Switching control circuit, power supply device, and power utilization system

Abstract

The application relates to a switch control circuit, a power supply device and a power utilization system. The switch control circuit comprises two switch channels, each of which comprises a switch circuit, a control circuit connected to the switch circuit and a sampling circuit connected to the switch circuit and sampling an output voltage signal of the switch circuit. The switch circuits in the two switch channels are connected in sequence, the switch circuit at the first position is connected to a power supply voltage, and the switch circuit at the last position is connected to a load device. The control circuit in one of the two switch channels is also connected to the sampling circuit in the other switch channel to receive the output voltage signal sampled by the sampling circuit in the other switch channel. The control circuits in the two switch channels are connected to transmit and receive the output voltage signals. The control circuit is used for controlling the corresponding switch circuit based on the output voltage signal transmitted by the sampling signal and the output voltage signal output by the other control circuit. The switch control circuit has high safety and can improve the use safety of the load device.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a switch control circuit, power supply device and power consumption system. Background Technology

[0002] Electrical equipment is typically powered on and off using switching devices. However, if electrical equipment is powered on using a faulty or malfunctioning switching device, the equipment may fail to shut down safely, resulting in high operational safety risks and low safety. Utility Model Content

[0003] Therefore, it is necessary to provide a switch control circuit, power supply equipment, and power system that can improve the operational safety of electrical equipment.

[0004] A switch control circuit, comprising:

[0005] A switching channel, comprising a switching circuit, a control circuit connected to the switching circuit, and a sampling circuit, wherein the sampling circuit is used to sample the output voltage signal of the switching circuit;

[0006] The number of switching channels is two, and the switching circuits in the two switching channels are connected sequentially. The first switching circuit is connected to the power supply voltage, and the last switching circuit is used to connect to the load device. The control circuit in one switching channel is also connected to the sampling circuit in the other switching channel to receive the output voltage signal sampled and output by the other sampling circuit.

[0007] The control circuits in the two switching channels are connected, and the two control circuits are used to transmit the received output voltage signal to each other;

[0008] The control circuit is used to control the corresponding switching circuit based on the output voltage signal output by the connected sampling circuit and the output voltage signal transmitted by another control circuit.

[0009] In one embodiment, the switching circuit includes: a switching device and a driving unit; a first terminal of the switching device is used to connect to a power supply voltage, a second terminal of the switching device is used to output a power supply voltage, a control terminal of the switching device is connected to the driving unit, and the driving unit is also connected to the control circuit in the switching channel;

[0010] The control circuit is used to control the switching device to be turned on or off through the drive unit.

[0011] In one embodiment, the driving unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a driving transistor; a first end of the first resistor is connected to the control electrode of the switching device and a first end of the second resistor, a second end of the second resistor is connected to the first electrode of the switching device, a second end of the first resistor is connected to the first electrode of the driving transistor, the control electrode of the driving transistor is connected to the first end of the third resistor and the first end of the fourth resistor, a second end of the third resistor is connected to the control circuit, and a second end of the fourth resistor and the second electrode of the driving transistor are grounded.

[0012] In one embodiment, the sampling circuit includes a first sampling resistor and a second sampling resistor; a first end of the first sampling resistor is connected to a switching circuit in the switching channel, a second end of the first sampling resistor is connected to a first end of the second sampling resistor and a control circuit in another switching channel, and a second end of the second sampling resistor is grounded.

[0013] In one embodiment, the sampling circuit further includes a first capacitor; a first terminal of the first capacitor is connected to a second terminal of the first sampling resistor, and the second terminal of the first capacitor is grounded.

[0014] In one embodiment, the switch control circuit further includes a soft-start circuit; the soft-start circuit is connected in parallel with the target switch circuit, which is a switch circuit in one of the switch channels; the soft-start circuit is also connected with a target control circuit, which is a control circuit in the switch channel where the target switch circuit is located;

[0015] The target control circuit is also used to control the soft-start circuit to conduct in order to precharge the load device.

[0016] In one embodiment, the soft-start circuit includes a diode, a fifth resistor, and a soft-start switch circuit, wherein the anode of the diode is connected to a first terminal of the target switch circuit, and the cathode of the diode is connected to a second terminal of the target switch circuit via the fifth resistor and the soft-start switch circuit.

[0017] The target control circuit is connected to the soft-start switch circuit and is used to control the soft-start switch circuit to be turned on or off.

[0018] In one embodiment, the switch control circuit further includes an alarm circuit, which is connected to at least one of the control circuits;

[0019] When the control circuit determines that an abnormal switching circuit exists based on the output voltage signal output by the connected sampling circuit and the output voltage signal transmitted by another control circuit, it outputs an alarm signal to the alarm circuit so that the alarm circuit issues an alarm.

[0020] A power supply device includes a power supply and a switch control circuit as described above, wherein the power supply is connected to the switch circuit located first.

[0021] An electrical system includes a load device and a power supply device as described above.

[0022] The aforementioned switch control circuit, power supply equipment, and power system include two switch channels. Each switch channel includes a switch circuit, a control circuit connecting the switch circuits, and a sampling circuit. The sampling circuit samples the output voltage signal of the switch circuit. The switch circuits in the two switch channels are connected sequentially, with the first switch circuit connected to the power supply voltage and the last switch circuit connected to the load device. The control circuit in one switch channel is also connected to the sampling circuit in the other switch channel to receive the output voltage signal of the corresponding switch circuit transmitted by the other sampling circuit. The control circuits in the two switch channels are connected, and the two control circuits transmit the received output voltage signals to each other. The control circuits control the corresponding switch circuit based on the output voltage signal transmitted by the sampling signal and the output voltage signal output by the other control circuit. Therefore, if the switch circuit in one channel fails, the switch circuit in the other channel can power off the device. This redundant design of the two switch channels increases the safety of the switch control circuit. When two switching channels are operating (e.g., power-on / power-off), the sampling signals from the two channels are cross-feedbacked, allowing any control circuit to monitor the output voltage of its own channel's switching circuit as well as the output voltage of the switching circuit in the other channel. Based on this cross-checking of the two output voltages, the circuit can determine whether the two switching circuits are in an abnormal or malfunctioning state. This allows for the control of the two switching circuits to either turn on or off based on their status, thereby improving the reliability of the switching control circuit and enhancing the safety of the load equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the mode structure of a switch control circuit according to one embodiment;

[0025] Figure 2 This is a schematic diagram of the mode structure of a switch control circuit according to another embodiment;

[0026] Figure 3 This is a schematic diagram of the circuit structure of a switch control circuit according to one embodiment;

[0027] Figure 4 This is a schematic diagram of the circuit structure of a driving unit according to one embodiment. Detailed Implementation

[0028] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0030] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0031] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0032] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0033] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0034] In some embodiments, the switch control circuit includes a switch channel, which includes a switch circuit, a control circuit, and a sampling circuit. The sampling circuit is connected to the switch circuit and is used to sample the output voltage of the switch circuit and output the sampled output voltage signal to the control circuit. The control circuit is connected to the switch circuit and is used to control the on or off state of the switch circuit.

[0035] The number of switching channels is set according to the actual situation. In some embodiments, the number of switching channels is two. See also Figure 1 The two switching channels are designated as a first switching channel 100 and a second switching channel 200. Both switching channels have identical structures, including a switching circuit, a control circuit, and a sampling circuit. Specifically, the first switching channel 100 includes a first switching circuit 110, a first control circuit 120, and a first sampling circuit 130. The second switching channel 200 includes a second switching circuit 210, a second control circuit 220, and a second sampling circuit 230.

[0036] The switching circuits in the two switching channels are connected sequentially. The first switching circuit is connected to the power supply voltage, and the last switching circuit is used to connect to the load device. (Continuing with...) Figure 1 For example, a first switching circuit 110 and a second switching circuit 210 are connected sequentially. The first terminal of the first switching circuit 110 is connected to the power supply voltage VCCIN, and the second terminal of the first switching circuit 110 is connected to the first terminal of the second switching circuit 210. The second terminal of the second switching circuit 210 is used to connect to the load device. The controlled terminal of the first switching circuit 110 is connected to a first control circuit 120, which controls the first switching circuit 110 to be turned on or off. The controlled terminal of the second switching circuit 210 is connected to a second control circuit 220, which controls the second switching circuit 210 to be turned on or off. A first sampling circuit 130 is connected to the second terminal of the first switching circuit 110 to sample the output voltage signal of the first switching circuit 110. A second sampling circuit 230 is connected to the second terminal of the second switching circuit 210 to sample the output voltage signal of the second switching circuit 210.

[0037] When both the first switch circuit 110 and the second switch circuit 210 are turned on, the output voltage VCCOUT of the second switch circuit 210 is output to the load device as the power supply for the load device.

[0038] The control circuit in one switching channel is also connected to the sampling circuit in another switching channel to receive the output voltage signal of the corresponding switching circuit transmitted by the other sampling circuit. (See also...) Figure 1The second control circuit 220 is also connected to the first sampling circuit 130 to receive the first output voltage signal VADC1 obtained by the first sampling circuit 130 sampling the output voltage of the first switching circuit 110. The first control circuit 120 is also connected to the second sampling circuit 230 to receive the second output voltage signal VADC2 obtained by the second sampling circuit 230 sampling the output voltage of the second switching circuit 210.

[0039] The control circuits in the two switching channels are connected, and the two control circuits are used to transmit the received output voltage signals to each other. Specifically, the first control circuit 120 is connected to the second control circuit 220. After receiving the second output voltage signal VADC2 transmitted by the second sampling circuit 230, the first control circuit 120 transmits the second output voltage signal VADC2 to the second control circuit 220. After receiving the first output voltage signal VADC1 output by the first sampling circuit 130, the second control circuit 220 transmits the first output voltage signal VADC1 to the first control circuit 120.

[0040] The control circuit is used to control the corresponding switching circuit based on the output voltage signal from the connected sampling circuit and the output voltage signal from another control circuit.

[0041] Specifically, the first control circuit 120 controls the first switching circuit 110 based on the second output voltage signal VADC2 output by the second sampling circuit 230 and the first output voltage signal VADC1 transmitted by the second control circuit 220. The second control circuit 220 controls the second switching circuit 210 based on the first output voltage signal VADC1 transmitted by the first sampling circuit 130 and the second output voltage signal VADC2 transmitted by the first control circuit 120.

[0042] After the first control circuit 120 and the second control circuit 220 communicate and transmit the received signals, they perform mutual checks on the received signals. Based on the first output voltage signal VADC1 and the second output voltage signal VADC2, they determine whether there is any abnormality in the first switch circuit 110 and the second switch circuit 210. Then, based on the state of the first switch circuit 110 and the second switch circuit 210, they control the first switch circuit 110 and the second switch circuit 210 respectively.

[0043] For example, when the load device is powered on (i.e., power is supplied to the load device), in the first stage of the power-on process, the power supply voltage VCCIN is connected, the first control circuit 120 controls the first switch circuit 110 to turn off, the second control circuit 220 controls the second switch circuit 210 to turn off, and the output voltage VCCOUT should be 0. At this time, if the received second output voltage signal VADC2 is 0 and the first output voltage signal VADC1 is 0, then the communication and mutual detection between the two control circuits are normal, and the second stage of the power-on process begins.

[0044] If the first output voltage signal VADC1 is not 0, or if neither the first output voltage signal VADC1 nor the second output voltage signal VADC2 is 0, then the communication and mutual detection between the two control circuits is abnormal, indicating that the first switch circuit 110 has a short circuit failure problem, or both the first switch circuit 110 and the second switch circuit 210 have short circuit failure problems.

[0045] In the second stage of the power-on process, the first control circuit 120 controls the first switching circuit 110 to conduct, and the second control circuit 220 controls the second switching circuit 210 to turn off. After waiting for a period of time to ensure that the switching devices in the first switching circuit 110 are turned on and the first output voltage signal VADC1 can be established normally, the two control circuits communicate and check each other. If the second output voltage signal VADC2 is 0 and the first output voltage signal VADC1 is a high-level signal (e.g., the converted digital signal is 1), then the communication and mutual check between the two control circuits is normal, and the power supply circuit of the switch control circuit is normal. If the first output voltage signal VADC1 is not a high-level signal, it indicates that the first switching circuit 110 is not conducting normally and there is an abnormality. If the first output voltage signal VADC1 is a high-level signal and the second output voltage signal VADC2 is not 0, it indicates that the second switching circuit 210 has a short-circuit failure. Thus, the detection of whether there is an abnormality in the two switching circuits is achieved during the power-on process. Furthermore, when it is determined that there is no abnormality in the two switching circuits, the two switching circuits can be controlled to conduct separately to make the power supply circuit of the switch control circuit conduct and supply power to the load equipment. When an abnormality is detected in any of the switching circuits, the two control circuits respectively control the two switching circuits to shut down, thereby stopping the power supply and improving circuit safety.

[0046] During the power-down process (disconnecting the power supply voltage to the electrical equipment), the first control circuit 120 controls the first switch circuit 110 to turn off, and the second control circuit 220 controls the second switch circuit 210 to turn off, thereby disconnecting the power supply circuit of the power supply control circuit. Considering factors such as the closing delay time of the switching devices in the switch circuit, the two control circuits can perform mutual communication checks after a certain period of time. If the first output voltage signal VADC1 is 0 and the second output voltage signal VADC2 is 0, it indicates that the power supply circuit has been safely disconnected. If the mutual check between the two control circuits is abnormal, for example, the first output voltage signal VADC1 is not 0 and the second output voltage signal VADC2 is 0, it indicates that the first switch circuit 110 has a short circuit failure. Thus, the detection of whether the switch circuit is abnormal during the power-down process is realized. Furthermore, if the two control circuits detect that either switch circuit is abnormal, they can also prevent the next power-on to improve the safety of the load equipment.

[0047] It is understandable that the dual-channel redundant architecture composed of the first switching channel 100 and the second switching channel 200 can still control the other switching circuit in the event of a single point of failure. For example, if the first switching circuit 110 has a short-circuit failure, it can still control the second switching circuit 210 to turn on or off. Thus, by controlling the other switching circuit to turn off, the power supply to the load device can be effectively cut off, achieving safe power-off.

[0048] The aforementioned switch control circuit, power supply equipment, and power system include two switch channels. Each switch channel includes a switch circuit, a control circuit connecting the switch circuits, and a sampling circuit. The sampling circuit samples the output voltage signal of the switch circuit. The switch circuits in the two switch channels are connected sequentially, with the first switch circuit connected to the power supply voltage and the last switch circuit connected to the load device. The control circuit in one switch channel is also connected to the sampling circuit in the other switch channel to receive the output voltage signal of the corresponding switch circuit transmitted by the other sampling circuit. The control circuits in the two switch channels are connected, and the two control circuits transmit the received output voltage signals to each other. The control circuits control the corresponding switch circuit based on the output voltage signal transmitted by the sampling signal and the output voltage signal output by the other control circuit. Therefore, if the switch circuit in one channel fails, the switch circuit in the other channel can power off the device. This redundant design of the two switch channels increases the safety of the switch control circuit. When both switching channels are operating, the sampling signals from the two channels are cross-feedbackd, allowing any control circuit to monitor the output voltage of its own channel's switching circuit as well as the output voltage of the switching circuit in the other channel. This cross-checking of the two output voltages determines whether the two switching circuits are in an abnormal or malfunctioning state. Based on the state of the two switching circuits, the circuits are controlled to turn on or off, improving the reliability of the switching control circuit and enhancing the safety of the load equipment.

[0049] In other embodiments, the number of switching channels can be two or more, for example, three. When there are multiple switching channels, the control circuits in each switching channel communicate and perform mutual checks. Adjusting the number of switching channels can improve the reliability of the switching control circuit.

[0050] In some embodiments, the number of switching circuits in a switching channel may also be multiple. For example, the first switching channel 100 may include two first switching circuits 110 connected in series to further improve the reliability of the switching control circuit.

[0051] In some embodiments, the switch control circuit further includes an alarm circuit, which is connected to at least one control circuit. The control circuit connected to the alarm circuit is configured to output an alarm signal to the alarm circuit, so that the alarm circuit will issue an alarm, if it determines that an abnormal switch circuit exists based on the output voltage signal output by the connected sampling circuit and the output voltage signal transmitted by another control circuit.

[0052] For example, the alarm circuit is connected to the first control circuit 120. When the first control circuit 120 determines that there is an abnormality in the first switch circuit 110 or the second switch circuit 210 based on the first output voltage signal VADC1 and the second output voltage signal VADC2, the first control circuit 120 outputs an alarm signal to the alarm circuit so that the alarm circuit issues an alarm.

[0053] The method by which the first control circuit 120 determines whether the first switching circuit 110 or the second switching circuit 210 is abnormal based on the first output voltage signal VADC1 and the second output voltage signal VADC2 is not limited. For example, referring to the above embodiment, the determination can be made by mutual detection with the second switching circuit 220 during the first stage of the power-on process, the second stage of the power-on process, or the power-off process.

[0054] The form of the alarm circuit is not limited; it can be an audible and visual alarm circuit, an LED display module, a voice prompt module, etc. When using an audible and visual alarm circuit, upon receiving an alarm signal, it will simultaneously emit sound and light signals, such as flashing lights, to attract the attention of staff. When using an LED display module, the LED display module can display abnormal information, such as "The first switch circuit is malfunctioning; please check," allowing staff to more intuitively understand the problem and improve the efficiency of troubleshooting.

[0055] In this embodiment, when an abnormality is detected in the first switch circuit 110 or the second switch circuit 210, an alarm can be issued through the alarm circuit, enabling staff to promptly detect the abnormality and take corresponding measures, thereby improving the safety of the switch control circuit.

[0056] In some embodiments, the switch control circuit further includes a soft-start circuit. The soft-start circuit is connected in parallel with a target switch circuit, which is a switch circuit in a switch channel. The soft-start circuit is also connected to a target control circuit, which is a control circuit in the switch channel where the target switch circuit is located; the target control circuit is also used to control the soft-start circuit to turn on or off. When the soft-start circuit is on, it pre-charges the load device according to the power supply voltage.

[0057] As an example, such as Figure 2 As shown, the target switching circuit is the second switching circuit 210, and the target control circuit is the second control circuit 220. The soft-start circuit 300 is connected in parallel with the second switching circuit 210, meaning that the first terminal of the soft-start circuit 300 is connected to the first terminal of the second switching circuit 210, and the second terminal of the soft-start circuit 300 is connected to the second terminal of the second switching circuit 210. The soft-start circuit 300 is also connected to the second control circuit 220, which is used to control the soft-start circuit 300 to be turned on or off. It can be understood that in other embodiments, the target switching circuit can be the first switching circuit 110, and the target control circuit can be the first control circuit 120.

[0058] It should be noted that in practical applications, the load device may contain a large capacitor. For example, when the load device is a collaborative robot, humanoid robot, or low-voltage servo joint drive product, the device body includes a motor and a drive motor system. The transient power of the drive motor system is relatively large (load power ranges from tens to kilowatts). By setting a large capacitor in the circuit of the drive motor system, a large transient current and filtering functions can be provided, ensuring stable operation of the device body. However, due to the large capacitive load (large capacitor) in the drive motor system circuit, excessive transient turn-on current upon power-up poses a risk. For example, when the power control cabinet connected to the collaborative robot, humanoid robot, or low-voltage servo joint drive product outputs power, excessive transient turn-on current upon power-up may cause abnormal output of the power control cabinet or damage to the output circuit due to overcurrent, etc. To address the issue of large transient peak current, if MOS1 and MOS2 are selected with large current-carrying capacity devices or multiple devices are connected in parallel, the cost will be higher, the devices will occupy more PCB space, and the size of the power control cabinet or equipment will increase.

[0059] In this embodiment, during the power-on process, the soft-start circuit 300 can be turned on before the second switching circuit 210 is turned on. The soft-start circuit 300 pre-charges the large capacitor in the load device, suppressing transient overcurrent in the power supply circuit. This avoids damage to the switching devices in the first switching circuit 110 and the second switching circuit 210 due to excessive current, thus improving circuit safety.

[0060] Furthermore, by controlling the first switch circuit 110, the second switch circuit 210, and the soft start circuit 300 respectively, and by having the two control circuits communicate and check each other, it is possible to detect whether there are any abnormalities in the first switch circuit 110, the second switch circuit 210, and the soft start circuit 300.

[0061] As an example, when the load device is powered on, in the first stage of the power-on process, the power supply voltage VCCIN is connected, the first control circuit 120 controls the first switching circuit 110 to turn off, and the second control circuit 220 controls the second switching circuit 210 and the soft-start circuit 300 to both turn off. The output voltage VCCOUT should be 0. At this time, if the first output voltage signal VADC1 and the second output voltage signal VADC2 are both 0, the communication and mutual detection between the two control circuits are normal, and the second stage of the power-on process begins.

[0062] If the communication between the two control circuits fails, the control signal connected to the alarm circuit outputs an alarm signal to control the alarm circuit to sound an alarm and terminate the power-on process. When the first output voltage signal VADC1 is not 0, or when neither the first output voltage signal VADC1 nor the second output voltage signal VADC2 is 0, it indicates that the first control circuit 120 has a short-circuit failure problem, or that there is a short-circuit failure device in the first switch circuit 110, the second switch circuit 210, and the soft-start circuit 300. This stage can detect whether the first switch circuit 110 has a short-circuit failure.

[0063] In the second stage of the power-on process, the first control circuit 120 controls the first switching circuit 110 to turn on, while the second control circuit 220 still controls the second switching circuit 210 and the soft-start circuit 300 to turn off. After waiting for a period of time to ensure that the switching devices in the first switching circuit 110 are turned on and the first output voltage signal VADC1 can be established normally, the two control circuits communicate and check each other. At this time, if the second output voltage signal VADC2 is 0 and the first output voltage signal VADC1 is a high-level signal (the converted digital signal is 1), then the communication and mutual check between the two control circuits is normal, the power supply circuit of the switch control circuit is normal, and the third stage of the power-on process can be executed.

[0064] If the communication between the two control circuits fails, an alarm signal is output to the alarm circuit to trigger an alarm and terminate the power-on process. If the first output voltage signal VADC1 is not high (not equal to 1), it indicates that the first switch circuit 110 is not conducting properly and is malfunctioning. If the first output voltage signal VADC1 is high and the second output voltage signal VADC2 is not zero, it indicates that the second switch circuit 210 or the soft-start circuit 300 has a short-circuit failure.

[0065] In the third stage of the power-on process, the second control circuit 220 controls the soft-start circuit 300 to turn on, while still controlling the second switching circuit 210 to turn off. The power supply voltage VCCIN pre-charges the large capacitor in the load device through the first switching circuit 110 and the soft-start circuit 300, causing the output voltage VCCOUT of the switch control circuit to gradually rise from 0V, thereby suppressing transient overcurrent. After a period of time, the first control circuit 120 and the second control circuit 220 communicate and check each other. If both the first output voltage signal VADC1 and the second output voltage signal VADC2 are high-level signals, then the communication and mutual check between the two control circuits are normal, the power supply circuit of the switch control circuit is normal, and the fourth stage of the power-on process can be executed.

[0066] If the communication between the two control circuits fails, an alarm signal is output to the alarm circuit to trigger an alarm and the power-on process is terminated. A communication failure is determined when both the first output voltage signal VADC1 and the second output voltage signal VADC2 are not high. The third stage of this power-on process can detect whether the soft-start circuit 300 is malfunctioning.

[0067] In the fourth stage of the power-on process, the second control circuit 220 controls the second switching circuit 210 to turn on. The power supply voltage VCCIN rapidly charges the large capacitor in the load device through the first switching circuit 110 and the second switching circuit 210, causing the output voltage VCCOUT to quickly rise to its final stable value. It can be understood that the current when the power supply voltage VCCIN supplies power to the load device through the first switching circuit 110 and the soft-start circuit 300 is less than the current when the power supply voltage VCCIN supplies power to the load device through the first switching circuit 110 and the second switching circuit 210.

[0068] After the second switch circuit 210 has been turned on for a period of time, the first control circuit 120 can calculate the rise rate of the output voltage VCCOUT based on the voltage amplitude change of the second output voltage signal VADC2, and thus determine whether the second switch circuit 210 is conducting normally. When both the first output voltage signal VADC1 and the second output voltage signal VADC2 are high-level signals, the communication and mutual detection between the two control circuits are normal, the power supply circuit of the switch control circuit is normal, and the power-on process is completed.

[0069] If the communication between the two control circuits fails, an alarm signal is output to the alarm circuit to trigger an alarm and the power-on process is terminated. A communication failure is considered to occur if the first output voltage signal VADC1 is not high and the second output voltage signal VADC2 is not high.

[0070] After the power-on process is completed, the circuit consisting of the first switch circuit 110 and the second switch circuit 210 supplies power to the load equipment. The decision to shut down the soft-start circuit 300 can be made based on actual needs.

[0071] This enables the detection of any abnormalities in the two switching circuits and the soft-start circuit 300 during power-on. Furthermore, when it is determined that neither of the two switching circuits nor the soft-start circuit 300 is abnormal, the two switching circuits can be individually controlled to conduct, thereby connecting the power supply circuit of the corresponding switching control circuit and supplying power to the load device. If any switching circuit is found to be abnormal, both switching circuits and the soft-start circuit 300 can be individually controlled to shut down, stopping power-on and improving circuit safety.

[0072] During the power-down process, the first control circuit 120 controls the first switching circuit 110 to turn off, and the second control circuit 220 controls the second switching circuit 210 and the soft-start circuit 300 to turn off, thereby disconnecting the power supply circuit of the power supply control circuit. Considering factors such as the closing delay time of the switching devices in the switching circuit, the two control circuits can communicate and check each other after a period of time. If the first output voltage signal VADC1 is 0 and the second output voltage signal VADC2 is 0, it indicates that the power supply circuit has been safely disconnected. If the mutual detection between the two control circuits is abnormal, an alarm signal is output to the alarm circuit to issue an alarm. Thus, the detection of whether the two switching circuits and the soft-start circuit 300 are abnormal during the power-down process is realized. Furthermore, if the detection determines that any switching circuit or the soft-start circuit 300 is abnormal, the two control circuits can also prevent the next power-on to improve the safety of the load equipment.

[0073] In actual implementation, the circuit structure of each switch channel can be configured according to the actual situation. In some embodiments, the first control circuit 110 includes a first MCU (Micro Control Unit), and the second control circuit 120 includes a second MCU. The first MCU is connected to the first switch circuit 110, the second sampling circuit 230, and the second MCU. The second MCU is also connected to the first sampling circuit 130 and the second switch circuit 210. This embodiment does not limit the type and model of the two MCUs.

[0074] The sampling circuits in the two switching channels can be either isolated or non-isolated, depending on actual requirements. In some embodiments, the sampling circuit uses a non-isolated voltage sampling circuit, specifically including a first sampling resistor and a second sampling resistor; the first end of the first sampling resistor is connected to the switching circuit in the corresponding switching channel, the second end of the first sampling circuit is connected to the first end of the second sampling resistor and the control circuit in another switching channel, and the second end of the second sampling resistor is grounded.

[0075] Specifically, see Figure 3 The first sampling circuit 130 includes a first sampling resistor R1 and a second sampling resistor R2. The first end of the first sampling resistor R1 is connected to the second end of the first switching circuit 110, and the second end of the first sampling resistor R1 is connected to the first end of the second sampling resistor R2 and the second control circuit 220. The second end of the second sampling resistor R2 is grounded. The second sampling circuit 230 includes two sampling resistors R3 and R4, and the connection structure can be set with reference to the first sampling circuit 130.

[0076] In this embodiment, a voltage sampling circuit is used, which has a simple circuit structure and low circuit cost.

[0077] Furthermore, the sampling circuit also includes a first capacitor; the first end of the first capacitor is connected to the second end of the first sampling resistor, and the second end of the first capacitor is grounded.

[0078] Continue to refer to Figure 3 The first sampling circuit 130 also includes a first capacitor C1, which is connected in parallel with the second sampling resistor R2. The second sampling circuit 230 also includes a second capacitor C2, which is connected in parallel with the resistor R4. The first capacitor C1 and the second capacitor C2 can act as filters, making the first output voltage signal VADC1 and the second output voltage signal VADC2 output to the two control circuits more accurate.

[0079] In other embodiments, other sampling circuit structures can be selected, such as a circuit composed of sampling Zener diodes. When using an isolated sampling circuit, an isolated detection circuit composed of an integrated isolated sampling chip or an optocoupler can be used.

[0080] In some embodiments, the soft-start circuit includes a diode D1, a fifth resistor R5, and a soft-start switch circuit 310. The anode of diode D1 is connected to the target switch circuit (…). Figure 3 In the embodiment, the first terminal of the second switching circuit 210 is connected to the second terminal of the target switching circuit via the fifth resistor R5 and the soft-start switching circuit 310.

[0081] Target control circuit ( Figure 3 In the embodiment, the second control circuit 220 is connected to the soft-start switch circuit 310 to control the soft-start switch circuit 310 to be turned on or off.

[0082] In this embodiment, when the first switching circuit 110 is on, the second switching circuit 210 is off, and the soft-start switching circuit 310 is on, the power supply voltage VCCIN is supplied to the load device through the first switching circuit 110, diode D1, fifth resistor R5, and soft-start switching circuit 310. At this time, the current is expressed as VCCIN / R5, used to pre-charge the large capacitor CL in the load device. The large capacitor CL can be the load capacitor on the drive motor system circuit or the load capacitor on the bus supplying power to the device body. The load resistor RL represents the electrical load in the load device, which can drive the load of the motor system circuit.

[0083] In this embodiment, the soft-start circuit 300 can effectively suppress transient current during power-on, improving circuit safety. Furthermore, the circuit structure is simple and easy to implement.

[0084] In some embodiments, the switching circuit includes a switching device and a driving unit. A first terminal of the switching device is used to receive a power supply voltage, a second terminal of the switching device is used to output a power supply voltage, and a control terminal of the switching device is connected to the driving unit. The driving unit is also connected to a control circuit in the corresponding switching channel, and the control circuit controls the switching device to be turned on or off via the driving unit.

[0085] Reference Figure 3 The first switching circuit 110 includes a first switching device MOS1 and a first driving unit 211. The second switching circuit includes a second switching device MOS2 and a second driving unit 211. The first terminals of the first switching device MOS1 and the second switching device MOS2 are used to receive the power supply voltage, and the second terminals are used to output the power supply voltage. When the first switching circuit 110 and the second switching circuit 210 are connected in sequence, the first terminal of the first switching device MOS1 is connected to the power input terminal to receive the power supply voltage, and the second terminal is connected to the first terminal of the second switching device MOS2 to transmit the power supply voltage to the second switching device MOS2. The second terminal of the second switching device MOS2 is connected to the load device, so that when it is turned on, the power supply voltage is provided to the load device as the output voltage VCCOUT.

[0086] The switching device can be a MOSFET or other devices that can achieve similar functions. The first terminal, second terminal, and control terminal of the switching device need to be determined according to the specific selection of the switching device; this embodiment does not impose any limitations on this.

[0087] In this embodiment, the driving unit can provide appropriate driving signals to the switching device, enabling the switching device to respond to conduction and shutdown actions more quickly, thus achieving faster power-on and power-off. Furthermore, controlling the switching device through the driving unit can achieve isolation between the switching device and the MCU, enhancing circuit safety.

[0088] The drive unit can be selected from isolated circuits, non-isolated circuits, integrated drive circuits, or discrete components, depending on the actual situation. In some embodiments, such as Figure 4 As shown, the driving unit includes a first resistor R6, a second resistor R7, a third resistor R8, a fourth resistor R9, and a driving transistor Q1. The first terminal of the first resistor R6 is connected to the control electrode of the switching device and the first terminal of the second resistor R7. The second terminal of the second resistor R7 is connected to the first electrode of the switching device. The second terminal of the first resistor R6 is connected to the first electrode of the driving transistor Q1. The control electrode of the driving transistor Q1 is connected to the first terminals of the third resistor R8 and the fourth resistor R9. The second terminal of the third resistor R8 is connected to the control circuit. The second terminal of the fourth resistor R9 and the second electrode of the driving transistor Q1 are grounded.

[0089] In this embodiment, a non-isolated drive circuit is used. Compared to an isolated drive circuit, this eliminates the need for complex isolation components (such as optocouplers), significantly reducing the hardware cost. The first resistor R6 and the second resistor R7 control the gate voltage of the switching device and effectively limit current, preventing overcurrent damage. The third resistor R8 and the fourth resistor R9 act as voltage dividers and current limiters, precisely controlling the gate current of the drive transistor Q1 and thus accurately adjusting its on / off state. This allows the drive transistor Q1 to provide a stable and suitable drive signal to the switching device, ensuring accurate operation and precise control of the power supply voltage switching process.

[0090] In some embodiments, the soft-start switch circuit 310 has the same circuit structure as the switch circuit (first switch circuit 110 or second switch circuit 120), including a third switching device MOS3 and a third driving unit 311. The selection of the third switching device MOS3 and the circuit structure of the third driving unit 311 can refer to the above-described switching device and driving unit.

[0091] To better understand the above embodiments, a detailed explanation is provided below with reference to a specific embodiment. Figure 3 The embodiment shown employs redundant control with dual switching channels, which meets functional safety standards. During power-on and power-off processes, it can check for abnormalities in each switching device (MOS1, MOS2, and MOS3).

[0092] This allows for the clear identification of switching device status during load operation. If a faulty switching device is present, power is not applied, preventing the potential safety risk of the load equipment failing to safely shut down after power-on. Adding a soft-start power supply function further enhances circuit stability and safety.

[0093] Specifically, the status of each switching device can be detected using Table 1 below. This allows for the identification of the switching device status during load operation. If any switching device is found to be faulty, power should not be applied again to avoid the potential safety risk of the load equipment failing to safely shut down after power-on. Adding a soft-start power supply function further improves the stability and safety of the circuit.

[0094] The following is a table (Table 1):

[0095] Table 1

[0096]

[0097] This application also provides a power supply device, including a power supply and a switch control circuit. The switch control circuit can be configured as described in the above embodiments, and will not be repeated here. The power supply is connected to the first switch circuit so that the power supply voltage is transmitted from the first switch circuit to the last switch circuit to the load device.

[0098] In practical implementation, power supply equipment can have other functions besides providing power. In some specific embodiments, the power supply equipment can be an electrical control cabinet, and the load equipment can be a collaborative robot, humanoid robot, or other similar devices. The electrical control cabinet not only supplies power to the load equipment but also functions as a main controller for planning the movement of the load equipment.

[0099] This application also provides an electrical system, including a load device and a power supply device, wherein the power supply device can be configured as described in the above embodiments. In some specific embodiments, the load device can be a collaborative robot, a humanoid robot, or other similar device, and the power supply device can be an electrical control cabinet.

[0100] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0101] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0102] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A switch control circuit, characterized in that, include: A switching channel, comprising a switching circuit, a control circuit connected to the switching circuit, and a sampling circuit, wherein the sampling circuit is used to sample the output voltage signal of the switching circuit; The number of switching channels is two, and the switching circuits in the two switching channels are connected sequentially. The first switching circuit is connected to the power supply voltage, and the last switching circuit is used to connect to the load device. The control circuit in one switching channel is also connected to the sampling circuit in the other switching channel to receive the output voltage signal sampled and output by the other sampling circuit. The control circuits in the two switching channels are connected, and the two control circuits are used to transmit the received output voltage signal to each other; The control circuit is used to control the corresponding switching circuit based on the output voltage signal output by the connected sampling circuit and the output voltage signal transmitted by another control circuit.

2. The switch control circuit according to claim 1, characterized in that, The switching circuit includes: a switching device and a driving unit; the first terminal of the switching device is used to connect to a power supply voltage, the second terminal of the switching device is used to output a power supply voltage, the control terminal of the switching device is connected to the driving unit, and the driving unit is also connected to the control circuit in the switching channel. The control circuit is used to control the switching device to be turned on or off through the drive unit.

3. The switch control circuit according to claim 2, characterized in that, The driving unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a driving transistor; the first end of the first resistor is connected to the control electrode of the switching device and the first end of the second resistor, the second end of the second resistor is connected to the first electrode of the switching device, the second end of the first resistor is connected to the first electrode of the driving transistor, the control electrode of the driving transistor is connected to the first end of the third resistor and the first end of the fourth resistor, the second end of the third resistor is connected to the control circuit, and the second end of the fourth resistor and the second electrode of the driving transistor are grounded.

4. The switch control circuit according to claim 1, characterized in that, The sampling circuit includes a first sampling resistor and a second sampling resistor; the first end of the first sampling resistor is connected to the switching circuit in the corresponding switching channel, the second end of the first sampling resistor is connected to the first end of the second sampling resistor and the control circuit in another switching channel, and the second end of the second sampling resistor is grounded.

5. The switch control circuit according to claim 4, characterized in that, The sampling circuit further includes a first capacitor; the first end of the first capacitor is connected to the second end of the first sampling resistor, and the second end of the first capacitor is grounded.

6. The switch control circuit according to any one of claims 1 to 5, characterized in that, The switch control circuit further includes a soft-start circuit; the soft-start circuit is connected in parallel with the target switch circuit, which is a switch circuit in one of the switch channels; the soft-start circuit is also connected to a target control circuit, which is a control circuit in the switch channel where the target switch circuit is located; The target control circuit is also used to control the soft-start circuit to conduct in order to precharge the load device.

7. The switch control circuit according to claim 6, characterized in that, The soft-start circuit includes a diode, a fifth resistor, and a soft-start switch circuit. The anode of the diode is connected to the first terminal of the target switch circuit, and the cathode of the diode is connected to the second terminal of the target switch circuit via the fifth resistor and the soft-start switch circuit. The target control circuit is connected to the soft-start switch circuit and is used to control the soft-start switch circuit to be turned on or off.

8. The switch control circuit according to any one of claims 1 to 5, characterized in that, The switch control circuit further includes an alarm circuit, and the alarm circuit is connected to at least one of the control circuits. When the control circuit determines that an abnormal switching circuit exists based on the output voltage signal output by the connected sampling circuit and the output voltage signal transmitted by another control circuit, it outputs an alarm signal to the alarm circuit so that the alarm circuit issues an alarm.

9. A power supply device, characterized in that, It includes a power supply and a switch control circuit as claimed in any one of claims 1-8, wherein the power supply is connected to the switch circuit located first.

10. An electrical system, characterized in that, Includes load devices and power supply devices according to claim 9.

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