Battery power supply circuit and electronic equipment

Abstract

The invention provides a battery power supply circuit and electronic equipment, and is applied to the technical field of batteries. The charging circuit comprises a charging circuit, a rechargeable battery and a load switch circuit, the output end of the charging circuit is connected with the rechargeable battery, and the charging circuit is used for charging the rechargeable battery; the load switch circuit comprises at least two paths connected with a load, and at least one path comprises a switch; and the rechargeable battery is connected with the load through the load switch circuit and is used for supplying power to the corresponding load when the switch is switched on. Therefore, paths for connecting the charging circuit and the load switch circuit with different loads are added in the connecting circuit of the battery. The charging circuit in the battery power supply circuit charges the rechargeable battery from the charging aspect, the electric quantity of the rechargeable battery is improved, different paths ensure that the same electric quantity of the rechargeable battery can support longer work time from the energy saving aspect, and important data are prevented from being lost.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery powered circuit and electronic equipment. Background Art

[0002] In today's society, various data are growing explosively, and the demand for electronic devices with different functions is increasing. Each of them has a button battery to store important information such as the time and basic settings of the electronic device.

[0003] However, the power of button batteries currently used in the market is limited. After some electronic devices with low usage frequency are turned off for a long time, the battery power may be exhausted, resulting in loss of information such as time.

[0004] It can be seen that how to extend the service life of button batteries is a problem that technical personnel in this field need to solve. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a battery-powered circuit and an electronic device, which can solve the problem in the prior art that after some electronic devices with low usage frequency are shut down for a long time, the battery power may be exhausted, thereby losing information such as time.

[0006] To solve the above technical problems, on the one hand, an embodiment of the present invention provides a battery power supply circuit, including: a charging circuit, a rechargeable battery and a load switch circuit;

[0007] The output end of the charging circuit is connected to the rechargeable battery for charging the rechargeable battery;

[0008] The load switch circuit includes at least two paths connected to the load, at least one of the paths includes a switch;

[0009] The rechargeable battery is connected to the load through the load switch circuit, so that the rechargeable battery can supply power to the corresponding load when the switch is turned on.

[0010] In some embodiments, the load switch circuit includes two paths connected to the load, wherein the first path is a direct connection path, and the second path is a switch path, and the switch path includes at least one switch.

[0011] In some embodiments, the direct path includes: a first diode and a second diode;

[0012] The anode of the first diode is connected to the anode of the rechargeable battery;

[0013] The cathode of the first diode is connected to the cathode of the second diode, and both are connected to the corresponding load;

[0014] The anode of the second diode is connected to the first standby power supply.

[0015] In some embodiments, the switch path includes: a switch, the switch being a first MOS tube;

[0016] The source of the first MOS tube is connected to the cathode of the first diode and the cathode of the second diode;

[0017] The gate of the first MOS tube is connected to the power supply;

[0018] The drain of the first MOS tube is connected to the corresponding load.

[0019] In some embodiments, it further includes: a charging voltage detection circuit, a monitoring switch circuit, and a redundancy circuit;

[0020] The output end of the charging voltage detection circuit is connected to the control end of the charging circuit, and is used to control the charging circuit to charge the rechargeable battery;

[0021] The monitoring switch circuit is connected to the rechargeable battery and the load switch circuit, and is used to monitor whether the voltage corresponding to the rechargeable battery is abnormal;

[0022] The redundant circuit is connected in parallel with the rechargeable battery and is used to replace the rechargeable battery to supply power to the load when the voltage corresponding to the rechargeable battery is abnormal.

[0023] Preferably, the charging circuit comprises: a second MOS tube, a first resistor, a second resistor and a third diode;

[0024] Wherein, the source of the second MOS tube is connected to the second standby power supply as the input end of the charging circuit;

[0025] The gate of the second MOS tube is connected to the output end of the charging voltage detection circuit as the control end of the charging circuit;

[0026] The drain of the second MOS tube is connected to the first end of the first resistor;

[0027] The second end of the first resistor is connected to the anode of the third diode and the first end of the second resistor;

[0028] The cathode of the third diode is connected to the anode of the rechargeable battery as the first output terminal of the charging circuit;

[0029] The second end of the second resistor is connected to the negative electrode of the rechargeable battery as the second output end of the charging circuit.

[0030] In some embodiments, the charging voltage detection circuit includes: a first comparator, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor;

[0031] A first end of the third resistor is connected to the non-inverting input end of the first comparator;

[0032] The second end of the third resistor is connected to the input end of the charging circuit and the second standby power supply as the input end of the charging voltage detection circuit;

[0033] A first end of the fourth resistor is connected to the non-inverting input end of the first comparator;

[0034] The second end of the fourth resistor is grounded;

[0035] A first end of the fifth resistor is connected to the non-inverting input end of the first comparator;

[0036] The second end of the fifth resistor is connected to the output end of the first comparator, and together they serve as the output end of the charging voltage detection circuit and are connected to the control end of the charging circuit;

[0037] A first end of the sixth resistor is connected to an inverting input end of the first comparator;

[0038] The second end of the sixth resistor is connected to the positive electrode of the rechargeable battery as a detection end of the charging voltage detection circuit.

[0039] In some embodiments, the monitoring switch circuit includes: a third MOS tube, a seventh resistor and an eighth resistor;

[0040] The first end of the seventh resistor is connected to the positive electrode of the rechargeable battery and the load switch circuit as the first end of the monitoring switch circuit;

[0041] The second end of the seventh resistor is connected to the source of the third MOS tube;

[0042] The first end of the eighth resistor is connected to the drain of the third MOS tube, and together they serve as the second end of the monitoring switch circuit connected to the first end of the baseboard management controller;

[0043] The gate of the third MOS tube is connected to the second end of the baseboard management controller as the third end of the monitoring switch circuit.

[0044] In some embodiments, it further includes: a ninth resistor and a first capacitor;

[0045] A first end of the ninth resistor is connected to the positive electrode of the rechargeable battery;

[0046] The second end of the ninth resistor is connected to the first end of the first capacitor and the load switch circuit;

[0047] The second terminal of the first capacitor is grounded.

[0048] On the other hand, the present invention further provides an electronic device, comprising the above-mentioned rechargeable battery circuit.

[0049] It can be seen from the above technical scheme that the present invention provides a battery power supply circuit, including: a charging circuit, a rechargeable battery and a load switch circuit; the output end of the charging circuit is connected to the rechargeable battery for charging the rechargeable battery; the load switch circuit includes at least two paths connected to the load, at least one of which includes a switch; the rechargeable battery is connected to the load through the load switch circuit, and is used for the rechargeable battery to power the corresponding load when the switch is turned on. It can be seen that the present invention adds a charging circuit to the battery connection circuit to charge the battery at any time, thereby extending the working time of the battery from the charging aspect; at the same time, the present invention adds a path connecting the load switch circuit to different loads, so that through user selection, when the path is turned on as a whole, the rechargeable battery powers the load corresponding to the path, thereby extending the working time of the battery from the energy saving aspect. In other words, the battery power supply circuit provided by the present invention charges the battery from the charging aspect, increases the battery power, and ensures that the same battery power can support longer work from the energy saving aspect, thereby avoiding the loss of important data. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A circuit diagram of a battery power supply circuit provided by an embodiment of the present invention;

[0052] Figure 2 A button battery circuit provided by the prior art;

[0053] Figure 3 A circuit diagram of a load switch circuit provided by an embodiment of the present invention;

[0054] Figure 4 A structural diagram of a battery power supply circuit provided by an embodiment of the present invention;

[0055] Figure 5 A complete circuit diagram of a battery power supply circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] The terms "including" and "having" in the specification of the present invention and the above-mentioned drawings, as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0058] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0059] Next, a battery power supply circuit provided by an embodiment of the present invention is described in detail. Figure 1 A circuit diagram of a battery power supply circuit provided by an embodiment of the present invention, such as Figure 1 As shown, the battery power supply circuit includes: a charging circuit 1, a rechargeable battery 2 and a load switch circuit 3. In addition, Figure 1 The circuit shown also includes a load 4 and a switch 5. The connection relationship of the circuit is as follows: the output end of the charging circuit 1 is connected to the rechargeable battery 2; the load switch circuit 3 includes at least two paths connected to the load 4, at least one of which includes a switch 5; the rechargeable battery 5 is connected to the load 4 through the load switch circuit 3.

[0060] In a specific embodiment, the design of the conventional button battery is as follows: Figure 2 As shown, it includes: a button battery BY, a first group of loads (RTC), a second group of loads (Other), diodes D11 and D12, resistors R11, R12, R13, and a capacitor C11. Among them. The negative electrode of the button battery BY is grounded; the positive electrode of the button battery BY serves as the first output voltage node 11, and is connected to the first end of the resistor R13; the second end of the resistor R13 serves as the second output voltage node 22, and is connected to the first end of the capacitor C11, the positive electrode of the diode D11 and the first end of the resistor R11; the second end of the capacitor C11 is grounded; the second end of the resistor R11 serves as the third output voltage node 33, which is used for voltage monitoring, and is connected to the first end of the resistor R12; the second end of the resistor R12 is grounded; the negative electrode of the diode D11 serves as the fourth output voltage node 44, and is connected to the negative electrode of the diode D12 and the first group of loads (RTC) and the second group of loads (Other); the positive electrode of the diode D12 is connected to the power supply terminal 55. Its Figure 2The principle of the circuit shown is: when the power supply terminal 55 is started, the diode D12 is turned on and the diode D11 is turned off, and the voltage of the power supply terminal 55 is used to supply power to the first group of loads (RTC) and the second group of loads (Other) through the diode D12; when the power supply terminal 44 is turned off, the diode D12 is turned off and the diode D11 is turned on, and the voltage of the button battery BY is used to supply power to the first group of loads (RTC) and the second group of loads (Other) through the diode D11. Figure 2 The principle of the circuit shown in the figure shows that Figure 2 In the circuit shown, only the button battery BY supplies power to the first group of loads (RTC) and the second group of loads (Other) when the power supply terminal 55 is turned off, and the working time of the button battery BY is limited; at the same time, the loads connected to the circuit are divided into the first group of loads (RTC) and the second group of loads (Other), and there are some loads that are not necessary to run all the time, thereby consuming the power of the button battery BY, thereby reducing the working time of the button battery BY. When the power supply terminal 44 is turned off for a long time, data loss is likely to occur.

[0061] Therefore, the present invention provides a battery power supply circuit, in which a charging circuit 1 is connected to a rechargeable battery 2, and is used to charge the rechargeable battery 2 at any time to increase its power; the rechargeable battery 2 is also connected to a load 4 through a load switch circuit 3, wherein the original load 4 is divided into at least two groups in the present invention, that is, the load switch circuit 3 can be connected to the corresponding load through different paths. At least one of the paths includes a switch 5, and when the switch is turned on, the path is turned on, and the rechargeable battery 2 supplies power to the corresponding load 4.

[0062] It should be noted that the load switch circuit 3 includes at least two paths connected to the load 4, at least one of which includes a switch 5, which specifically includes multiple situations:

[0063] For example, in the first case, the load switch circuit 3 includes at least two paths connected to the load 4, and there is a direct connection path, and the remaining paths all include switches 5. The load 4 connected to the direct connection path is more important, such as a clock, which needs to be running all the time; the load 4 connected to the remaining switch paths are all general loads, and the conduction of the specific switch paths can be adjusted at any time according to the needs of the user to meet the needs of different operators.

[0064] The second case: the load switch circuit 3 includes at least two paths connected to the load 4, and there is at least one direct connection path, and the remaining paths all include switches 5. In this case, the load 4 is divided into important loads and general loads. The important load is connected to the rechargeable battery 2 through the direct connection path, so that the rechargeable battery 2 always supplies power to the important load; the general load is connected to the rechargeable battery 2 through the switch path, and the rechargeable battery 2 supplies power to the general load only when the switch 5 in the path is turned on; in the switch path, it can be adjusted at any time according to the needs of the user to meet the needs of different operators.

[0065] The third situation: the load switch circuit 3 includes at least two paths connected to the load 4, each of which includes a switch 5. In this situation, there is no need to divide the load 4 into important or unimportant ones. According to the needs of the operator, the switches 5 in different switch paths can be turned on at any time so that the rechargeable battery 2 can power the corresponding load 4 to meet the needs of different operators.

[0066] In the fourth case, the load switch circuit 3 includes two paths connected to the load 4, one of which is a direct connection path, and the other path includes a switch 5. In this case, the important loads are divided into one group and the general loads are divided into another group. The important load group is connected to the rechargeable battery 2 through the direct connection path, so that the rechargeable battery 2 always supplies power to the important loads; the general load group is connected to the rechargeable battery 2 through the switch path, and the rechargeable battery 2 supplies power to the general loads only when the switch 5 in the path is turned on. How to divide the important loads and general loads can be set according to the needs of the user.

[0067] It should be noted that the four situations provided in the present invention are only examples, but are not limited to these four situations. They can be adjusted at any time according to user needs, as long as the load switch circuit includes at least two paths connected to the load, and at least one path includes a switch.

[0068] The rechargeable battery 2 may be a rechargeable button battery.

[0069] It can be seen from the above technical scheme that the present invention provides a battery power supply circuit, including: a charging circuit, a rechargeable battery and a load switch circuit; the output end of the charging circuit is connected to the rechargeable battery for charging the rechargeable battery; the load switch circuit includes at least two paths connected to the load, and at least one path includes a switch; the rechargeable battery is connected to the load through the load switch circuit, and the rechargeable battery is used to power the corresponding load when the switch is turned on. It can be seen that the present invention adds a charging circuit to the battery connection circuit to charge the rechargeable battery at any time, and prolongs the working time of the rechargeable battery from the charging aspect; at the same time, the present invention adds a path connected between the load switch circuit and different loads, so that through user selection, when the path is turned on as a whole, the rechargeable battery powers the load corresponding to the path, and prolongs the working time of the rechargeable battery from the energy saving aspect. That is to say, the rechargeable battery power supply circuit provided by the present invention charges the rechargeable battery from the charging aspect, increases the battery power, and ensures that the same power of the rechargeable battery can support longer work from the energy saving aspect, avoiding the loss of important data.

[0070] In some embodiments, the load switch circuit 3 includes two paths connected to the load 4, wherein the first path is a direct connection path, and the second path is a switch path, wherein the switch path includes at least one switch 5. Figure 3 As shown, the direct connection path includes: a first diode D1 and a second diode D2. The connection relationship of the direct connection path is: the positive electrode of the first diode D1 is connected to the positive electrode of the rechargeable battery 2; the negative electrode of the first diode D1 is connected to the negative electrode of the second diode D2, and both are connected to the corresponding load 4; the positive electrode of the second diode D2 is connected to the first standby power supply V1.

[0071] In a specific embodiment, the working principle corresponding to the direct connection path is: when the first standby power supply V1 is powered on (that is, the first standby power supply V1 is currently connected to the AC power supply), the second diode D2 is turned on and the first diode D1 is turned off. The voltage source of the node 300 in the current circuit is the first standby power supply V1, that is, the current first standby power supply V1 supplies power to the connected load 4 through the second diode D2. When the first standby power supply V1 is powered off (that is, the current first standby power supply V1 is unplugged from the AC power supply), the second diode D2 is turned off and the first diode D1 is turned on. Since the voltage of the first standby power supply V1 is 0 at this time, the voltage source of the node 300 in the current circuit is the rechargeable battery 2. In this state, the rechargeable battery 2 is in a discharging state, that is, the current rechargeable battery 2 supplies power to the connected load 4 through the first diode D1. The load 4 connected by the direct connection path can be understood as an important load, a load that needs to be running all the time. It should also be noted that the first standby power supply V1 is specifically a 3.3V standby voltage on the main board.

[0072] The switch path includes: a switch 5, which is a first MOS transistor Q1. The connection relationship of the switch path is: the source of the first MOS transistor Q1 is connected to the cathode of the first diode D1 and the cathode of the second diode D2; the gate of the first MOS transistor Q1 is connected to the power supply 5; the drain of the first MOS transistor Q1 is connected to the corresponding load 4.

[0073] in, Figure 3 The circuit shown includes only one switching path, but multiple identical switching paths can be connected in parallel for timing applications.

[0074] In a specific embodiment, the present invention connects the node 600 in the switch path with the node 300 in the direct connection path. When the first MOS transistor Q1 is turned on, the voltage of the node 600 is the same as the voltage of the node 300; when the first MOS transistor Q1 is turned off, the voltage of the node 600 is zero. When the first standby power supply V1 is powered on, in addition to supplying power to the load 4 connected thereto through the second diode D2, the load 4 connected thereto is also supplied power through the first MOS transistor Q1 that is turned on; when the first standby power supply V1 is powered off, the first MOS transistor Q1 is turned off, and the load 4 connected thereto is also powered off, thereby reducing the power consumption of the rechargeable battery 2. In addition, whether the first MOS transistor Q1 is turned on or not is controlled by the power supply 5. When the first standby power supply V1 is powered off, the Power OK signal sent by the power supply 5 is pulled low, thereby turning off the first MOS transistor Q1; when the first standby power supply V1 is powered on, the Power OK signal sent by the power supply 5 is pulled high, thereby turning on the first MOS transistor Q1. Among them, the load 4 connected to the switch path can be understood as a general load.

[0075] In addition, a control selector can be added, the output end of which is connected to the power supply 5, and the input end of the control selector is a display screen, which is used to receive the operator's instructions and convert the operator's instructions into signals output to the power supply 5, so that the power supply 5 controls the conduction or shutdown of each first MOS tube Q1.

[0076] Alternatively, the control selector is connected to the rechargeable battery 2 in addition to the power supply 5, so as to obtain the power level of the rechargeable battery 2 in real time, and automatically adjust and output the on or off signal of the first MOS tube Q1 to the power supply 5 in real time, and after adjustment, display it to the operator through the display screen.

[0077] However, it should be noted that during the automatic adjustment process, the operator needs to set the priorities of different loads in advance, so that during the automatic adjustment process, when the power of the rechargeable battery 2 is low, the load circuit with a lower priority is turned off first.

[0078] It should be noted that the embodiment provided by the present invention is only one possible implementation method, but is not limited to only this implementation method and can be set according to the needs of the user.

[0079] The present invention provides a path for connecting a load switch circuit to a load. Under this path, a general load is selected by a user, and a rechargeable battery supplies power to the load, thereby ensuring that the same amount of power in the rechargeable battery can support a longer working time from the energy-saving aspect, thereby avoiding the loss of important data.

[0080] In some embodiments, in combination Figure 1 In the circuit shown, Figure 4 As shown, the battery power supply circuit also includes: a charging voltage detection circuit 6, a monitoring switch circuit 7 and a redundant circuit 8. The connection relationship of the current battery power supply circuit is: the output end of the charging voltage detection circuit 6 is connected to the control end of the charging circuit 1; the monitoring switch circuit 7 is connected to the rechargeable battery 2 and the load switch circuit 3, and is used to monitor whether the voltage corresponding to the rechargeable battery 2 is abnormal; the redundant circuit 8 is connected in parallel to the rechargeable battery 2, and is used to replace the rechargeable battery 2 to power the load 4 when the voltage corresponding to the rechargeable battery 2 is abnormal.

[0081] In a specific embodiment, charging the rechargeable battery 2 regardless of the amount of power in the rechargeable battery 2 will affect the life of the rechargeable battery 2. Therefore, a charging voltage detection circuit 6 is added to the battery power supply circuit. The output end of the charging voltage detection circuit 6 is connected to the control end of the charging circuit 1, and is mainly used to monitor the power of the rechargeable battery 2. When the power of the rechargeable battery 2 is lower than a preset value, a charging signal is sent to the control end of the charging circuit 1 through the output end of the charging voltage detection circuit 6, thereby starting the charging circuit 1 to charge the rechargeable battery 2.

[0082] In the normal operation of the circuit, in order to ensure that a fault in the rechargeable battery 2 is discovered in time and to avoid the circuit continuing to operate normally when the rechargeable battery 2 fails, a monitoring switch circuit 7 and a redundant circuit 8 are added to the circuit. The monitoring switch circuit 7 is used to monitor whether the voltage corresponding to the rechargeable battery 2 is abnormal; when the voltage corresponding to the rechargeable battery 2 is abnormal, the redundant circuit 8 replaces the rechargeable battery 2 to power the load 4.

[0083] The redundant circuit 8 may be a rechargeable button battery.

[0084] Meanwhile, it should be noted that the present invention does not limit the specific structures of the charging voltage detection circuit 6 , the monitoring switch circuit 7 and the redundant circuit 8 , and they can be set according to the needs of the user.

[0085] It should also be noted that the embodiment provided by the present invention is only one possible implementation method, but is not limited to only this implementation method and can be set according to the needs of the user.

[0086] The present invention provides a complete battery power supply circuit, which includes: a charging circuit, a rechargeable battery, a load switch circuit, a charging voltage detection circuit, a monitoring switch circuit and a redundant circuit. In addition to charging the rechargeable battery and increasing the power of the rechargeable battery, the circuit can also ensure that the same power of the rechargeable battery can support a longer working time and avoid the loss of important data from the energy saving aspect, and further ensure the normal operation of the circuit and the life of the rechargeable battery.

[0087] In some embodiments, Figure 5 As shown, the charging circuit 1 includes: a second MOS transistor Q2, a first resistor R1, a second resistor R2 and a third diode D3. The connection relationship of the circuit is: the source of the second MOS transistor Q2 is connected to the second standby power supply V2 as the input end of the charging circuit 1; the gate of the second MOS transistor Q2 is connected to the output end of the charging voltage detection circuit 6 as the control end of the charging circuit 1; the drain of the second MOS transistor Q1 is connected to the first end of the first resistor R1; the second end of the first resistor R1 is connected to the positive electrode of the third diode D3 and the first end of the second resistor R2; the negative electrode of the third diode D3 is connected to the positive electrode of the rechargeable battery 2 as the first output end of the charging circuit 1; the second end of the second resistor R2 is connected to the negative electrode of the rechargeable battery 2 as the second output end of the charging circuit 1.

[0088] In a specific embodiment, the second MOS transistor Q2, the first resistor R1, the second resistor R2 and the third diode D3 constitute a charging circuit 1. The circuit principle under this structure is: the second MOS transistor Q2 is a switch that controls the charging circuit 1. When the second MOS transistor Q2 is turned on, the voltage of the second standby power supply V2 is output to the node 105 through the second MOS transistor Q2 and the first resistor R1, and then the rechargeable battery 2 is charged through the third diode D3; when the second MOS transistor Q2 is turned off, the voltage of the node 105 in the circuit is 0V, and due to the unidirectional conductivity of the third diode D3, the voltage of the node 100 can be prevented from being discharged in the reverse direction through the first resistor R1 and the second resistor R2.

[0089] It should be noted that when the second MOS transistor Q2 is turned on, the voltage of the second standby power source V2 is output to the node 105 through the second MOS transistor Q2 and the first resistor R1 only when the second standby power source V2 is powered on.

[0090] The second standby power source V2 is a 5V standby power source.

[0091] In some embodiments, Figure 5As shown, the charging voltage detection circuit 6 includes: a first comparator U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6. The connection relationship of the electronic components inside the charging voltage detection circuit 6 is as follows: the first end of the third resistor R3 is connected to the non-inverting input end of the first comparator U1; the second end of the third resistor R3 is connected to the input end of the charging circuit 1 and the second standby power supply V2 as the input end of the charging voltage detection circuit 6; the first end of the fourth resistor R4 is connected to the non-inverting input end of the first comparator U1; the second end of the fourth resistor R2 is grounded; the first end of the fifth resistor R5 is connected to the non-inverting input end of the first comparator U1; the second end of the fifth resistor R5 is connected to the output end of the first comparator U1, and together as the output end of the charging voltage detection circuit 6 connected to the control end of the charging circuit 1; the first end of the sixth resistor R6 is connected to the inverting input end of the first comparator U1; the second end of the sixth resistor R6 is connected to the positive electrode of the rechargeable battery 2 as the detection end of the charging voltage detection circuit 6.

[0092] In a specific embodiment, the first comparator U1, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 constitute a charging voltage monitoring circuit 6. The principle of the charging voltage detection circuit 6 under this structure is: the third resistor R3 and the fourth resistor R4 are connected in series to the voltage division of the second standby power supply V2 to obtain node 102 as a reference voltage, which is the set charging cut-off voltage, and the sixth resistor R6 is a remote voltage sampling resistor, which samples the voltage of the output node 400 of the rechargeable battery 2 to obtain node 103 (battery sampling voltage). When the voltage of node 103 in the circuit is lower than the voltage of node 102, the first comparator U1 outputs a high-level signal, and the node is 104 at this time, the second MOS tube Q2 is turned on, and the charging circuit 1 starts to work; when the voltage of node 103 is higher than the voltage of node 102, the first comparator U1 outputs a low-level signal, the second MOS tube Q2 is turned off, and the charging circuit 1 stops working. Among them, the fifth resistor R5 in the circuit is a hysteresis resistor. When the node 104 is at a high level during the charging process, the voltage of the node 102 will be raised to V11+ΔV through the fifth resistor R5, wherein V11 is the voltage of the node 102 divided by the third resistor R3, the fourth resistor R4 and the fifth resistor R5 when the node 104 is at a low level of 0V, and ΔV is the voltage portion of the node 102 raised by the voltage division of the fifth resistor R5 when the node 104 is at a high level. When charging starts, after the voltage of the node 102 rises to V11+ΔV, the first comparator U1 outputs a low level, the second MOS tube Q2 is turned off, and the charging circuit 1 stops working. At this time, the voltage of the node 102 drops to V11. When the voltage of the rechargeable battery 2 drops after a long period of operation, and the voltage of the node 102 drops below V11, the first comparator U1 outputs a high level, and at this time, the second MOS tube Q2 is turned on to restart the charging circuit 1 to start recharging the rechargeable battery 2. The fifth resistor R2 is used to increase the charging cut-off voltage and the recharging voltage of the charging circuit 1 by ΔV, so as to prevent the rechargeable battery 2 from being frequently charged and thus shortening the life of the rechargeable battery 2 .

[0093] In some embodiments, Figure 5 As shown, the monitoring switch circuit 7 includes: a third MOS transistor Q3, a seventh resistor R7 and an eighth resistor R8. The connection relationship of the electronic components inside the monitoring switch circuit 7 is as follows: the first end of the seventh resistor R7 is connected to the positive electrode of the rechargeable battery 2 and the load switch circuit 3 as the first end of the monitoring switch circuit 7; the second end of the seventh resistor R7 is connected to the source of the third MOS transistor Q3; the first end of the eighth resistor R8 is connected to the drain of the third MOS transistor Q3, and together they are connected to the first end of the baseboard management controller 9 as the second end of the monitoring switch circuit 7; the gate of the third MOS transistor Q3 is connected to the second end of the baseboard management controller 9 as the third end of the monitoring switch circuit 7.

[0094] In a specific embodiment, the third MOS transistor Q3, the seventh resistor R7 and the eighth resistor R8 constitute a monitoring switch circuit 7. The gate of the third MOS transistor Q3 is the node 106. When the baseboard management controller 9 wants to monitor the voltage of the rechargeable battery 2, the signal of the node 106 is pulled high, and the third MOS transistor Q3 is turned on. Then, the voltage at the node 101 is judged at this time, and the signal of the node 101 is output to the baseboard management controller 9 to monitor the voltage of the rechargeable battery 2. After the monitoring is completed, the baseboard management controller 9 will pull the voltage of the node 106 down to 0V, and the third MOS transistor Q3 is turned off. Then the eighth resistor R8 will be disconnected from the circuit, and the seventh resistor R7 and the eighth resistor R8 will no longer consume the power of the node 400. In order to better save power, the node 106 is kept at a low level for a long time, and the voltage monitoring switch circuit 7 is kept closed for a long time.

[0095] The voltage at the node 101 is the voltage divided value of the node 400 after the seventh resistor R7 and the eighth resistor R8 are connected in series.

[0096] besides, Figure 5 The circuit structure shown also includes: a ninth resistor R9 and a first capacitor C1. The connection relationship of the circuit is: the first end of the ninth resistor R9 is connected to the positive electrode of the rechargeable battery 2; the second end of the ninth resistor R9 is connected to the first end of the first capacitor C1 and the load switch circuit 3; the second end of the first capacitor C1 is grounded.

[0097] In a specific embodiment, the ninth resistor R9 is used for current limiting, and the first capacitor C1 is used for filtering. The voltage at the node 400 is the voltage of the rechargeable battery 2 after passing through the ninth resistor R9.

[0098] Among them, it should be noted that Figure 5 In the circuit shown, the load switch circuit 3 includes two paths connected to the load 4, wherein the first path is a direct connection path and the second path is a switch path.

[0099] It should be noted that the charging circuit 1, charging voltage detection circuit 6 and monitoring switch circuit 7 provided by the present invention are only one possible implementation method, but are not limited to only this implementation method and can be set according to user needs.

[0100] It can be seen that the complete battery power supply circuit includes: a rechargeable battery 2, a first diode D1, a second diode D2, a first MOS transistor Q1, a second MOS transistor Q2, a first resistor R1, a second resistor R2, a third diode D3, a first comparator U1, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a third MOS transistor Q3, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a first capacitor C1. In this structure, the first diode D1 and the second diode D2 form a direct connection path; the first MOS transistor Q1 forms a switch path; the second MOS transistor Q2, the first resistor R1, the second resistor R2 and the third diode D3 form a charging circuit 1; the first comparator U1, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 form a charging voltage monitoring circuit 6; the third MOS transistor Q3, the seventh resistor R7 and the eighth resistor R8 form a monitoring switch circuit 7.

[0101] In this circuit, the battery powered circuit has the following advantages:

[0102] 1. Its direct connection path and switch path ensure that the same amount of power in the rechargeable battery can support longer working time from the perspective of energy saving, thus avoiding the loss of important data.

[0103] 2. The charging circuit extends the working time of the rechargeable battery from the charging aspect.

[0104] 3. The charging voltage detection circuit prevents damage to the rechargeable battery caused by long-term charging or overcharging.

[0105] 4. Monitoring switch circuits and redundant circuits can ensure the normal operation of the circuit.

[0106] 5. The monitoring switch circuit changes the voltage monitoring of the rechargeable battery from continuous monitoring to intermittent monitoring to reduce power consumption.

[0107] On the other hand, the present invention further provides an electronic device, comprising the above-mentioned rechargeable battery circuit, wherein, since the embodiments provided by the present invention are the same as the embodiments of the above-mentioned electronic device, the present invention will not be described in detail here.

[0108] In an electronic device, it includes: a charging circuit, a rechargeable battery and a load switch circuit; the output end of the charging circuit is connected to the rechargeable battery for charging the rechargeable battery; the load switch circuit includes at least two paths connected to the load, at least one of which includes a switch; the rechargeable battery is connected to the load through the load switch circuit, and is used to power the corresponding load when the switch is turned on when the rechargeable battery is powered. It can be seen that the present invention adds a charging circuit to charge the rechargeable battery at any time, which can extend the working time of the rechargeable battery from the charging aspect; at the same time, the present invention adds a path connecting the load switch to different loads, so that through user selection, when the path is turned on as a whole, the rechargeable battery can power the load corresponding to the path, which can extend the working time of the rechargeable battery from the energy saving aspect. That is to say, the battery power supply circuit provided by the present invention can charge the rechargeable battery from the charging aspect, increase the battery power, and ensure that the same power of the rechargeable battery can support longer work from the energy saving aspect, avoiding the loss of important data.

[0109] The above is a detailed introduction to a battery-powered circuit and an electronic device provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A battery powered circuit, characterized in that: include: Charging circuit, rechargeable battery and load switch circuit; The output end of the charging circuit is connected to the rechargeable battery, and is used to charge the rechargeable battery; The load switch circuit includes at least two paths connected to the load, at least one of the paths includes a switch; The rechargeable battery is connected to the load through the load switch circuit, so that the rechargeable battery can supply power to the corresponding load when the switch is turned on.

2. The battery powered circuit according to claim 1, characterized in that: The load switch circuit includes two paths connected to the load, wherein the first path is a direct connection path, and the second path is a switch path, wherein the switch path includes at least one switch.

3. The battery powered circuit according to claim 2, characterized in that: The direct connection path includes: a first diode and a second diode; The positive electrode of the first diode is connected to the positive electrode of the rechargeable battery; The cathode of the first diode is connected to the cathode of the second diode, and both are connected to the corresponding load; An anode of the second diode is connected to the first standby power supply.

4. The battery powered circuit according to claim 3, characterized in that: The switch path includes: a switch, which is a first MOS tube; The source electrode of the first MOS tube is connected to the cathode electrode of the first diode and the cathode electrode of the second diode; The gate of the first MOS tube is connected to a power supply; The drain of the first MOS tube is connected to the corresponding load.

5. The battery powered circuit according to claim 1, characterized in that: It also includes: a charging voltage detection circuit, a monitoring switch circuit and a redundant circuit; The output end of the charging voltage detection circuit is connected to the control end of the charging circuit, and is used to control the charging circuit to charge the rechargeable battery; The monitoring switch circuit is connected to the rechargeable battery and the load switch circuit, and is used to monitor whether the voltage corresponding to the rechargeable battery is abnormal; The redundant circuit is connected in parallel to the rechargeable battery, and is used to replace the rechargeable battery to supply power to the load when an abnormality occurs in the voltage corresponding to the rechargeable battery.

6. The battery powered circuit according to claim 5, characterized in that: The charging circuit comprises: a second MOS tube, a first resistor, a second resistor and a third diode; Wherein, the source of the second MOS tube is connected to the second standby power supply as the input end of the charging circuit; The gate of the second MOS tube is connected to the output end of the charging voltage detection circuit as the control end of the charging circuit; The drain of the second MOS tube is connected to the first end of the first resistor; The second end of the first resistor is connected to the anode of the third diode and the first end of the second resistor; The cathode of the third diode is connected to the anode of the rechargeable battery as the first output terminal of the charging circuit; The second end of the second resistor is connected to the negative electrode of the rechargeable battery as the second output end of the charging circuit.

7. The battery powered circuit according to claim 5, characterized in that: The charging voltage detection circuit comprises: a first comparator, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; A first end of the third resistor is connected to a non-inverting input end of the first comparator; The second end of the third resistor is connected to the input end of the charging circuit and the second standby power supply as the input end of the charging voltage detection circuit; A first end of the fourth resistor is connected to a non-inverting input end of the first comparator; The second end of the fourth resistor is grounded; A first end of the fifth resistor is connected to a non-inverting input end of the first comparator; The second end of the fifth resistor is connected to the output end of the first comparator, and together serves as the output end of the charging voltage detection circuit and is connected to the control end of the charging circuit; The first end of the sixth resistor is connected to the inverting input end of the first comparator; The second end of the sixth resistor is connected to the positive electrode of the rechargeable battery as a detection end of the charging voltage detection circuit.

8. The battery powered circuit according to claim 5, characterized in that: The monitoring switch circuit comprises: a third MOS tube, a seventh resistor and an eighth resistor; The first end of the seventh resistor is connected to the positive electrode of the rechargeable battery and the load switch circuit as the first end of the monitoring switch circuit; The second end of the seventh resistor is connected to the source of the third MOS tube; The first end of the eighth resistor is connected to the drain of the third MOS tube, and together they serve as the second end of the monitoring switch circuit connected to the first end of the baseboard management controller; The gate of the third MOS tube is connected to the second end of the baseboard management controller as the third end of the monitoring switch circuit.

9. The battery powered circuit according to any one of claims 1 to 9, characterized in that: Also includes: a ninth resistor and a first capacitor; The first end of the ninth resistor is connected to the positive electrode of the rechargeable battery; The second end of the ninth resistor is connected to the first end of the first capacitor and the load switch circuit; The second terminal of the first capacitor is grounded.

10. An electronic device, characterized in that: A rechargeable battery circuit comprising any one of claims 1-9.

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