Power output control device and method

Abstract

The invention discloses a power output control device and method. According to the power output control device, a switch module is connected with a sampling module, the sampling module is further connected with a clamping module, a control module and a load, the switch module is further connected with the control module and a power supply, and the clamping module is further connected with a detection power supply; the switch module is used for controlling on or off of a power supply loop of the load; the sampling module is used for collecting input voltage of a load; the clamping module is used for preventing the power supply from being connected with the detection power supply; the control module is used for controlling whether a power supply loop of the load is switched on or not according to first sampling voltage collected by the sampling module when the switch module is switched on and second sampling voltage collected by the sampling module when the switch module is switched off. The power output control device provided by the embodiment of the invention can detect the states of the connected power supply and the load, and controls whether the load is powered on or not according to the detection result, so that the load is prevented from being damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a power supply output control device and method. Background Art

[0002] With the development of technology, power supply has become an indispensable part of daily life and industrial control. The control of power supply output is usually achieved through a switch. When the switch is closed, the power supply outputs to supply power to the load. When the switch is open, the power supply stops outputting to stop supplying power to the load.

[0003] However, this type of power output control is relatively simple, and the state of the power supply during power supply and the state of the load are uncertain. Power supply when the power supply and / or load are abnormal is likely to cause damage to the load. Summary of the invention

[0004] The invention provides a power output control device and method to avoid load damage.

[0005] According to one aspect of the present invention, a power output control device is provided, the power output control device comprising: a switch module, a sampling module, a clamping module and a control module;

[0006] The switch module is connected to the sampling module, the sampling module is also connected to the clamping module, the control module and the load respectively, the switch module is also connected to the control module and the power supply respectively, and the clamping module is also connected to the detection power supply;

[0007] The switch module is used to control the on or off of the power supply circuit of the load; the sampling module is used to collect the input voltage of the load; the clamping module is used to prevent the power supply from being connected to the detection power supply; the control module is used to control whether the power supply circuit of the load is on based on the first sampling voltage collected by the sampling module when the switch module is closed and the second sampling voltage collected by the sampling module when the switch module is turned off.

[0008] Optionally, the switch module comprises: at least two output switch units and at least two output control units;

[0009] The output switch units are connected in series, the first output switch unit is also connected to the power supply, the last output switch unit is also connected to the sampling module, the output switch units are connected to the output control units one by one, and the output control units are also connected to the control module;

[0010] The output control unit is used to drive the output switch unit to close; the output switch unit is used to control the on or off of the power supply circuit of the load.

[0011] Optionally, the output control unit includes: a control filter subunit and a control drive subunit;

[0012] The first end of the control filter subunit is connected to the control module, the second end of the control filter subunit is connected to the first end of the control drive subunit, the second end of the control drive subunit is connected to the output switch unit, and the third end of the control drive subunit is grounded.

[0013] Optionally, the control filter subunit includes: a control filter resistor and a control filter capacitor;

[0014] The first end of the control filter resistor is connected to the control module, the second end of the control filter resistor is connected to the control drive subunit, the first end of the control filter capacitor is connected to the second end of the control filter resistor, and the second end of the control filter capacitor is grounded.

[0015] Optionally, the control driving subunit includes: a control driving switch tube;

[0016] The control end of the control driving switch tube serves as the first end of the control driving subunit, the input end of the control driving switch tube serves as the second end of the control driving subunit, and the output end of the control driving switch tube serves as the third end of the control driving subunit.

[0017] Optionally, the output switch unit includes: an output resistor and an output switch tube;

[0018] The first end of the output resistor is connected to the power supply, the second end of the output resistor is connected to the control end of the output switch tube, the input end of the output switch tube is connected to the power supply, and the output end of the output switch tube is connected to the load.

[0019] Optionally, the sampling module includes: a sampling voltage dividing unit, a first sampling filtering unit and a second sampling filtering unit;

[0020] The first end of the sampling voltage divider unit is connected to the switch module, the second end of the sampling voltage divider unit is grounded, the third end of the sampling voltage divider unit is connected to the control module, the first sampling filter unit is connected between the second end of the sampling voltage divider unit and the third end of the sampling voltage divider unit, and the second sampling filter unit is connected in parallel with the sampling voltage divider unit;

[0021] The sampling voltage-dividing unit is used to perform voltage-dividing sampling on the input voltage of the load; the first sampling filtering unit is used to filter out interference in the sampled voltage; and the second sampling filtering unit is used to filter out interference generated by voltage sampling.

[0022] Optionally, the clamping module includes: a clamping diode;

[0023] An anode terminal of the clamping diode is connected to the detection power supply, and a cathode terminal of the clamping diode is connected to the load.

[0024] Optionally, the power output control device further includes: a current limiting module;

[0025] The current limiting module is connected between the power supply and the switch module;

[0026] The current limiting module is used to limit the current output by the power supply.

[0027] According to another aspect of the present invention, a power output control method is further provided, which is executed by a control module of the power output control device described in any of the above embodiments, wherein the power output control device comprises: a switch module, a sampling module, a clamping module and a control module; the power output control method comprises:

[0028] Controlling the switch module to close;

[0029] Acquire a first sampled voltage collected by the sampling module when the switch module is closed;

[0030] Controlling the switch module to turn off;

[0031] Acquire a second sampled voltage collected by the sampling module when the switch module is turned off;

[0032] If the first sampling unit voltage is equal to a first preset voltage and the second sampling voltage is not equal to zero, controlling the switch module to close so that the power supply circuit of the load is turned on;

[0033] If the first sampling unit voltage is not equal to the first preset voltage and / or the second sampling voltage is equal to zero, the switch module is controlled to be turned off so that the power supply circuit of the load is turned off.

[0034] The control module of the embodiment of the present invention controls the switch module to close, the acquisition module acquires the input voltage of the load when the switch module is closed, that is, the first sampling voltage, the control module acquires the first sampling voltage, and controls the switch module to turn off when the first sampling voltage is acquired; the sampling module acquires the input voltage of the load when the switch module is turned off, that is, the second sampling voltage, and the control module acquires the second sampling voltage; the control module determines whether the state of the power supply is normal according to the first sampling voltage, determines whether the state of the load is normal according to the second sampling voltage, and controls the power supply circuit of the load to be turned on when the states of the power supply and the load are both normal. The power output control device provided by the embodiment of the present invention can detect the state of the power supply and the load to which it is connected, and control whether the load is powered on according to the detection result, which is conducive to avoiding damage to the load.

[0035] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a schematic diagram of a power output control device provided by an embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of another power output control device provided by an embodiment of the present invention;

[0039] Figure 3 is a schematic diagram of another power output control device provided by an embodiment of the present invention;

[0040] Figure 4 is a schematic diagram of another power output control device provided by an embodiment of the present invention;

[0041] Figure 5 is a schematic diagram of another power output control device provided by an embodiment of the present invention;

[0042] Figure 6 is a schematic diagram of another power output control device provided by an embodiment of the present invention;

[0043] Figure 7 is a schematic diagram of another power output control device provided by an embodiment of the present invention;

[0044] Figure 8 It is a flow chart of a power output control method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] The embodiment of the present invention provides a power output control device. The power output control device can be applied to a power supply system, can detect the status of the power supply and load to which it is connected, and control whether the load is powered on according to the detection result, which is conducive to avoiding damage to the load. Figure 1 Schematic diagram of a power output control device provided by an embodiment of the present invention. Figure 1 The power output control device includes: a switch module 110, a sampling module 120, a clamping module 130 and a control module 140.

[0048] The switch module 110 is connected to the sampling module 120, and the sampling module 120 is also connected to the clamp module 130, the control module 140 and the load 200 respectively. The switch module 110 is also connected to the control module 140 and the power supply VCC1 respectively, and the clamp module 130 is also connected to the detection power supply VCC2; the switch module 110 is used to control the conduction or shutdown of the power supply circuit of the load 200; the sampling module 120 is used to collect the input voltage of the load 200; the clamp module 130 is used to prevent the power supply VCC1 from being connected to the detection power supply VCC2; the control module 140 is used to control whether the power supply circuit of the load 200 is conducted according to the first sampled voltage collected by the sampling module 120 when the switch module 110 is closed and the second sampled voltage collected by the sampling module 120 when the switch module 110 is turned off.

[0049] Specifically, before supplying power to the load 200, the states of the power supply VCC1 and the load 200 are detected. The power supply VCC1 is used to provide a working voltage for the load 200, and the detection power supply VCC2 is used to provide a state detection voltage for the load 200.

[0050] The state of the power supply VCC1 is determined by the output voltage of the power supply VCC1, so the switch module 110 needs to be closed during detection. The control process of the control module 140 on the switch module 110 may be, for example, that the control module 140 generates a closing instruction, the switch module 110 obtains the closing instruction, and performs a closing action according to the closing instruction. When the switch module 110 is closed, the power supply circuit between the power supply VCC1 and the load 200 is connected, and at this time, the sampling module 120 detects the input voltage of the load 200 and generates a first sampling voltage. The control module 140 obtains the first sampling voltage of the sampling module 120, and generates a shutdown instruction when the first sampling voltage is obtained. The switch module 110 obtains the shutdown instruction and performs a shutdown action according to the shutdown instruction. It should be noted that when detecting the state of the power supply VCC1, the closing of the switch module 110 is only to obtain the first sampling voltage. Therefore, when detecting the state of the power supply VCC1, the closing time of the switch module 110 is short. Therefore, the power-on of the load 200 at this time will not affect the load 200.

[0051] The state of the load 200 is determined by the input voltage of the load 200 when the switch module 110 is turned off. The detection power supply VCC2 is connected to the load 200 through the clamp module 130. When the potential of the input side (detection unit VCC2) of the clamp module 130 is greater than the potential of the output side (the side connected to the load 200) of the clamp module 130, the clamp module 130 is turned on. Since the output side of the clamp module 130 is connected to the switch module 110, the potential of the output side of the clamp module 130 depends on whether the switch module 110 is closed. Among them, the voltage of the power supply VCC1 is greater than the voltage of the detection unit VCC2. When the switch module 110 is closed, the potential of the input side of the clamp module 130 is less than the potential of the output side of the clamp module 130, and at this time, the clamp module 130 is turned off; when the switch module 110 is turned off, the potential of the input side of the clamp module 130 is greater than the potential of the output side of the clamp module 130, and at this time, the clamp module 130 is turned on.

[0052] Therefore, when the switch module 110 is turned off, the load 200 still has a certain input voltage. Among them, the output voltage of the detection power supply VCC2 is less than the power supply voltage required by the load 200, so the load 200 will not operate under the drive of the detection unit VCC2. When the switch module 110 is turned off, the sampling module 120 detects the input voltage of the load 200 and generates a second sampling voltage. The control module 140 obtains the second sampling voltage of the sampling module 120.

[0053] The control module 140 determines the state of the power supply VCC1 according to the first sampling voltage and the first preset voltage. The power supply voltage required by the load 200 is fixed, and the output voltage of the power supply VCC1 matches the power supply voltage required by the load 200. When the first sampling voltage is equal to the first preset voltage, the state of the power supply VCC1 is normal; when the first sampling voltage is not equal to the first preset voltage, the state of the power supply VCC1 is abnormal. Similarly, the control module 140 determines the state of the load 200 according to the second sampling voltage and the second preset voltage. Since the impedance of the load 200 is zero when the load 200 is short-circuited, when the load 200 is short-circuited, the input voltage of the load 200 collected by the sampling module 120 is zero, that is, the second sampling voltage is zero, and at this time the second sampling voltage is not equal to the second preset voltage. When the second sampling voltage is equal to zero, the state of the load 200 is abnormal; when the second sampling voltage is not equal to zero, the state of the load 200 is normal. When the power supply VCC1 is in a normal state and the load 200 is in a normal state, the control module 140 generates a closing instruction to control the power supply circuit of the load 200 to be turned on. That is, when the first sampling unit is equal to the first preset voltage and the second sampling voltage is not equal to zero, the control module 140 controls the power supply circuit of the load 200 to be turned on.

[0054] The control module 140 of the embodiment of the present invention controls the switch module 110 to close, and the acquisition module 120 acquires the input voltage of the load 200 when the switch module 110 is closed, that is, the first sampling voltage, and the control module 140 acquires the first sampling voltage, and controls the switch module 110 to turn off when the first sampling voltage is acquired; the sampling module 120 acquires the input voltage of the load 200 when the switch module 110 is turned off, that is, the second sampling voltage, and the control module 140 acquires the second sampling voltage; the control module 140 determines whether the state of the power supply VCC1 is normal according to the first sampling voltage, determines whether the state of the load 200 is normal according to the second sampling voltage, and controls the power supply circuit of the load 200 to be turned on when the states of the power supply VCC1 and the load 200 are both normal. The power output control device provided by the embodiment of the present invention can detect the states of the power supply VCC1 and the load 200 to which it is connected, and control whether the load 200 is powered on according to the detection result, which is conducive to avoiding damage to the load 200.

[0055] Figure 2 is a schematic diagram of another power output control device provided by an embodiment of the present invention. Based on the above embodiment, optionally, referring to Figure 2 The switch module 110 includes: at least two output switch units 111 and at least two output control units 112 .

[0056] The output switch units 111 are connected in series, the first output switch unit 111 is also connected to the power supply VCC1, the last output switch unit 111 is also connected to the sampling module 120, the output switch units 111 are connected to the output control units 112 one by one, and the output control units 112 are also connected to the control module 140; the output control unit 112 is used to drive the output switch unit 111 to close; the output switch unit 111 is used to control the conduction or disconnection of the power supply circuit of the load 200.

[0057] Specifically, the switch module 110 operates according to the control instruction of the control module 140 , that is, the switch module 110 controls the on or off of the power supply circuit of the load 200 according to the control instruction of the control module 140 .

[0058] When the control module 140 controls the conduction of the power supply circuit of the load 200, the control module 140 generates a closing instruction, and the output control unit 112 obtains the closing instruction. The output control unit 112 drives the output switch unit 111 according to the closing instruction of the control module 140, and the output switch unit 111 is turned on under the drive of the output control unit 112, and the power supply circuit of the load 200 is turned on; when the control module 140 controls the shutoff of the power supply circuit of the load 200, the control module 140 generates a shutoff instruction, and the output control unit 112 obtains the shutoff instruction. The output control unit 112 stops driving the output switch unit 111 according to the closing instruction of the control module 140, and at this time, the output switch unit 111 is turned off, and the power supply circuit of the load 200 is shut off.

[0059] It should be noted that, since the output switch units 111 in the switch module 110 are connected in series, the switch module 110 is turned on when and only when the output switch units 111 in the switch module 110 are all turned on. This embodiment controls the conduction of the switch module 110 by connecting a plurality of output switch units 111 in series, which is helpful to avoid the switch module 110 from being mis-conducted under the influence of interference signals.

[0060] Figure 3 FIG. 1 is a schematic diagram of another power output control device provided by an embodiment of the present invention. Figure 3 The output control unit includes: a control filter subunit 1121 and a control drive subunit 1122.

[0061] The first end of the control filter subunit 1121 is connected to the control module 140, the second end of the control filter subunit 1121 is connected to the first end of the control driver subunit 1122, the second end of the control driver subunit 1122 is connected to the output switch unit 111, and the third end of the control driver subunit 1122 is grounded.

[0062] Among them, continue to refer to Figure 3 The control filter subunit 1121 includes: a control filter resistor R1 and a control filter capacitor C1.

[0063] The first end of the control filter resistor R1 is connected to the control module 140, the second end of the control filter resistor R2 is connected to the control driving subunit 1122, the first end of the control filter capacitor C1 is connected to the second end of the control filter resistor R1, and the second end of the control filter capacitor C1 is grounded.

[0064] Continue to refer to Figure 3 , the control driving subunit 1122 includes: a control driving switch tube Q1.

[0065] The control end of the control-driven switch tube Q1 serves as the first end of the control-driven subunit 1122, the input end of the control-driven switch tube Q1 serves as the second end of the control-driven subunit 1122, and the output end of the control-driven switch tube Q3 serves as the third end of the control-driven subunit 1122. It should be noted that a control-driven current-limiting resistor R2 may also be provided in the control-driven subunit 1122 to limit the magnitude of the current flowing through the control-driven switch tube Q1. The control-driven current-limiting resistor R2 may be provided between the input end of the control-driven switch tube Q1 and the output switch unit 111, or may be provided between the output end of the control-driven switch tube Q1 and the ground. The setting position of the control-driven current-limiting resistor R2 may be provided according to actual needs, and this embodiment does not limit this.

[0066] Figure 4 FIG. 1 is a schematic diagram of another power output control device provided by an embodiment of the present invention. Figure 4 The output switch unit 111 includes: an output resistor R3 and an output switch tube Q2.

[0067] The first end of the output resistor R3 is connected to the power supply VCC1 , the second end of the output resistor R3 is connected to the control end of the output switch tube Q2 , the input end of the output switch tube Q2 is connected to the power supply VCC1 , and the output end of the output switch tube Q3 is connected to the load 200 .

[0068] Specifically, after the output control unit 112 obtains the closing instruction or the closing instruction of the control module 140, the output control unit 112 controls the level of the control end of the output switch tube Q2 according to the obtained instruction, thereby realizing the control of the conduction or shutdown of the output switch tube Q2, and then controlling the conduction or shutdown of the power supply circuit of the load 200.

[0069] Figure 5 FIG. 1 is a schematic diagram of another power output control device provided by an embodiment of the present invention. Figure 5 The sampling module 120 includes: a sampling voltage dividing unit 121, a first sampling filtering unit 122 and a second sampling filtering unit 123.

[0070] The first end of the sampling voltage divider unit 121 is connected to the switch module 110, the second end of the sampling voltage divider unit 121 is grounded, the third end of the sampling voltage divider unit 121 is connected to the control module 140, the first sampling filter unit 122 is connected between the second end of the sampling voltage divider unit 121 and the third end of the sampling voltage divider unit 121, and the second sampling filter unit 123 is connected in parallel with the sampling voltage divider unit 121; the sampling voltage divider unit 121 is used to perform voltage division sampling on the input voltage of the load 200; the first sampling filter unit 122 is used to filter out interference in the sampled voltage; the second sampling filter unit 123 is used to filter out interference caused by voltage sampling.

[0071] Exemplarily, the sampling voltage-dividing unit 121 includes a first voltage-dividing resistor R4 and a second voltage-dividing resistor R5. The first voltage-dividing resistor R4 and the second voltage-dividing resistor R5 are connected in series, the first voltage-dividing resistor R4 is also connected to the switch module 110, the second voltage-dividing resistor R5 is also connected to the ground, and the connection point of the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5 is connected to the control module 140. The voltage-dividing ratio of the sampling voltage-dividing unit 121 is related to the ratio of the resistance value of the first voltage-dividing resistor R4 and the resistance value of the second voltage-dividing resistor R5. In practical applications, the voltage-dividing ratio of the sampling voltage-dividing unit 121 can be set according to actual needs, and this embodiment does not limit this. The first sampling filter unit 122 includes a first sampling filter capacitor C2. The second sampling filter unit 123 includes a second sampling filter capacitor C3.

[0072] Figure 6 FIG. 1 is a schematic diagram of another power output control device provided by an embodiment of the present invention. Figure 6 , the clamping module 130 includes: a clamping diode D1.

[0073] An anode terminal of the clamp diode D1 is connected to the detection power supply VCC2 , and a cathode terminal of the clamp diode D2 is connected to the load 200 .

[0074] Specifically, the voltage of the power supply VCC1 is higher than the voltage of the detection power supply VCC2. When the switch module 110 is closed, the potential of the cathode end of the clamping diode D1 is higher than the potential of the anode end of the clamping diode D1. At this time, the clamping diode D1 is cut off, and the connection between the detection power supply VCC2 and the load 200 is disconnected; when the switch module 110 is turned off, the potential of the cathode end of the clamping diode D1 is lower than the potential of the anode end of the clamping diode D1. At this time, the clamping diode D1 is turned on, and the connection between the detection power supply VCC2 and the load is turned on. Optionally, continue to refer to Figure 6The clamp module 130 may also be provided with a clamp current limiting resistor R6 to limit the current flowing through the clamp diode D1, thereby protecting the clamp diode D1. The clamp current limiting resistor R6 may be provided, for example, between the anode end of the clamp diode D1 and the detection power supply VCC2.

[0075] Figure 7 FIG. 1 is a schematic diagram of another power output control device provided by an embodiment of the present invention. Figure 7 , the power output control device also includes: a current limiting module 150.

[0076] The current limiting module 150 is connected between the power supply VCC1 and the switch module 110; the current limiting module 150 is used to limit the current output by the power supply VCC1. Exemplarily, the current limiting module 150 includes: a first current limiting resistor R7 and a second current limiting resistor R8. The first end of the first current limiting resistor R7 is connected to the power supply VCC1, the second end of the first current limiting resistor R7 is connected to the switch module 110, and the second current limiting resistor R8 is connected in parallel with the first current limiting resistor R7.

[0077] The embodiment of the present invention also provides a power output control method. Figure 8 1 is a flow chart of a power output control method provided by an embodiment of the present invention. Figure 1 The power output control method is executed by the control module 140 of the power output control device provided by any of the above embodiments, and the power output control device includes: a switch module 110, a sampling module 120, a clamping module 130 and a control module 140. Figure 8 , the power output control method comprises:

[0078] S110, control the switch module to close.

[0079] Specifically, the control module generates a closing instruction, the switch module obtains the closing instruction, and performs a closing action according to the closing instruction.

[0080] S120 , obtaining a first sampled voltage collected by the sampling module when the switch module is closed.

[0081] Specifically, when the switch module is closed, the power supply circuit between the power supply and the load is turned on. At this time, the sampling module detects the input voltage of the load and generates a first sampling voltage.

[0082] S130, control the switch module to turn off.

[0083] Specifically, the control module obtains the first sampled voltage of the sampling module, and generates a shutdown instruction when the first sampled voltage is obtained. The switch module obtains the shutdown instruction, and performs a shutdown action according to the shutdown instruction.

[0084] S140, obtaining a second sampled voltage collected by the sampling module when the switch module is turned off.

[0085] Specifically, when the switch module is turned off, the power supply circuit between the power supply and the load is turned off, and the sampling module detects the input voltage of the load and generates a second sampling voltage. It should be noted that when the switch module is turned off, the input voltage of the load is provided by the detection power supply.

[0086] S150, determine whether the first sampling unit is equal to the first preset voltage and whether the second sampling voltage is not equal to zero; if the first sampling unit is equal to the first preset voltage and the second sampling voltage is not equal to zero, execute S160; if the first sampling unit is not equal to the first preset voltage and / or the second sampling voltage is equal to zero, execute S170.

[0087] Specifically, when the first sampling voltage is equal to the first preset voltage, the state of the power supply is normal; when the first sampling voltage is not equal to the first preset voltage, the state of the power supply is abnormal. Since the impedance of the load is zero when the load is short-circuited, the input voltage of the load collected by the sampling module is zero when the load is short-circuited, that is, the second sampling voltage is zero, and the second sampling voltage is not equal to the second preset voltage. When the second sampling voltage is equal to zero, the state of the load is abnormal; when the second sampling voltage is not equal to zero, the state of the load is normal. When the state of the power supply is normal and the state of the load is normal, the control module generates a closing instruction to control the power supply circuit of the load to be turned on. When the state of the power supply is abnormal and / or the state of the load is abnormal, the control module generates a shut-down instruction to control the power supply circuit of the load to be turned off.

[0088] S160, controlling the switch module to close so that the power supply circuit of the load is turned on.

[0089] Specifically, the switch module obtains the closing instruction and performs a closing action according to the closing instruction.

[0090] S170, controlling the switch module to turn off so as to cut off the power supply circuit of the load.

[0091] Specifically, the switch module obtains the shutdown instruction and performs a shutdown action according to the shutdown instruction.

[0092] The power output control method provided by the embodiment of the present invention can detect the status of the power supply and the load according to the first sampling voltage and the second sampling voltage, and control whether the load is powered on according to the detection result, which is conducive to avoiding load damage.

[0093] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0094] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power output control device, characterized in that: include: Switch module, sampling module, clamp module and control module; The switch module is connected to the sampling module, the sampling module is also connected to the clamping module, the control module and the load respectively, the switch module is also connected to the control module and the power supply respectively, and the clamping module is also connected to the detection power supply; The switch module is used to control the on or off of the power supply circuit of the load; the sampling module is used to collect the input voltage of the load; the clamping module is used to prevent the power supply from being connected to the detection power supply; the control module is used to control whether the power supply circuit of the load is on based on the first sampling voltage collected by the sampling module when the switch module is closed and the second sampling voltage collected by the sampling module when the switch module is turned off.

2. The power output control device according to claim 1, characterized in that: The switch module comprises: at least two output switch units and at least two output control units; The output switch units are connected in series, the first output switch unit is also connected to the power supply, the last output switch unit is also connected to the sampling module, the output switch units are connected to the output control units one by one, and the output control units are also connected to the control module; The output control unit is used to drive the output switch unit to close; the output switch unit is used to control the on or off of the power supply circuit of the load.

3. The power output control device according to claim 2, characterized in that: The output control unit comprises: a control filter subunit and a control drive subunit; The first end of the control filter subunit is connected to the control module, the second end of the control filter subunit is connected to the first end of the control drive subunit, the second end of the control drive subunit is connected to the output switch unit, and the third end of the control drive subunit is grounded.

4. The power output control device according to claim 3, characterized in that: The control filter subunit includes: a control filter resistor and a control filter capacitor; The first end of the control filter resistor is connected to the control module, the second end of the control filter resistor is connected to the control drive subunit, the first end of the control filter capacitor is connected to the second end of the control filter resistor, and the second end of the control filter capacitor is grounded.

5. The power output control device according to claim 3, characterized in that: The control driving subunit comprises: a control driving switch tube; The control end of the control driving switch tube serves as the first end of the control driving subunit, the input end of the control driving switch tube serves as the second end of the control driving subunit, and the output end of the control driving switch tube serves as the third end of the control driving subunit.

6. The power output control device according to claim 2, characterized in that: The output switch unit comprises: an output resistor and an output switch tube; The first end of the output resistor is connected to the power supply, the second end of the output resistor is connected to the control end of the output switch tube, the input end of the output switch tube is connected to the power supply, and the output end of the output switch tube is connected to the load.

7. The power output control device according to claim 1, characterized in that: The sampling module includes: a sampling voltage dividing unit, a first sampling filtering unit and a second sampling filtering unit; The first end of the sampling voltage divider unit is connected to the switch module, the second end of the sampling voltage divider unit is grounded, the third end of the sampling voltage divider unit is connected to the control module, the first sampling filter unit is connected between the second end of the sampling voltage divider unit and the third end of the sampling voltage divider unit, and the second sampling filter unit is connected in parallel with the sampling voltage divider unit; The sampling voltage-dividing unit is used to perform voltage-dividing sampling on the input voltage of the load; the first sampling filtering unit is used to filter out interference in the sampled voltage; and the second sampling filtering unit is used to filter out interference generated by voltage sampling.

8. The power output control device according to claim 1, characterized in that: The clamping module comprises: a clamping diode; An anode terminal of the clamping diode is connected to the detection power supply, and a cathode terminal of the clamping diode is connected to the load.

9. The power output control device according to claim 1, characterized in that: Also includes: Current limiting module; The current limiting module is connected between the power supply and the switch module; The current limiting module is used to limit the current output by the power supply.

10. A power output control method, characterized in that: The method is executed by a control module of a power output control device according to any one of claims 1 to 9, wherein the power output control device comprises: a switch module, a sampling module, a clamping module and a control module; and the power output control method comprises: Controlling the switch module to close; Acquire a first sampled voltage collected by the sampling module when the switch module is closed; Controlling the switch module to turn off; Acquire a second sampled voltage collected by the sampling module when the switch module is turned off; If the first sampling unit voltage is equal to a first preset voltage and the second sampling voltage is not equal to zero, controlling the switch module to close so that the power supply circuit of the load is turned on; If the first sampling unit voltage is not equal to the first preset voltage and / or the second sampling voltage is equal to zero, the switch module is controlled to be turned off so that the power supply circuit of the load is turned off.

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