Charging and discharging control circuit and electronic equipment

Abstract

The utility model discloses a charge and discharge control circuit, and the circuit comprises an input end which is connected with a power end; the energy storage unit is connected with the input end and is used for storing electric energy; the control unit is arranged between the input end and the energy storage unit and is used for monitoring a voltage signal of the energy storage unit so as to send out a control signal; the switch unit is respectively connected with the input end, the control unit and the energy storage unit and is used for receiving the control signal so as to connect and disconnect the input end and the energy storage unit; and the output end is connected with the energy storage unit and is used for sending the electric energy to a power utilization end so as to charge the power utilization end. The super-capacitor is reasonable in structural design, and compared with a common battery, the super-capacitor stops charging until the voltage at the two ends of the super-capacitor reaches the corresponding threshold value, full charging is achieved, loading current is rapidly provided, and in addition, the problem of overcharging is avoided.

Description

Technical Field

[0001] The present application relates to the field of charge and discharge technology, and in particular to a charge and discharge control circuit and electronic equipment. Background Art

[0002] The general traditional energy storage solution is to use lithium-ion batteries, which have the following problems: prolonged charging time; overcharging of the terminal electrodes; the need for additional charging management components; short life cycle; low operating temperature tolerance. Therefore, this solution requires the charging control circuit to be able to stably adjust the charging voltage and charging current, and also to achieve a balance in charging conditions, otherwise the lithium-ion battery will be unstable in charging, which will further reduce its life cycle. Utility Model Content

[0003] The purpose of the embodiment of the present application is to provide a charge and discharge control circuit and an electronic device, wherein the charge and discharge control circuit includes:

[0004] An input terminal connected to a power supply terminal;

[0005] An energy storage unit, connected to the input end and used for storing electric energy;

[0006] A control unit, which is disposed between the input terminal and the energy storage unit and is used to monitor the voltage signal of the energy storage unit to issue a control signal;

[0007] a switch unit, connected to the input end, the control unit and the energy storage unit respectively, and used for receiving the control signal to switch the input end and the energy storage unit on and off;

[0008] An output end, connected to the energy storage unit, for sending the electric energy to a power consumption end to charge the power consumption end;

[0009] The current limiting unit is arranged between the output end and the energy storage unit, and is used to limit the current signal when the power end is charged, and is also used to assist the energy storage unit in discharging when the power end is turned off.

[0010] As an optional embodiment, the control unit includes:

[0011] A first chip, a second pin of which is connected to the input terminal;

[0012] The second chip has a second pin connected to the third pin of the first chip, and the third pin is grounded.

[0013] As an optional embodiment, the fifth pin of the first chip and the fifth pin of the second chip are respectively connected to delay capacitors, and the delay capacitors are used to delay sending the control signal.

[0014] As an optional embodiment, the switch unit includes:

[0015] A first switch, a gate of which is connected to the first pin of the first chip, and a drain of which is connected to a line between the input terminal and the second pin of the first chip;

[0016] The second switch has a gate connected to the first pin of the second chip, a drain connected to the source of the first switch and the third pin of the first chip, and a source connected to the ground.

[0017] As an optional embodiment, the gate of the first switch and the gate of the second switch are respectively connected to bias resistors, and the bias resistors are used to keep the first switch and the second switch in an off state.

[0018] As an optional embodiment, the drain of the first switch and the drain of the second switch are respectively connected to current limiting resistors, and the current limiting resistors are used to protect the first switch and the second switch.

[0019] As an optional embodiment, the energy storage unit includes:

[0020] A first capacitor, one end of which is connected to the input end;

[0021] A second capacitor, one end of which is connected to the other end of the first capacitor, and the other end of which is grounded;

[0022] A third capacitor, one end of which is connected to the input end and is connected in parallel with the first capacitor;

[0023] A fourth capacitor has one end connected to the other end of the third capacitor and the other end grounded.

[0024] As an optional embodiment, the current limiting unit includes:

[0025] A first resistor, one end of which is connected to one end of the third capacitor;

[0026] The second resistor has one end connected to the other end of the first resistor and the other end grounded.

[0027] The purpose of the embodiment of the present application is also to provide an electronic device, including an electronic device body and also including the charging and discharging control circuit as mentioned above.

[0028] As an optional embodiment, the electronic device body is a notebook computer.

[0029] The beneficial effects of the embodiments of the present application are:

[0030] The structure of the present application is reasonably designed. Compared with ordinary batteries, the charging of the supercapacitor will stop when the voltage at both ends reaches the corresponding threshold, so that the supercapacitor is fully charged, and then the load current is quickly provided, and the problem of overcharging will not occur. Moreover, based on the comparison between the detected voltage and the threshold, it can withstand faster charging and discharging switching, which is suitable for short-term energy storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural diagram of an embodiment of the present application;

[0032] Figure 2 A circuit diagram of an embodiment of the present application;

[0033] Figure 3 Graph showing test results of the embodiment of the present application and the traditional solution.

[0034] Reference numerals:

[0035] 1. Input end; 2. Energy storage unit; 3. Control unit; 4. Switch unit; 5. Output end; 6. Current limiting unit; U7001, first chip; U7004, second chip; Q7001, first switch; Q7002, second switch; C7069, first capacitor; C7067, second capacitor; C7068, third capacitor; C7066, fourth capacitor; R7031, first resistor; R7033, second resistor. DETAILED DESCRIPTION

[0036] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0037] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0038] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0039] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0040] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to readily implement many other equivalent forms of the present application.

[0041] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0042] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0043] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0044] The purpose of the embodiments of the present application is to provide a charge and discharge control circuit and an electronic device, wherein the charge and discharge control circuit includes an input terminal 1, an energy storage unit 2, a control unit 3, a switch unit 4, an output terminal 5 and a current limiting unit 6.

[0045] The input terminal 1 is connected to the power supply terminal, which is used to provide power to charge the energy storage unit 2. The energy storage unit 2 is connected to the input terminal 1 and is used to store electric energy. The control unit 3 is arranged between the input terminal 1 and the energy storage unit 2, and is used to monitor the voltage signal of the energy storage unit 2 to issue a control signal.

[0046] The switch unit 4 is connected to the input terminal 1, the control unit 3 and the energy storage unit 2 respectively, and is used to receive the control signal to switch the input terminal 1 and the energy storage unit 2. The output terminal 5 is connected to the energy storage unit 2, and is used to send the electric energy to the power consumption terminal to charge the power consumption terminal.

[0047] The current limiting unit 6 is disposed between the output end 5 and the energy storage unit 2, and is used to limit the current signal when the power end is charged, and is also used to assist the energy storage unit 2 in discharging when the power end is turned off.

[0048] When in use, the control unit 3 continuously monitors the voltage level between the input terminal 1 and the energy storage unit 2. When the monitored voltage is lower than the set threshold, the control signal output by the control unit 3 is a low-level signal, and the low-level signal turns off the switch unit 4. After the switch unit 4 is turned off, the electric energy at the power supply end starts to flow to the energy storage unit 2 for charging.

[0049] When the control unit 3 detects that the voltage of the energy storage unit 2 rises above the set threshold, the control unit 3 outputs a high-level control signal, which causes the switch unit 4 to open, thereby performing voltage balance through the switch unit 4 to prevent overcharging of the energy storage unit 2. At this time, when the power consumption end needs to use the electric energy stored in the energy storage unit 2, the external switch is activated, allowing the electric energy in the energy storage unit 2 to flow to the power consumption end for charging.

[0050] When the power end is turned off or does not need to be discharged, auxiliary discharge is performed through the current limiting unit 6 to slowly release the electric energy in the capacitor. When the power end is completely turned off, the current limiting unit 6 continues to work to ensure that the electric energy in the energy storage unit 2 is safely released.

[0051] Through this design, the charge and discharge control circuit can effectively avoid the problems that may occur during the charging process of lithium-ion batteries, such as overcharging, long charging time, etc. Figure 2 As shown, compared with the traditional solution, the present application improves the safety of the system and the service life of the capacitor.

[0052] As an optional embodiment, the control unit 3 includes a first chip U7001 and a second chip U7004. The second pin of the first chip U7001 is connected to the input terminal 1, the second pin of the second chip U7004 is connected to the third pin of the first chip U7001, and the third pin is grounded.

[0053] As an optional embodiment, the fifth pin of the first chip U7001 and the fifth pin of the second chip U7004 are respectively connected to a delay capacitor, and the delay capacitor is used to delay sending the control signal. The delay capacitor is Figure 1 C7070 and C7077 shown.

[0054] As an optional embodiment, the switch unit 4 includes a first switch Q7001 and a second switch Q7002. The gate of the first switch Q7001 is connected to the first pin of the first chip U7001, and the drain thereof is connected to the line between the input terminal 1 and the second pin of the first chip U7001. The gate of the second switch Q7002 is connected to the first pin of the second chip U7004, and the drain thereof is respectively connected to the source of the first switch Q7001 and the third pin of the first chip U7001, and the source thereof is grounded.

[0055] As an optional embodiment, the gate of the first switch Q7001 and the gate of the second switch Q7002 are respectively connected to bias resistors, and the bias resistors are used to keep the first switch Q7001 and the second switch Q7002 in an off state. When the first pin of the control unit 3 fails, the switch unit 4 can be kept in an off state through the bias resistor. The bias resistor is Figure 1 R7036 and R7037 shown.

[0056] As an optional embodiment, the drain of the first switch Q7001 and the drain of the second switch Q7002 are respectively connected to current limiting resistors, and the current limiting resistors are used to protect the first switch Q7001 and the second switch Q7002. Figure 1 R7033 and R7035 shown.

[0057] As an optional embodiment, the energy storage unit 2 includes a first capacitor C7069, a second capacitor C7067, a third capacitor C7068 and a fourth capacitor C7066, and all of them are super capacitors.

[0058] One end of the first capacitor C7069 is connected to the input terminal 1, one end of the second capacitor C7067 is connected to the other end of the first capacitor C7069, and the other end thereof is grounded. One end of the third capacitor C7068 is connected to the input terminal 1 and is connected in parallel with the first capacitor C7069, one end of the fourth capacitor C7066 is connected to the other end of the third capacitor C7068, and the other end thereof is grounded. The first capacitor C7069-fourth capacitor C7066 are used to store electric energy, so as to provide electric energy to the power-consuming end under the action of an external switch, and the layout of the capacitors enables the present application to have a greater discharge power and meet more usage requirements.

[0059] As an optional embodiment, the current limiting unit 6 includes a first resistor R7031 and a second resistor R7033. One end of the first resistor R7031 is connected to one end of the third capacitor C7068. One end of the second resistor R7033 is connected to the other end of the first resistor R7031, and the other end thereof is grounded.

[0060] When the power consumption end is charged, that is, during the discharge of the energy storage unit 2, the first resistor R7031 and the second resistor R7033 are used to adjust the current and balance the discharge capacity of the energy storage unit 2. In addition, when the power consumption end is turned off, the first resistor R7031 and the second resistor R7033 are used to release the electric energy in the energy storage unit 2 to achieve safe discharge and ensure that the power consumption end will not produce abnormalities due to the residual charge in the energy storage unit 2 after shutdown.

[0061] The purpose of the embodiment of the present application is also to provide an electronic device, including an electronic device body and a charge and discharge control circuit as described above, wherein the electronic device body is a laptop computer, wherein the laptop computer is a power consumption end, and the power consumption end can also be a product such as an electronic door lock.

[0062] When in use, when the second pin of the first chip U7001 detects that the voltage of the line between the energy storage unit 2 and the input terminal 1 is lower than the threshold, the first pin of the first chip U7001 sends a low-level signal to the first switch Q7001, and the first switch Q7001 is in the off state. Similarly, the second chip U7004 makes the second switch Q7002 also in the off state. At this time, the power supply end can directly charge the first capacitor C7069-the fourth capacitor C7066, and the charging current is also adjusted through the first resistor R7031 and the second resistor R7033 during charging. When the first chip U7001 detects that the voltage reaches the threshold, the charging is completed.

[0063] If the power consumption end needs to be charged at this time, turn on the external switch. The second pin of the first chip U7001 detects that the voltage of the line between the energy storage unit 2 and the input terminal 1 is higher than the threshold, and sends a high-level signal to the first switch Q7001. The first switch Q7001 is in the on state. Similarly, the second chip U7004 makes the second switch Q7002 also in the on state. At this time, the first capacitor C7069-the fourth capacitor C7066 discharges at the same time to charge the power consumption end, and the first switch Q7001 and the second switch Q7002 can balance the voltage to ensure the performance and life of the supercapacitor. In addition, the first resistor R7031 and the second resistor R7033 can also adjust the current to balance the discharge capacity of the supercapacitor.

[0064] When the input terminal 1 is not connected to the power supply terminal, that is, the electrical device is turned off, the electricity in the super capacitor is discharged through the first resistor R7031 and the second resistor R7033 to protect the circuit.

[0065] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A charge and discharge control circuit, characterized in that: include: An input terminal connected to a power supply terminal; An energy storage unit, connected to the input end and used for storing electric energy; A control unit, which is disposed between the input terminal and the energy storage unit and is used to monitor the voltage signal of the energy storage unit to issue a control signal; a switch unit, connected to the input end, the control unit and the energy storage unit respectively, and used for receiving the control signal to switch the input end and the energy storage unit on and off; An output end, connected to the energy storage unit, for sending the electric energy to a power consumption end to charge the power consumption end; The current limiting unit is arranged between the output end and the energy storage unit, and is used to limit the current signal when the power end is charged, and is also used to assist the energy storage unit in discharging when the power end is turned off.

2. The charge and discharge control circuit according to claim 1, characterized in that: The control unit comprises: A first chip, a second pin of which is connected to the input terminal; The second chip has a second pin connected to the third pin of the first chip, and the third pin is grounded.

3. The charge and discharge control circuit according to claim 2, characterized in that: The fifth pin of the first chip and the fifth pin of the second chip are respectively connected to delay capacitors, and the delay capacitors are used to delay sending of the control signal.

4. The charge and discharge control circuit according to claim 2, characterized in that: The switch unit comprises: A first switch, a gate of which is connected to the first pin of the first chip, and a drain of which is connected to a line between the input terminal and the second pin of the first chip; The second switch has a gate connected to the first pin of the second chip, a drain connected to the source of the first switch and the third pin of the first chip, and a source connected to the ground.

5. The charge and discharge control circuit according to claim 4, characterized in that: The gate of the first switch and the gate of the second switch are respectively connected to bias resistors, and the bias resistors are used to keep the first switch and the second switch in an off state.

6. The charge and discharge control circuit according to claim 4, characterized in that: The drain of the first switch and the drain of the second switch are respectively connected to current limiting resistors, and the current limiting resistors are used to protect the first switch and the second switch.

7. The charge and discharge control circuit according to claim 1, characterized in that: The energy storage unit comprises: A first capacitor, one end of which is connected to the input end; A second capacitor, one end of which is connected to the other end of the first capacitor, and the other end of which is grounded; A third capacitor, one end of which is connected to the input end and is connected in parallel with the first capacitor; A fourth capacitor has one end connected to the other end of the third capacitor and the other end grounded.

8. The charge and discharge control circuit according to claim 7, characterized in that: The current limiting unit comprises: A first resistor, one end of which is connected to one end of the third capacitor; The second resistor has one end connected to the other end of the first resistor and the other end grounded.

9. An electronic device, comprising an electronic device body, characterized in that: It also includes the charge and discharge control circuit as described in any one of claims 1-8.

10. The electronic device according to claim 9, characterized in that: The electronic equipment body is a notebook computer.

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