Safety lock circuit, motor driving module and fitness equipment

Abstract

The embodiment of the utility model discloses a safety lock circuit, a motor driving module and fitness equipment. According to the technical scheme, the safety signal interface module is connected with the safety lock device, the output end of the safety signal interface module is connected with the lower pipe control end of the pre-driving module, and the output end of the signal control module is connected with the upper pipe control end of the pre-driving module; the safety signal interface module outputs a first level signal when receiving a safety lock signal indicating triggering of a safety lock, and the signal control module outputs a second level signal when receiving the first level signal. The pre-driving module outputs a driving signal for short-circuit braking of the motor under the condition that the upper tube control end receives the second level signal and the lower tube control end receives the first level signal, short-circuit braking of the motor is achieved, safety lock braking is achieved without a large-size relay, and the occupied equipment size is effectively reduced.

Description

Technical Field

[0001] Embodiments of the present application relate to a safety lock circuit, and in particular, to a safety lock circuit, a motor drive module, and a fitness device. Background Art

[0002] In fitness devices such as treadmills, in order to ensure the safety of users during use, a safety lock device is connected to the fitness device. It is required that the safety lock device does not work when the fitness device is working properly, and when an accident occurs during the user's use, the safety lock device is activated and the fitness device stops running.

[0003] In existing fitness devices, the fitness device drive board is provided with a safety lock interface. A safety lock device is externally connected through the safety lock interface. The safety lock device gives a safety lock signal to the control board, and the safety lock signal directly controls the motor power supply of the treadmill device. Among them, the motor power supply is controlled by a relay switch, that is, the safety lock signal controls the relay switch. However, since the safety lock control needs to be implemented by a relay main control module and a working power supply also needs to be provided for the relay, the relay and its related circuits will occupy more device space and increase the device cost. Summary of the Utility Model

[0004] Embodiments of the present application provide a safety lock circuit, a motor drive module, and a fitness device to solve the technical problem that the relays and their related circuits required for safety lock control in related technologies will occupy more device space and increase the device cost, and effectively reduce the occupation of device space by safety lock control and reduce the device cost.

[0005] In a first aspect, embodiments of the present application provide a safety lock circuit, including a safety signal interface module and a signal control module, where:

[0006] The output end of the safety signal interface module is connected to the control end of the signal control module. The output end of the safety signal interface module is used to connect the lower tube control end of the pre-drive module. The safety signal interface module is used to connect a safety lock device and receive a safety lock signal provided by the safety lock device;

[0007] The output end of the signal control module is used to connect the upper tube control end of the pre-drive module. When the safety signal interface module receives a safety lock signal indicating that the safety lock is triggered, it outputs a first level signal. When the signal control module receives the first level signal, it outputs a second level signal through the output end. Wherein, when the pre-drive module receives the second level signal at the upper tube control end and the first level signal at the lower tube control end, it outputs a drive signal for short-circuit braking the motor.

[0008] In the embodiment of the present application, a safety signal interface module is connected to a safety lock device. The output end of the safety signal interface module is connected to the lower tube control end of the pre-driver module, and the output end of the signal control module is connected to the upper tube control end of the pre-driver module. When the safety signal interface module receives a safety lock signal indicating that the safety lock is triggered, it outputs a first level signal, and when the signal control module receives the first level signal, it outputs a second level signal. In this way, when the upper tube control end of the pre-driver module receives the second level signal and the lower tube control end receives the first level signal, the pre-driver module outputs a drive signal for short-circuit braking of the motor, realizing the short-circuit braking of the motor. There is no need to use a large-volume relay to achieve safety lock braking, effectively reducing the occupation of the device volume.

[0009] Further, the signal control module includes a switch unit. The number of the switch units corresponds to the number of ports of the upper tube control end of the pre-driver module. The control end of the switch unit is connected to the output end of the safety signal interface module. The first connection end of the switch unit is connected to the corresponding port of the upper tube control end of the pre-driver module, and the second connection end of the switch unit is grounded. When the switch unit receives the first level signal, the first connection end and the second connection end are turned on to output the second level signal through the second connection end.

[0010] As described above, the control of the upper tube control end is realized through the switch unit, accurately realizing the response of the safety lock signal indicating that the safety lock is triggered at the upper tube control end, ensuring the correct response to the safety lock signal and the normal control of the pre-driver module under normal working conditions.

[0011] Further, the switch unit includes a triode and / or a MOS tube.

[0012] As described above, the switch unit is composed of a triode and / or a MOS tube, accurately responding to the output of the safety signal interface module and accurately responding to the safety lock signal.

[0013] Further, it further includes a signal anti-reverse module. The output end of the safety signal interface module is connected to the lower tube control end of the pre-driver module through the signal anti-reverse module.

[0014] As described above, the signal anti-reverse module reduces the interference of the control signal for controlling the pre-driver module on the safety lock signal, reducing the situation that the control signal sent by the main control module to the lower tube control end of the pre-driver module is transmitted to the safety signal interface module and affects the normal operation of the signal control module, ensuring the correct response of the safety lock.

[0015] Further, the signal anti-reverse module includes diodes. The number of the diodes corresponds to the number of ports of the lower transistor control end of the pre-driver module. The anodes of the diodes are connected to the output end of the safety signal interface module, and the cathodes of the diodes are connected to the corresponding ports in the lower transistor control end of the pre-driver module.

[0016] As described above, the signal anti-reverse module composed of diodes effectively prevents the control signal of the main control module from being transmitted to the safety signal interface module, which may cause the safety lock function to be wrongly triggered. Moreover, the signal anti-reverse is achieved by using diodes with a relatively small volume, effectively reducing the occupation of the device volume.

[0017] Further, it further includes a sink current limiting module. The first connection end of the sink current limiting module is used to connect to the control output end of the main control module, and the second connection end of the sink current limiting module is connected to the output end of the safety signal interface module and the output end of the signal control module.

[0018] As described above, the influence of the safety lock-related signals on the main control module is effectively reduced by the sink current limiting module, ensuring the correct response of the safety lock.

[0019] Further, the sink current limiting module includes a first resistor. The number of the first resistors corresponds to the number of ports of the upper transistor control end and the lower transistor control end of the pre-driver module. The first connection end of the first resistor is used to connect to the control output end of the main control module, and the second connection end of the first resistor is connected to the corresponding port in the upper transistor control end or the lower transistor control end of the pre-driver module.

[0020] As described above, the sink current limiting function is achieved by the first resistor, reducing the influence of the safety lock signal on the normal operation of the main control module. Moreover, the sink current limiting is achieved by using the first resistor with a relatively small volume, effectively reducing the occupation of the device volume.

[0021] Further, it further includes a signal filtering module. The signal input end of the signal filtering module is connected to the output end of the safety signal interface module, and the signal output end of the signal filtering module is connected to the lower transistor control end of the pre-driver module.

[0022] As described above, the safety lock signal is filtered by the signal filtering module to reduce signal interference and ensure the correct response of the safety lock.

[0023] In a second aspect, an embodiment of the present application provides a motor drive module, including a main control module, a pre-driver module, a drive module, and a safety lock circuit according to any one of the first aspect. The control output end of the main control module is connected to the upper transistor control end and the lower transistor control end of the pre-driver module. The pre-driver output end of the pre-driver module is connected to the control input end of the drive module, and the control output end of the drive module is used to connect to a motor.

[0024] In the embodiment of the present application, a safety signal interface module is connected to a safety lock device. The output end of the safety signal interface module is connected to the lower tube control end of the pre-driver module, and the output end of the signal control module is connected to the upper tube control end of the pre-driver module. When the safety signal interface module receives a safety lock signal indicating that the safety lock is triggered, it outputs a first level signal, and when the signal control module receives the first level signal, it outputs a second level signal. Such that when the pre-driver module receives the second level signal at the upper tube control end and the first level signal at the lower tube control end, it outputs a drive signal for short-circuit braking the motor, realizing the short-circuit braking of the motor, without the need to use a large-volume relay to achieve safety lock braking. While ensuring correct driving and braking of the motor, it effectively reduces the occupation of the device volume.

[0025] In a third aspect, the embodiment of the present application provides a fitness device, including a motor and the motor drive module as described in the second aspect, and the control output end of the drive module in the motor drive module is connected to the motor.

[0026] In the embodiment of the present application, a safety signal interface module is connected to a safety lock device. The output end of the safety signal interface module is connected to the lower tube control end of the pre-driver module, and the output end of the signal control module is connected to the upper tube control end of the pre-driver module. When the safety signal interface module receives a safety lock signal indicating that the safety lock is triggered, it outputs a first level signal, and when the signal control module receives the first level signal, it outputs a second level signal. Such that when the pre-driver module receives the second level signal at the upper tube control end and the first level signal at the lower tube control end, it outputs a drive signal for short-circuit braking the motor, realizing the short-circuit braking of the motor, without the need to use a large-volume relay to achieve safety lock braking. While ensuring correct driving and braking of the motor, it effectively reduces the occupation of the fitness device volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a circuit schematic diagram of a fitness device in the related art;

[0028] Figure 2 is a schematic diagram of the principle of a safety lock circuit provided by an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of the principle of another safety lock circuit provided by an embodiment of the present application;

[0030] Figure 4 is a schematic diagram of the principle of another safety lock circuit provided by an embodiment of the present application;

[0031] Figure 5 is a circuit schematic diagram of a motor drive module provided by an embodiment of the present application;

[0032] Figure 6 It is a circuit schematic diagram of a fitness device provided by an embodiment of the present application.

[0033] Reference numerals: 1, safety signal interface module; 2, signal control module; 21, switch unit; 3, signal anti-reverse module; 31, diode; 4, sink current limiting module; 41, first resistor; 5, signal filtering module; 51, second resistor; 52, filtering capacitor; 6, pre-driver module; 7, driver module; 8, motor. Detailed implementation manners

[0034] In order to make the objectives, technical solutions, and advantages of the present application clearer, the following further describes the specific embodiments of the present application in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limiting the present application. Additionally, it should be noted that for the convenience of description, only parts related to the present application are shown in the drawings, rather than all the content.

[0035] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connected", "coupled", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0036] Figure 1 It is a circuit schematic diagram of a fitness device in the related art. For example Figure 1 , the fitness device includes a power supply circuit, a main control module (MCU), a pre-driver module, a driver module, a safety lock interface, a relay module, and a motor.

[0037] Among them, the driver module is connected to the motor. The motor is a three-phase motor, and the driver module is a three-phase bridge inverter drive module. By controlling the alternating conduction and cut-off of the power transistors (IGBTs) in the three-phase bridge inverter drive module, the inversion of direct current and the control of the operation of the motor can be achieved. The power supply circuit, as the power supply line of the motor, is connected to the power input terminal of the driver module. The control output terminal of the main control module is connected to the control terminal of the pre-driver module (the 6 control output terminals of the main control module are respectively connected to the 3 lower transistor control terminals and the 3 upper transistor control terminals of the pre-driver module). The pre-driver output terminal of the pre-driver module is connected to the control input terminal of the driver module.

[0038] The safety lock interface is used to connect to the input end of the safety lock device. When the safety lock device is in the untriggered state (i.e., when the user uses the fitness device without any abnormality or accident), it sends a first level signal (such as a high level signal) to the safety lock interface. When the safety lock device is in the triggered state (i.e., when the user uses the fitness device with an abnormality or accident), the safety lock device sends a second level signal (such as a low level signal) to the safety lock interface. The output end of the safety lock interface is connected to the control end of the relay module, and the output end of the relay module is connected to the power supply circuit to control the on / off of the power supply circuit. Among them, the relay module includes a relay unit and a relay power supply for powering the relay unit. The coil part of the relay unit can be used as the control end of the relay module and is connected to the output end of the safety lock interface. The contact part (such as a normally open contact) of the relay unit can be used as the output end of the relay module and is connected in series to the power supply circuit. Among them, when the fitness device is operating normally, the safety lock device is connected to the safety lock interface and sends a second level signal to the relay module. The relay module controls the power supply circuit to be turned on and supplies power to the motor normally. When an abnormality occurs during the user's use of the fitness device and the safety lock function needs to be triggered, the safety lock device disconnects from the safety lock interface, so that the relay module receives the first level signal. The relay module disconnects the power supply circuit and cuts off the power supply to the motor, causing the motor to power off and stop, ensuring the safety of the user and the device.

[0039] Although the relay module can stop supplying power to the motor when the safety lock is triggered, a relay power supply still needs to be provided for the relay. The relay and the relay power supply will occupy a relatively large amount of device space, increasing the device cost. Based on this, a safety lock circuit according to an embodiment of the present application is provided to solve the technical problem that the existing safety lock control requires a relay and its related circuits, which will occupy a relatively large amount of device space and increase the device cost.

[0040] Figure 2 A schematic diagram of the principle of a safety lock circuit provided by an embodiment of the present application is given. The safety lock circuit includes a safety signal interface module 1 and a signal control module 2. Among them, the output end of the safety signal interface module 1 provided in this solution is connected to the control end of the signal control module 2. The output end of the safety signal interface module 1 is used to connect to the lower tube control end of the pre-driver module 6. The safety signal interface module 1 is used to connect to the safety lock device and receive the safety lock signal provided by the safety lock device. The output end of the signal control module 2 is used to connect to the upper tube control end of the pre-driver module 6. In one embodiment, the first level signal and the second level signal provided in this solution are inverted level signals. For example, the first level signal and the second level signal are a high level signal and a low level signal respectively.

[0041] Among them, when the safety lock device is connected to the safety signal interface module 1, it sends a safety lock signal indicating that the safety lock is not triggered to the safety signal interface module 1 (for example, the safety lock device outputs a second-level signal as the safety lock signal indicating that the safety lock is not triggered, and the second-level signal can be output by means such as pin floating or inverting the first-level signal). When an abnormality occurs in the safety lock device (for example, the connecting rope on the safety lock device is detached or the safety lock device is pulled under an external force), the safety signal interface module 1 sends a safety lock signal indicating that the safety lock is triggered to the safety signal interface module 1 (for example, the safety lock device outputs a first-level signal as the safety lock signal indicating that the safety lock is not triggered, and the safety lock device can directly output the first-level signal, or can also output the first-level signal by inverting the second-level signal).

[0042] When the safety signal interface module 1 provided in this solution receives the safety lock signal indicating that the safety lock is not triggered, it outputs a second-level signal. When the signal control module 2 receives the second-level signal, it does not interfere with the potential of the upper transistor control terminal of the pre-drive module 6, and the signal received by the upper transistor control terminal of the pre-drive module 6 is the same as the control signal output by the corresponding port of the connected main control module. At the same time, when the safety signal interface module 1 outputs the second-level signal, it does not interfere with the potential of the lower transistor control terminal of the pre-drive module 6, and the signal received by the lower transistor control terminal of the pre-drive module 6 is the same as the control signal output by the corresponding port of the connected main control module. When the safety signal interface module 1 outputs the second-level signal, the pre-drive module 6 can send a drive signal (such as a PWM signal) for driving the motor to work to the connected drive module 7 according to the control signals output by the connected main control module to the upper transistor control terminal and the lower transistor control terminal.

[0043] When the safety signal interface module 1 provided in this solution receives the safety lock signal indicating that the safety lock is triggered, it outputs a first-level signal. When the signal control module 2 receives the first-level signal, it outputs a second-level signal through the output terminal. Among them, when the pre-drive module 6 receives a second-level signal at the upper transistor control terminal and a first-level signal at the lower transistor control terminal, the output drive signal is a drive signal for short-circuit braking the motor, so that the motor is short-circuited (for example, the three phases UVW of the three-phase motor are short-circuited) to brake, realizing the rapid shutdown of the motor. And through the short-circuit braking method, a closed-loop circuit can be formed for the motor. This closed-loop circuit can increase the induced current of the motor, making the braking torque of the motor larger, enabling the motor to brake and stop running more quickly. And the braking energy is proportional to the running speed of the motor. Compared with the existing solution of controlling the safety lock to cut off the power supply of the relay, a better braking effect can be achieved.

[0044] As described above, the safety lock device is connected through the safety signal interface module 1. The output end of the safety signal interface module 1 is connected to the lower transistor control end of the pre-driver module 6, and the output end of the signal control module 2 is connected to the upper transistor control end of the pre-driver module 6. When the safety signal interface module 1 receives a safety lock signal indicating that the safety lock is triggered, it outputs a first level signal. And when the signal control module 2 receives the first level signal, it outputs a second level signal, so that when the pre-driver module 6 receives the second level signal at the upper transistor control end and the first level signal at the lower transistor control end, it outputs a drive signal for short-circuit braking of the motor, realizing short-circuit braking of the motor, and there is no need to use a large-volume relay to achieve safety lock braking, effectively reducing the occupation of the equipment volume.

[0045] Based on the above embodiment, Figure 3 a schematic diagram of the principle of another safety lock circuit provided by the embodiment of the present application is given. This safety lock circuit can be further set on the basis of the above safety lock circuit. Refer to Figure 3 , this safety lock circuit includes a safety signal interface module 1 and a signal control module 2. The output end of the safety signal interface module 1 is connected to the control end of the signal control module 2. The output end of the safety signal interface module 1 is used to connect to the lower transistor control end of the pre-driver module 6. The safety signal interface module 1 is used to connect to the safety lock device and receive the safety lock signal provided by the safety lock device. The output end of the signal control module 2 is used to connect to the upper transistor control end of the pre-driver module 6.

[0046] In one embodiment, the safety lock circuit provided by this solution further includes a signal anti-reverse module 3. The output end of the safety signal interface module 1 is connected to the lower transistor control end of the pre-driver module 6 through the signal anti-reverse module 3. For example, the first connection end of the signal anti-reverse module 3 is connected to the output end of the safety signal interface module 1, and the second connection end of the signal anti-reverse module 3 is connected to the lower transistor control end of the pre-driver module 6. The signal anti-reverse module 3 provided by this solution can be used to realize the one-way transmission of signals from the safety signal interface module 1 to the lower transistor control end of the pre-driver module 6. By using the signal anti-reverse module 3, the interference of the control signal for controlling the pre-driver module 6 (the control signal sent by the main control module to the lower transistor control end of the pre-driver module 6) on the safety lock signal is reduced, and the situation that the control signal sent by the main control module to the lower transistor control end of the pre-driver module 6 is transmitted to the safety signal interface module 1 and affects the normal operation of the signal control module 2 is reduced, ensuring the correct response of the safety lock.

[0047] In one embodiment, the safety lock circuit provided by the present solution further includes a sink current limiting module 4. The sink current limiting module 4 is configured with a first connection end and a second connection end. Among them, the first connection end of the sink current limiting module 4 is used to connect to the control output end of the main control module, and the second connection end of the sink current limiting module 4 is connected to the output end of the safety signal interface module 1 and the output end of the signal control module 2. The sink current limiting module 4 can be used to reduce the sink current transmitted by the safety signal interface module 1 and the signal control module 2 to the main control module. Among them, the main control module is used to send corresponding control signals to the pre-driver module 6 according to the control requirements of the motor. The present solution effectively reduces the influence of safety lock-related signals on the main control module through the sink current limiting module 4, ensuring the correct response of the safety lock.

[0048] In one embodiment, the safety lock circuit provided by the present solution further includes a signal filtering module 5. The signal input end of the signal filtering module 5 is connected to the output end of the safety signal interface module 1, and the signal output end of the signal filtering module 5 is connected to the lower transistor control end of the pre-driver module 6. The present solution filters the safety lock signal through the signal filtering module 5 to reduce signal interference and ensure the correct response of the safety lock.

[0049] Exemplarily, when the switch lock device is connected to the safety signal interface module 1 and the device is working properly, the switch lock device outputs a safety lock signal indicating that the safety lock is not triggered to the safety signal interface module 1. The safety signal interface module 1 sends a second level signal to the signal control module 2. The signal control module 2 does not send a second level signal to the upper transistor control end of the pre-driver module 6. The signal received by the corresponding port of the upper transistor control end of the pre-driver module 6 is consistent with the control signal output by the corresponding port of the connected main control module, and the signal received by the lower transistor control end of the pre-driver module 6 is consistent with the control signal output by the corresponding port of the connected main control module. The main control module can normally send a control signal to the pre-driver module 6, and send a drive signal for driving the motor to work to the drive module 7 through the pre-driver module 6. At this time, the power supply circuit can normally supply power to the motor.

[0050] When the user triggers the switch lock device, the switch lock device outputs a safety lock signal indicating that the safety lock is triggered to the safety signal interface module 1. The safety signal interface module 1 sends a first level signal to the signal control module 2 and the lower transistor control end of the pre-driver module 6. The signal control module 2 sends a second level signal to the upper transistor control end of the pre-driver module 6. At this time, the pre-driver module 6 outputs a drive signal for short-circuit braking the motor to the drive module 7, realizing the short-circuit braking of the motor.

[0051] As described above, the safety lock device is connected through the safety signal interface module 1. The output end of the safety signal interface module 1 is connected to the lower transistor control end of the pre-driver module 6, and the output end of the signal control module 2 is connected to the upper transistor control end of the pre-driver module 6. When the safety signal interface module 1 receives a safety lock signal indicating the triggering of the safety lock, it outputs a first level signal. And when the signal control module 2 receives the first level signal, it outputs a second level signal, so that when the pre-driver module 6 receives the second level signal at the upper transistor control end and the first level signal at the lower transistor control end, it outputs a drive signal for short-circuit braking of the motor, realizing the short-circuit braking of the motor. There is no need to use a large-volume relay to achieve safety lock braking, effectively reducing the occupation of the device volume. At the same time, the signal anti-reverse module 3 reduces the interference of the control signal for controlling the pre-driver module 6 on the safety lock signal, and the current sinking limit module 4 effectively reduces the influence of the safety lock-related signal on the main control module, and the signal filtering module 5 filters the safety lock signal to reduce signal interference, ensuring the correct response of the safety lock.

[0052] Based on the above embodiment, Figure 4 Figure 5 shows a schematic diagram of the principle of another safety lock circuit provided by the embodiment of the present application. This safety lock circuit can be further set on the basis of the above safety lock circuit. Refer to Figure 4 Figure 5, this safety lock circuit includes a safety signal interface module 1, a signal control module 2, a signal anti-reverse module 3, a current sinking limit module 4, and a signal filtering module 5. Among them, the output end of the safety signal interface module 1 is connected to the control end of the signal control module 2. The output end of the safety signal interface module 1 is used to connect to the lower transistor control end of the pre-driver module 6. The safety signal interface module 1 is used to connect to the safety lock device and receive the safety lock signal provided by the safety lock device. The output end of the signal control module 2 is used to connect to the upper transistor control end of the pre-driver module 6.

[0053] In one embodiment, the signal control module 2 provided in this solution includes a switch unit 21. The number of switch units 21 corresponds to the number of ports of the upper transistor control end of the pre-driver module 6. The motor provided in this solution is a three-phase motor. The number of ports of the upper transistor control end and the lower transistor control end of the pre-driver module 6 are both 3. Correspondingly, the number of switch units 21 provided in this solution is 3. The switch unit 21 provided in this solution can be a device with a switch conversion function, and the on / off of the first connection end and the second connection end can be controlled through the control end of the switch unit 21. In the figure, PWM UH, PWM VH, and PWM WH correspond to the 3 ports of the upper transistor control end of the pre-driver module 6, and PWM UL, PWM VL, and PWM WL correspond to the 3 ports of the lower transistor control end of the pre-driver module 6.

[0054] The control terminal of the switch unit 21 provided in this solution is connected to the output terminal of the safety signal interface module 1. The first connection terminal of the switch unit 21 is connected to the corresponding port among the upper transistor control terminals of the pre-driver module 6, and the second connection terminal of the switch unit 21 is grounded. Among them, when the control terminal of the switch unit 21 receives the first level signal, the first connection terminal and the second connection terminal are turned on, and the switch unit 21 can output the second level signal through the second connection terminal. For example, by turning on the first connection terminal and the second connection terminal, the corresponding port of the upper transistor control terminal of the connected pre-driver module 6 is grounded, so that the corresponding port of the upper transistor control terminal of the pre-driver module 6 receives the second level signal of low level. When the control terminal of the switch unit 21 receives the second level signal, the first connection terminal and the second connection terminal are turned off, and the signal received by the corresponding port of the upper transistor control terminal of the pre-driver module 6 connected to the switch unit 21 is consistent with the control signal output by the corresponding port of the connected main control module. This solution realizes the control of the upper transistor control terminal through the switch unit 21, accurately realizes the response of the safety lock signal indicating the triggering of the safety lock at the upper transistor control terminal, and ensures the correct response to the safety lock signal and the normal control of the pre-driver module 6 under normal working conditions.

[0055] In one embodiment, the switch unit 21 provided in this solution includes a triode and / or a MOS transistor. Among them, the triode can be an NPN-type triode and / or a PNP-type triode, and the MOS transistor can be an NMOS transistor and / or a PMOS transistor. In the figure, the case where the switch unit 21 is composed of NPN-type triodes is described as an example. Among them, the base, collector, and emitter of the triode are respectively used as the control terminal, the first connection terminal, and the second connection terminal of the switch unit 21. The base of the triode is connected to the output terminal of the safety signal interface module 1 through a resistor, and the base of the triode is connected to the emitter through a resistor. When using NMOS transistors to form the switch unit 21, the gate, source, and drain of the NMOS transistor are respectively used as the control terminal, the first connection terminal, and the second connection terminal of the switch unit 21. When using PNP-type triodes or PMOS transistors to form the switch unit 21, an inverter circuit (inverter) can be connected before the base of the PNP-type triode or before the gate of the PMOS transistor and then connected to the output terminal of the safety signal interface module 1. This solution forms the switch unit 21 through a triode and / or a MOS transistor, accurately responds to the output of the safety signal interface module 1, and accurately responds to the safety lock signal.

[0056] In one embodiment, the signal anti-reverse module 3 provided in this solution includes diodes 31, and the number of diodes 31 corresponds to the number of ports of the lower transistor control terminal of the pre-driver module 6. The motor provided in this solution is a three-phase motor. The number of ports of the upper transistor control terminal and the lower transistor control terminal of the pre-driver module 6 are both 3. Correspondingly, the number of diodes 31 provided in this solution is 3.

[0057] Among them, the anode of each diode 31 is connected to the output terminal of the safety signal interface module 1, and the cathode of the diode 31 is connected to the corresponding port in the lower transistor control terminal of the pre-driver module 6, that is, the cathode of each diode 31 is respectively connected to a port of the lower transistor control terminal of the pre-driver module 6. Among them, when the safety signal interface module 1 outputs a first-level signal, the first-level signal can normally pass through the diode 31 and be transmitted to the lower transistor control terminal of the pre-driver module 6. When the main control module sends a control signal to the lower transistor control terminal of the pre-driver module 6, the control signal will be blocked by the diode 31, effectively preventing the control signal of the main control module from being transmitted to the safety signal interface module 1, resulting in the situation of erroneously triggering the safety lock function, and realizing signal anti-reversal through the relatively small-sized diode 31, effectively reducing the occupation of the device volume.

[0058] In one embodiment, the provided sink current limiting module 4 includes a first resistor 41, and the number of the first resistors 41 corresponds to the number of ports of the upper transistor control terminal and the lower transistor control terminal of the pre-driver module 6. The provided motor is a three-phase motor, and the number of ports of both the upper transistor control terminal and the lower transistor control terminal of the pre-driver module 6 is 3. Correspondingly, the number of the provided first resistors 41 is 6.

[0059] Among them, the first connection terminal of the first resistor 41 is used to connect to the control output terminal of the main control module, and the second connection terminal of the first resistor 41 is connected to the corresponding port in the upper transistor control terminal or the lower transistor control terminal of the pre-driver module 6. That is, the first connection terminal of each first resistor 41 corresponding to the upper transistor control terminal is respectively connected to a port of the control output terminal of the main control module, and the second connection terminal is connected to the first connection terminal of a switching unit 21 (in the figure, the second connection terminals of the first resistors 41 corresponding to the upper transistor control terminal are respectively connected to the collector of a triode), and the first connection terminal of each first resistor 41 corresponding to the lower transistor control terminal is respectively connected to a port of the control output terminal of the main control module, and the second connection terminal is connected to the second connection terminal of a signal anti-reversal module 3 (in the figure, the second connection terminals of the first resistors 41 corresponding to the upper transistor control terminal are respectively connected to the cathode of a diode 31). This solution realizes the sink current limiting function through the first resistor 41, reduces the influence of the safety lock signal on the normal operation of the main control module, and realizes the sink current limiting through the relatively small-sized first resistor 41, effectively reducing the occupation of the device volume.

[0060] In one embodiment, the signal filtering module 5 provided by this solution includes a second resistor 51 and a filtering capacitor 52. The first connection end of the second resistor 51 is connected to the output end of the safety signal interface module 1, and the second connection end of the second resistor 51 is connected to the first connection end of the signal anti-reverse module 3 (in the figure, the second connection end of the second resistor 51 is connected to the anode of the diode 31). The first connection end of the filtering capacitor 52 is connected to the first connection end of the signal anti-reverse module 3 (in the figure, the first connection end of the filtering capacitor 52 is connected to the anode of the diode 31), and the second connection end of the filtering capacitor 52 is grounded. This solution filters the safety lock signal through the second resistor 51 and the filtering capacitor 52, reduces signal interference, ensures the correct response of the safety lock, and realizes signal filtering through the relatively small-sized second resistor 51 and filtering capacitor 52, effectively reducing the occupation of the device volume.

[0061] Among them, the power input end of the drive module can be connected to a power supply circuit. The power supply circuit can be connected to an external power supply (such as a 220V, 50Hz mains power supply), and converts the external mains power supply into direct current suitable for the motor to work through a rectifier filter circuit. The power supply circuit can be connected to the external power supply through a fuse to ensure the safety of the device.

[0062] Exemplarily, when the switch lock device is connected to the safety signal interface module 1 and the device is working normally, the switch lock device outputs a safety lock signal (low-level signal) indicating that the safety lock is not triggered to the safety signal interface module 1. The safety signal interface module 1 sends a second-level signal to the base of the triode, the triode is turned off, the signal received by the corresponding port of the upper tube control end of the pre-drive module 6 is consistent with the control signal output by the corresponding port of the connected main control module, and the signal received by the lower tube control end of the pre-drive module 6 is consistent with the control signal output by the corresponding port of the connected main control module. The main control module can normally send a control signal to the pre-drive module 6, and send a drive signal for driving the motor to work to the drive module through the pre-drive module 6. At this time, the power supply circuit can normally supply power to the motor.

[0063] When the user triggers the switch lock device, the switch lock device outputs a safety lock signal (high-level signal) indicating that the safety lock is triggered to the safety signal interface module 1. The safety signal interface module 1 sends a first-level signal to the base of the triode and to the upper tube control end of the pre-drive module 6 through the diode 31. The triode conducts and pulls down the potential of the upper tube control end of the pre-drive module 6 (that is, the triode sends a second-level signal to the upper tube control end of the pre-drive module 6). At this time, the pre-drive module 6 outputs a drive signal for short-circuit braking the motor to the drive module, realizing the short-circuit braking of the motor.

[0064] As described above, the safety lock device is connected through the safety signal interface module 1. The output end of the safety signal interface module 1 is connected to the lower transistor control end of the pre-driver module 6, and the output end of the signal control module 2 is connected to the upper transistor control end of the pre-driver module 6. When the safety signal interface module 1 receives a safety lock signal indicating that the safety lock is triggered, it outputs a first level signal. And when the signal control module 2 receives the first level signal, it outputs a second level signal, so that when the pre-driver module 6 receives the second level signal at the upper transistor control end and the first level signal at the lower transistor control end, it outputs a drive signal for short-circuit braking of the motor, realizing the short-circuit braking of the motor. There is no need to use a large-volume relay to achieve safety lock braking, effectively reducing the occupation of the device volume. At the same time, the control of the upper transistor control end is realized through the switch unit 21, accurately realizing the response of the safety lock signal indicating that the safety lock is triggered at the upper transistor control end, ensuring the correct response to the safety lock signal and the normal control of the pre-driver module 6 under normal working conditions. The switch unit 21 is composed of a triode and / or a MOS transistor, accurately responding to the output of the safety signal interface module 1 and accurately responding to the safety lock signal. The signal anti-reverse is realized through a diode 31 with a small volume, and the sink current limit is realized through a first resistor 41 with a small volume, effectively reducing the occupation of the device volume.

[0065] Figure 5 The circuit schematic diagram of a motor drive module provided by an embodiment of the present application is given, as shown in Figure 5 As shown, the motor drive module provided by this solution includes a main control module, a pre-driver module 6, a drive module 7, and a safety lock circuit provided in any of the above embodiments.

[0066] Among them, the control output end of the main control module is connected to the upper transistor control end and the lower transistor control end of the pre-driver module 6. The pre-driver output end of the pre-driver module 6 is connected to the control input end of the drive module 7. The control output end of the drive module 7 is used to connect to the motor. For the safety lock circuit provided by this solution, as well as the connection of the main control module, the pre-driver module 6, the drive module 7, and the safety lock circuit, reference can be made to the above embodiments, and details are not described in this solution.

[0067] As described above, the safety lock device is connected through the safety signal interface module 1. The output end of the safety signal interface module 1 is connected to the lower transistor control end of the pre-driver module 6, and the output end of the signal control module 2 is connected to the upper transistor control end of the pre-driver module 6. When the safety signal interface module 1 receives a safety lock signal indicating that the safety lock is triggered, it outputs a first-level signal. And when the signal control module 2 receives the first-level signal, it outputs a second-level signal, so that when the pre-driver module 6 receives the second-level signal at the upper transistor control end and the first-level signal at the lower transistor control end, it outputs a drive signal for short-circuit braking of the motor, realizing the short-circuit braking of the motor. There is no need to use a large-sized relay to achieve safety lock braking. While ensuring correct driving and braking of the motor, it effectively reduces the occupation of the equipment volume.

[0068] Figure 6 The circuit schematic diagram of a fitness device provided by an embodiment of the present application is given, as shown in Figure 6 As shown, the fitness device provided by this solution includes a motor 8 and the motor drive module provided in the above embodiment. The control output end of the drive module 7 in the motor drive module is connected to the motor 8. The motor drive module provided by this solution and the safety lock circuit in the motor drive module can refer to the above embodiment, and will not be elaborated here.

[0069] As described above, the safety lock device is connected through the safety signal interface module 1. The output end of the safety signal interface module 1 is connected to the lower transistor control end of the pre-driver module 6, and the output end of the signal control module 2 is connected to the upper transistor control end of the pre-driver module 6. When the safety signal interface module 1 receives a safety lock signal indicating that the safety lock is triggered, it outputs a first-level signal. And when the signal control module 2 receives the first-level signal, it outputs a second-level signal, so that when the pre-driver module 6 receives the second-level signal at the upper transistor control end and the first-level signal at the lower transistor control end, it outputs a drive signal for short-circuit braking of the motor 8, realizing the short-circuit braking of the motor 8. There is no need to use a large-sized relay to achieve safety lock braking. While ensuring correct driving and braking of the motor 8, it effectively reduces the occupation of the fitness device volume.

[0070] The above is only the preferred embodiment of the present application and the technical principles applied. The present application is not limited to the specific embodiments provided here. Various obvious changes, re-adjustments and substitutions that can be made by those skilled in the art will not depart from the protection scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments. Without departing from the concept of the present application, it can also include more other equivalent embodiments, and the scope of the present application is determined by the scope of the claims.

Claims

1. A safety lock circuit, characterized in that: It includes a safety signal interface module and a signal control module, wherein: The output end of the safety signal interface module is connected to the control end of the signal control module, the output end of the safety signal interface module is used to connect to the lower tube control end of the pre-drive module, and the safety signal interface module is used to connect to the safety lock device and receive the safety lock signal provided by the safety lock device; The output end of the signal control module is used to connect to the upper tube control end of the pre-drive module. When the safety signal interface module receives a safety lock signal indicating that the safety lock is triggered, the first level signal is output. When the signal control module receives the first level signal, the second level signal is output through the output end. When the upper tube control end of the pre-drive module receives the second level signal and the lower tube control end receives the first level signal, the pre-drive module outputs a drive signal for short-circuiting the motor for braking.

2. The safety lock circuit according to claim 1, characterized in that: The signal control module includes a switch unit, the number of which corresponds to the number of ports of the upper tube control end of the pre-drive module, the control end of the switch unit is connected to the output end of the safety signal interface module, the first connection end of the switch unit is connected to the corresponding port in the upper tube control end of the pre-drive module, the second connection end of the switch unit is grounded, and when the switch unit receives a first level signal, the first connection end is connected to the second connection end to output a second level signal through the second connection end.

3. The safety lock circuit according to claim 2, characterized in that: The switch unit includes a triode and / or a MOS tube.

4. The safety lock circuit according to claim 1, characterized in that: It also includes a signal anti-reverse module, and the output end of the safety signal interface module is connected to the lower tube control end of the pre-drive module through the signal anti-reverse module.

5. The safety lock circuit according to claim 4, characterized in that: The signal anti-reverse module includes a diode, the number of which corresponds to the number of ports of the lower tube control end of the pre-drive module, the anode of the diode is connected to the output end of the safety signal interface module, and the cathode of the diode is connected to the corresponding port in the lower tube control end of the pre-drive module.

6. The safety lock circuit according to claim 1, characterized in that: It also includes a current limiting module, a first connection end of the current limiting module is used to connect to the control output end of the main control module, and a second connection end of the current limiting module is connected to the output end of the safety signal interface module and the output end of the signal control module.

7. The safety lock circuit according to claim 6, characterized in that: The current injection limiting module includes a first resistor, the number of which corresponds to the number of ports of the upper tube control end and the lower tube control end of the pre-drive module, the first connection end of the first resistor is used to connect to the control output end of the main control module, and the second connection end of the first resistor is connected to the corresponding port of the upper tube control end or the lower tube control end of the pre-drive module.

8. The safety lock circuit according to claim 1, characterized in that: It also includes a signal filtering module, wherein the signal input end of the signal filtering module is connected to the output end of the safety signal interface module, and the signal output end of the signal filtering module is connected to the lower tube control end of the pre-drive module.

9. A motor drive module, characterized in that: It comprises a main control module, a pre-drive module, a drive module and a safety lock circuit as described in any one of claims 1 to 8, wherein the control output end of the main control module is connected to the upper tube control end and the lower tube control end of the pre-drive module, the pre-drive output end of the pre-drive module is connected to the control input end of the drive module, and the control output end of the drive module is used to connect a motor.

10. A fitness equipment, characterized in that: It comprises a motor and the motor driving module as claimed in claim 9, wherein a control output end of a driving module in the motor driving module is connected to the motor.

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