Power supply control circuit, device, equipment and system

Abstract

The embodiment of the invention provides a power supply control circuit, device, equipment and system, relates to the technical field of power supply control, and is used for solving the technical problem that a main and auxiliary battery power supply technology is difficult to adapt to electronic equipment with a large-current load, and the power supply control circuit is applied to a power supply loop which supplies power to the load through a main power supply source and an auxiliary power supply source. The main power supply is connected with the load. The power supply control circuit comprises a control module and a switch module. Wherein the first end of the control module is connected with the power supply end of the main power supply, the second end of the control module is connected with the power supply end of the auxiliary power supply, the third end of the control module is connected with the first end of the switch module, and the second end of the switch module is connected with the load; internal resistance of the switch module is smaller than a preset value. The control module is used for controlling the switch module to be switched on when the first power supply voltage is larger than or equal to the second power supply voltage and the voltage difference between the first power supply voltage and the second power supply voltage is smaller than or equal to a preset voltage difference threshold value so as to switch on a power supply loop of the auxiliary power supply and the load.

Description

Technical Field

[0001] The present application relates to the field of power supply control, and in particular, to a power supply control circuit, device, equipment, and system. Background Art

[0002] With the wide application of electronic devices, more and more electronic devices require multiple batteries to be connected in parallel to increase power output and extend the usage time. For example, electric bicycles and electric motorcycles, robot products, quick battery swapping products, power tools, consumer electronic products, etc.

[0003] Currently, some electronic devices with multiple batteries connected in parallel use the main and auxiliary battery power supply technology to supply power to the loads on the electronic devices. However, this power supply method is difficult to be applicable to electronic devices with large current loads. Summary of the Invention

[0004] The present application provides a power supply control circuit, device, equipment, and system, which are used to solve the problem that electronic devices with multiple batteries connected in parallel are difficult to be applicable to electronic devices with large current loads.

[0005] To achieve the above object, the embodiments of the present application provide the following technical solutions:

[0006] In a first aspect, the embodiments of the present application provide a power supply control circuit. The power supply control circuit is applied to a power supply loop that supplies power to a load through a main power supply and an auxiliary power supply, wherein the main power supply is connected to the load.

[0007] The power supply control circuit includes: a control module and a switch module; wherein, a first end of the control module is connected to a power supply end of the main power supply, a second end of the control module is connected to a power supply end of the auxiliary power supply, a third end of the control module is connected to a first end of the switch module, and a second end of the switch module is connected to the load; the internal resistance of the switch module is less than a preset value.

[0008] The control module is configured to control the switch module to conduct when a first supply voltage is greater than or equal to a second supply voltage and the voltage difference between the two is less than or equal to a preset voltage difference threshold, so as to conduct the power supply loop between the auxiliary power supply and the load.

[0009] In the above power supply control circuit, optionally, the control module includes: a first voltage detection unit, a second voltage detection unit, a control unit, and a driving unit.

[0010] A first end of the first voltage detection unit is the first end of the control module, a first end of the second voltage detection unit is the second end of the control module, and a second end of the first voltage detection unit is connected to a first end of the control unit; a second end of the second voltage detection unit is connected to a second end of the control unit, a third end of the control unit is connected to a first end of the driving unit, and a second end of the driving unit is the third end of the control module.

[0011] The first voltage detection unit is used to sample the first supply voltage of the main power supply.

[0012] The second voltage detection unit is used to sample the second supply voltage of the secondary power supply.

[0013] The control unit is used for:

[0014] When the first supply voltage is greater than or equal to the second supply voltage and the voltage difference between the two is less than or equal to the preset voltage difference threshold, send a first drive signal to the drive unit to enable the drive unit to control the switch module to conduct.

[0015] When the first supply voltage is less than the second supply voltage, or when the first supply voltage is greater than the second supply voltage and the voltage difference between the two is greater than the preset voltage difference threshold, send a second drive signal to the drive unit to enable the drive unit to control the switch module to disconnect.

[0016] In the above power supply control circuit, optionally, the control unit includes: a comparison sub-unit and a logic processing sub-unit.

[0017] The first end of the comparison sub-unit is the first end of the control unit, the second end is the second end of the control unit, the third end of the comparison sub-unit is connected to the first end of the logic processing sub-unit, and the second end of the logic processing sub-unit is the third end of the control unit.

[0018] The comparison sub-unit is used to output a first signal and a second signal according to the first supply voltage and the second supply voltage; the first signal is used to represent the magnitude relationship between the first supply voltage and the second supply voltage, and the second signal is used to represent the relationship between the voltage difference between the first supply voltage and the second supply voltage and the preset voltage difference threshold.

[0019] The logic processing sub-unit is used to output a first drive signal or a second drive signal according to the first signal and the second signal.

[0020] In the above power supply control circuit, optionally, the switch module includes: a disconnector. The disconnector is used to conduct based on the first drive signal or turn off based on the second drive signal.

[0021] In the above power supply control circuit, optionally, the drive unit includes: a waveform generator and a drive bootstrap sub-unit.

[0022] The first end of the waveform generator is the first end of the drive unit, the second end of the waveform generator is connected to the first end of the drive bootstrap sub-unit, and the second end of the drive bootstrap sub-unit is the second end of the drive unit.

[0023] A waveform generator, configured to send a square wave signal to a driving bootstrap sub-unit when receiving a first driving signal, and stop sending the square wave signal to the driving bootstrap sub-unit when receiving a second driving signal.

[0024] A driving bootstrap sub-unit, configured to output a high-level signal to drive a disconnecting switch to conduct when receiving the square wave signal.

[0025] In the above power supply control circuit, optionally, the driving unit further includes: a driving signal amplification sub-unit.

[0026] The second end of the waveform generator is connected to the first end of the driving signal amplification sub-unit, and the second end of the driving signal amplification sub-unit is connected to the first end of the driving bootstrap sub-unit. The driving signal amplification sub-unit is configured to amplify the square wave signal.

[0027] In the above power supply control circuit, optionally, the control module includes: a power supply unit.

[0028] The first end of the power supply unit is connected to the power supply end of the main power supply and / or the power supply end of the secondary power supply. The second end of the power supply unit is respectively connected to the power supply end of the first voltage detection unit, the power supply end of the second voltage detection unit, the power supply end of the control unit, and the power supply end of the driving unit, for providing power supply.

[0029] In a second aspect, an embodiment of the present application provides a power supply device. The power supply device includes: a main power supply, a secondary power supply, and a power supply control circuit as in the first aspect.

[0030] In a third aspect, an embodiment of the present application provides a power supply equipment. The power supply equipment includes: a main power supply, a secondary power supply, a load, and a power supply control circuit as in the first aspect.

[0031] In a fourth aspect, an embodiment of the present application provides a power supply system. The power supply system includes: a main power supply, a secondary power supply, a load, and a power supply control circuit as in the first aspect.

[0032] The power supply control circuit, device, equipment and system provided by the present application have the following technical effects: The power supply control circuit can be realized by an analog circuit and a digital circuit, without additionally setting a software control program to implement the above control. It can be applied to electronic devices with large current loads, and avoid the risk of abnormal operation easily existing in the software control program, thereby improving the stability of the power supply. Description of the Drawings

[0033] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 Schematic diagram of a power supply control circuit provided by an embodiment of the present application;

[0035] Figure 2 Schematic diagram of a control module provided by an embodiment of the present application;

[0036] Figure 3 Schematic diagram of another control module provided by an embodiment of the present application;

[0037] Figure 4 Schematic diagram of a control unit provided by an embodiment of the present application;

[0038] Figure 5 Schematic diagram of a comparison sub-unit provided by an embodiment of the present application;

[0039] Figure 6 Schematic diagram of a logic processing sub-unit provided by an embodiment of the present application;

[0040] Figure 7 Schematic diagram of a driving unit provided by an embodiment of the present application;

[0041] Figure 8 Schematic diagram of a waveform generator provided by an embodiment of the present application;

[0042] Figure 9 Schematic diagram of a driving bootstrap sub-unit and a switching module provided by an embodiment of the present application;

[0043] Figure 10 Schematic diagram of a driving signal amplification sub-unit provided by an embodiment of the present application. Detailed implementation manners

[0044] For an electronic device with multiple batteries in parallel, the main and auxiliary battery power supply technology can be adopted to supply power to the load on the electronic device. The main and auxiliary battery power supply technology refers to a technology in which the main battery is connected to the load, and the auxiliary battery can be connected to the load under certain conditions to jointly supply power to the load.

[0045] Currently, the main power supply circuits for the main and auxiliary battery power supply technology adopted by electronic devices with multiple batteries in parallel are mainly as follows:

[0046] (1) The main battery is connected to the load through a diode, and the secondary battery is also connected to the load through a diode.

[0047] This circuit structure is simple and low in cost. However, due to the large power loss of the diode, there are problems of low power efficiency for both the main battery and the secondary battery in this power supply circuit. In addition, when supplying power to a large-current load, the diode generates serious heat, making it difficult to be applied to electronic devices with large-current loads.

[0048] (2) The main battery is directly connected to the load, and the secondary battery is connected to the load through a diode.

[0049] This technology has problems such as low power efficiency of the secondary battery and serious heat generation of the diode, making it difficult to be used in large-current loads. Moreover, there may be a situation where the secondary battery charges the main battery, and the large current generated may damage the secondary battery.

[0050] (3) In addition to the main battery and the secondary battery in the power supply circuit, a power management unit formed by a power management chip is newly added. When the voltage or power of the main battery is low, the power management unit switches the power supply for the load from the main battery to the secondary battery.

[0051] This technology has a risk of sudden current drop during the switching between the main and secondary batteries, that is, it is not applicable to electronic devices with large-current loads during the switching between the main and secondary batteries.

[0052] In summary, the existing power supply circuits using the main and secondary battery power supply technology are difficult to be applied to electronic devices with large-current loads.

[0053] In view of this, the embodiments of the present application provide a power supply control circuit that can be applied to electronic devices with large-current loads.

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0055] Figure 1 It is a schematic structural diagram of a power supply control circuit provided by an embodiment of the present application. As Figure 1 shown, this power supply control circuit is applied to a power supply loop that supplies power to a load through a main power supply and a secondary power supply.

[0056] The main power supply and the secondary power supply can be any energy storage device capable of powering a load. For example, it can be a battery, or a battery pack, or an energy storage capacitor, etc. Optionally, the main power supply and the secondary power supply can be of the same type of power supply, or different types of power supplies. When the two are of the same type of power supply, they can be of the same material or different materials. Taking the case where both the main power supply and the secondary power supply are batteries as an example, the main power supply can be a lithium-ion battery, and the secondary power supply can be a disposable battery, or both the main power supply and the secondary power supply are lithium-ion batteries, etc.

[0057] The main power supply is connected to the load. For example, the positive electrode of the main power supply is connected to the first terminal of the power supply end of the load, and the negative electrode of the main power supply is directly connected to the second terminal of the power supply end of the load, forming the main power supply circuit of the load for providing the first supply voltage to the load.

[0058] The power supply control circuit includes: a control module and a switch module; wherein, the first end of the control module is connected to the power supply end of the main power supply, the second end of the control module is connected to the power supply end of the secondary power supply, the third end of the control module is connected to the first end of the switch module, and the second end of the switch module is connected to the load, forming the secondary power supply circuit of the load for providing the second supply voltage to the load.

[0059] The above Figure 1 Only an exemplary schematic diagram of the connection between the positive electrode of the main power supply and the first terminal of the power supply end of the load, and the connection between the positive electrode of the secondary power supply and the first terminal of the power supply end of the load is given. It should be understood that the negative electrodes of both are directly connected to the second terminal of the power supply end of the load, and no new module is added to the connection path between the negative electrodes of both and the second terminal of the power supply end of the load. Therefore, for the connection path between the negative electrodes of both and the second terminal of the power supply end of the load, Figure 1 is not shown.

[0060] In this embodiment, the control module can be any module that can control the main and secondary power supplies to power the load based on the first supply voltage of the main power supply and the second supply voltage of the secondary power supply. This module can be implemented, for example, through analog circuits and digital circuits.

[0061] The control module is used to control the switch module to conduct when the first supply voltage is greater than or equal to the second supply voltage and the voltage difference between the two is less than or equal to a preset voltage difference threshold, so as to conduct the power supply circuit between the secondary power supply and the load. That is, when the supply voltages provided by the main power supply and the secondary power supply are similar, the main power supply and the secondary power supply are used to power the load simultaneously.

[0062] Since the positive electrodes are all connected to the first terminal of the power supply end of the load, and the negative electrodes are all directly connected to the second terminal of the power supply end of the load. Therefore, the main power supply and the secondary power supply are equivalent to supplying power to the load in a parallel manner. This parallel method can increase the current input to the load, that is, the load can consume the power of the main power supply and the secondary power supply simultaneously, so that it can be applied to electronic devices with large current loads.

[0063] Correspondingly, when the above conditions are not met between the first supply voltage and the second supply voltage, that is, when the supply voltages provided by the main power supply and the secondary power supply differ greatly, the control module can control the switch module to turn off to disconnect the power supply circuit of the secondary power supply from the load. For example, the first supply voltage of the main power supply is less than the second supply voltage of the secondary power supply, or the first supply voltage is greater than the second supply voltage and the voltage difference between them is greater than the preset voltage difference threshold.

[0064] In this way, it is possible to avoid damage to the power supply with a smaller voltage caused by a large difference in supply voltages, such as current backflow.

[0065] It should be understood that the above preset threshold can be determined according to the specifications and parameters of the main power supply and the secondary power supply. For example, the minimum value of the voltage difference that can be tolerated by both. Taking the case where the voltage difference tolerated by the main power supply is less than that tolerated by the secondary power supply as an example, the above preset threshold can be the voltage difference tolerated by the main power supply or a value less than this voltage difference.

[0066] In addition, the internal resistance of the switch module involved in the embodiments of the present application is less than a preset value. Therefore, by applying such a switch module to the power supply circuit that supplies power to the load through the main power supply and the secondary power supply, the power supply circuit can be applied to electronic devices with large current loads.

[0067] Optionally, the switch module may include one or more switches, and the number of switch devices is related to the internal resistance value of the switch module. Therefore, the number of switches in the switch module can be determined or set according to the current in the power supply circuit applied by the power supply control circuit. Among them, the greater the current, the more switch devices are required. In this way, extremely low internal resistance and extremely low power consumption can be achieved.

[0068] Exemplarily, the switch module may include, for example, at least one disconnect switch with an internal resistance less than a preset value, such as an NMOS disconnect switch, etc. The switch module may include multiple switch devices, such as NMOS transistors.

[0069] Next, the structure of the control module will be illustrated by examples.

[0070] Figure 2 This is a schematic diagram of the structure of a control module provided by an embodiment of the present application. As Figure 2As shown, the control module may include: a first voltage detection unit, a second voltage detection unit, a control unit, and a driving unit.

[0071] Among them, the first end of the first voltage detection unit is the first end of the control module, the first end of the second voltage detection unit is the second end of the control module, and the second end of the first voltage detection unit is connected to the first end of the control unit; the second end of the second voltage detection unit is connected to the second end of the control unit, the third end of the control unit is connected to the first end of the driving unit, and the second end of the driving unit is the third end of the control module.

[0072] The first voltage detection unit is used to sample the first power supply voltage of the main power supply, and the second voltage detection unit is used to sample the second power supply voltage of the secondary power supply.

[0073] The control unit is used to send a first driving signal to the driving unit when the first power supply voltage is greater than or equal to the second power supply voltage and the voltage difference between the two is less than or equal to a preset voltage difference threshold, so that the driving unit controls the switch module to conduct.

[0074] Optionally, the control module may further include: a power supply unit. The first end of the power supply unit is connected to the power supply end of the main power supply and / or the power supply end of the secondary power supply, and the second end of the power supply unit is respectively connected to the power supply end of the first voltage detection unit, the power supply end of the second voltage detection unit, the power supply end of the control unit, and the power supply end of the driving unit, and is used to supply power to other units in the control module. The power supply unit circuit may be, for example, a general buck circuit, which is implemented by an analog circuit and will not be described in detail here.

[0075] The following will separately describe each unit.

[0076] (1) The first voltage detection unit and the second voltage detection unit

[0077] These two voltage detection units may be, for example, any circuit that realizes voltage detection through an analog circuit. Specifically, the structures of the two voltage detection units may be the same to improve the sampling accuracy.

[0078] Figure 3 For another structural schematic diagram of the control module provided by the embodiment of the present application. As Figure 3 shown, exemplarily, the first voltage detection unit may include, for example: a voltage dividing circuit composed of an operational amplifier U4, a resistor R21, and a resistor R23.

[0079] One end of the resistor R21 is the first end of the first voltage detection unit. The voltage division circuit composed of the resistor R21 and the resistor R23 is used to sample the voltage of the main power supply P1. The output end of the operational amplifier U4 is connected to one of the input ends of the operational amplifier U4 to form a voltage follower with high input impedance, so as to isolate the influence of the control unit on the above voltage division circuit.

[0080] The sampling voltage BAT1_V corresponding to the first supply voltage obtained through the above sampling is less than the first supply voltage of the main power supply. This sampling voltage BAT1_V can be applicable to the operating voltage of the voltage follower.

[0081] The second voltage detection unit may include, for example, an operational amplifier U5 and a voltage division circuit composed of a resistor R22 and a resistor R24.

[0082] One end of the resistor R22 is the first end of the second voltage detection unit. The voltage division circuit composed of the resistor R22 and the resistor R24 is used to sample the secondary power supply P2. The output end of the operational amplifier U5 is connected to one of the input ends of the operational amplifier U5 to form a voltage follower with high input impedance, so as to isolate the influence of the control unit on the above voltage division circuit.

[0083] The sampling voltage BAT2_V corresponding to the second supply voltage obtained through the above sampling is less than the second supply voltage of the secondary power supply. This sampling voltage BAT1_V can be applicable to the operating voltage of the voltage follower.

[0084] (2) Control unit

[0085] The control unit can be implemented by, for example, an analog circuit and a digital circuit. The control unit is used to perform the following operations:

[0086] When the first supply voltage is greater than or equal to the second supply voltage and the pressure difference between the two is less than or equal to the preset pressure difference threshold, a first drive signal is sent to the drive unit to enable the drive unit to control the switch module to conduct.

[0087] Correspondingly, when the above conditions are not met, for example, when the first supply voltage of the main power supply is less than the second supply voltage of the secondary power supply, or when the first supply voltage is greater than the second supply voltage and the pressure difference between the two is greater than the preset pressure difference threshold, a second drive signal can be sent to the drive unit to enable the drive unit to control the switch module to disconnect.

[0088] Through the above operations, the control unit can send a first drive signal or a second drive signal to the drive unit according to the pressure difference between the first supply voltage and the second supply voltage, so that the drive unit controls the switch module to conduct or disconnect, realizing the power supply control function of the main power supply and the secondary power supply in the main and secondary power supply technology.

[0089] Figure 4 This is a schematic structural diagram of a control unit provided by an embodiment of the present application. As Figure 4 shown, the control unit includes: a comparison subunit and a logic processing subunit.

[0090] The first end of the comparison subunit is the first end of the control unit, the second end is the second end of the control unit, the third end of the comparison subunit is connected to the first end of the logic processing subunit, and the second end of the logic processing subunit is the third end of the control unit.

[0091] The comparison subunit is configured to output a first signal and a second signal according to a first sampling voltage and a second sampling voltage; the first signal is used to represent the magnitude relationship between the first sampling voltage and the second sampling voltage, and the second signal is used to represent the relationship between the pressure difference between the first sampling voltage and the second sampling voltage and a preset pressure difference threshold. This subunit can be implemented, for example, by an analog circuit capable of implementing a comparison function.

[0092] Figure 5 This is a schematic structural diagram of a comparison subunit provided by an embodiment of the present application. As Figure 5 shown, the comparison subunit may include: a first comparison sub-module and a second comparison sub-module.

[0093] The first comparison sub-module includes: an operational amplifier U2. The non-inverting input terminal (“+” terminal) of the operational amplifier U2 receives BAT1_V, and the inverting input terminal (“-” terminal) of the operational amplifier U2 receives BAT2_V. When BAT1_V is lower than BAT2_V, that is, when the first supply voltage is less than the second supply voltage, the operational amplifier U2 outputs the first signal B1 - B2 as a low level.

[0094] The second comparison sub-module includes: an operational amplifier U3, an operational amplifier U6, a voltage dividing circuit composed of a resistor R31 and a resistor R32, a resistor R25, a resistor R26, a resistor R27, and a resistor R28, where the resistor R27 and the resistor R28 may be resistors with the same resistance value, and the resistor R25 and the resistor R26 may be resistors with the same resistance value.

[0095] The non-inverting input terminal (“+” terminal) of the operational amplifier U3 receives BAT1_V through the resistor R26, and the inverting input terminal (“-” terminal) of the operational amplifier U3 receives BAT2_V through the resistor R25. The output terminal of the operational amplifier U3 is connected to the inverting input terminal (“-” terminal) of the operational amplifier U6 through the resistor R33.

[0096] The operational amplifier U3, resistor R25, resistor R26, resistor R27, and resistor R28 form a subtraction operation circuit, which is used to compare the pressure difference between BAT1_V and BAT2_V and amplify it. The ratio of resistor R27 to resistor R25 determines the amplification factor, that is, the output differential pressure amplification signal Vout is the differential pressure between the first sampling voltage and the second sampling voltage and then amplified, that is, the value of Vout = (BAT1_V - BAT2_V) * (R27 / R25).

[0097] Take Figure 3 the first voltage detection unit and the second voltage detection unit as an example. When applying this voltage detection unit, the sampling voltage BAT1_V is obtained by dividing the first power supply voltage by the voltage dividing circuit, and the sampling voltage BAT2_V is obtained by dividing the second power supply voltage by the voltage dividing circuit. The output differential pressure amplification signal Vout is obtained by first dividing the differential pressure threshold by the voltage detection unit and then amplifying it by the second comparison sub-module.

[0098] The output terminal of the operational amplifier U3 outputs the differential pressure amplification signal to the operational amplifier U6 through the resistor R33.

[0099] The inverting input terminal (“-” terminal) of the operational amplifier U6 receives the output signal of the operational amplifier U3, and the voltage dividing circuit composed of resistor R31 and resistor R32 is connected to the non-inverting input terminal (“+” terminal) of the operational amplifier U6.

[0100] The voltage dividing circuit composed of resistor R31 and resistor R32 is used to set the reference voltage VREF, and the value of this reference voltage VREF is close to the value of the differential pressure amplification signal Vout. When the differential pressure amplification signal Vout output by the operational amplifier U3 is less than or equal to the reference voltage VREF, the operational amplifier U6 outputs the second signal Diff_ok as a high level, which is used to indicate that the first power supply voltage is greater than or equal to the second power supply voltage and the pressure difference between the two is less than or equal to the preset differential pressure threshold.

[0101] Correspondingly, when the above conditions are not met, for example, when the output signal of the operational amplifier U3 is greater than the reference voltage VREF, the operational amplifier U6 outputs the second signal Diff_ok as a low level, which is used to indicate that the first power supply voltage is greater than or equal to the second power supply voltage and the pressure difference between the two is less than or equal to the preset differential pressure threshold.

[0102] Optionally, the above sub-module may also include some capacitors for filtering, such as C6 and C7.

[0103] It should be understood that the above only exemplarily gives a possible structural schematic diagram of the comparison sub-unit, and the connection relationship with the main power supply and the secondary power supply under this structure. The present application is not limited thereto.

[0104] A logic processing sub - unit is configured to output a first driving signal or a second driving signal according to a first signal (such as the aforementioned B1 - B2 signal) and a second signal (such as the aforementioned Diff_ok signal). This unit can be implemented by a digital circuit, for example.

[0105] Figure 6 This is a schematic structural diagram of a logic processing sub - unit provided by an embodiment of the present application. As Figure 6 shown, taking the Figure 5 comparison sub - unit shown as an example, when this comparison sub - unit is applied, the logic processing sub - unit can be, for example, an AND gate A1.

[0106] The first terminal of A1 receives the first signal B1 - B2, and the second terminal of A1 receives the second signal Diff_ok. Only when both B1 - B2 and Diff_ok are at a high level, the first driving signal is output; otherwise, the second driving signal is output.

[0107] That is: when the first supply voltage is greater than or equal to the second supply voltage and the voltage difference between the two is less than or equal to a preset voltage difference threshold, a first driving signal is sent to the driving unit to enable the driving unit to control the switch module to conduct.

[0108] Correspondingly, when the above conditions are not met, for example, when the first supply voltage of the main power supply is less than the second supply voltage of the secondary power supply, or when the first supply voltage is greater than the second supply voltage and the voltage difference between the two is greater than the preset voltage difference threshold, a second driving signal can be sent to the driving unit to enable the driving unit to control the switch module to disconnect.

[0109] (3) Driving unit

[0110] The composition of the driving unit is related to the driving method of the switch module. Taking the switch module including a disconnector as an example, the disconnector can be conducted based on the first driving signal or disconnected based on the second driving signal. In this implementation manner, the driving unit can be as follows:

[0111] Figure 7 This is a schematic structural diagram of a driving unit provided by an embodiment of the present application. As Figure 7 shown, this driving unit can include, for example: a waveform generator and a driving bootstrap sub - unit.

[0112] The first terminal of the waveform generator is the first terminal of the driving unit. The second terminal of the waveform generator is connected to the first terminal of the driving bootstrap sub - unit, and the second terminal of the driving bootstrap sub - unit is the second terminal of the driving unit.

[0113] The waveform generator is configured to send a square - wave signal to the driving bootstrap sub - unit when receiving the first driving signal, and stop sending the square - wave signal to the driving bootstrap sub - unit when receiving the second driving signal.

[0114] Figure 8 The structural schematic diagram of a waveform generator provided by an embodiment of the present application. As Figure 8 shown, exemplarily, the waveform generator may include: an operational amplifier U1, a capacitor C5, a resistor R12, a diode D6, a resistor R9, a resistor R4, and a resistor R11. The resistor R4 and the resistor R11 form a voltage dividing circuit.

[0115] The inverting input terminal (“-” terminal) of the operational amplifier U1 receives a first driving signal or a second driving signal through the diode D6. The non-inverting input terminal (“+” terminal) of the operational amplifier U1 is connected to a power supply unit through a pull-up resistor R9.

[0116] When the diode D6 receives the second driving signal, the diode D6 conducts, the inverting input terminal of the operational amplifier U1 is at a low level, and the output terminal of the operational amplifier U1 remains at a high level, that is, the waveform generator does not send a square wave signal to the driving bootstrap sub-unit.

[0117] When the diode D6 receives the first driving signal, the diode D6 cuts off. Initially, the voltage of the inverting input terminal (“-” terminal) of the operational amplifier U1 is lower than the voltage of the non-inverting input terminal (“+” terminal) of the operational amplifier U1, and the output terminal of the operational amplifier U1 is at a high level. The capacitor C5 is charged through R12; the voltage dividing circuit composed of the resistor R4 and the resistor R11 is used to sample the output terminal voltage as the jump voltage. When the voltage of the capacitor C5 is higher than the jump voltage, that is, higher than the voltage of the inverting input terminal (“-” terminal) of the operational amplifier U1, the output terminal of the operational amplifier U1 is at a low level. Then, the capacitor C5 discharges through R12. When the voltage of the capacitor C5 is lower than the jump voltage, the output terminal of the operational amplifier U1 is at a high level. Repeating this process, a square wave signal is output from the output terminal of the operational amplifier U1. That is, the waveform generator sends a square wave signal to the driving bootstrap sub-unit.

[0118] The driving bootstrap sub-unit is configured to output a high-level signal to drive the isolation switch to conduct when receiving the square wave signal. This sub-unit can be implemented by an analog circuit, for example.

[0119] Figure 9 The structural schematic diagram of a driving bootstrap sub-unit and a switch module provided by an embodiment of the present application. As Figure 9 shown, exemplarily, the switch module may be an N-type metal-oxide-semiconductor (NMOS) isolation switch, and may include an NMOS transistor M1 and an NMOS transistor M2.

[0120] Under this switch module structure, the driving bootstrap sub-unit may include: a first driving bootstrap sub-module and a second driving bootstrap sub-module.

[0121] The first driving bootstrap sub-module includes: a bootstrap capacitor C1, a diode D3, a diode D4, a capacitor C2, and a resistor R15. The first end of the bootstrap capacitor C1 receives the output signal of the waveform generator through R17.

[0122] When the output signal of the waveform generator received by the bootstrap capacitor C1 is a square wave signal, the voltage at the negative electrode of the diode D3 is lifted to a square wave voltage, that is, a high-voltage square wave signal; the diode D4 is an anti-reverse diode, and the output high-voltage square wave signal is accumulated by the capacitor C2, thereby lifting the gate voltage of the NMOS transistor M1, making the gate voltage of the NMOS transistor M1 higher than the source voltage. Under the continuous driving action of the square wave signal, a continuous high level that can turn on the NMOS transistor M1 will be formed between the gate and the source of the NMOS transistor M1. The integrating circuit composed of the capacitor C2 is used to convert the high-voltage square wave signal into a DC level signal, so as to form a DC level higher than the conduction voltage between the gate and the source of the NMOS transistor M1, and the NMOS transistor M1 conducts. That is, when the first supply voltage is greater than or equal to the second supply voltage and the voltage difference between the two is less than or equal to the preset voltage difference threshold, the NMOS transistor M1 conducts.

[0123] When the output signal of the waveform generator received by the bootstrap capacitor C1 is not a square wave signal, the capacitor C2 discharges through the resistor R15, and the NMOS transistor M1 turns off. That is, for example, when the first supply voltage of the main power supply is less than the second supply voltage of the secondary power supply, or when the first supply voltage is greater than the second supply voltage and the voltage difference between the two is greater than the preset voltage difference threshold, the NMOS transistor M1 turns off.

[0124] The second driving bootstrap sub-module includes: a bootstrap capacitor C3, a diode D1, a diode D2, a capacitor C4, and a resistor R1. The first end of the bootstrap capacitor C3 receives the output signal of the waveform generator through R17.

[0125] When the bootstrap capacitor C3 receives a square wave signal as the output signal of the waveform generator, the voltage at the negative terminal of the diode D1 is boosted to a square wave voltage, i.e., a high-voltage square wave signal. The diode D2 is an anti-reverse diode, and the high-voltage square wave signal output by it is accumulated by the capacitor C4, thereby raising the gate voltage of the NMOS transistor M2, making the gate voltage of the NMOS transistor M2 higher than the source voltage. Under the continuous driving action of the square wave signal, a continuous high level that can turn on the NMOS transistor M2 will be formed between the gate and the source of the NMOS transistor M2. The integrating circuit composed of the capacitor C4 is used to convert the high-voltage square wave signal into a DC level signal, thereby forming a DC level higher than the conduction voltage between the gate and the source of the NMOS transistor M2, and the NMOS transistor M2 conducts. That is, when the first supply voltage is greater than or equal to the second supply voltage and the voltage difference between the two is less than or equal to the preset voltage difference threshold, the NMOS transistor M2 conducts.

[0126] When the bootstrap capacitor C3 receives an output signal from the waveform generator that is not a square wave signal, the capacitor C3 discharges through the resistor R1, and the NMOS transistor M2 turns off. That is, for example, when the first supply voltage of the main power supply is less than the second supply voltage of the secondary power supply, or when the first supply voltage is greater than the second supply voltage and the voltage difference between the two is greater than the preset voltage difference threshold, the NMOS transistor M2 turns off.

[0127] After the above operations, the driving bootstrap sub-unit can control the turning off and on of the NMOS isolation switch according to the output signal of the waveform generator, and further realize the control of the disconnection and connection between the secondary power supply and the load.

[0128] Optionally, the driving unit further includes: a driving signal amplification sub-unit. The second end of the waveform generator is connected to the first end of the driving signal amplification sub-unit, and the second end of the driving signal amplification sub-unit is connected to the first end of the driving bootstrap sub-unit. That is, the driving signal amplification sub-unit is located between the waveform generator and the driving bootstrap sub-unit and is used to amplify the square wave signal. In this way, the voltage and driving current of the square wave signal are enhanced, the driving ability of the square wave signal is improved, and the subsequent driving bootstrap sub-unit can be quickly charged to control the rapid conduction of the switching module.

[0129] This sub-unit can be implemented by an analog circuit, for example. Figure 10 The following is a schematic structural diagram of a driving signal amplification sub-unit provided by an embodiment of the present application. As Figure 10 shown, exemplarily, the driving signal amplification sub-unit may include: a push-pull circuit composed of a triode Q1, a triode Q2, and a triode Q3. The triodes Q1 and Q2 can be NPN triodes, and the triode Q3 can be a PNP triode.

[0130] The first terminal of the triode Q1 is used to receive the square wave signal output by the waveform generator. Under the action of the DC power supply V2, a square wave signal with enhanced drive is formed, that is, an enhanced square wave signal. This enhanced drive signal is input into the push-pull circuit composed of the triode Q2 and the triode Q3 through the connecting resistor R18. The push-pull circuit amplifies the drive current of the enhanced square wave signal, enabling the subsequent drive bootstrap sub-unit to be quickly charged.

[0131] For ease of explanation, the power supply unit in this embodiment is described with VCC5 or VCC12, which supplies power to each unit of the control module. However, this power supply is not limited to 5V or 12V, and can also be other DC voltages, which depends on the power supply requirements of each functional unit.

[0132] The power supply control circuit provided in the embodiment of the present application can decide whether to introduce the secondary power supply to jointly supply power to the load based on the relationship between the first power supply voltage provided by the main power supply and the second power supply voltage provided by the secondary power supply. For example, when the power supply voltages provided by the main power supply and the secondary power supply are similar, the main power supply and the secondary power supply are controlled to be connected in parallel to supply power to the load, so that it can be applied to electronic devices with large current loads.

[0133] It should be understood that when the main power supply and the secondary power supply are rechargeable power supplies, the power supply control circuit can also be applied to the circuit for charging the main power supply and the secondary power supply through a charger.

[0134] The main power supply is connected to the charger. For example, the positive pole of the main power supply is connected to the first terminal of the power supply terminal of the charger, and the negative pole of the main power supply is directly connected to the second terminal of the power supply terminal of the charger, constituting the main charging circuit of the charger for charging the main power supply.

[0135] The power supply control circuit includes: a control module and a switch module; wherein, the first terminal of the control module is connected to the power supply terminal of the main power supply, the second terminal of the control module is connected to the power supply terminal of the secondary power supply, the third terminal of the control module is connected to the first terminal of the switch module, and the second terminal of the switch module is connected to the charger, constituting the secondary charging circuit of the charger for charging the secondary power supply.

[0136] When the main power supply is charged, the charging current is injected into the main battery; when the switch module is turned on, the charger charges the main power supply and the secondary power supply simultaneously, and the charging current is the sum of the main power supply and the secondary power supply.

[0137] The above control logic is simple. Therefore, the power supply control circuit can be implemented by an analog circuit and a digital circuit without the need to additionally set up a software control program to achieve the above control. Compared with some existing power supply circuits for electronic devices with large current loads that use a newly added microcontroller to control a switch module through a software control program set on the microcontroller, it can avoid the risk of abnormal operation of the software control program, thereby avoiding the problem of incorrect timing of connecting or disconnecting the main battery or the secondary battery, and improving the stability of power supply.

[0138] It should be understood that the power supply circuit provided in the embodiment of the present application may have only a main power supply and no secondary power supply.

[0139] It should be understood that the power supply control circuit in the embodiment of the present application is not limited to the combined use of a main power supply and a secondary power supply. Multiple secondary power supplies can be used by expanding multiple power supply control circuits in the power supply circuit, which is convenient for expansion and can be applied to scenarios such as power superposition or extended usage time that require multiple different power supplies, realizing the rapid combined use of multiple power supplies in emergency situations.

[0140] The embodiment of the present application also provides a power supply device, which includes: a main power supply, a secondary power supply, and the power supply control circuit described in the foregoing embodiment, for supplying power to a load in the foregoing manner.

[0141] The embodiment of the present application also provides a power supply equipment, which includes: a main power supply, a secondary power supply, a load, and the power supply control circuit described in the foregoing embodiment. The power supply equipment can supply power to its load in the foregoing manner. In this implementation manner, the main power supply, the secondary power supply, the load, and the power supply control circuit described in the foregoing embodiment can be integrated on one device.

[0142] The embodiment of the present application also provides a power supply system, which includes: a main power supply, a secondary power supply, a load, and the power supply control circuit described in the foregoing embodiment. The power supply system can supply power to its load in the foregoing manner. In this implementation manner, the main power supply, the secondary power supply, the load, and the power supply control circuit described in the foregoing embodiment can be independent physical devices.

[0143] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of this application. In the specification of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0144] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, rather than to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power supply control circuit, characterized in that, The power supply control circuit is applied to a power supply loop that supplies power to a load through a main power supply and a secondary power supply. Among them, the main power supply is connected to the load; The power supply control circuit includes: a control module and a switch module; among them, the first end of the control module is connected to the power supply end of the main power supply, the second end of the control module is connected to the power supply end of the secondary power supply, the third end of the control module is connected to the first end of the switch module, and the second end of the switch module is connected to the load; the internal resistance of the switch module is less than a preset value; The control module is used to control the switch module to conduct when the first power supply voltage is greater than or equal to the second power supply voltage and the pressure difference between the two is less than or equal to the preset pressure difference threshold, so as to conduct the power supply loop between the secondary power supply and the load.

2. The circuit according to claim 1, wherein The control module includes: a first voltage detection unit, a second voltage detection unit, a control unit, and a driving unit; The first end of the first voltage detection unit is the first end of the control module, the first end of the second voltage detection unit is the second end of the control module, and the second end of the first voltage detection unit is connected to the first end of the control unit; the second end of the second voltage detection unit is connected to the second end of the control unit, the third end of the control unit is connected to the first end of the driving unit, and the second end of the driving unit is the third end of the control module; The first voltage detection unit is used to sample the first power supply voltage of the main power supply; The second voltage detection unit is used to sample the second power supply voltage of the secondary power supply; The control unit is used for: When the first power supply voltage is greater than or equal to the second power supply voltage and the pressure difference between the two is less than or equal to the preset pressure difference threshold, send a first driving signal to the driving unit so that the driving unit controls the switch module to conduct; When the first power supply voltage is less than the second power supply voltage, or when the first power supply voltage is greater than the second power supply voltage and the pressure difference between the two is greater than the preset pressure difference threshold, send a second driving signal to the driving unit so that the driving unit controls the switch module to disconnect.

3. The circuit according to claim 2, wherein The control unit includes: a comparison sub-unit and a logic processing sub-unit; The first end of the comparison sub-unit is the first end of the control unit, the second end is the second end of the control unit, the third end of the comparison sub-unit is connected to the first end of the logic processing sub-unit, and the second end of the logic processing sub-unit is the third end of the control unit; The comparison sub-unit is used to output a first signal and a second signal according to the first power supply voltage and the second power supply voltage; the first signal is used to represent the magnitude relationship between the first power supply voltage and the second power supply voltage, and the second signal is used to represent the relationship between the pressure difference between the first power supply voltage and the second power supply voltage and the preset pressure difference threshold; The logic processing sub-unit is used to output the first driving signal or the second driving signal according to the first signal and the second signal.

4. The circuit according to claim 2, wherein The switch module includes: a disconnector; The disconnect switch is used to conduct based on the first drive signal or turn off based on the second drive signal.

5. The circuit according to claim 4, wherein The drive unit includes: a waveform generator and a drive bootstrap sub-unit; The first end of the waveform generator is the first end of the drive unit, the second end of the waveform generator is connected to the first end of the drive bootstrap sub-unit, and the second end of the drive bootstrap sub-unit is the second end of the drive unit; The waveform generator is used to send a square wave signal to the drive bootstrap sub-unit when receiving the first drive signal, and stop sending the square wave signal to the drive bootstrap sub-unit when receiving the second drive signal; The drive bootstrap sub-unit is used to output a high-level signal to drive the disconnect switch to conduct when receiving the square wave signal.

6. The circuit according to claim 5, characterized in that, The drive unit further includes: a drive signal amplification sub-unit; The second end of the waveform generator is connected to the first end of the drive signal amplification sub-unit, and the second end of the drive signal amplification sub-unit is connected to the first end of the drive bootstrap sub-unit; The drive signal amplification sub-unit is used to amplify the square wave signal.

7. The circuit according to any one of claims 2-6, characterized in that, The control module includes: a power supply unit; The first end of the power supply unit is connected to the power supply terminal of the main power supply and / or the power supply terminal of the secondary power supply, and the second end of the power supply unit is respectively connected to the power supply terminal of the first voltage detection unit, the power supply terminal of the second voltage detection unit, the power supply terminal of the control unit, and the power supply terminal of the drive unit for providing power supply.

8. A power supply device, characterized in that, The power supply device includes: a main power supply, a secondary power supply, and the power supply control circuit according to any one of claims 1-7.

9. A power supply device, characterized in that, The power supply equipment includes: a main power supply, a secondary power supply, a load, and the power supply control circuit according to any one of claims 1-7.

10. A power supply system, characterized in that, The power supply system includes: a main power supply, a secondary power supply, a load, and the power supply control circuit according to any one of claims 1-7.

Images