Power supply control circuit and power supply device

Abstract

The utility model discloses a power supply control circuit and a power supply device, and relates to the technical field of power supply control. The power supply control circuit comprises a first power supply switch module, a first sampling control module, a second power supply switch module and a second sampling control module, the first sampling control module generates a first power supply control signal, the second sampling control module generates a second power supply control signal, and the first power supply switch module is switched on or switched off according to the first power supply control signal. The second power switch module is switched on or switched off according to the second power control signal, and the post-stage load works according to the first power supply voltage or the second power supply voltage. According to the power supply control circuit provided by the embodiment of the invention, the two sampling control modules are arranged to sample the voltage of the two voltage sources so as to control the conduction state of the two power supply switch modules, so that overvoltage protection of the power supply and management of double-path power supply input are realized, an additional control chip is not needed, and the circuit design cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply control, in particular to a power supply control circuit and a power supply device. Background Art

[0002] In the related art, power management chips such as IC4418 are required to implement overvoltage protection and dual power input management. However, these chips are prohibitively expensive, making them ineffective for low-cost power control circuits. Therefore, a power control circuit that can achieve overvoltage protection and dual power input management while reducing circuit design costs has become an urgent technical challenge. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a power supply control circuit that can reduce circuit design costs while achieving overvoltage protection for the power supply and management of dual power inputs.

[0004] The utility model also provides a power supply device having the power supply control circuit.

[0005] According to the first embodiment of the present invention, a power control circuit includes:

[0006] A first power switch module, the first power switch module being electrically connected to a first voltage source and a subsequent load, respectively; wherein the first voltage source is used to provide a first power supply voltage;

[0007] a first sampling control module, the first sampling control module being electrically connected to the first voltage source and the first power switch module, respectively, and configured to generate a first power control signal according to a preset first voltage protection range and the first supply voltage; wherein the first power switch module is configured to be turned on or off according to the first power control signal;

[0008] a second power switch module, the second power switch module being electrically connected to a second voltage source and the subsequent load, respectively; wherein the second voltage source is used to provide a second power supply voltage;

[0009] a second sampling control module, the second sampling control module being electrically connected to the first voltage source, the second voltage source, and the second power switch module, respectively, and configured to generate a second power control signal according to a preset second voltage protection range, the first supply voltage, and the second supply voltage;

[0010] The second power switch module is configured to be turned on or turned off according to the second power control signal, and the rear-stage load is configured to work according to the first power supply voltage or the second power supply voltage.

[0011] The power supply control circuit has at least the following beneficial effects: the first power switch module is electrically connected with the first voltage source and the rear-stage load respectively, the second power switch module is electrically connected with the second voltage source and the rear-stage load respectively, the first sampling control module is electrically connected with the first voltage source and the first power switch module respectively, the second sampling control module is electrically connected with the first voltage source, the second voltage source and the second power switch module respectively, the first sampling control module is configured to generate the first power control signal according to the preset first voltage protection range and the first power supply voltage provided by the first voltage source, the second sampling control module is configured to generate the second power control signal according to the preset second voltage protection range, the first power supply voltage and the second power supply voltage provided by the second voltage source, the first power switch module is configured to be turned on or turned off according to the first power control signal, the second power switch module is configured to be turned on or turned off according to the second power control signal, and the rear-stage load is configured to work according to the first power supply voltage or the second power supply voltage. The power supply control circuit of the embodiment can sample the voltages of the two voltage sources by arranging two sampling control modules, control the turn-on states of the two power switch modules, manage the overvoltage protection of the power supply and the double-path power input, and does not need to use an additional control chip, thereby reducing the circuit design cost.

[0012] According to some embodiments of the utility model, the first voltage protection range includes a first undervoltage protection threshold and a first overvoltage protection threshold, the first power control signal includes a first overvoltage protection signal and a first undervoltage protection signal, and the first sampling control module includes:

[0013] a first switch unit electrically connected with the first voltage source and the first power switch module respectively, and configured to generate the first overvoltage protection signal according to the first power supply voltage and the first overvoltage protection threshold;

[0014] a second switch unit electrically connected with the first voltage source and the first power switch module respectively, and configured to generate the first undervoltage protection signal according to the first power supply voltage and the first undervoltage protection threshold.

[0015] According to some embodiments of the utility model, the first switch unit includes:

[0016] The first voltage control current element has a gate electrically connected to the first voltage source, a source grounded, and a drain electrically connected to the first power supply control module, and is configured to be turned on or turned off according to the first supply voltage and the first overvoltage protection threshold value, so as to generate the first overvoltage protection signal.

[0017] The second switch unit comprises:

[0018] The second voltage control current element has a gate electrically connected to the first voltage source, a source grounded, and a drain electrically connected to the first power supply control module, and is configured to be turned on or turned off according to the first supply voltage and the first overvoltage protection threshold value, so as to generate the first overvoltage protection signal.

[0019] According to some embodiments of the present application, the second voltage protection range comprises a second overvoltage protection threshold value, a second overvoltage protection threshold value, and a switching voltage threshold value, the second power supply control signal comprises a second overvoltage protection signal, a second overvoltage protection signal, a first switching signal, and a second switching signal, and the second sampling control module comprises:

[0020] The third switch unit is electrically connected to the second voltage source, the first voltage source and the second power supply switch module, respectively, and is configured to generate the first switching signal according to the first supply voltage and the switching voltage threshold value, and is configured to generate the second overvoltage protection signal according to the second supply voltage and the second overvoltage protection threshold value.

[0021] The fourth switch unit is electrically connected to the second voltage source, the first voltage source and the second power supply switch module, respectively, and is configured to generate the second switching signal according to the first supply voltage and the switching voltage threshold value, and is configured to generate the second overvoltage protection signal according to the second supply voltage and the second overvoltage protection threshold value.

[0022] According to some embodiments of the present application, the third switch unit comprises:

[0023] A third voltage-controlled current element, a gate of the third voltage-controlled current element being electrically connected with the second voltage source and the first voltage source respectively, a source of the third voltage-controlled current element being grounded, a drain of the third voltage-controlled current element being electrically connected with the second power supply control module, the third voltage-controlled current element being used for switching on or off according to the first power supply voltage and the switching voltage threshold value, so as to generate a first switching signal, the third voltage-controlled current element being used for switching on or off according to the second power supply voltage and the second overvoltage protection threshold value, so as to generate the second overvoltage protection signal;

[0024] The fourth switch unit comprises:

[0025] A fourth voltage-controlled current element, a gate of the fourth voltage-controlled current element being electrically connected with the second voltage source and the first voltage source respectively, a source of the fourth voltage-controlled current element being grounded, a drain of the fourth voltage-controlled current element being electrically connected with the second power supply control module, the fourth voltage-controlled current element being used for switching on or off according to the first power supply voltage and the switching voltage threshold value, so as to generate a second switching signal, the fourth voltage-controlled current element being used for switching on or off according to the second power supply voltage and the second undervoltage protection threshold value, so as to generate the second undervoltage protection signal.

[0026] According to some embodiments of the present application, the first power supply switch module comprises:

[0027] A fifth voltage-controlled current element, a gate of the fifth voltage-controlled current element being electrically connected with the first sampling control module, a drain of the fifth voltage-controlled current element being electrically connected with the first voltage source, the fifth voltage-controlled current element being used for switching on or off according to the first power supply control signal.

[0028] A diode, an anode of the diode being electrically connected with a source of the fifth voltage-controlled current element, a cathode of the diode being electrically connected with the rear-stage load.

[0029] According to some embodiments of the present application, the second power supply switch module comprises:

[0030] A sixth voltage-controlled current element, a gate of the sixth voltage-controlled current element being electrically connected with the second sampling control module, a drain of the sixth voltage-controlled current element being electrically connected with the second voltage source, the sixth voltage-controlled current element being used for switching on or off according to the second power supply control signal.

[0031] A seventh voltage-controlled current element, a gate of the seventh voltage-controlled current element being electrically connected with the second sampling control module, a drain of the seventh voltage-controlled current element being electrically connected with a source of the sixth voltage-controlled current element, a drain of the seventh voltage-controlled current element being electrically connected with the rear-stage load, the seventh voltage-controlled current element being used for switching on or off according to the second power supply control signal.

[0032] The power supply device according to the second aspect of the present application comprises:

[0033] The power supply control circuit according to the first aspect of the present application comprises:

[0034] A first energy storage battery, which is electrically connected with the power supply control circuit, and is configured to provide the first power supply voltage;

[0035] A second energy storage battery, which is electrically connected with the power supply control circuit, and is configured to provide the second power supply voltage.

[0036] The power supply device according to the present application has at least the following beneficial effects: the power supply device realizes overvoltage protection of the power supply and management of double power supply input by using the power supply control circuit, and does not need to use an additional control chip, thereby reducing the circuit design cost.

[0037] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0038] The present application will be further described below in combination with the drawings and embodiments, wherein:

[0039] Figure 1 The module block diagram of a specific embodiment of the power supply control circuit of the present application;

[0040] Figure 2 The circuit principle diagram of a specific embodiment of the power supply control circuit of the present application.

[0041] Reference signs:

[0042] The first power supply switch module 100, the first sampling control module 200, the first switch unit 210, the second switch unit 220, the second power supply switch module 300, the second sampling control module 400, the third switch unit 410, the fourth switch unit 420, the first voltage source 500, the second voltage source 600, and the rear-stage load 700. DETAILED DESCRIPTION

[0043] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0044] In the description of the utility model, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number.If the first, second is described for the purpose of distinguishing technical features, it cannot be understood as indicating or implying relative importance of the indicated technical features or implying a specific number of the indicated technical features or implying a specific order of the indicated technical features.

[0045] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0046] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection and the like should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the utility model according to the specific content of the technical scheme.

[0047] In the description of the utility model, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model.In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0048] In the related art, in order to realize overvoltage protection of the power supply and management of double power supply input, a power management chip such as IC4418 needs to be set.However, the above chip has the problem of high cost, and cannot be effectively used in the power control circuit of low-cost design.Therefore, how to provide a power control circuit to reduce the circuit design cost under the premise of being able to realize overvoltage protection of the power supply and management of double power supply input has become a technical problem to be solved.

[0049] Based on this, the utility model embodiment provides a kind of power control circuit and power supply device, can reduce circuit design cost under the premise of being able to realize overvoltage protection of the power supply and management of double power supply input.

[0050] As Figure 1The utility model discloses an embodiment provides a power control circuit, and the power control circuit includes: first power switch module 100, first sampling control module 200, second power switch module 300, second sampling control module 400. First power switch module 100 is connected with first voltage source 500 and rear stage load 700 respectively, wherein, first voltage source 500 is used to provide first power voltage, first sampling control module 200 is connected with first voltage source 500 and first power switch module 100 respectively, and first sampling control module 200 is used to generate first power control signal according to preset first voltage protection range and first power voltage, wherein, first power switch module 100 is used to switch on or switch off according to first power control signal, second power switch module 300 is connected with second voltage source 600 and rear stage load 700 respectively, wherein, second voltage source 600 is used to provide second power voltage, second sampling control module 400 is connected with first voltage source 500, second voltage source 600 and second power switch module 300 respectively, and second sampling control module 400 is used to generate second power control signal according to preset second voltage protection range, first power voltage and second power voltage, wherein, second power switch module 300 is used to switch on or switch off according to second power control signal, and rear stage load 700 is used to work according to first power voltage or second power voltage.

[0051] Specifically, first voltage source 500 is the direct current voltage source provided by the first energy storage battery, and second voltage source 600 is the direct current voltage source provided by the second energy storage battery. The power voltage provided by the voltage source can be adjusted according to actual requirements.

[0052] First voltage source 500 is connected with first power switch module 100 and first sampling control module 200 respectively, and first power switch module 100 is also connected with first sampling control module 200 and rear stage load 700 respectively. First sampling control module 200 obtains first power voltage and compares first power voltage with preset first voltage protection range. When first power voltage is in first voltage protection range, it indicates that first power voltage can realize normal power supply, at this time, first sampling control module 200 generates first power control signal to control first power switch module 100 to switch on, so that rear stage load 700 can work according to first power voltage. When first power voltage is not in first voltage protection range, it indicates that first power voltage cannot realize normal power supply, and there is overvoltage or undervoltage phenomenon, at this time, first sampling control module 200 generates first power control signal to control first power switch module 100 to switch off, so that rear stage load 700 stops working according to first power voltage.

[0053] The second voltage source 600 is electrically connected with the second power switch module 300 and the second sampling control module 400 respectively, the first voltage source 500 is also electrically connected with the second sampling control module 400, and the second power switch module 300 is also electrically connected with the second sampling control module 400 and the rear-stage load 700 respectively.

[0054] When the first supply voltage does not reach the supply voltage required by the rear-stage load 700, and the second supply voltage is in the second voltage protection range, it indicates that the first supply voltage provided by the first voltage source 500 is too low to supply power for the rear-stage load 700, while the second supply voltage provided by the second voltage source 600 can realize normal power supply for the rear-stage load 700, at this time, the second sampling control module 400 generates the second power control signal to control the second power switch module 300 to be turned on, so that the rear-stage load 700 can work according to the second supply voltage. When the second supply voltage reaches the supply voltage required by the rear-stage load 700, it indicates that the first supply voltage can supply power for the rear-stage load 700, and the second supply voltage is not needed to supply power, at this time, the second sampling control module 400 generates the second power control signal to control the second power switch module 300 to be turned off, and the first sampling control module 200 judges whether the first supply voltage has overvoltage or undervoltage phenomenon. When the first supply voltage does not reach the supply voltage required by the rear-stage load 700, and the second supply voltage is not in the second voltage protection range, it indicates that the first supply voltage is too low to supply power for the rear-stage load 700, while the second supply voltage has overvoltage or undervoltage phenomenon, and also cannot realize normal power supply for the rear-stage load 700, at this time, the second sampling control module 400 generates the second power control signal to control the second power switch module 300 to be turned off, so that the rear-stage load 700 stops working.

[0055] The power supply control circuit according to the embodiment of the utility model, through setting two sampling control modules to sample the voltage of two voltage sources, the conduction state of two power switch modules is controlled, the overvoltage protection of power supply and the management of double-path power input are realized, and no additional control chip is needed, so that the circuit design cost is reduced.

[0056] As Figure 2As shown, in some specific embodiments of the utility model, the first voltage protection range includes: a first undervoltage protection threshold, a first overvoltage protection threshold, the first power control signal includes: a first overvoltage protection signal, a first undervoltage protection signal, the first sampling control module 200 includes: a first switch unit 210, a second switch unit 220.The first switch unit 210 is electrically connected with the first voltage source 500 and the first power switch module 100 respectively, and the first switch unit 210 is used to generate the first overvoltage protection signal according to the first power voltage and the first overvoltage protection threshold;The second switch unit 220 is electrically connected with the first voltage source 500 and the first power switch module 100 respectively, and the second switch unit 220 is used to generate the first undervoltage protection signal according to the first power voltage and the first undervoltage protection threshold.

[0057] Specifically, the first undervoltage protection threshold is the minimum value of the first voltage protection range, and the first overvoltage protection threshold is the maximum value of the first voltage protection range.The first switch unit 210 is electrically connected with the first voltage source 500 and the first power switch module 100 respectively, and the first switch unit 210 receives the first power voltage and compares the first power voltage with the first overvoltage protection threshold to determine whether the first power voltage is greater than the first overvoltage protection threshold, thereby generating the first overvoltage protection signal.The second switch unit 220 is electrically connected with the first voltage source 500 and the first power switch module 100 respectively, and the second switch unit 220 receives the first power voltage and compares the first power voltage with the first undervoltage protection threshold, thereby generating the first undervoltage protection signal.

[0058] When the first undervoltage protection signal indicates that the first power voltage is greater than the first undervoltage protection threshold, and the first overvoltage protection signal indicates that the first power voltage is less than the first overvoltage protection threshold, it indicates that the first power voltage can realize normal power supply at this time, and the first power switch module 100 is turned on at this time, so that the rear stage load 700 can work according to the first power voltage.When the first undervoltage protection signal indicates that the first power voltage is less than the first undervoltage protection threshold, or the first overvoltage protection signal indicates that the first power voltage is greater than the first overvoltage protection threshold, it indicates that the first power voltage has overvoltage or undervoltage phenomenon at this time, and the first power switch module 100 is turned off at this time, so that the rear stage load 700 stops working according to the first power voltage. That is, the first switch unit 210 can judge the overvoltage phenomenon to realize overvoltage protection, and the second switch unit 220 can judge the undervoltage phenomenon to realize undervoltage protection.

[0059] As Figure 2As shown, in some specific embodiments of the present invention, the first switch unit 210 includes a first voltage-controlled flow element, and the second switch unit 220 includes a second voltage-controlled flow element. The gate of the first voltage-controlled flow element is electrically connected to the first voltage source 500, the source of the first voltage-controlled flow element is grounded, and the drain of the first voltage-controlled flow element is electrically connected to the first power switch module 100. The first voltage-controlled flow element is used to turn on or off according to the first supply voltage and the first overvoltage protection threshold to generate a first overvoltage protection signal; the gate of the second voltage-controlled flow element is electrically connected to the first voltage source 500, the source of the second voltage-controlled flow element is grounded, and the drain of the second voltage-controlled flow element is electrically connected to the first power control module. The second voltage-controlled flow element is used to turn on or off according to the first supply voltage and the first undervoltage protection threshold to generate a first undervoltage protection signal.

[0060] Specifically, the gate of the first voltage-controlled flow element receives a first power supply voltage. When the first power supply voltage is greater than a first overvoltage protection threshold, the first voltage-controlled flow element is turned on. Since the source of the first voltage-controlled flow element is grounded, the drain of the first voltage-controlled flow element is in a low-level state at this time, that is, the first voltage-controlled flow element generates a low-level first overvoltage protection signal at this time. When the first power supply voltage is less than the first overvoltage protection threshold, the first voltage-controlled flow element is turned off. Therefore, the drain of the first voltage-controlled flow element is in a high-level state at this time, that is, the first voltage-controlled flow element generates a high-level first overvoltage protection signal at this time.

[0061] The gate of the second voltage-controlled flow element receives the first supply voltage. When the first supply voltage is less than the first undervoltage protection threshold, the second voltage-controlled flow element is turned on. Since the source of the second voltage-controlled flow element is grounded, the drain of the second voltage-controlled flow element is in a low-level state, that is, the second voltage-controlled flow element generates a low-level first undervoltage protection signal. When the first supply voltage is greater than the first undervoltage protection threshold, the second voltage-controlled flow element is turned off. Therefore, the drain of the second voltage-controlled flow element is in a high-level state, that is, the second voltage-controlled flow element generates a high-level first undervoltage protection signal.

[0062] When the first undervoltage protection signal is high and the first overvoltage protection signal is also high, it indicates that the first supply voltage can be normally supplied. The first power switch module 100 is turned on, allowing the subsequent load 700 to operate according to the first supply voltage. When the first undervoltage protection signal is low or the first overvoltage protection signal is low, it indicates that the first supply voltage is overvoltage or undervoltage. The first power switch module 100 is turned off, causing the subsequent load 700 to stop operating according to the first supply voltage.

[0063] like Figure 2As shown, in some specific embodiments of the present invention, the second voltage protection range includes: a second undervoltage protection threshold, a second overvoltage protection threshold, and a switching voltage threshold; the second power control signal includes: a second overvoltage protection signal, a second undervoltage protection signal, a first switching signal, and a second switching signal; and the second sampling control module 400 includes: a third switch unit 410 and a fourth switch unit 420. The third switch unit 410 is electrically connected to the second voltage source 600, the first voltage source 500, and the second power switch module 300, respectively. The third switch unit 410 is configured to generate a first switching signal based on the first supply voltage and the switching voltage threshold, and the third switch unit 410 is configured to generate a second overvoltage protection signal based on the second supply voltage and the second overvoltage protection threshold; the fourth switch unit 420 is electrically connected to the second voltage source 600, the first voltage source 500, and the second power switch module 300, respectively. The fourth switch unit 420 is configured to generate a second switching signal based on the first supply voltage and the switching voltage threshold, and the fourth switch unit 420 is configured to generate a second undervoltage protection signal based on the second supply voltage and the second undervoltage protection threshold.

[0064] Specifically, the second undervoltage protection threshold is the minimum value of the second voltage protection range, the second overvoltage protection threshold is the maximum value of the second voltage protection range, and the switching voltage threshold is used to determine whether the first supply voltage reaches the supply voltage required by the subsequent load 700.

[0065] The third switch unit 410 is electrically connected to the first voltage source 500, the second voltage source 600, and the second power switch module 300, respectively. The fourth switch unit 420 is electrically connected to the first voltage source 500, the second voltage source 600, and the second power switch module 300, respectively. The third switch unit 410 and the fourth switch unit 420 each receive a first supply voltage and compare the first supply voltage with a switching voltage threshold. When the first supply voltage is less than the switching voltage threshold, it indicates that the first supply voltage does not reach the supply voltage required by the subsequent load 700. At this time, the first switching signal generated by the third switch unit 410 and the second switching signal generated by the fourth switch unit 420 can control the second power switch module 300 to conduct, so that when the first voltage source 500 is unable to power the subsequent load 700, the second supply voltage provided by the second voltage source 600 is switched to power the subsequent load 700.

[0066] The third switch unit 410 receives the second supply voltage and compares the second supply voltage with a second undervoltage protection threshold to generate a second undervoltage protection signal. The fourth switch unit 420 receives the second supply voltage and compares the second supply voltage with a second undervoltage protection threshold to generate a second undervoltage protection signal.

[0067] When the second undervoltage protection signal indicates that the second supply voltage is greater than the second undervoltage protection threshold, and the second overvoltage protection signal indicates that the second supply voltage is less than the second overvoltage protection threshold, the second supply voltage can be normally supplied. The second power switch module 300 remains on, allowing the subsequent load 700 to operate according to the second supply voltage. When the second undervoltage protection signal indicates that the second supply voltage is less than the second undervoltage protection threshold, or the second overvoltage protection signal indicates that the second supply voltage is greater than the second overvoltage protection threshold, an overvoltage or undervoltage condition exists in the second supply voltage. The second power switch module 300 is turned off, causing the subsequent load 700 to stop operating according to the second supply voltage. In other words, the third switch unit 410 can detect an overvoltage condition to implement overvoltage protection, and the fourth switch unit 420 can detect an undervoltage condition to implement undervoltage protection.

[0068] like Figure 2 As shown, in some specific embodiments of the present invention, the third switch unit 410 includes a third voltage-controlled flow element, and the fourth switch unit 420 includes a fourth voltage-controlled flow element. The gate of the third voltage-controlled flow element is electrically connected to the second voltage source 600 and the first voltage source 500 respectively, the source of the third voltage-controlled flow element is grounded, the drain of the third voltage-controlled flow element is electrically connected to the second power control module, the third voltage-controlled flow element is used to switch the conduction state according to the first supply voltage and the switching voltage threshold to generate a first switching signal, the third voltage-controlled flow element is used to turn on or off according to the second supply voltage and the second overvoltage protection threshold to generate a second overvoltage protection signal; the gate of the fourth voltage-controlled flow element is electrically connected to the second voltage source 600 and the first voltage source 500 respectively, the source of the fourth voltage-controlled flow element is grounded, the drain of the fourth voltage-controlled flow element is electrically connected to the second power control module, the fourth voltage-controlled flow element is used to switch the conduction state according to the first supply voltage and the switching voltage threshold to generate a second switching signal, the fourth voltage-controlled flow element is used to turn on or off according to the second supply voltage and the second undervoltage protection threshold to generate a second undervoltage protection signal.

[0069] Specifically, the gate of the third voltage-controlled flow element receives the first supply voltage, and the gate of the fourth voltage-controlled flow element also receives the first supply voltage. When the first supply voltage is greater than the switching voltage threshold, it indicates that the first supply voltage reaches the supply voltage required by the subsequent load 700, and there is no need to use the second supply voltage provided by the second voltage source 600 for power supply. At this time, the third and fourth voltage-controlled flow elements are both turned on, that is, each generates a first switching signal and a second switching signal at a low level, thereby controlling the second power switch module 300 to be turned off. When the first supply voltage is less than the switching voltage threshold, it indicates that the first supply voltage does not reach the supply voltage required by the subsequent load 700. At this time, the third and fourth voltage-controlled flow elements are both turned off, that is, each generates a first switching signal and a second switching signal at a high level, thereby controlling the second power switch module 300 to be turned on, so that when the first voltage source 500 is unable to power the subsequent load 700, the second supply voltage provided by the second voltage source 600 is switched to power the subsequent load 700.

[0070] The gate of the third voltage-controlled flow element receives a second supply voltage. When the second supply voltage is greater than the second overvoltage protection threshold, the third voltage-controlled flow element is turned on. Since the source of the third voltage-controlled flow element is grounded, the drain of the third voltage-controlled flow element is in a low-level state, i.e., the third voltage-controlled flow element generates a low-level second overvoltage protection signal. When the second supply voltage is less than the second overvoltage protection threshold, the third voltage-controlled flow element is turned off. Therefore, the drain of the third voltage-controlled flow element remains in a high-level state, i.e., the third voltage-controlled flow element generates a high-level second overvoltage protection signal.

[0071] The gate of the fourth voltage-controlled flow element receives the second supply voltage. When the second supply voltage is less than the second under-voltage protection threshold, the fourth voltage-controlled flow element is turned on. Since the source of the fourth voltage-controlled flow element is grounded, the drain of the fourth voltage-controlled flow element is in a low-level state at this time, that is, the fourth voltage-controlled flow element generates a low-level second under-voltage protection signal. When the second supply voltage is greater than the second under-voltage protection threshold, the fourth voltage-controlled flow element is turned off. Therefore, the drain of the fourth voltage-controlled flow element is in a high-level state at this time, that is, the fourth voltage-controlled flow element generates a high-level second under-voltage protection signal.

[0072] When the second undervoltage protection signal is high and the second overvoltage protection signal is also high, it indicates that the second supply voltage can provide normal power. The second power switch module 300 remains on, allowing the subsequent load 700 to operate according to the first supply voltage. When the second undervoltage protection signal is low or the second overvoltage protection signal is low, it indicates that the second supply voltage is overvoltage or undervoltage. The second power switch module 300 is turned off, causing the subsequent load 700 to stop operating according to the second supply voltage.

[0073] As Figure 2 shown, in some embodiments of the utility model, first power switch module 100 includes: fifth control voltage and current element, diode. Fifth control voltage and current element's grid is connected with first sampling control module 200 electricity, fifth control voltage and current element's drain is connected with first voltage source 500 electricity, fifth control voltage and current element is used for conducting or shutting off according to first power control signal;Diode's anode is connected with fifth control voltage and current element's source electricity, diode's cathode is connected with the load 700 electricity of later stage.

[0074] Specifically, the gate of the fifth voltage and current control element is electrically connected with the first and second voltage and current control elements, respectively, and the diode is electrically connected with the source of the fifth voltage and current control element and the load 700 of the later stage. The gate of the fifth voltage and current control element receives the first overvoltage protection signal and the first undervoltage protection signal. When the first undervoltage protection signal is a high-level signal and the first overvoltage protection signal is also a high-level signal, the fifth voltage and current control element is turned on, so that the source and drain of the fifth voltage and current control element are turned on. At this time, the load 700 of the later stage can work according to the first power supply voltage. When the first undervoltage protection signal is a low-level signal or the first overvoltage protection signal is a low-level signal, the fifth voltage and current control element is turned off, so that the source and drain of the fifth voltage and current control element are turned off. At this time, the load 700 of the later stage stops working according to the first power supply voltage.

[0075] As Figure 2 shown, in some embodiments of the utility model, second power switch module 300 includes: sixth control voltage and current element, seventh control voltage and current element. The gate of the sixth control voltage and current element is electrically connected with the second sampling control module 400, and the drain of the sixth control voltage and current element is electrically connected with the second voltage source 600. The sixth control voltage and current element is used for conducting or shutting off according to the second power control signal. The gate of the seventh control voltage and current element is electrically connected with the second sampling control module 400, the drain of the seventh control voltage and current element is electrically connected with the source of the sixth control voltage and current element, and the drain of the seventh control voltage and current element is electrically connected with the load 700 of the later stage. The seventh control voltage and current element is used for conducting or shutting off according to the second power control signal.

[0076] Specifically, the gate of the sixth control voltage and current element and the gate of the seventh control voltage and current element are electrically connected with the third and fourth voltage and current control elements, and the gate of the sixth control voltage and current element and the gate of the seventh control voltage and current element receive the first switching signal, the second switching signal, the second overvoltage protection signal and the second undervoltage protection signal.

[0077] When the third voltage-controlled flow element generates a low-level first switching signal and the fourth voltage-controlled flow element generates a low-level second switching signal, the sixth and seventh voltage-controlled flow elements are both turned off. When the third voltage-controlled flow element generates a high-level first switching signal and the fourth voltage-controlled flow element generates a high-level second switching signal, the sixth and seventh voltage-controlled flow elements are both turned on, so that when the first voltage source 500 is unable to power the subsequent-stage load 700, the second supply voltage provided by the second voltage source 600 is switched to power the subsequent-stage load 700.

[0078] When the second undervoltage protection signal is high and the second overvoltage protection signal is also high, the sixth and seventh voltage-controlled flow elements are both turned on, and the subsequent load 700 continues to operate based on the second supply voltage. When the second undervoltage protection signal is low or the second overvoltage protection signal is low, the sixth and seventh voltage-controlled flow elements are both turned off, and the subsequent load 700 stops operating based on the second supply voltage.

[0079] The present invention also provides a power supply device, comprising: a first energy storage battery, a second energy storage battery, and a power control circuit as described in any of the above embodiments. The first energy storage battery is electrically connected to the power control circuit and is configured to provide a first power supply voltage; the second energy storage battery is electrically connected to the power control circuit and is configured to provide a second power supply voltage.

[0080] It can be seen that the contents of the above-mentioned power supply control circuit embodiments are all applicable to the embodiments of the present power supply device. The functions specifically implemented by the present power supply device embodiments are the same as those of the above-mentioned power supply control circuit embodiments, and the beneficial effects achieved are also the same as those achieved by the above-mentioned power supply control circuit embodiments.

[0081] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. In addition, the embodiments of the present invention and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A power supply control circuit, characterized in that: include: A first power switch module, the first power switch module being electrically connected to a first voltage source and a subsequent load, respectively; wherein the first voltage source is used to provide a first power supply voltage; a first sampling control module, the first sampling control module being electrically connected to the first voltage source and the first power switch module, respectively, and configured to generate a first power control signal according to a preset first voltage protection range and the first supply voltage; wherein the first power switch module is configured to be turned on or off according to the first power control signal; a second power switch module, the second power switch module being electrically connected to a second voltage source and the subsequent load, respectively; wherein the second voltage source is used to provide a second power supply voltage; a second sampling control module, the second sampling control module being electrically connected to the first voltage source, the second voltage source, and the second power switch module, respectively, and configured to generate a second power control signal according to a preset second voltage protection range, the first supply voltage, and the second supply voltage; The second power switch module is used to be turned on or off according to the second power control signal, and the subsequent load is used to operate according to the first power supply voltage or the second power supply voltage.

2. The power supply control circuit according to claim 1, wherein: The first voltage protection range includes: a first undervoltage protection threshold and a first overvoltage protection threshold; the first power control signal includes: a first overvoltage protection signal and a first undervoltage protection signal; and the first sampling control module includes: a first switch unit, the first switch unit being electrically connected to the first voltage source and the first power switch module respectively, and the first switch unit being configured to generate the first overvoltage protection signal according to the first supply voltage and the first overvoltage protection threshold; A second switch unit, the second switch unit is electrically connected to the first voltage source and the first power switch module respectively, and the second switch unit is used to generate the first undervoltage protection signal according to the first supply voltage and the first undervoltage protection threshold.

3. The power supply control circuit according to claim 2, wherein: The first switch unit includes: a first voltage-controlled current element, wherein a gate of the first voltage-controlled current element is electrically connected to the first voltage source, a source of the first voltage-controlled current element is grounded, and a drain of the first voltage-controlled current element is electrically connected to the first power switch module, and the first voltage-controlled current element is configured to be turned on or off according to the first supply voltage and the first overvoltage protection threshold to generate the first overvoltage protection signal; The second switch unit includes: A second voltage-controlled flow element, wherein the gate of the second voltage-controlled flow element is electrically connected to the first voltage source, the source of the second voltage-controlled flow element is grounded, the drain of the second voltage-controlled flow element is electrically connected to the first power supply control module, and the second voltage-controlled flow element is used to turn on or off according to the first supply voltage and the first under-voltage protection threshold to generate the first under-voltage protection signal.

4. The power supply control circuit according to claim 1, wherein: The second voltage protection range includes: a second undervoltage protection threshold, a second overvoltage protection threshold, and a switching voltage threshold; the second power supply control signal includes: a second overvoltage protection signal, a second undervoltage protection signal, a first switching signal, and a second switching signal; and the second sampling control module includes: a third switch unit, the third switch unit being electrically connected to the second voltage source, the first voltage source, and the second power switch module, respectively, the third switch unit being configured to generate the first switching signal according to the first supply voltage and the switching voltage threshold, and the third switch unit being configured to generate the second overvoltage protection signal according to the second supply voltage and the second overvoltage protection threshold; A fourth switch unit, wherein the fourth switch unit is electrically connected to the second voltage source, the first voltage source and the second power switch module respectively, and the fourth switch unit is used to generate the second switching signal according to the first supply voltage and the switching voltage threshold, and the fourth switch unit is used to generate the second under-voltage protection signal according to the second supply voltage and the second under-voltage protection threshold.

5. The power supply control circuit according to claim 4, wherein: The third switch unit includes: a third voltage-controlled flow element, wherein the gate of the third voltage-controlled flow element is electrically connected to the second voltage source and the first voltage source respectively, the source of the third voltage-controlled flow element is grounded, and the drain of the third voltage-controlled flow element is electrically connected to the second power supply control module, the third voltage-controlled flow element is configured to switch the conduction state according to the first supply voltage and the switching voltage threshold to generate a first switching signal, and the third voltage-controlled flow element is configured to be turned on or off according to the second supply voltage and the second overvoltage protection threshold to generate the second overvoltage protection signal; The fourth switch unit includes: A fourth voltage-controlled flow element, the gate of the fourth voltage-controlled flow element is electrically connected to the second voltage source and the first voltage source respectively, the source of the fourth voltage-controlled flow element is grounded, the drain of the fourth voltage-controlled flow element is electrically connected to the second power supply control module, the fourth voltage-controlled flow element is used to switch the conduction state according to the first supply voltage and the switching voltage threshold to generate a second switching signal, and the fourth voltage-controlled flow element is used to turn on or off according to the second supply voltage and the second under-voltage protection threshold to generate the second under-voltage protection signal.

6. The power supply control circuit according to any one of claims 1 to 5, characterized in that: The first power switch module includes: a fifth voltage-controlled flow element, wherein a gate of the fifth voltage-controlled flow element is electrically connected to the first sampling control module, a drain of the fifth voltage-controlled flow element is electrically connected to the first voltage source, and the fifth voltage-controlled flow element is configured to be turned on or off according to the first power supply control signal; A diode, wherein the anode of the diode is electrically connected to the source of the fifth voltage-controlled current element, and the cathode of the diode is electrically connected to the subsequent load.

7. The power supply control circuit according to claim 6, wherein: The second power switch module includes: a sixth voltage-controlled flow element, wherein a gate of the sixth voltage-controlled flow element is electrically connected to the second sampling control module, a drain of the sixth voltage-controlled flow element is electrically connected to the second voltage source, and the sixth voltage-controlled flow element is configured to be turned on or off according to the second power supply control signal; a seventh voltage-controlled flow element, wherein the gate of the seventh voltage-controlled flow element is electrically connected to the second sampling control module, the drain of the seventh voltage-controlled flow element is electrically connected to the source of the sixth voltage-controlled flow element, the drain of the seventh voltage-controlled flow element is electrically connected to the subsequent load, and the seventh voltage-controlled flow element is used to be turned on or off according to the second power supply control signal.

8. A power supply device, characterized in that include: The power control circuit according to any one of claims 1 to 7; a first energy storage battery, the first energy storage battery being electrically connected to the power control circuit, and the first energy storage battery being used to provide the first supply voltage; A second energy storage battery, wherein the second energy storage battery is electrically connected to the power control circuit, and the second energy storage battery is used to provide the second power supply voltage.

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