Power-on buffer hardware circuit of monorail hoist driver

Abstract

The invention relates to the technical field of system control, and particularly discloses a monorail hoist driver power-on buffer hardware circuit which comprises a bus partition diode D1, a divider resistor R1, a divider resistor R2, a divider resistor R3, a divider resistor R4, a buffer loop relay K2, a power supply filter capacitor C1, a power supply voltage-regulator tube Z1, a main loop relay K1, a control loop capacitor C2 and a power supply voltage-regulator tube Z2. Through the arrangement of the power-on buffer hardware circuit, when rated bus voltage is input into the monorail hoist driver, it is guaranteed that a buffer loop relay K2 can be closed, after the buffer loop relay K2 is closed and the bus voltage behind a buffer loop is electrified, through the arrangement of the power-on buffer hardware circuit, a main loop relay K1 is closed, and after the main loop relay K1 is closed, the buffer loop relay K2 is closed. The power-on buffer hardware circuit is used for solving the technical problem that the monorail crane driver fails to start due to the fact that parameters of T0 and I0 are solidified in a battery management system, and stable establishment of voltage of the monorail crane driver can be guaranteed through the power-on buffer hardware circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of system control, and more specifically to a power-on buffer hardware circuit for a monorail crane driver. Background Art

[0002] When a lithium battery is selected as the power supply for a monorail crane driver, the battery management system (BMS) collects various battery information during the charging and discharging processes of the lithium battery pack. The BMS will detect whether the battery output current is greater than the threshold current I0 within the initialization time T0 of the battery, and based on this, determine whether there is a short circuit or insulation fault in the battery's subsequent load. Considering the safe and reliable operation, most manufacturers will fix the parameters of T0 and I0 in the system and cannot be set. Affected by this, during the power-on process of the monorail crane driver, the lithium battery is directly connected to the internal capacitor bus of the monorail crane driver through the internal buffer resistor R of the driver. Due to the characteristics of the capacitor, there will be a relatively large current I at the moment of power-on of the monorail crane. If the amplitude of this current is greater than I0, it will cause the battery system to report an insulation fault and the monorail crane driver to fail to start. Although the monorail crane driver can select different power-on buffer resistors R according to the battery management system parameters of different manufacturers, in the case where the threshold current I0 parameter of some battery management manufacturers is small, only the resistance value of the power-on buffer resistor of the monorail crane driver can be increased to reduce the current I at the moment of power-on. When the resistance value of the buffer resistor R is large, it will cause the device bus voltage to fail to be established and the control circuit to lose power, ultimately still resulting in the failure of the monorail crane driver to start. In the related technologies of existing monorail crane drivers, currently, there is no technical solution specifically for solving the problem of the failure of the monorail crane driver to start caused by the fixed parameters of T0 and I0. Summary of the Invention

[0003] Aiming at the problems in the prior art, the present invention provides a power-on buffer hardware circuit for a monorail crane driver, which is used to solve the technical problem that the battery management system causes the monorail crane driver to fail to start due to the fixed parameters of T0 and I0.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a power-on buffer hardware circuit for a monorail crane driver, used for the power-on buffer of the monorail crane driver. The power-on buffer hardware circuit includes a bus isolation diode D1, a voltage-dividing resistor R1, a voltage-dividing resistor R2, a voltage-dividing resistor R3, a voltage-dividing resistor R4, a buffer circuit relay K2, a power supply filtering capacitor C1, a power supply voltage stabilizing diode Z1, a main circuit relay K1, a control circuit capacitor C2, and a power supply voltage stabilizing diode Z2.

[0005] Preferably, the voltage-dividing resistors R1, R2, R3 and R4 are connected in series between the positive and negative busbars of the monorail crane driver, the forward end of the busbar isolating diode D1 is connected to the positive busbar of the rear stage of the power-on buffer circuit, and the busbar isolating diode D1 is connected to the connection position of the voltage-dividing resistors R1 and R2.

[0006] Preferably, one end of the control coil of the main circuit relay K1 is connected to the connection position of the voltage-dividing resistor R2 and the voltage-dividing resistor R3, and the other end of the main circuit relay K1 is connected to the negative bus of the monorail crane driver. One end of the control coil of the buffer circuit relay K2 is connected to the connection position of the voltage-dividing resistor R3 and the voltage-dividing resistor R4, and the other end of the control coil of the buffer circuit relay K2 is connected to the negative bus of the monorail crane driver. The power supply filter capacitor C1 is connected in parallel with the voltage-dividing resistor R4.

[0007] Preferably, the power supply voltage regulator tube Z1 is connected in parallel with the control coil of the buffer circuit relay K2, the filter capacitor C1 and the power supply voltage regulator tube Z1 are connected through the auxiliary normally closed contact of the main circuit relay K1, and the control circuit capacitor C2 and the power supply voltage regulator tube Z2 are connected in parallel with the control coil of the main circuit relay K1.

[0008] Preferably, the control coil pull-in voltage of the main circuit relay K1 is greater than the control coil pull-in voltage of the buffer circuit relay K2.

[0009] Compared with the prior art, the beneficial effect of the present invention is as follows: through the setting of the power-on buffer hardware circuit, after the input bus of the monorail crane driver is powered, the input power charges the power supply filter capacitor C1 through the voltage-dividing resistor R1, the voltage-dividing resistor R2, and the voltage-dividing resistor R3, until the voltage across the power supply filter capacitor C1 reaches the pickup voltage of the buffer loop relay K2 coil, and then the buffer loop relay K2 is controlled to be attracted, so that the input power charges the bus capacitor C through the buffer resistor R, and when the voltage Uc across the bus capacitor C slowly rises to 70% of Uo, the voltage-dividing resistor R2, the voltage-dividing resistor R3, and the voltage-dividing resistor R4 form a voltage-dividing circuit, so that the control loop capacitor C2 is charged. The terminal voltage reaches the pull-in voltage of the main circuit relay K1 coil, and then controls the main circuit relay K1 to pull in. Since the normally closed point of the main circuit relay K1 is connected in series to the power supply circuit of the buffer circuit relay K2 coil, after the main circuit relay K1 is pulled in, the buffer circuit relay K2 is controlled to be disconnected, that is, when the monorail crane driver inputs the rated bus voltage, it is ensured that the buffer circuit relay K2 can be pulled in, and the main circuit relay K1 cannot be pulled in, so as to realize the power-on buffering of the monorail crane driver. Compared with the prior art processing method of increasing the resistance value of the buffer resistor of the monorail crane driver, the power-on buffering hardware circuit can ensure the stable establishment of the voltage of the monorail crane driver. This technical solution also fills the technical gap of the failure of the monorail crane driver to start due to the solidification of the parameters of T0 and I0. Brief Description of the Drawings

[0010] The present invention will be further described below in conjunction with the drawings and embodiments.

[0011] Figure 1 It is a circuit diagram of the power-on buffer hardware circuit for the present invention.

[0012] Figure 2 It is a schematic diagram of the monorail hoist system topology. Detailed Embodiments

[0013] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0014] Please refer to the accompanying drawings of the specification Figure 1 The power-on buffer hardware circuit of the monorail hoist driver described in the present invention is used for the power-on buffer of the monorail hoist driver. The power-on buffer hardware circuit includes a bus isolation diode D1, voltage-dividing resistors R1, R2, R3, R4, a buffer circuit relay K2, a power supply filtering capacitor C1, a power supply voltage stabilizing diode Z1, a main circuit relay K1, a control circuit capacitor C2, and a power supply voltage stabilizing diode Z2.

[0015] In an alternative solution of this embodiment, the voltage-dividing resistors R1, R2, R3, and R4 are connected in series between the positive and negative buses of the monorail hoist driver. The positive end of the bus isolation diode D1 is connected to the positive bus at the rear stage of the power-on buffer circuit, and the bus isolation diode D1 is connected to the connection position of the voltage-dividing resistor R1 and the voltage-dividing resistor R2.

[0016] In an alternative solution of this embodiment, one end of the control coil of the main circuit relay K1 is connected to the connection position of the voltage-dividing resistor R2 and the voltage-dividing resistor R3, the other end of the main circuit relay K1 is connected to the negative bus of the monorail hoist driver, one end of the control coil of the buffer circuit relay K2 is connected to the connection position of the voltage-dividing resistor R3 and the voltage-dividing resistor R4, the other end of the control coil of the buffer circuit relay K2 is connected to the negative bus of the monorail hoist driver, and the power supply filtering capacitor C1 is connected in parallel with the voltage-dividing resistor R4.

[0017] In an alternative solution of this embodiment, the power supply voltage stabilizing diode Z1 is connected in parallel with the control coil of the buffer circuit relay K2, the K2 filtering capacitor C1 and the power supply voltage stabilizing diode Z1 are connected through the auxiliary normally closed contact of the main circuit relay K1, and the control circuit capacitor C2 and the power supply voltage stabilizing diode Z2 are connected in parallel with the control coil of the main circuit relay K1.

[0018] In an alternative solution of this embodiment, the suction voltage of the control coil of the main circuit relay K1 is greater than the suction voltage of the control coil of the buffer circuit relay K2.

[0019] Please refer to the accompanying drawings of the specification Figure 1 The present invention provides a power-on buffering solution without a control system and an external power supply, which is implemented by a power-on buffering hardware circuit. The specific steps are as follows:

[0020] Step S1: After the monorail crane driver is powered on with an amplitude of Ui, the input power supply charges the power supply filtering capacitor C1 through the voltage-dividing resistors R1, R2, and R3.

[0021] Step S2: After the voltage across the power supply filtering capacitor C1 reaches the coil suction voltage of the buffer circuit relay K2, the buffer circuit relay K2 is suctioned. The power supply voltage-regulating diode Z1 prevents the supply voltage of the buffer circuit relay K2 coil from exceeding the rated value and causing damage. After the buffer circuit relay K2 is suctioned, the input power supply charges the bus capacitor C through the buffer resistor R (as shown in the figure). Figure 2 shown).

[0022] Step S3: When the voltage Uc across the bus capacitor C slowly rises to 70% of Ui, a voltage-dividing circuit composed of the voltage-dividing resistors R2, R3, and R4 is used to make the voltage across the control loop capacitor C2 of the main circuit relay K1 reach the suction voltage of the main circuit relay K1 coil, thereby controlling the main circuit relay K1 to be suctioned. The power supply voltage-regulating diode Z2 prevents the supply voltage of the main circuit relay K1 coil from exceeding the rated value and causing damage.

[0023] Step S4: The normally closed point of the main circuit relay K1 is connected in series to the power supply circuit of the buffer circuit relay K2 coil. After the main circuit relay K1 is suctioned, it controls the buffer circuit relay K2 to be disconnected. That is, after the monorail crane power-on buffering process ends, when the main circuit relay K1 is suctioned, the buffer circuit relay K2 can be disconnected, thereby preventing the associated damage of the buffer resistor circuit caused by the failure and disconnection of the main circuit relay K1 during the operation of the equipment. Among them, D1 is a blocking resistor to prevent the input from charging the monorail crane driver capacitor bus through the voltage-dividing resistor R1 when the buffer circuit relay K2 is not suctioned, resulting in a large current on the outgoing line exceeding I0 and causing the battery management system to report a fault.

[0024] After the power-on buffer hardware circuit realizes the input of the positive and negative busbars of the monorail crane driver, the control coil of the buffer circuit relay K2 is energized and attracted through the voltage-dividing circuit composed of the voltage-dividing resistor R1, the voltage-dividing resistor R2, the voltage-dividing resistor R3, and the voltage-dividing resistor R4. After the buffer circuit relay K2 is attracted, the bus capacitor C is charged. When the voltage across the bus capacitor C reaches a certain value, the control coil of the main circuit relay K1 is energized and attracted. After the main circuit relay K1 is attracted, the normally closed contact of the main circuit relay K1 changes from closed to open, the coil of the buffer circuit relay K2 loses power, and the buffer circuit relay K2 disconnects. By adjusting the circuit parameters, the problem that the current value exceeds the threshold current during the power-on process is effectively solved, making the power-on process of the monorail crane driver simple and reliable. In addition, after the power-on buffer of the buffer circuit relay K2 is completed, it disconnects, effectively avoiding the large current passing through the buffer circuit relay K2 and the buffer resistor R due to the failure or misoperation of the main circuit relay K1 during the operation of the monorail tram driver, and avoiding the expansion of the fault.

[0025] In a further embodiment, the present invention provides an implementation manner of the power-on buffer hardware circuit for the power-on control circuit of the monorail crane driver, and the implementation steps are as follows:

[0026] First, initialize the detection time of the battery management system to 5 s, the threshold current to 1 A, the battery operating voltage to 300 V, select three driving components (six drivers) for the monorail crane, the pulling-in voltage of the main circuit relay K1 is 24 V, and the pulling-in voltage of the buffer circuit relay K2 is 12 V.

[0027] Since there are three driving components and a total of six drivers in the system, it is required that the single driving current does not exceed 166 mA. Then:

[0028]

[0029] The sum of the resistance values of the voltage-dividing resistor R1, the voltage-dividing resistor R2, the voltage-dividing resistor R3, and the voltage-dividing resistor R4 shall not be less than 1800 Ω, and 10.26 K is taken.

[0030] After the system is powered on, the coil voltage of the buffer circuit relay K2 needs to exceed 12 V. Then:

[0031]

[0032] R4 ≥ 0.04×(R1 + R2 + R3 + R4) = 450 Ω;

[0033] The voltage-dividing resistor R4 is selected as 510 Ω, and the voltage of the power supply filter capacitor C1 is 14.9 V, meeting the pulling-in condition.

[0034] After the system is powered on, the coil voltage of the main circuit relay K1 needs to be lower than 24 V. Then

[0035] R3 ≤ 0.08×(R1 + R2 + R3 + R4) - R3 = 310Ω;

[0036] The voltage-dividing resistor R3 has a value of 250Ω. When the main circuit relay K1 is not closed, the voltage across the control circuit capacitor C2 is 22V, which is lower than the relay's pulling-in voltage of 24V.

[0037] When the voltage Uc across the capacitor bus of the monorail crane driver is 70% of the battery voltage Uo, i.e., 210V, K1 needs to pull in, then there is:

[0038]

[0039] The voltage-dividing resistor R2 has a value of 5.6K, and at the same time, the voltage-dividing resistor R1 has a value of 3.9K. Then, the voltage across the control circuit capacitor C2 is 24V, and the main circuit relay K1 pulls in.

[0040] Since the power-on initialization time is 5s, the buffer circuit relay K2 cannot be closed within 5s, that is, the power supply filter capacitor C1 cannot reach the working voltage within 5s. According to the existing technology, for a first-order RC charging circuit, it takes 3 - 5 times the time constant to fully charge the voltage across the capacitor. If it is less than 1.6s, it can meet the requirement, then there is:

[0041]

[0042] Select the power supply filter capacitor C1 as 470uf, and select the control circuit capacitor C2 as 10uf. Calculated according to 3 times the time constant, the buffer circuit relay K2 pulls in 15s after the monorail crane driver is powered on, which can avoid the power-on insulation detection time of the battery detection system.

[0043] Select the buffer resistor R as 20Ω, select the bus filter capacitor as 200uf, the time constant of the main circuit is 4ms, and the voltage across the main circuit capacitor bus reaches 210V quickly within 10ms. The bus capacitor quickly charges the control circuit capacitor C2 through the voltage-dividing resistor R2. The voltage-dividing resistor R2 and the control circuit capacitor C2 form a charging circuit, and the charging time constant is 56ms. During the charging process of the power supply filter capacitor C1, the voltage across the control circuit capacitor C2 has been synchronously charged to 22V. Considering that the voltage difference from 22V to 24V is only 2V and the relay action time is about 100ms, the pulling-in time of the main circuit relay K1 can be ignored. After the main circuit relay is closed, the coil of the buffer circuit relay K2 loses power, and the buffer circuit relay K2 disconnects, and the charging process is completed.

[0044] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. The power-on buffering hardware circuit for the monorail crane driver, which is used for power-on buffering of the monorail crane driver, is characterized in that: The power-on buffer hardware circuit includes a bus isolation diode D1, voltage-dividing resistors R1, R2, R3, R4, a buffer circuit relay K2, a power supply filter capacitor C1, a power supply voltage regulator Z1, a main circuit relay K1, a control circuit capacitor C2, and a power supply voltage regulator Z2.

2. The power-on buffering hardware circuit of the monorail crane driver according to claim 1, characterized in that: The voltage-dividing resistors R1, R2, R3, and R4 are connected in series between the positive and negative buses of the monorail crane driver. The positive terminal of the bus isolation diode D1 is connected to the positive bus at the rear stage of the power-on buffer circuit, and the bus isolation diode D1 is connected to the connection position of the voltage-dividing resistor R1 and the voltage-dividing resistor R2.

3. The power-on buffer hardware circuit of the monorail crane driver according to claim 2, characterized in that: One end of the control coil of the main circuit relay K1 is connected to the connection position of the voltage-dividing resistor R2 and the voltage-dividing resistor R3, and the other end of the main circuit relay K1 is connected to the negative bus of the monorail crane driver. One end of the control coil of the buffer circuit relay K2 is connected to the connection position of the voltage-dividing resistor R3 and the voltage-dividing resistor R4, and the other end of the control coil of the buffer circuit relay K2 is connected to the negative bus of the monorail crane driver. The power supply filter capacitor C1 is connected in parallel with the voltage-dividing resistor R4.

4. The power-on buffering hardware circuit of the monorail crane driver according to claim 3, characterized in that: The power supply voltage regulator Z1 is connected in parallel with the control coil of the buffer circuit relay K2. The filter capacitor C1 and the power supply voltage regulator Z1 are connected through the auxiliary normally closed contact of the main circuit relay K1. The control circuit capacitor C2 and the power supply voltage regulator Z2 are connected in parallel with the control coil of the main circuit relay K1.

5. The power-on buffering hardware circuit of the monorail crane driver according to claim 1, wherein: The pull-in voltage of the control coil of the main circuit relay K1 is greater than the pull-in voltage of the control coil of the buffer circuit relay K2.

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