stop signal Ven at the overcharge control output terminal 102, so that the first control terminal of the first switch element T1 cannot receive the charging stop signal Ven through the first switch resistor R5, and is at a low level, the first switch circuit is in an off state, and the first control terminal of the second switch element T2 receives the reference high voltage Vcc through the second switch resistor R6 and is at a high level, so that the second switch element T2 is in an on state, that is, the third terminal and the fourth terminal are turned on, and the battery 300 continues to be charged.
In the overcharged state, the charging control chip 100 may output the charging stop signal Ven at the overcharge control output terminal 102 according to the overcharge state signal Vref, and then the first control terminal of the first switch element T1 receives the charging stop signal Ven through the first switch resistor R5 and is at a high level, and then the first switch circuit is in a conducting state, and the first control terminal of the second switch element T2 is grounded through the conducting first switch circuit, so that the second switch element T2 is in a disconnecting state, that is, the third path terminal and the fourth path terminal are disconnected, and then the charging control chip 100 is disconnected from the battery 300 through the switch module 400, and the charging control chip 100 cannot charge the battery 300, thereby avoiding overcharging the battery 300, and improving the safety of the circuit.
The charging circuit provided by the embodiment determines whether the charging circuit is in an overcharge state by monitoring the discharging module 200, and timely discharges overvoltage or shunt overcurrent when the charging circuit is in the overcharge state, and the charging control chip 100 is disconnected from the battery 300 by controlling the switch module 400, so that overcharge to the battery 300 is avoided, and the safety of the circuit is improved.
Third embodiment
The present embodiment provides an electronic device, which includes the charging circuit of the above embodiment.
In one embodiment, the electronic device includes a processor, and the overcharge prompt output terminal of the charge control chip 100 is connected to the overcharge prompt input terminal of the processor. In one embodiment, the electronic device includes an alarm module, and the processor is coupled to the alarm module.
Specifically, the electronic device of this embodiment may be any electronic product or device such as a mobile phone, a tablet computer, a notebook computer, a netbook, a game console, a television, a VCD, a DVD, a navigator, a camera, a video camera, a recording pen, an MP3, an MP4, a PSP, and may also be any intermediate product including the charging circuit. Taking the electronic device as a mobile phone as an example, the charging control chip 100 of the charging circuit can receive an external power through a charging interface, and can be connected to the processor and the power control chip respectively. By monitoring the switch module 400 of the bleeder module 200 and the bleeder module 200, it is determined whether to perform over-voltage charging or over-current charging, and the connection between the charging control chip 100 and the battery 300 is disconnected during over-charging, thereby avoiding over-charging of the battery 300. When the overcharge monitoring input end of the charge control chip 100 receives the overcharge state signal output by the monitoring bleeder module 200, the charge control chip 100 sends a corresponding prompt signal to the processor, so that the processor performs corresponding program control, for example, the processor may control the connected alarm module to perform alarm, such as LED lighting or buzzer sounding, etc.
The electronic device of the embodiment determines whether to overcharge through the monitoring discharge module 200 of the charging circuit, and timely discharges overvoltage or shunt overcurrent in the overcharge state, thereby avoiding overcharge of the battery 300 and improving the safety of the circuit.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A charging circuit comprising a charging control chip (100) and a monitoring bleeder module (200), the charging control chip (100) stopping charging a battery (300) according to an overcharge state signal output by the monitoring bleeder module (200), the monitoring bleeder module (200) comprising:
the voltage monitoring and discharging unit (210) comprises a voltage monitoring end (211) and an overvoltage state output end (212), the voltage monitoring and discharging unit (210) is connected with the charging output end (101) of the charging control chip (100) through the voltage monitoring end (211) to obtain a sampling voltage, whether overvoltage charging is carried out or not is judged according to the sampling voltage, when overvoltage charging is judged, overvoltage is discharged, and a first state signal is output through the overvoltage state output end (212);
the current monitoring and shunting unit (220), the current monitoring and shunting unit (220) comprises a current monitoring end (221) and an overcurrent state output end (222), the current monitoring and shunting unit (220) is connected with the current output end (302) of the battery (300) through the current monitoring end (221) to obtain a sampling current, whether overcurrent charging is carried out or not is judged according to the sampling current, and when overcurrent charging is judged, overcurrent is shunted and a second state signal is output through the overcurrent state output end (222);
the monitoring output unit (230) comprises a first signal input end (231), a second signal input end (232) and an overcharge state output end (233), the first signal input end (231) is connected with the overvoltage state output end (212) of the voltage monitoring bleeder unit (210), and the second signal input end (232) is connected with the overcurrent state output end (222) of the current monitoring bleeder unit (220); when the first signal input end (231) receives the first state signal or when the second signal input end (232) receives the second state signal, the overcharge state output end (233) of the monitoring output unit (230) outputs the overcharge state signal;
the charging control chip (100) comprises a power detection circuit, and at least one of the voltage monitoring bleeder unit (210) and the current monitoring shunt unit (220) is connected with the power detection circuit.
2. The charging circuit of claim 1, wherein the monitoring bleeding module (200) further comprises:
a first voltage-dividing resistor (R1), wherein a first end of the first voltage-dividing resistor (R1) is connected with a charging output end (101) of the charging control chip (100), and a second end of the first voltage-dividing resistor (R1) is connected with a voltage monitoring end (211) of the voltage monitoring bleeder unit (210);
a second divider resistor (R2), a first terminal of the second divider resistor (R2) being connected to a second terminal of the first divider resistor (R1), a second terminal of the second divider resistor (R2) being connected to ground;
a bleeder resistor (R3), a first end of the bleeder resistor (R3) is connected with a bleeder end (213) of the voltage monitoring bleeder unit (210), and a second end of the bleeder resistor (R3) is grounded.
3. The charging circuit of claim 1, wherein the monitoring bleeding module (200) further comprises:
the first end of the current detection resistor (R4) is connected with the current output end (302) of the battery (300), the first end of the current detection resistor (R4) is also connected with the current monitoring end (221) of the current monitoring shunting unit (220), and the second end of the current detection resistor (R4) is grounded.
4. A charging circuit according to claim 1, characterized in that a switch module (400) is arranged between the charging control chip (100) and the battery (300), the charging output terminal (101) of the charging control chip (100) is connected to a voltage input terminal (401) of the switch module (400), the overcharge control output terminal (102) of the charging control chip (100) is connected to a control input terminal (402) of the switch module (400), and the voltage output terminal (403) of the switch module (400) is connected to the charging terminal (301) of the battery (300).
5. A charging circuit according to claim 4, characterized in that the switching module (400) comprises:
a first switching resistor (R5), a first terminal of the first switching resistor (R5) being a control input (402) of the switching module (400);
a first switching element (T1), the first switching element (T1) including a first control terminal, a first path terminal and a second path terminal, the first control terminal of the first switching element (T1) being connected to the second terminal of the first switching resistor (R5), the second path terminal of the first switching element (T1) being grounded;
a second switching resistor (R6), a first terminal of the second switching resistor (R6) being connected to the first path terminal of the first switching element (T1), a second terminal of the second switching resistor (R6) receiving a reference high voltage;
a second switching element (T2), the second switching element (T2) comprising a second control terminal, a third pass terminal and a fourth pass terminal, the second control terminal of the second switching element (T2) being connected to the first pass terminal of the first switching element (T1), the third pass terminal of the second switching element (T2) being the voltage output terminal (403) of the switching module (400), the fourth pass terminal of the second switching element (T2) being the voltage input terminal (401) of the switching module (400).
6. The charging circuit of claim 5, wherein the first switching element (T1) and the second switching element (T2) are both NPN transistors.
7. An electronic device comprising the charging circuit according to any one of claims 1 to 6.
8. An electronic device as claimed in claim 7, characterized in that the electronic device comprises a processor, and the overcharge alert output of the charge control chip (100) is connected to the overcharge alert input of the processor.
9. The electronic device of claim 8, comprising an alarm module, the processor coupled to the alarm module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811593129.2A CN109638918B (en) | 2018-12-25 | 2018-12-25 | Charging circuit and electronic equipment |
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| CN201811593129.2A CN109638918B (en) | 2018-12-25 | 2018-12-25 | Charging circuit and electronic equipment |
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| CN111864818B (en) * | 2019-04-28 | 2022-06-14 | Oppo广东移动通信有限公司 | Charging control circuit, charging control method, charging receiving circuit and split type electronic equipment |
| CN112928788A (en) * | 2019-12-06 | 2021-06-08 | 北京小米移动软件有限公司 | Charging signal amplification structure, electronic device, and charging control method |
| CN112737055B (en) * | 2021-01-13 | 2022-11-01 | 南昌嘉信高科技有限公司 | Charging protection circuit and electronic equipment |
| CN112952223B (en) * | 2021-03-17 | 2022-08-30 | 深圳市安仕新能源科技有限公司 | Battery charging method and device and battery management system |
| CN114069805B (en) * | 2022-01-17 | 2022-04-22 | 深圳市微源半导体股份有限公司 | Overcharge protection circuit, power supply circuit and electronic equipment |
| CN114726061B (en) * | 2022-06-01 | 2022-08-16 | 深圳市菲尼基科技有限公司 | Control system for lithium battery power management |
| CN117543783A (en) * | 2024-01-10 | 2024-02-09 | 荣耀终端有限公司 | Charging circuit, electronic device, and charging control method |
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| JPH10112939A (en) * | 1996-10-07 | 1998-04-28 | Nec Corp | Power switching circuit |
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| CN104348214B (en) * | 2013-08-09 | 2019-04-12 | 惠州市吉瑞科技有限公司 | Charger and its guard method with over-voltage over-current protection |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant before: Kunshan Longteng Optronics Co., Ltd. |
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