CN111835048A - Charging and discharging switching circuit and electronic equipment - Google Patents
Charging and discharging switching circuit and electronic equipment Download PDFInfo
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- CN111835048A CN111835048A CN201910323662.5A CN201910323662A CN111835048A CN 111835048 A CN111835048 A CN 111835048A CN 201910323662 A CN201910323662 A CN 201910323662A CN 111835048 A CN111835048 A CN 111835048A
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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Abstract
The invention provides a charge-discharge switching circuit and electronic equipment, wherein the charge-discharge switching circuit comprises a controller and a charge-discharge management module; the charging and discharging management module and the controller are used for collecting charging power supply voltage and generating a control signal according to the charging power supply voltage and battery voltage; the controller is used for controlling the charging power supply to charge the battery when the control signal is the first signal, and the charging and discharging management module controls the battery to supply power to the load when the control signal is the second signal. According to the technical scheme, the charge and discharge switching is realized through the generated control signal, and the use convenience is improved.
Description
Technical Field
The invention relates to the technical field of charging, in particular to a charging and discharging switching circuit and electronic equipment.
Background
When the conventional electronic equipment with a single lithium battery is used for charging the lithium battery by using an external power supply, only a constant-current charging mode can be realized, the load cannot be automatically supplied after the charging is finished or the charging power supply is disconnected, and the load needs to be manually supplied with power after the load is manually reset.
Therefore, the prior art has the problem that the charging and discharging can not be automatically switched.
Disclosure of Invention
In view of the above problems, the present invention has been made to solve the above problems or at least partially solve the above problems.
An embodiment of the present invention provides a charge/discharge switching circuit, including: the controller and the charging and discharging management module; the charging and discharging management module and the controller are used for collecting charging power supply voltage and generating a control signal according to the charging power supply voltage and battery voltage;
the controller is used for controlling the charging power supply to charge the battery when the control signal is a first signal; and the charging and discharging management module controls the battery to supply power to the load when the control signal is the second signal.
Preferably, the charge and discharge switching circuit further includes the first protection module; the first protection module is used for collecting the port voltage of the battery, and cutting off the connection between the battery and the post-stage circuit when the port voltage of the battery exceeds a first preset voltage threshold value.
Preferably, the charge-discharge switching circuit further comprises a second protection module, wherein the second protection module is used for collecting a port voltage of the battery, and cutting off the connection between the battery and the post-stage circuit when the port voltage of the battery exceeds a second preset voltage threshold value when the battery is charged or the battery supplies power to a load; the second preset voltage threshold is greater than the first preset voltage threshold.
Preferably, the first protection module comprises a primary protection chip, a primary acquisition circuit, a discharge MOS transistor and a charge MOS transistor; wherein
The first end of the primary acquisition circuit is connected with a battery, the second end of the primary acquisition circuit is connected with the battery, and the output end of the primary acquisition circuit is connected with the data acquisition end of the primary protection chip; the input end of the discharge MOS tube is connected with the second end of the primary acquisition circuit, the output end of the discharge MOS tube is connected with the input end of the charge MOS tube, and the controlled end of the discharge MOS tube is connected with the discharge control end of the primary protection chip; the controlled end of the charging MOS tube is connected with the charging control end of the primary protection chip, and the output end of the charging MOS tube is connected with the input end of the discharging MOS tube of the charging and discharging terminal of the second protection module.
Preferably, the charge-discharge switching circuit further includes a charge-discharge terminal, and the charge-discharge terminal is connected to the controller and the charge-discharge management module respectively;
when the charging and discharging terminal is connected with a charging power supply, the charging and discharging management module stops working, and the controller starts working to charge the battery;
when the charging and discharging terminal is disconnected with the charging power supply, the charging and discharging management module starts to work, and the controller is bypassed, so that the battery supplies power to the load.
Preferably, the charge and discharge management module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a voltage comparator and a first MOS transistor; wherein
The first end of the first resistor is connected with the charge-discharge terminal, the second end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is grounded; the first end of the second resistor is connected with the charge and discharge terminal, and the second end of the second resistor is connected with the grid electrode of the first MOS tube; the first end of the third resistor is connected with the output end of the voltage comparator, and the second end of the third resistor is connected with the grid electrode of the first MOS tube; a first end of the fourth resistor is connected with the charge and discharge terminal, and a second end of the fourth resistor is connected with a non-inverting input end of the voltage comparator; the first end of the fifth resistor is connected with the anode of the battery, and the second end of the fifth resistor is connected with the inverting input end of the voltage comparator; the source electrode of the first MOS tube is connected with the charge-discharge terminal, and the drain end of the first MOS tube is connected with the battery.
Preferably, the charge-discharge switching circuit further includes a second capacitor, a third capacitor, and a fourth capacitor;
a first end of the second capacitor is connected with a second end of the fourth resistor, and a second end of the second capacitor is connected with a second end of the fifth resistor; the first end of the third capacitor is connected with the second end of the fourth resistor, and the second end of the third capacitor is grounded; and the first end of the fourth capacitor is connected with the second end of the fifth resistor, and the second end of the fourth capacitor is grounded.
Preferably, the charge-discharge switching circuit further comprises an anti-static protection circuit, the anti-static protection circuit is connected with the controller and the charge-discharge management module respectively, and the anti-static protection circuit is further connected with the charge-discharge terminal.
Preferably, the charge and discharge switching circuit further comprises a filter circuit, the filter circuit is connected with the charge and discharge terminal, and the filter circuit is further connected with the battery.
The invention also provides electronic equipment which comprises a battery and the charge-discharge switching circuit.
According to the technical scheme provided by the embodiment of the invention, the charging and discharging switching circuit is formed by arranging the controller and the charging and discharging management module. The charging and discharging management module and the controller collect charging power supply voltage, generate a control signal according to the charging power supply voltage and the battery voltage, and control the charging power supply to charge the battery when the control signal is a first signal; and the charge and discharge management module controls the battery to supply power to the load when the control signal is the second signal. According to the technical scheme, the charging and discharging switching is realized through the generated control signal, and the use convenience is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a functional block diagram of a charge/discharge switching circuit according to an embodiment of the present invention;
fig. 2 is a circuit structure diagram of the charge and discharge management module in fig. 1.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
Furthermore, the term "coupled" is intended to include any direct or indirect coupling. Thus, if a first device couples to a second device, that connection may be through a direct connection, or through an indirect connection via other devices. The following description is of the preferred embodiment for carrying out the invention, and is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present invention is defined by the appended claims.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Example one
Fig. 1 is a functional block diagram of a charge/discharge switching circuit according to an embodiment of the present invention. Fig. 1 shows a charge/discharge switching circuit according to an embodiment of the present invention, which includes a controller 100 and a charge/discharge management module 200.
The charging and discharging management module 200 and the controller 100 are configured to collect a charging power voltage and generate a control signal according to the charging power voltage and a battery voltage. A controller 100 for controlling the charging power supply to charge the battery when the control signal is the first signal; and the charge and discharge management module 200 controls the battery to supply power to the load when the control signal is the second signal.
The controller 100 includes a DC-DC converter to reduce a DC voltage and convert a voltage at an input terminal of the charge/discharge terminal into a voltage required for charging the battery. The charge and discharge management module 200 also includes a DC-DC converter to convert the DC voltage and convert the voltage output by the battery into the voltage required by the load.
In this embodiment, the charging and discharging management module 200 and the controller 100 compare the charging power voltage and the battery voltage, and generate the control signal according to the comparison result. The control signal is a digital signal or an analog signal, and may be a difference voltage between the charging power supply voltage and the battery voltage, or a digital signal generated according to a comparison result between the charging power supply voltage and the battery voltage. Therefore, the first signal and the second signal may be a difference voltage signal or may be digital signals generated from a comparison result between the charging power supply voltage and the battery voltage.
The controller 100 and the charge and discharge management module 200 control the entire charge and discharge switching circuit to operate in the charge mode or the discharge mode according to the control signal.
When charging, constant current charging is firstly carried out, and when the electric quantity of the battery is charged to a preset threshold value, constant voltage charging is carried out instead until the electric quantity of the battery is fully charged. The embodiment of the invention forms a charging and discharging switching circuit by arranging the controller and the charging and discharging management module. The charging and discharging management module and the controller collect charging power supply voltage, generate a control signal according to the charging power supply voltage and the battery voltage, and control the charging power supply to charge the battery when the control signal is a first signal; and the charge and discharge management module is used for controlling the battery to supply power to the load when the control signal is the second signal. According to the technical scheme, the charging and discharging switching is realized through the generated control signal, and the use convenience is improved.
Further, the charge and discharge switching circuit may further include a first protection module 300; the first protection module 300 is configured to collect a port voltage of the battery, and when the battery is charged or the battery supplies power to a load, the connection between the battery and a subsequent circuit is cut off when the port voltage of the battery exceeds a first preset voltage threshold. Through setting up first protection module 300, improved the security of charge-discharge switching circuit for when battery port voltage was too big, in time stop the battery to charge or stop the battery discharge, avoid the voltage too high to cause the damage to the battery.
Further, the charge-discharge switching circuit may further include a second protection module 400, where the second protection module 400 is configured to collect a port voltage of the battery, and when the battery is charged or the battery supplies power to the load, and the port voltage of the battery exceeds a second preset voltage threshold, the connection between the battery and the subsequent circuit is cut off; the second preset voltage threshold is greater than the first preset voltage threshold.
In case of a certain battery capacity, the protection voltage threshold (i.e., the first preset voltage threshold) of the first protection module 300 is set to be lower than the normal value of the battery port voltage. In this embodiment, the first protection module 300 and the second protection module 400 are provided to form dual protection. For a battery with a low capacity, the purpose of the double protection is to start the protection action of the second protection module 400 after the first protection module 300 fails, so as to greatly improve the safety of the battery.
Specifically, the first protection module 300 includes a primary acquisition circuit 301, a primary protection chip 302, a discharge MOS transistor 303, and a charge MOS transistor 304; the first end of the primary acquisition circuit 301 is connected with the battery, the second end of the primary acquisition circuit 301 is connected with the battery, and the output end of the primary acquisition circuit 301 is connected with the data acquisition end of the primary protection chip 302; the input end of the discharge MOS tube 303 is connected with the second end of the primary acquisition circuit 301, the output end of the discharge MOS tube 303 is connected with the input end of the charge MOS tube 304, and the controlled end of the discharge MOS tube 303 is connected with the discharge control end of the primary protection chip 302; the controlled end of the charging MOS transistor 304 is connected to the charging control end of the primary protection chip 302, and the output end of the charging MOS transistor 304 is connected to the input end of the discharging MOS transistor 403 of the second protection module 400.
It should be noted that, when the primary protection chip 302 detects that the voltage at the battery port reaches the over-discharge protection condition, the discharge MOS transistor 303 is turned off. After the over-discharge protection, the primary protection chip 302 enters a sleep state. When a charging power supply enters the charging and discharging terminal, the primary protection chip 302 ends the dormant state, and the discharging MOS tube 303 is restored to the conducting state.
The second protection module 400 includes a secondary acquisition circuit 401, a secondary protection chip 402, a discharge MOS transistor 403, and a charge MOS transistor 404. The second protection module 400 is implemented in substantially the same principle as the first protection module 300. The overcharge point of the second protection module 400 is set higher than the overcharge point of the first protection module 300, and the overdischarge point of the second protection module 400 is set lower than the overdischarge point of the first protection module 300.
Further, the charge and discharge switching circuit further includes a charge and discharge terminal 500, and the charge and discharge terminal 500 is connected to the controller 100 and the charge and discharge management module 200, respectively. When the charging and discharging terminal 500 is connected to the charging power supply, the charging and discharging management module 200 stops working, and the controller 100 starts working to charge the battery; when the charge/discharge terminal 500 is disconnected from the charging power source, the charge/discharge management module 200 starts to operate, and the controller 100 is bypassed so that the battery supplies power to the load.
Fig. 2 is a circuit structure diagram of the charge and discharge management module in fig. 1. Specifically, referring to fig. 2, the charge and discharge management module 200 may include a first resistor R1, a second resistor R1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a voltage comparator U1, and a first MOS transistor Q1. A first end of the first resistor R1 is connected to the charge and discharge terminal 500, a second end of the first resistor R1 is connected to a first end of the first capacitor C1, and a second end of the first capacitor C1 is grounded; a first end of the second resistor R1 is connected to the charge and discharge terminal 500, and a second end of the second resistor R1 is connected to the gate of the first MOS transistor Q1; a first end of the third resistor R3 is connected with the output end of the voltage comparator U1, and a second end of the third resistor R3 is connected with the gate of the first MOS transistor Q1; a first end of the fourth resistor R4 is connected to the charge and discharge terminal 500, and a second end of the fourth resistor R4 is connected to a non-inverting input end of the voltage comparator U1; a first end of the fifth resistor R5 is connected with the positive electrode of the battery, and a second end of the fifth resistor R5 is connected with the inverting input end of the voltage comparator U1; the source of the first MOS transistor Q1 is connected to the charge/discharge terminal 500, and the drain of the first MOS transistor Q1 is connected to the battery.
When the charging power supply is removed or a load is connected, the MOS transistor in the charging and discharging management module 200 is turned on, the charging and discharging management module 200 is bypassed, and the charging and discharging terminal 500 outputs voltage from the battery.
B + is the battery anode, and P + is the port anode; b-is a battery cathode; p-is a port cathode; a first protection module 300 and a second protection module 400 are connected between B-and P-.
When a direct-current power supply is connected to a port of JP1, the voltage is more than or equal to 5V, P + > B +, and the highest voltage of B + does not exceed 4.3V, the output end of the voltage comparator U1 outputs a high-level signal, the value (voltage to B-) of the high-level signal is equal to P +, and the high-level signal is transmitted to the grid electrode of a first MOS transistor Q1; when Vgs of the first MOS transistor Q1 (P-channel MOS transistor) is 0, the first MOS transistor Q1 is always in an off state, P + serves as an external interface, and B + serves as a positive electrode of the battery. The switch of Q1 is controlled by the output voltage of the U1 comparator. That is, the charging and discharging management module 200 is in an off state, that is, P + and B + are not connected, the controller starts to operate, and the battery is in a charging state.
During charging, the voltage at two ends of the battery does not reach the highest voltage of the battery, and the battery enters a constant current charging mode; when the voltage across the battery reaches the maximum voltage of the battery, the battery enters a constant voltage charging mode, the charging current decreases, the charging current reaches a charging shutdown condition, the controller 100 shuts down the output, and the operation is stopped.
When the DC power supply of the JP1 port is removed, P < + > is less than or equal to B < + >, the output end of the U1 outputs a low level signal, and the value of the low level signal is equal to the ground B < - > of the voltage comparator U1; vgs <0 for P-channel MOS, Q1 is always on. That is, the charge and discharge management module 200 is in an on state (P + ═ B +), the controller 100 is bypassed, and the battery is in a discharge state.
Further, the charge/discharge switching circuit further includes a second capacitor C2, a third capacitor C3, and a fourth capacitor C4. A first end of the second capacitor C2 is connected with a second end of the fourth resistor R4, and a second end of the second capacitor C2 is connected with a second end of the fifth resistor R5; a first end of the third capacitor C3 is connected with a second end of the fourth resistor R4, and a second end of the third capacitor C3 is grounded; a first terminal of the fourth capacitor C4 is connected to the second terminal of the fifth resistor R5, and a second terminal of the fourth capacitor C4 is grounded. The second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are all used for filtering and stabilizing voltage.
Further, the charge and discharge switching circuit may further include an anti-static protection circuit 600, the anti-static protection circuit 600 is connected to the controller 100 and the charge and discharge management module 200, respectively, and the anti-static protection circuit 600 is further connected to the charge and discharge terminal 500.
In this embodiment, the anti-static protection circuit 600 includes an ESD diode. The ESD diode is connected in parallel to the inlet of the charge/discharge terminal 500, and due to the clamping characteristic of ESD, the electrostatic peak voltage is clamped within a specified range by the ESD diode during electrostatic discharge, thereby ensuring stable operation of the rear chip.
Further, the charge and discharge switching circuit may further include a filter circuit 700, the filter circuit 700 is connected to the charge and discharge terminal 500, and the filter circuit 700 is further connected to the battery. The filter circuit 700 stabilizes the voltage during charging or discharging of the battery, and improves the stability of the charge/discharge switching circuit during operation.
The charging and discharging switching circuit may further include a temperature sampling circuit 800, where the temperature sampling circuit 800 is configured to measure a surface temperature of the battery, and when the surface temperature of the battery is too high, the controller 100 and the DC-DC converter inside the charging and discharging management module stop working to control the battery to be disconnected from the post-stage circuit.
Example two
The present embodiment provides an electronic device, where the electronic device includes a battery and a charging/discharging switching circuit as provided in the first embodiment, and the specific structure of the charging/discharging switching circuit refers to the first embodiment.
Specifically, the electronic device may be an intelligent household electrical appliance, such as a floor sweeping robot, an air cleaning robot, a service robot, a housekeeper robot, a window cleaning robot, a dust collector, a cleaning machine, a blower, a clothes dryer, etc., and as long as the electronic device includes a battery, the battery needs to be repeatedly charged and discharged, and the charging and discharging switching circuit is used, or other wireless intelligent household electrical appliances can all use the charging and discharging switching circuit.
The application scenario of the charge/discharge switching circuit provided in the present application will be described below with reference to a specific application scenario to assist understanding.
Application scenario 1
When the wireless handheld dust collector needs to be charged, a charging and discharging terminal of the dust collector is connected with a charging power supply, a charging and discharging management module and a controller collect charging power supply voltage, the charging power supply voltage is compared with battery voltage of the dust collector, and the controller generates a control signal according to the charging power supply voltage and the battery voltage. When the charging and discharging terminal is connected with the charging power supply, the control signal generated by the controller is a first signal, and the controller controls the charging power supply to charge the battery. During the charging process, constant current charging is firstly carried out, and when the voltage of the battery exceeds a set voltage threshold value, constant voltage charging is changed until the electric quantity of the battery is fully charged. When the charging and discharging terminal is disconnected with the charging power supply, the charging and discharging terminal is connected with the load, the control signal generated by the charging and discharging management module is a second signal, and the charging and discharging management module controls the battery to supply power to the load. In the charging or discharging process, if the voltage of the battery port reaches the over-discharge protection condition, the first protection module starts protection, and when the first protection module fails, the second protection module starts protection to form double protection. This charge-discharge switching circuit still is provided with antistatic protection circuit, temperature sampling circuit etc. and in the face of complicated charge-discharge operating mode, can guarantee normal charge-discharge, effectively improves the reliability and the stability of dust catcher.
When charging is needed, a charging and discharging terminal of the cleaning machine is connected with a charging power supply, a charging and discharging management module and a controller collect charging power supply voltage, the charging power supply voltage is compared with battery voltage of the cleaning machine, and the controller generates a control signal according to the charging power supply voltage and the battery voltage. When the charging and discharging terminal is connected with the charging power supply, the control signal generated by the controller is a first signal, and the controller controls the charging power supply to charge the battery. During the charging process, constant current charging is firstly carried out, and when the voltage of the battery exceeds a set voltage threshold value, constant voltage charging is changed until the electric quantity of the battery is fully charged. When the charging and discharging terminal is disconnected with the charging power supply, the charging and discharging terminal is connected with the load, the control signal generated by the charging and discharging management module is a second signal, and the charging and discharging management module controls the battery to supply power to the load. In the charging or discharging process, if the voltage of the battery port reaches the over-discharge protection condition, the first protection module starts protection, and when the first protection module fails, the second protection module starts protection to form double protection. This charge-discharge switching circuit still is provided with antistatic protection circuit, temperature sampling circuit etc. and in the face of complicated charge-discharge operating mode, can guarantee normal charge-discharge, effectively improves the reliability and the stability of cleaning machine.
Application scenario (III)
When the sweeping robot needs to be charged, a charging and discharging terminal of the sweeping robot is connected with a charging power supply, a charging and discharging management module and a controller collect charging power supply voltage, the charging power supply voltage is compared with battery voltage of the sweeping robot, and the controller generates a control signal according to the charging power supply voltage and the battery voltage. When the charging and discharging terminal is connected with the charging power supply, the control signal generated by the controller is a first signal, and the controller controls the charging power supply to charge the battery. During the charging process, constant current charging is firstly carried out, and when the voltage of the battery exceeds a set voltage threshold value, constant voltage charging is changed until the electric quantity of the battery is fully charged. When the charging and discharging terminal is disconnected with the charging power supply, the charging and discharging terminal is connected with the load, the control signal generated by the charging and discharging management module is a second signal, and the charging and discharging management module controls the battery to supply power to the load. In the charging or discharging process, if the voltage of the battery port reaches the over-discharge protection condition, the first protection module starts protection, and when the first protection module fails, the second protection module starts protection to form double protection. This charge-discharge switching circuit still is provided with antistatic protection circuit, temperature sampling circuit etc. and in the face of complicated charge-discharge operating mode, can guarantee normal charge-discharge, effectively improves the reliability and the stability of robot of sweeping the floor.
Application scenario (IV)
The intelligent hair drier, wireless hair drier or wired hair drier all can, when the rechargeable battery who contains need charge, the charge and discharge terminal and the charging power supply of hair drier are connected, and charging and discharging management module and controller gather charging power supply voltage, compare charging power supply voltage and the battery voltage of hair drier, and the controller generates control signal according to charging power supply voltage and battery voltage. When the charging and discharging terminal is connected with the charging power supply, the control signal generated by the controller is a first signal, and the controller controls the charging power supply to charge the battery. During the charging process, constant current charging is firstly carried out, and when the voltage of the battery exceeds a set voltage threshold value, constant voltage charging is changed until the electric quantity of the battery is fully charged. When the charging and discharging terminal is disconnected with the charging power supply, the charging and discharging terminal is connected with the load, the control signal generated by the charging and discharging management module is a second signal, and the charging and discharging management module controls the battery to supply power to the load. In the charging or discharging process, if the voltage of the battery port reaches the over-discharge protection condition, the first protection module starts protection, and when the first protection module fails, the second protection module starts protection to form double protection. This charge-discharge switching circuit still is provided with antistatic protection circuit, temperature sampling circuit etc. and in the face of complicated charge-discharge operating mode, can guarantee normal charge-discharge, effectively improves the reliability and the stability of hair-dryer.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A charge-discharge switching circuit is characterized by comprising a controller and a charge-discharge management module;
the charging and discharging management module and the controller are used for collecting charging power supply voltage and generating a control signal according to the charging power supply voltage and battery voltage;
the controller is used for controlling the charging power supply to charge the battery when the control signal is a first signal; and the charging and discharging management module controls the battery to supply power to the load when the control signal is the second signal.
2. The charge-discharge switching circuit according to claim 1, further comprising the first protection module; wherein
The first protection module is used for collecting the port voltage of the battery, and cutting off the connection between the battery and the post-stage circuit when the port voltage of the battery exceeds a first preset voltage threshold value.
3. The charging and discharging switching circuit according to claim 2, further comprising a second protection module, wherein the second protection module is configured to collect a port voltage of the battery, and disconnect the battery from the subsequent circuit when the port voltage of the battery exceeds a second preset voltage threshold when the battery is charged or the battery supplies power to a load; the second preset voltage threshold is greater than the first preset voltage threshold.
4. The charge-discharge switching circuit according to claim 2, wherein the first protection module comprises a primary protection chip, a primary acquisition circuit, a discharge MOS transistor and a charge MOS transistor; wherein
The first end of the primary acquisition circuit is connected with a battery, the second end of the primary acquisition circuit is connected with the battery, and the output end of the primary acquisition circuit is connected with the data acquisition end of the primary protection chip; the input end of the discharge MOS tube is connected with the second end of the primary acquisition circuit, the output end of the discharge MOS tube is connected with the input end of the charge MOS tube, and the controlled end of the discharge MOS tube is connected with the discharge control end of the primary protection chip; the controlled end of the charging MOS tube is connected with the charging control end of the primary protection chip, and the output end of the charging MOS tube is connected with the input end of the discharging MOS tube of the second protection module.
5. The charge-discharge switching circuit according to any one of claims 1 to 4, further comprising charge-discharge terminals respectively connected to the controller and the charge-discharge management module;
when the charging and discharging terminal is connected with a charging power supply, the charging and discharging management module stops working, and the controller starts working to charge the battery;
when the charging and discharging terminal is disconnected with the charging power supply, the charging and discharging management module starts to work, and the controller is bypassed, so that the battery supplies power to the load.
6. The charge-discharge switching circuit according to claim 1, wherein the charge-discharge management module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a voltage comparator and a first MOS transistor; wherein
The first end of the first resistor is connected with the charge-discharge terminal, the second end of the first resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is grounded; the first end of the second resistor is connected with the charge and discharge terminal, and the second end of the second resistor is connected with the grid electrode of the first MOS tube; the first end of the third resistor is connected with the output end of the voltage comparator, and the second end of the third resistor is connected with the grid electrode of the first MOS tube; a first end of the fourth resistor is connected with the charge and discharge terminal, and a second end of the fourth resistor is connected with a non-inverting input end of the voltage comparator; the first end of the fifth resistor is connected with the anode of the battery, and the second end of the fifth resistor is connected with the inverting input end of the voltage comparator; the source electrode of the first MOS tube is connected with the charge-discharge terminal, and the drain electrode of the first MOS tube is connected with the battery.
7. The charge-discharge switching circuit according to claim 6, further comprising a second capacitor, a third capacitor and a fourth capacitor; wherein
A first end of the second capacitor is connected with a second end of the fourth resistor, and a second end of the second capacitor is connected with a second end of the fifth resistor; the first end of the third capacitor is connected with the second end of the fourth resistor, and the second end of the third capacitor is grounded; and the first end of the fourth capacitor is connected with the second end of the fifth resistor, and the second end of the fourth capacitor is grounded.
8. The charging and discharging switching circuit according to claim 1, further comprising an anti-static protection circuit, wherein the anti-static protection circuit is connected to the controller and the charging and discharging management module, respectively, and further connected to the charging and discharging terminal.
9. The charge-discharge switching circuit according to claim 1, further comprising a filter circuit, the filter circuit being connected to the charge-discharge terminal, the filter circuit being further connected to the battery.
10. An electronic device comprising a battery and the charge-discharge switching circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910323662.5A CN111835048B (en) | 2019-04-22 | 2019-04-22 | Charging and discharging switching circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910323662.5A CN111835048B (en) | 2019-04-22 | 2019-04-22 | Charging and discharging switching circuit and electronic equipment |
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| CN111835048B CN111835048B (en) | 2022-07-15 |
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| CN113193614A (en) * | 2021-03-08 | 2021-07-30 | 苏州泰鼎智能科技有限公司 | Low-power-consumption voltage detection system and method for sweeping robot and sweeping robot |
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| CN111835048B (en) | 2022-07-15 |
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