Detection control circuit, servo motor driver, servo motor and detection method

Abstract

The present invention discloses a detection control circuit, a servo motor driver, a servo motor and a detection method. The detection control circuit comprises: a main control module and a voltage follower module, wherein the main control module is connected to the voltage follower module; the main control module is used to send a detection signal and receive a feedback signal; when the braking resistor is working normally, the voltage follower module outputs a feedback signal with the same period as the detection signal; when the braking resistor is not working normally, the voltage follower module outputs a constant level signal of a preset amplitude. The present invention determines whether the braking resistor is working normally by detecting the feedback signal through the main control module, thereby improving the safety of the system, and can adjust the duty cycle of the detection signal through the main control module to adjust the power used by the braking resistor.

Description

Technical Field

[0001] The present invention relates to the field of electronic circuits, and in particular to a detection control circuit, a servo motor driver, a servo motor and a detection method. Background Art

[0002] As a kind of upper controller of the motor, the servo motor driver needs to use the method of connecting a braking resistor to convert the regenerative electric energy generated by the motor due to the rapid stop into heat energy when controlling the motor to stop quickly (also called braking), so as to avoid the interference of the regenerative electric energy on the power supply network voltage, achieve the effect of protecting the smooth operation of the power supply network, and effectively reduce the braking time. However, the braking resistor is easy to burn out during use, so a detection device is needed to detect whether the braking resistor is working properly. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a detection control circuit capable of detecting whether a brake resistor is working normally.

[0004] The invention also provides a servo motor driver.

[0005] The invention also provides a servo motor.

[0006] The invention also provides a detection method.

[0007] In a first aspect, an embodiment of the present invention provides a detection control circuit, comprising: a main control module, an input panel control module and a voltage follower module, wherein the main control module is connected to the voltage follower module; an input end of the input panel control module is connected to an input end of the main control module,

[0008] The main control module is used to send detection signals and receive feedback signals;

[0009] When the braking resistor operates normally, the voltage follower module outputs a feedback signal having the same period as the detection signal;

[0010] When the braking resistor does not work normally, the voltage follower module outputs a constant level signal of a preset amplitude.

[0011] The detection control circuit of the embodiment of the present invention has at least the following beneficial effects: the feedback signal is detected by the main control module to determine whether the braking resistor is working normally, thereby improving the safety of the system, and the duty cycle of the detection signal can be adjusted by the main control module to adjust the power usage of the braking resistor.

[0012] According to some other embodiments of the present invention, the detection control circuit further includes an isolation module, wherein the input end of the isolation module is connected to the output end of the main control module, and the output end of the isolation module is connected to the input end of the voltage follower module.

[0013] Furthermore, it also includes an input panel control module, and the output end of the input panel control module is connected to the input end of the main control module.

[0014] Further, the voltage follower module includes: the voltage follower module includes: a first photocoupler, a first NMOS tube pull-up resistor, an excitation power supply, a first diode and a pull-up power supply, the gate of the first NMOS tube is connected to a detection signal, the source of the first NMOS tube is grounded, the braking resistor is connected between the drain of the first NMOS tube and the excitation power supply, the first pin of the first photocoupler is grounded, the second pin of the first photocoupler is connected to the drain of the first NMOS tube, the third pin of the first photocoupler is connected to the input end of the main control module, the fourth pin of the first photocoupler is grounded, the pull-up resistor is connected between the pull-up power supply and the third pin of the first photocoupler, the anode of the first diode is connected to the drain of the first NMOS tube, and the cathode of the first diode is connected to the excitation power supply.

[0015] Furthermore, the isolation module includes a second photocoupler and a second transistor, the base of the second transistor is connected to the detection signal, the emitter of the second transistor is grounded, the collector of the second transistor is connected to the third pin of the second photocoupler, and the fifth pin of the second photocoupler is connected to the input end of the voltage follower module.

[0016] In a second aspect, an embodiment of the present invention provides a servo motor driver and a servo motor, which include the above-mentioned detection control circuit and have higher system safety.

[0017] In a third aspect, an embodiment of the present invention provides a detection method, comprising: acquiring detection signal setting information;

[0018] Sending the detection signal to a voltage follower module;

[0019] Receive feedback signals to determine whether the braking resistor is working properly.

[0020] The above method can effectively determine whether the braking resistor is working normally, thereby improving the safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a principle block diagram of a detection control circuit in an embodiment of the present invention;

[0022] Figure 2 is a principle block diagram of another detection control circuit in an embodiment of the present invention;

[0023] Figure 3 is a circuit schematic diagram of a detection control circuit in an embodiment of the present invention;

[0024] Figure 4 is a waveform diagram of a detection signal in a circuit schematic diagram of a detection control circuit in an embodiment of the present invention;

[0025] Figure 5 is a waveform diagram of a feedback signal in a circuit schematic diagram of a detection control circuit in an embodiment of the present invention;

[0026] Figure 6 It is a flow chart of a detection control method in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments to clearly and completely describe the concept of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0028] In the description of the present invention, if it involves a description of orientation, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. If a feature is referred to as being "set", "fixed", "connected", or "installed" on another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, connected, or installed on the other feature.

[0029] In the description of the embodiments of the present invention, if "several" is involved, it means more than one, if "multiple" is involved, it means more than two, if "greater than", "less than" or "exceed" is involved, it should be understood as not including the number itself, if "above", "below" or "within" is involved, it should be understood as including the number itself. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] Reference Figure 1, shows a principle block diagram of a detection control circuit in an embodiment of the present invention. It is used to detect whether the brake resistor is working normally, including: a main control module 100, a voltage follower module 200 and an input panel control module 400, the main control module 100 is connected to the voltage follower module 200;

[0031] The main control module 100 is used to send detection signals and receive feedback signals;

[0032] When the braking resistor operates normally, the voltage follower module 200 outputs a feedback signal with the same period as the detection signal;

[0033] When the braking resistor does not work properly, the voltage follower module outputs a constant level signal of a preset amplitude.

[0034] The main control module detects the feedback signal to determine whether the brake resistor is working normally, which improves the safety of the system. The main control module can also adjust the duty cycle of the detection signal and the power used by the brake resistor.

[0035] The output end of the input panel control module 400 is connected to the input end of the main control module. The main control module 100 obtains the enable signal of the brake resistor through the input panel control module 400 and starts to send the detection signal. The main control module 100 receives the adjustment instruction through the input panel control module 400 and adjusts the duty cycle of the detection signal.

[0036] Reference Figure 2 , shows a principle block diagram of another detection control circuit in an embodiment of the present invention; it also includes an isolation module 300, the input end of the isolation module 300 is connected to the output end of the main control module 100, and the output end of the isolation module 300 is connected to the input end of the voltage follower module 200. The isolation module 300 improves the anti-interference ability of the circuit.

[0037] Reference Figure 3, shows a circuit schematic diagram of a detection control circuit in an embodiment of the present invention, the voltage follower module 200 includes: a first photocoupler U1, a first NMOS tube pull-up resistor R1, an excitation power supply VCC, a first diode D1, a second diode D2 and a pull-up power supply VDD, the gate of the first NMOS tube Q1 is connected to the output end of the isolation module 300, the source of the first NMOS tube Q1 is grounded, the braking resistor R is connected between the drain of the first NMOS tube Q1 and the excitation power supply VCC, the first pin of the first photocoupler U1 is grounded, the second pin of the first photocoupler U1 is connected to the drain of the first NMOS tube Q1, the third pin of the first photocoupler U1 is connected to the input end of the main control module, the fourth pin of the first photocoupler U1 is grounded, the pull-up resistor R is connected between the pull-up power supply VDD and the third pin of the first photocoupler U1, the anode of the first diode D1 is connected to the drain of the first NMOS tube Q1, the cathode of the first diode D1 is connected to the excitation power supply VCC, and the first diode D1 is connected in parallel with the second diode D2.

[0038] The isolation module 300 includes a second photocoupler U2 and a second transistor Q2, the base of the second transistor Q2 is connected to the detection signal, the emitter of the second transistor Q2 is grounded, the collector of the second transistor Q2 is connected to the third pin of the second photocoupler U2, and the fifth pin of the second photocoupler U5 is connected to the input end of the voltage follower module 200.

[0039] The detection signal sends a square wave signal with a preset duty cycle, such as Figure 4 As shown, the signal period is 500us, the duty cycle is 30%, and the brake resistor R is in normal working condition. When the detection signal is at a high level, the second transistor Q2 is turned on, the second photocoupler U2 is turned on, and the drain end current of the first NMOS tube Q1 will flow to the power ground through the drain-source path. No current passes through the first photocoupler U1, and the feedback signal is pulled to a high level by the pull-up resistor R1.

[0040] When the detection signal is at a low level, the second transistor Q2 is turned off, the second photocoupler U2 is turned off, the first NMOS transistor Q1 is turned off, the first photocoupler U1 is turned on, and the first photocoupler U1 outputs a low level.

[0041] Therefore, when the brake resistor is working normally, the feedback signal is a signal with the same period as the detection signal, such as Figure 5 shown.

[0042] When the brake resistor R is disconnected, no current flows through the voltage follower module 300 , and the detection signal is pulled up to the pull-up voltage VDD by the pull-up resistor R1 .

[0043] In another embodiment, a control panel is also included, and the control panel is used to receive an enable signal of the braking resistor. After receiving the enable signal, the main control module sends a detection signal to the voltage follower module.

[0044] In addition, the control panel is used to receive the modulation signal, to adjust the period, amplitude or duty cycle of the detection signal, and to adjust the power of the brake resistor. Through the embodiment of the present invention, it is possible to detect whether the brake resistor is working properly and adjust the working power of the brake resistor to achieve a better braking effect.

[0045] The working status of the brake resistor can be effectively detected by detecting the control circuit to ensure the safe use of the circuit.

[0046] The present invention also includes a servo motor driver, comprising the above detection control circuit.

[0047] The present invention also includes a servo motor, comprising the above-mentioned servo motor driver.

[0048] like Figure 6 As shown, the present invention also proposes a detection method, comprising:

[0049] Receive the braking resistor enable command;

[0050] Get the detection signal setting information, get the detection signal amplitude, period, duty cycle and other information,

[0051] Sending the detection signal to a voltage follower module;

[0052] The feedback signal is received to determine whether the braking resistor is working normally. If the feedback signal and the detection signal are signals with the same period and the same waveform change trend, the braking resistor is working normally.

[0053] In another embodiment, if the braking resistor does not work properly, an alarm is issued.

[0054] The above method can effectively determine whether the braking resistor is working normally, thereby improving the safety of the system.

[0055] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A detection control circuit, used to detect whether a braking resistor is working normally, characterized in that: include: A main control module, an input panel control module, a voltage follower module and an isolation module, wherein the main control module is connected to the voltage follower module; the input end of the input panel control module is connected to the input end of the main control module, the input end of the isolation module is connected to the output end of the main control module, and the output end of the isolation module is connected to the input end of the voltage follower module; The main control module is used to send detection signals and receive feedback signals; When the braking resistor operates normally, the voltage follower module outputs a feedback signal having the same period as the detection signal; When the braking resistor does not work properly, the voltage follower module outputs a constant level signal of a preset amplitude; The voltage follower module includes: a first photoelectric coupler, a first NMOS tube pull-up resistor, an excitation power supply, a first diode and a pull-up power supply, the gate of the first NMOS tube is connected to a detection signal, the source of the first NMOS tube is grounded, the braking resistor is connected between the drain of the first NMOS tube and the excitation power supply, the first pin of the first photoelectric coupler is grounded, the second pin of the first photoelectric coupler is connected to the drain of the first NMOS tube, the third pin of the first photoelectric coupler is connected to the input end of the main control module, the fourth pin of the first photoelectric coupler is grounded, the pull-up resistor is connected between the pull-up power supply and the third pin of the first photoelectric coupler, the anode of the first diode is connected to the drain of the first NMOS tube, and the cathode of the first diode is connected to the excitation power supply.

2. A detection control circuit according to claim 1, characterized in that: The isolation module includes a second photocoupler and a second transistor, the base of the second transistor is connected to the detection signal, the emitter of the second transistor is grounded, the collector of the second transistor is connected to the third pin of the second photocoupler, and the fifth pin of the second photocoupler is connected to the input end of the voltage follower module.

3. A servo motor driver, characterized in that: The method comprises the detection control circuit as claimed in any one of claims 1 to 2.

4. A servo motor, characterized in that: The servo motor driver comprises the servo motor driver as claimed in claim 3.

5. A detection method, characterized in that: Applied to the detection control circuit according to claim 1, the method comprises: Receive the braking resistor enable command; Get detection signal setting information; Sending the detection signal to a voltage follower module; Receive feedback signals to determine whether the braking resistor is working properly.

6. A detection method according to claim 5, characterized in that: Also includes: If the brake resistor does not work properly, an alarm will sound.

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