Sto device with star sealing function and control method thereof

Abstract

The application discloses a kind of STO devices with star sealing function, including first channel loop, power channel loop, second channel loop, upper bridge arm buffer, lower bridge arm buffer, wherein the input end of the first channel loop is used to receive STO input signal and star sealing signal, and the output end of first channel loop outputs enable signal to upper bridge arm buffer;The input end of the power channel loop is used to receive power signal and star sealing signal, and the output end of power channel loop outputs power signal to upper bridge arm buffer and lower bridge arm buffer;The input end of the second channel loop is used for star sealing signal, and the output end of second channel loop outputs enable signal to lower bridge arm buffer.The application also discloses a kind of control method of STO device with star sealing function.

Description

TECHNICAL FIELD

[0001] The application relates to an electromechanical device, in particular to an STO device with a star blocking function. BACKGROUND

[0002] The STO (safety torque off) function is to disconnect the torque of the electromechanical device according to the safety specification when the trigger signal acts. The STO device functions to disconnect the trigger signal of the inverter unit for supplying power to the motor when the torque disconnect signal is triggered.

[0003] The star blocking device increases the damping of the motor energy consumption by short-circuiting the three-phase coil of the motor, so that the elevator can accelerate at a very small acceleration in an emergency. Since the short-circuiting of the three-phase coil of the motor requires the operation of the inverter unit, the STO function and the star blocking function are contradictory. Currently, the common method is to add a star blocking device after the STO device, and use an electronic star blocking device or an electromechanical star blocking product to implement the star blocking function. Since the electromechanical star blocking product has high cost, noise, contact wear and difficult diagnosis, the electronic star blocking device is generally selected to implement the star blocking function.

[0004] The STO device disconnects the trigger signals of the upper and lower arms of the inverter unit to realize the safety torque off function. The star blocking device is arranged after the STO device, and re-triggers one arm of the inverter unit, so that the hardware failure margin of the safety torque off function is reduced, and the safety is reduced. At this time, if the trigger signal of the other arm of the inverter unit in the STO device fails, the inverter unit will lose the torque off function, and the safety function will be lost. The power module of the other arm will be turned on, and since one arm is blocked by the star blocking function, the upper and lower arm modules are directly connected, which will cause damage to the power module. SUMMARY

[0005] The technical problem to be solved by the application is that when the star blocking function is effective, the power supply and the enable signal still maintain the STO function, and the safety of the safety torque off function is ensured.

[0006] In order to solve the above technical problem, the application discloses an STO device with a star blocking function, which comprises a first channel circuit, a power supply channel circuit, a second channel circuit, an upper arm buffer and a lower arm buffer. The input end of the first channel circuit is used for receiving an STO input signal and a star blocking signal, and the output end of the first channel circuit outputs an enable signal to the upper arm buffer. The input end of the power supply channel circuit is used for receiving a power supply signal and a star blocking signal, and the output end of the power supply channel circuit outputs a power supply signal to the upper arm buffer and the lower arm buffer. The input end of the second channel circuit is used for the star blocking signal, and the output end of the second channel circuit outputs an enable signal to the lower arm buffer.

[0007] Preferably, the input end of the power channel loop also receives the STO input signal.

[0008] Preferably, a driving cut-off device is further included for opening or cutting off the enable signals output by the first channel loop and the second channel loop and the power signals output by the power channel loop.

[0009] Preferably, the first channel loop comprises a first channel input loop and a first channel execution loop.

[0010] The power channel loop comprises a power channel input loop and a power channel execution loop.

[0011] The second channel loop comprises a second channel input loop and a second channel execution loop.

[0012] The STO device with the star sealing function further comprises a diagnosis loop,

[0013] The input end of the diagnosis loop receives signals of the first channel input loop, the power channel input loop and the second channel input loop and a star sealing signal.

[0014] The output end of the diagnosis loop outputs signals to the first channel execution loop, the power channel execution loop and the second channel execution loop.

[0015] The application further discloses a control method of the STO device with the star sealing function,

[0016] When the STO input signal does not trigger the STO function, the first channel loop outputs the enable signal of the upper bridge arm buffer; the second channel loop outputs the enable signal of the lower bridge arm buffer.

[0017] Preferably, when the STO input signal triggers the STO function, the first channel loop cuts off the enable signal of the upper bridge arm buffer; the second channel loop outputs the enable signal of the lower bridge arm buffer.

[0018] Preferably, when the power signal is normal and the STO input signal does not trigger the STO function, the power channel loop outputs the power of the upper bridge arm buffer and the power of the lower bridge arm buffer; when the power signal is abnormal or the STO input signal triggers the STO function, the power channel loop cuts off the power of the upper bridge arm buffer and the power of the lower bridge arm buffer.

[0019] Preferably, as long as the star sealing signal is triggered or the STO input signal is triggered, the valid enable signal is output to the upper bridge arm buffer; only when neither the star sealing signal nor the STO input signal is triggered, the enable signal of the upper bridge arm buffer is invalid.

[0020] Preferably, when the power signal is valid, the output power signal is enabled to the upper bridge arm buffer as long as the starve signal or the STO input signal is triggered; only when both the starve signal and the STO input signal are not triggered, the power signal of the upper bridge arm buffer is disabled.

[0021] Preferably, the STO device with the starve function further comprises a diagnosis circuit,

[0022] The first channel circuit comprises a first channel input circuit and a first channel execution circuit;

[0023] The power channel circuit comprises a power channel input circuit and a power channel execution circuit;

[0024] The second channel circuit comprises a second channel input circuit and a second channel execution circuit;

[0025] The diagnosis circuit receives the state signals of the first channel input circuit, the second channel input circuit and the power channel input circuit, and compares the state signals with those of the first channel execution circuit, the second channel execution circuit and the power channel execution circuit respectively; when the diagnosis circuit finds that any one of the three groups of state signals is inconsistent, the diagnosis signal is fed back to the first channel execution circuit, the second channel execution circuit and the power channel execution circuit respectively; the three execution circuits cut off all output signals, including the enable signals and the power of the upper bridge arm buffer and the enable signals and the power of the lower bridge arm buffer.

[0026] Compared with the prior art, when the starve function is activated, the power and the enable signal of the second channel still maintain the STO function, and the hardware failure margin = 1, which ensures the safety of the safety function of the safety torque off. At this time, if the trigger signal of the corresponding inverter unit of another path in the STO device fails, since the hardware failure margin = 1, the diagnosis circuit will be activated in time and all trigger signals and power will be cut off, ensuring the safety of the power module. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the circuit module of embodiment 1 of the present application.

[0028] Figure 2 It is a schematic diagram of the circuit module of embodiment 2 of the present application. DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0030] Embodiment 1

[0031] This invention discloses an STO device with electronic star-sealing function, including a first channel circuit, a power channel circuit, a second channel circuit, an upper bridge arm buffer, and a lower bridge arm buffer.

[0032] like Figure 1 As shown, in this embodiment, the first channel circuit includes a first channel input circuit (1a) and a first channel execution circuit (1b); the power channel circuit includes a power channel input circuit (3a) and a power channel execution circuit (3b); the second channel circuit includes a second channel input circuit (2a) and a second channel execution circuit (2b).

[0033] The input terminal of the first channel loop is used to receive the STO input signal and the star blocking signal, and the output terminal of the first channel loop outputs an enable signal to the upper bridge arm buffer; the input terminal of the power channel loop is used to receive the power signal and the star blocking signal, and the output terminal of the power channel loop outputs a power signal to the upper bridge arm buffer and the lower bridge arm buffer; the input terminal of the second channel loop is used for the star blocking signal, and the output terminal of the second channel loop outputs an enable signal to the lower bridge arm buffer.

[0034] Preferably, such as Figure 1 As shown, the input terminal of the power channel circuit can also receive the STO input signal.

[0035] Preferably, it may also include a diagnostic circuit (4).

[0036] The input terminal of the diagnostic circuit receives signals and block signals from the first channel input circuit, the power channel input circuit, and the second channel input circuit; the output terminal of the diagnostic circuit outputs signals to the first channel execution circuit, the power channel execution circuit, and the second channel execution circuit.

[0037] The working principle of this device is:

[0038] When the STO input signal (11) does not trigger the STO function, the first channel execution circuit (1b) outputs the enable signal of the upper bridge arm buffer (5); the second channel execution circuit (2b) outputs the enable signal of the lower bridge arm buffer (6). When the STO input signal (11) triggers the STO function, the first channel execution circuit (1b) cuts off the enable signal of the upper bridge arm buffer (5); the second channel execution circuit (2b) outputs the enable signal of the lower bridge arm buffer (6). When the power signal (12) is normal and the STO input signal (11) does not trigger the STO function, the power execution circuit (3b) outputs the power supply of the upper bridge arm buffer (5) and the power supply of the lower bridge arm buffer (6); when the power signal (12) is abnormal or the STO input signal (11) triggers the STO function, the power execution circuit (3b) cuts off the power supply of the upper bridge arm buffer (5) and the power supply of the lower bridge arm buffer (6).

[0039] This device also includes a star-blocking signal (13). When the star-blocking signal (13) is input into the first channel input circuit (1a), it forms an "OR" logic with the STO input signal (11) in the circuit, and is then input into the first channel execution circuit (1b) to output or turn off the enable signal of the upper bridge arm buffer (5). That is, if the star-blocking signal (13) or the STO input signal (11) does not trigger the STO function, a valid enable signal can be output to the upper bridge arm buffer as long as one of the above conditions is met; the enable signal of the upper bridge arm buffer (5) is invalid only when the star-blocking signal (13) or the STO input signal (11) triggers the STO function.

[0040] The star-blocking signal (13) is also input to the power channel input circuit (3a), forming an "OR" logic with the STO input signal (11) in the circuit, used to output or cut off the power supply to the upper bridge arm buffer (5). Under the premise that the power supply (12) is valid, if the star-blocking signal (13) or the STO input signal (11) does not trigger the STO function, the power supply signal can be output to the upper bridge arm buffer as long as one of the above conditions is met; only when the star-blocking signal (13) or the STO input signal (11) triggers the STO function will the power supply signal of the upper bridge arm buffer (5) be invalid.

[0041] Preferably, the device may further include a diagnostic circuit (4), which receives the status signal of the first channel input circuit (1a) and compares it with the status signal of the first channel execution circuit (1b); the circuit also receives the status signal of the second channel input circuit (2a) and compares it with the status signal of the second channel execution circuit (2b); the circuit also receives the status signal of the power channel input circuit (3a) and compares it with the status signal of the power channel execution circuit (3b). If any of the above three sets of signal states is inconsistent, the diagnostic signal is fed back to the first channel execution circuit (1b), the second channel execution circuit (2b) and the power channel execution circuit (3b). The above three execution circuits will cut off all output signals, including the enable signal and power supply of the upper bridge arm buffer (5) and the enable signal and power supply of the lower bridge arm buffer (6).

[0042] Example 2

[0043] like Figure 2 As shown, the difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 of the present invention further includes a drive cut-off device for turning on or off the enable signal output by the first channel circuit, the second channel circuit, and the power signal output by the power channel circuit.

[0044] Specifically, the diagnostic circuit (4) receives the status signal of the first channel input circuit (1a) and compares it with the status signal of the first channel execution circuit (1b); it also receives the status signal of the second channel input circuit (2a) and compares it with the status signal of the second channel execution circuit (2b); it also receives the status signal of the power channel input circuit (3a) and compares it with the status signal of the power channel execution circuit (3b), and when any of the three groups of signal states is inconsistent, it outputs a diagnostic signal to drive the cut-off device (7a, 7b, 7c, 7d) to cut off all output signals, including the enable signal of the upper bridge arm buffer (5) and the power supply, and the enable signal of the lower bridge arm buffer (6) and the power supply.

[0045] Compared with Example 1, Example 2 changes the diagnostic circuit trigger signal from the input first, second channel and power channel to drive a separate device to cut off all enable signals and power supply functions, which can avoid the failure of the cut-off function due to the failure of the first, second channel or power channel.

Claims

1. An STO device with a star-sealing function, characterized in that, This includes a first channel circuit, a power supply channel circuit, a second channel circuit, an upper bridge arm buffer, and a lower bridge arm buffer. The input terminal of the first channel loop is used to receive the STO input signal and the star blocking signal, and the output terminal of the first channel loop outputs an enable signal to the upper bridge arm buffer. The input terminal of the power channel loop is used to receive power signals and satellite blocking signals, and the output terminal of the power channel loop outputs power signals to the upper bridge arm buffer and the lower bridge arm buffer. The input terminal of the second channel loop is used for the star blocking signal, and the output terminal of the second channel loop outputs an enable signal to the lower bridge arm buffer. The first channel circuit includes a first channel input circuit and a first channel execution circuit; The power channel circuit includes a power channel input circuit and a power channel execution circuit; The second channel circuit includes a second channel input circuit and a second channel execution circuit; The STO device with satellite sealing function also includes a diagnostic circuit. The input terminal of the diagnostic circuit receives signals from the first channel input circuit, the power channel input circuit, the second channel input circuit, and the envelope signal. The output terminal of the diagnostic circuit outputs a signal to the first channel execution circuit, the power channel execution circuit, and the second channel execution circuit.

2. The STO device with sealing function as described in claim 1, characterized in that, The input terminal of the power channel circuit also receives the STO input signal.

3. The STO device with sealing function as described in claim 1, characterized in that, It also includes a drive cut-off device for turning on or off the enable signals output by the first channel circuit and the second channel circuit, as well as the power signal output by the power channel circuit.

4. A control method for an STO device with a star-sealing function as described in any one of claims 1-3, characterized in that, When the STO input signal does not trigger the STO function, the first channel circuit outputs the enable signal for the upper bridge arm buffer; the second channel circuit outputs the enable signal for the lower bridge arm buffer.

5. The control method for the STO device with sealing function as described in claim 4, characterized in that, When the STO input signal triggers the STO function, the first channel circuit cuts off the enable signal of the upper bridge arm buffer; the second channel circuit outputs the enable signal of the lower bridge arm buffer.

6. The control method for the STO device with sealing function as described in claim 4, characterized in that, When the power signal is normal and the STO input signal does not trigger the STO function, the power channel circuit outputs power to the upper bridge arm buffer and the lower bridge arm buffer; when the power signal is abnormal or the STO input signal triggers the STO function, the power channel circuit cuts off the power to the upper bridge arm buffer and the lower bridge arm buffer.

7. The control method for the STO device with sealing function as described in claim 4, characterized in that, A valid enable signal can be output to the upper arm buffer as long as the star-blocking signal is triggered or the STO input signal does not trigger the STO function; the enable signal of the upper arm buffer is invalid only when the star-blocking signal or the STO input signal triggers the STO function.

8. The control method for the STO device with sealing function as described in claim 4, characterized in that, When the power signal is valid, the power signal can be output to the upper bridge arm buffer as long as the star-blocking signal or the STO input signal does not trigger the STO function; the power signal of the upper bridge arm buffer is invalid only when the star-blocking signal or the STO input signal triggers the STO function.

9. The control method for the STO device with sealing function as described in claim 4, characterized in that, The STO device with satellite sealing function also includes a diagnostic circuit. The first channel circuit includes a first channel input circuit and a first channel execution circuit; The power channel circuit includes a power channel input circuit and a power channel execution circuit; The second channel circuit includes a second channel input circuit and a second channel execution circuit; The diagnostic circuit receives the status signals from the first channel input circuit, the second channel input circuit, and the power channel input circuit, and compares them with the status signals from the first channel execution circuit, the second channel execution circuit, and the power channel execution circuit, respectively. When the diagnostic circuit finds that any of the three sets of signal statuses is inconsistent, it feeds back the diagnostic signal to the first channel execution circuit, the second channel execution circuit, and the power channel execution circuit, respectively. The three execution circuits will then cut off all output signals, including the enable signal and power supply of the upper bridge arm buffer and the lower bridge arm buffer.

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