Power supply switch circuit, power supply circuit and energy storage module power supply circuit

Abstract

The utility model relates to the technical field of power supplies, and discloses a power supply switch circuit, a power supply circuit and an energy storage module power supply circuit, which comprises a switch module, a charge and discharge switching module and a control module, and is characterized in that when the control module detects that the continuous discharge time of an external energy storage module exceeds a preset time, the control module controls the switch module to be switched off, and the charge and discharge switching module is switched on; at the moment, the control module is powered off, the charge-discharge switching module is disconnected, and the discharge loop of the external energy storage module is cut off; the control module enables the external energy storage module to discharge to the load or enables the external power supply to charge the external energy storage module by controlling the internal access of the charging and discharging switching module. The controllable switch is additionally arranged at the power supply end of the control module, and when the battery is idle, the control module controls the controllable switch to be switched off, and then the control module loses power, so that the damage to the battery caused by self power consumption of the control module is reduced, and the service life of the battery is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of power supplies, and in particular to a power supply switch circuit, a power supply circuit and an energy storage module power supply circuit. Background Art

[0002] In recent years, the use of rechargeable batteries has increased significantly in the power supply of smart application products such as digital cameras, digital video recorders, and notebook computers. Rechargeable batteries refer to batteries that can be charged and discharged repeatedly, converting electrical energy into chemical energy for storage and then converting the stored chemical energy into electrical energy for human use.

[0003] At present, most smart application products cannot stop the battery from working, especially for protection board circuits without a fuel gauge, which makes the battery work all the time. If the smart application product is idle for a long time, the power consumption of the smart application product and the self-consumption of the battery IC will exhaust the battery power in the long idle state, and even the empty battery voltage will be lower than the safety voltage of the battery cell (usually 1.5V), which will greatly damage the battery life or even scrap the battery. Utility Model Content

[0004] In view of this, the utility model provides a power supply switch circuit, a power supply circuit and an energy storage module power supply circuit to solve the problem of eliminating the loss of battery power caused by the self-consumption of smart application products and ICs.

[0005] In a first aspect, the utility model provides a power supply switch circuit, comprising: a switch module, a charge and discharge switching module, and a control module, wherein the control module, a first end of which is used to connect to the second power supply end of an external energy storage module and the first power supply end of a load; the switch module, a first end of which is used to connect to the first power supply end of the external energy storage module, a second end of which is used to connect to the power supply end of the control module, and a control end of which is used to connect to the second end of the control module; the charge and discharge switching module, a first end of which is used to connect to the first power supply end of the external energy storage module, a second end of which is used to connect to the second power supply end of the load or to the second power supply end of an external power source, and a control end of which is connected to a third end of the control module; when the control module detects that the continuous discharge time of the external energy storage module exceeds a preset time, the control module controls the switch module to turn off, at which time the control module is powered off, the charge and discharge switching module is disconnected, and the discharge circuit of the external energy storage module is cut off; the control module controls the internal passage of the charge and discharge switching module so that the external energy storage module discharges to the load, or the external power source charges the external energy storage module.

[0006] The utility model adds a controllable switch to the power supply end of the control module. When the battery is idle, the control module controls the controllable switch to be turned off, and the control module loses power, thereby reducing the damage to the battery caused by the self-consumption of the control module and protecting the battery life.

[0007] In a specific embodiment, the switch module includes: a first controllable switch, a first end of which is used to connect to a first power supply end of an external energy storage module, a second end of which is used to connect to a power supply end of a control module, and a control end of which is used to connect to a third end of the control module; when the control module detects that the continuous discharge time of the external energy storage module exceeds a preset time, the control module controls the first controllable switch to turn off.

[0008] In a specific embodiment, the charge and discharge switching module includes: a first capacitor, a second capacitor, a second controllable switch and a third controllable switch, wherein the second controllable switch has a first end used to be connected to the first power supply end of the external energy storage module, a second end used to be connected to the first end of the third controllable switch, and a control end used to be connected to the third end of the control module; the third controllable switch has a second end used to be connected to the second power supply end of the load, and a control end used to be connected to the third end of the control module; the first capacitor has a first end used to be connected to the first end of the second controllable switch, and a second end used to be connected to the first end of the second capacitor; the second capacitor has a second end used to be connected to the second end of the third controllable switch.

[0009] In a specific embodiment, the control module includes: an electricity meter and a host, wherein the electricity meter has a power supply end connected to the second end of the switch module, a first end connected to the second power supply end of the external energy storage module and the first power supply end of the load, and a second end connected to the control end of the charge-discharge switching module, and is used to control the internal path of the charge-discharge switching module so that the external energy storage module discharges to the load, or the external power supply charges the external energy storage module; when it is detected that the continuous discharge time of the external energy storage module exceeds a preset time, an idle signal is sent to the host; the host has a first end connected to the third end of the electricity meter, and a second end connected to the control end of the switch module, and is used to control the switch module to shut down after receiving the idle signal.

[0010] In a specific embodiment, the power supply switch circuit also includes: a battery protection circuit, a first end of which is used to connect to the first power supply end of the external energy storage module, a second end of which is used to connect to the first end of the charge and discharge switching module, and a control end of which is used to connect to the fourth end of the control module; when the control module detects that the current of the external energy storage module exceeds a preset threshold, the control module controls the battery protection circuit to shut down.

[0011] In a specific embodiment, the power supply switch circuit further includes: a voltage stabilizing circuit, a first end of which is used to connect to the second end of the charge and discharge switching module, and a second end of which is grounded, and is used to stabilize the voltage of the second end of the charge and discharge switching module.

[0012] In a specific embodiment, the voltage stabilizing circuit includes: a third capacitor, a fourth capacitor and a transient suppression diode, wherein the transient suppression diode has a first end used to connect to the second end of the charge and discharge switching module and the first end of the third capacitor, and a second end thereof is grounded; the third capacitor has a second end used to be grounded through the fourth capacitor.

[0013] In a specific implementation, the power switch circuit further includes: a control button, a first end of which is used to connect to the control end of the switch module, and a second end of which is used to receive a control command, and the control command is used to control the switch module to shut down.

[0014] In a second aspect, the utility model provides a power supply circuit, comprising: an energy storage module and a power supply switch circuit of any optional implementation in the first aspect, wherein the power supply switch circuit is connected between the energy storage module and the load, and is used to detect that when the continuous discharge time of the energy storage module exceeds a preset time, it cuts off the connection between the energy storage module and the load; it is also used to connect the energy storage module to the load, and the energy storage module supplies power to the load.

[0015] In a specific embodiment, the energy storage module includes: at least one battery.

[0016] In a third aspect, the utility model provides a power supply circuit for an energy storage module, comprising: a power supply and a power supply switch circuit of any optional implementation in the first aspect, wherein the power supply switch circuit is connected between the power supply switch circuit and the energy storage module, and is used to connect the power supply and the energy storage module so that the power supply supplies power to the energy storage module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 is a composition diagram of a power supply switch circuit according to an embodiment of the utility model;

[0019] Figure 2 is a composition diagram of another power supply switch circuit according to an embodiment of the utility model;

[0020] Figure 3 It is a composition diagram of a charge-discharge switching module according to an embodiment of the utility model;

[0021] Figure 4 is a composition diagram of another power supply switch circuit according to an embodiment of the utility model;

[0022] Figure 5 It is a composition diagram of another power supply switch circuit of an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0024] In this embodiment, a power supply switch circuit 1 is provided. Figure 1 As shown, it includes: a switch module 11, a charge and discharge switching module 12, and a control module 13.

[0025] like Figure 1 As shown, the switch module 11 has a first end connected to the first power supply end of the external energy storage module 2, a second end connected to the power supply end of the control module 13, and a control end connected to the second end of the control module 13; the control module 13 has a first end connected to the second power supply end of the external energy storage module and the first power supply end of the load; the charge and discharge switching module 12 has a first end connected to the first power supply end of the external energy storage module, a second end connected to the second power supply end of the load and the second power supply end of the external power supply, and a control end connected to the third end of the control module 13.

[0026] Specifically, when the control module 13 detects that the continuous discharge time of the external energy storage module exceeds the preset time, the control module 13 controls the switch module 11 to turn off. At this time, the control module 13 is powered off, the charge and discharge switching module 12 is disconnected, and the discharge circuit of the external energy storage module is cut off.

[0027] Specifically, the control module 13 controls the internal path of the charge-discharge switching module 12 so that the external energy storage module discharges to the load, or the external power source charges the external energy storage module.

[0028] Specifically, the control module 13 of this embodiment can control the on-off state of the charge-discharge switching module 12 to realize the charging and discharging of the energy storage module. At the same time, when the control module 13 detects that the battery is in an idle state for a long time, that is, when the continuous discharge time of the energy storage module exceeds the preset time, the control module 13 controls the switch module 11 to turn off. At this time, after the control module 13 loses power, the charge-discharge switching module 12 is turned off, and the energy storage module is disconnected from the load.

[0029] Optionally, the control module 13 of this embodiment is internally composed of a detection circuit, a comparison circuit, etc. The detection circuit can realize voltage detection and current detection, and the comparison circuit can realize functions such as threshold comparison.

[0030] In some specific embodiments, Figure 2 As shown, the switch module 11 includes: a first controllable switch Q1, a first end of which is connected to a first power supply end of an external energy storage module, a second end of which is connected to a power supply end of a control module 13, and a control end of which is connected to a third end of the control module 13; when the control module 13 detects that the continuous discharge time of the external energy storage module exceeds a preset time, the control module 13 controls the first controllable switch Q1 to be turned off.

[0031] Specifically, Figure 2 The first controllable switch Q1 is taken as an example of a MOS tube, but it can be other controllable switches, such as IGBT, etc. When the gate of the first controllable switch Q1 is at a high level, the first controllable switch Q1 is turned on, and the control module 13 works normally. When the gate of the first controllable switch Q1 is at a low level, the first controllable switch Q1 is turned off, and the control module 13 loses power.

[0032] In some specific embodiments, Figure 3 As shown, the charge-discharge switching module 12 includes: a first capacitor C1, a second capacitor C2, a second controllable switch Q2 and a third controllable switch Q3, wherein the second controllable switch Q2 has a first end connected to the first power supply end of the external energy storage module, a second end connected to the first end of the third controllable switch Q3, and a control end connected to the third end of the control module 13; the third controllable switch Q3 has a second end connected to the second power supply end of the load, and a control end connected to the third end of the control module 13; the first capacitor C1 has a first end connected to the first end of the second controllable switch Q2, and a second end connected to the first end of the second capacitor C2; the second capacitor C2 has a second end connected to the second end of the third controllable switch Q3.

[0033] Specifically, the third controllable switch Q3 of this embodiment is always in the on state, while the on or off state of the second controllable switch Q2 is controlled by the control switch circuit, for example Figure 3 The fifth controllable switch Q5 in the control module 13 is controlled to be disconnected, thereby disconnecting the second controllable switch Q2, and the load is disconnected from the energy storage module; when the power supply is needed to charge the energy storage module, the control module 13 transmits a high level to the fifth controllable switch Q5, and the fifth controllable switch Q5 is turned on, thereby turning on the second controllable switch Q2, and at this time, a connection is established between the power supply and the energy storage module, and the power supply charges the energy storage module.

[0034] Specifically, the first capacitor C1 and the second capacitor C2 are support capacitors. When the fifth controllable switch Q5 and the second controllable switch Q2 are actuated, the switching action will cause the charging voltage of the energy storage module to fluctuate. Therefore, support capacitors are provided to suppress voltage fluctuations and make the charging voltage smoother.

[0035] In some specific embodiments, Figure 4 As shown, the control module 13 includes: an electric meter 131 and a host 132 .

[0036] like Figure 4 As shown, the power meter 131 has a power supply end connected to the second end of the switch module 11, a first end connected to the second power supply end of the external energy storage module and the first power supply end of the load, and a second end connected to the control end of the charge-discharge switching module 12, and is used to control the internal path of the charge-discharge switching module 12 so that the external energy storage module discharges to the load, or the external power supply charges the external energy storage module; when it is detected that the continuous discharge time of the external energy storage module exceeds the preset time, an idle signal is sent to the host 132.

[0037] Specifically, during normal power supply, the power meter 131 can detect the voltage at the energy storage module terminal and the voltage at the power supply terminal, and determine whether the energy storage module or the power supply is abnormal based on the detected voltage. If abnormal, the connection between the energy storage module and the load, and between the energy storage module and the power supply is switched in time.

[0038] like Figure 4 As shown, the host 132 has a first end connected to the third end of the electricity meter 131 and a second end connected to the control end of the switch module 11, and is used to control the switch module 11 to turn off after receiving the idle signal.

[0039] Specifically, in order to avoid the loss of battery caused by the self-consumption of battery IC and the self-consumption of smart application products and to achieve the purpose of protecting battery life, the fuel meter 131 of this embodiment will also detect whether the energy storage module is in an idle state. The idle state can be determined by judging whether the energy storage module is in a long-term discharge state. When in this state, an idle signal is sent to the host 132. After the host 132 controls the switch module 11 to turn off, the fuel meter 131 loses power, thereby disconnecting the energy storage module from the load.

[0040] In some specific embodiments, Figure 5 As shown, the power supply switch circuit 1 also includes: a battery protection circuit 14, a first end of which is connected to the first power supply end of the external energy storage module, a second end of which is connected to the first end of the charge and discharge switching module, and a control end of which is connected to the fourth end of the control module 13; when the control module 13 detects that the current of the external energy storage module exceeds a preset threshold, the control module 13 controls the battery protection circuit to shut down.

[0041] Specifically, during the normal charging and discharging process of the energy storage module, the control module 13 detects the terminal voltage of the energy storage module. When the terminal voltage of the energy storage module is abnormal, the control module 13 controls the battery protection circuit 4 to shut down and switches the connection between the energy storage module and the load. The battery protection circuit 4 may include an electronic resistor or a controllable switch, etc., which is not limited here.

[0042] In some specific embodiments, the power supply switch circuit 1 further includes: a voltage stabilizing circuit, a first end of which is connected to the second end of the charge and discharge switching module and a second end of which is grounded, for stabilizing the voltage of the second end of the charge and discharge switching module.

[0043] Specifically, Figure 3 As shown, the voltage stabilizing circuit includes: a third capacitor C3, a fourth capacitor C4 and a transient suppression diode TVS1, wherein the transient suppression diode TVS1 has a first end connected to the second end of the charge and discharge switching module and the first end of the third capacitor C3, and a second end thereof is grounded; the third capacitor C3 has a second end grounded through the fourth capacitor C4.

[0044] Specifically, the TVS tube is a diode-shaped device. Its principle is a bit like a voltage-stabilizing diode, both of which use reverse breakdown to stabilize voltage, but the response speed of the TVS tube is faster than that of the voltage-stabilizing diode. When the TVS tube is subjected to a reverse transient high-energy impact, it can change the impedance between the two poles to a low impedance at an extremely high speed (sub-nanosecond level), thus having a good surge power absorption capacity, and at the same time can keep the voltage between the two poles at a predetermined value, effectively protecting other components in the circuit from damage by surge pulses.

[0045] In some specific implementations, the power switch circuit 1 further includes: a control button, a first end of which is connected to the control end of the switch module 11 , and a second end of which receives a control command, and the control command is used to control the switch module 11 to turn off.

[0046] Specifically, the control button of this embodiment can be set on the host 132. Based on this, the switch module 11 has two control modes: manual control and automatic control. Among them, manual control means that the smart application product host 132 can directly control the opening and closing of the switch module 11 by sending commands; automatic control means that the power meter 131 will add an automatic control program, and the automatic control program controls the switch module 11 by determining whether the battery is in an idle state for a long time.

[0047] This embodiment provides a power supply circuit, such as Figure 1As shown, it includes: an energy storage module 2 and a power supply switch circuit 1 of any optional implementation of the above embodiments, wherein the power supply switch circuit is connected between the energy storage module and the load, and is used to detect that when the continuous discharge time of the energy storage module exceeds a preset time, it cuts off the connection between the energy storage module and the load; it is also used to connect the energy storage module to the load, and the energy storage module supplies power to the load. Optionally, the energy storage module includes: at least one battery.

[0048] The power supply circuit of this embodiment has the function of preventing the energy storage module from being in a discharging state all the time. Specifically, when the control module 13 detects that the continuous discharge time of the external energy storage module exceeds the preset time, the control module 13 controls the switch module 11 to turn off. At this time, the control module 13 is powered off, the charge and discharge switching module 12 is disconnected, and the discharge circuit of the energy storage module is cut off.

[0049] The power supply circuit of this embodiment also has a function of forming an energy storage module as a load power supply circuit. Specifically, the control module 13 controls the internal path of the charge-discharge switching module 12 so that the energy storage module discharges to the load.

[0050] Specifically, the power supply circuit of this embodiment differs from the battery-based power supply circuit in the prior art in that a controllable switch is added to the power supply end of the fuel meter 131. When the battery is idle, the host 132 controls the controllable switch to turn off, and the fuel meter 131 loses power, thereby reducing the damage to the battery caused by the self-consumption of the fuel meter 131 and protecting the battery life.

[0051] This embodiment provides a power supply circuit for an energy storage module, such as Figure 1 As shown, it includes: a power supply and a power supply switch circuit of any optional implementation mode of the above embodiments, wherein the power supply switch circuit is connected between the power supply switch circuit and the energy storage module, and is used to connect the power supply and the energy storage module so that the power supply supplies power to the energy storage module.

[0052] Specifically, the control module 13 controls the internal path of the charge-discharge switching module 12 so that the power supply charges the external energy storage module.

[0053] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A power supply switch circuit, characterized in that: include: Switch module, charge and discharge switching module, control module, among which, A control module, a first end of which is used to connect to a second power supply end of an external energy storage module and a first power supply end of a load; A switch module, wherein a first end of the switch module is used to connect to a first power supply end of an external energy storage module, a second end of the switch module is used to connect to a power supply end of the control module, and a control end of the switch module is used to connect to a second end of the control module; A charge-discharge switching module, wherein a first end of the module is used to connect to a first power supply end of an external energy storage module, a second end of the module is used to connect to a second power supply end of the load or to a second power supply end of an external power source, and a control end of the module is used to connect to a third end of the control module; When the control module detects that the continuous discharge time of the external energy storage module exceeds the preset time, the control module controls the switch module to turn off, at which time the control module is powered off, the charge-discharge switching module is disconnected, and the discharge circuit of the external energy storage module is cut off; The control module controls the internal path of the charge-discharge switching module so that the external energy storage module discharges to the load, or the external power supply charges the external energy storage module.

2. The power switch circuit according to claim 1, characterized in that: The switch module comprises: A first controllable switch, wherein a first end of the first controllable switch is connected to a first power supply end of the external energy storage module, a second end of the first controllable switch is connected to a power supply end of the control module, and a control end of the first controllable switch is connected to a third end of the control module; When the control module detects that the continuous discharge time of the external energy storage module exceeds a preset time, the control module controls the first controllable switch to turn off.

3. The power switch circuit according to claim 1, characterized in that: The charge-discharge switching module includes: a first capacitor, a second capacitor, a second controllable switch and a third controllable switch, wherein: A second controllable switch, wherein a first end of the second controllable switch is connected to a first power supply end of the external energy storage module, a second end of the second controllable switch is connected to a first end of the third controllable switch, and a control end of the second controllable switch is connected to a third end of the control module; a third controllable switch, a second end of which is used to be connected to the second power supply end of the load, and a control end of which is used to be connected to the third end of the control module; a first capacitor, a first end of which is used to be connected to the first end of the second controllable switch, and a second end of which is used to be connected to the first end of the second capacitor; The second capacitor has a second end connected to the second end of the third controllable switch.

4. The power switch circuit according to claim 1, characterized in that: The control module includes: an electric meter and a host, wherein: An electric meter, whose power supply end is used to be connected to the second end of the switch module, whose first end is used to be connected to the second power supply end of the external energy storage module and the first power supply end of the load, and whose second end is used to be connected to the control end of the charge-discharge switching module, and which is used to control the internal path of the charge-discharge switching module so that the external energy storage module discharges to the load, or the external power supply charges the external energy storage module; when it is detected that the continuous discharge time of the external energy storage module exceeds the preset time, an idle signal is sent to the host; A host, whose first end is used to connect to the third end of the electricity meter, and whose second end is used to connect to the control end of the switch module, is used to control the switch module to turn off after receiving the idle signal.

5. The power switch circuit according to claim 1, characterized in that: Also includes: A battery protection circuit, wherein a first end of the battery protection circuit is used to be connected to a first power supply end of the external energy storage module, a second end of the battery protection circuit is used to be connected to a first end of the charge-discharge switching module, and a control end of the battery protection circuit is used to be connected to a fourth end of the control module; When the control module detects that the current of the external energy storage module exceeds a preset threshold, the control module controls the battery protection circuit to shut down.

6. The power switch circuit according to claim 1, characterized in that: Also includes: A voltage stabilizing circuit, a first end of which is used to be connected to the second end of the charge-discharge switching module and a second end of which is grounded, is used to stabilize the voltage of the second end of the charge-discharge switching module.

7. The power switch circuit according to claim 6, characterized in that: The voltage stabilizing circuit includes: a third capacitor, a fourth capacitor and a transient suppression diode, wherein: A transient voltage suppression diode, a first end of which is used to be connected to the second end of the charge-discharge switching module and the first end of the third capacitor, and a second end of which is grounded; The third capacitor has a second end connected to the ground through the fourth capacitor.

8. The power switch circuit according to claim 1, characterized in that: Also includes: A control button, a first end of which is used to connect to the control end of the switch module, and a second end of which is used to receive a control command, wherein the control command is used to control the switch module to turn off.

9. A power supply circuit, characterized in that: include: The energy storage module and the power supply switch circuit according to any one of claims 1 to 8, wherein: A power supply switch circuit is connected between the energy storage module and the load. When it detects that the continuous discharge time of the energy storage module exceeds a preset time, it cuts off the connection between the energy storage module and the load. It is also used to connect the energy storage module to the load, and the energy storage module supplies power to the load.

10. The power supply circuit according to claim 9, characterized in that: The energy storage module includes: at least one battery.

11. A power supply circuit for an energy storage module, characterized in that: include: A power supply and a power supply switch circuit as claimed in any one of claims 1 to 8, wherein: The power supply switch circuit is connected between the power supply switch circuit and the energy storage module, and is used to connect the external power supply and the energy storage module so that the external power supply supplies power to the energy storage module.

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