Discharge device

Abstract

The present application relates to a discharge device, including a signal isolation device, a switch tube, a first diode, an energy storage container, a discharge circuit and a sampling circuit, wherein the signal isolation device is connected to the control end of the switch tube and the sampling circuit, the first end of the switch tube is grounded, the second end of the switch tube is connected to the discharge circuit, the discharge circuit is connected to the bus and the cathode of the first diode, the first end of the energy storage container is connected to the common end of the first diode and the discharge circuit, the second end of the energy storage container is connected to the first end of the switch tube, and the sampling circuit is connected to the anode of the first diode and the second end of the energy storage container. When the drive controller is powered off, at this time, due to the reverse cutoff of the first diode, the voltage on the anode side of the first diode drops to 0V instantly, the level sampled by the sampling circuit is a low level, the signal isolation device is turned on to control the switch tube to turn on, and the bus-discharge circuit-switch tube-ground terminal forms a discharge loop, which can quickly release the bus power, and the discharge speed is fast.

Description

Technical Field

[0001] The present application relates to the technical field of charge and discharge management, and in particular to a discharge device. Background Art

[0002] At present, most drive controller motherboards use electrolytic capacitors to stabilize the bus voltage. When working, they provide a stable bus voltage for the inverter module. After the drive controller is powered off during normal operation, the large amount of energy stored in the bus capacitor takes a long time to be consumed, which greatly affects the efficiency of after-sales / experimental replacement of the controller. If the after-sales / experimental replacement of the controller is needed immediately, the bus power is not consumed, which can easily cause electric shock. The traditional circuit discharges slowly. Summary of the invention

[0003] Based on this, it is necessary to provide a discharge device with a fast discharge speed to address the problem of slow discharge speed of traditional circuits.

[0004] A discharge device comprises a signal isolation device, a switch tube, a first diode, an energy storage container, a discharge circuit and a sampling circuit, wherein the signal isolation device is connected to a control end of the switch tube and the sampling circuit, the first end of the switch tube is grounded, the second end of the switch tube is connected to the discharge circuit, the discharge circuit is connected to a bus and a cathode of the first diode, the first end of the energy storage container is connected to a common end of the first diode and the discharge circuit, the second end of the energy storage container is connected to the first end of the switch tube, and the sampling circuit is connected to an anode of the first diode and a second end of the energy storage container.

[0005] In the above-mentioned discharge device, the bus is used to connect the drive controller. When the drive controller is powered on, the level sampled by the sampling circuit is a high level. At this time, the signal isolation device is cut off, the switch tube is in a disconnected state, and the bus is not discharged; when the drive controller is powered off, the energy storage container serves as a bus energy storage device to maintain the bus voltage. At this time, due to the reverse cutoff of the first diode, the voltage on the anode side of the first diode drops to 0V instantly, the level sampled by the sampling circuit is a low level, the signal isolation device is turned on to control the switch tube to turn on, and the bus-discharge circuit-switch tube-ground terminal forms a discharge loop, which can quickly release the bus electric energy and has a fast discharge speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A structural block diagram of a discharge device in one embodiment;

[0007] Figure 2 It is a structural block diagram of a discharge device in another embodiment;

[0008] Figure 3 A structural block diagram of a discharge device in yet another embodiment;

[0009] Figure 4 FIG. 4 is a structural block diagram of a discharge device in yet another embodiment. DETAILED DESCRIPTION

[0010] In one embodiment, Figure 1 As shown, a discharge device includes a signal isolation device 110, a switch tube 120, a first diode, an energy storage container 130, a discharge circuit 140 and a sampling circuit 150. The signal isolation device 110 is connected to the control end of the switch tube 120 and the sampling circuit 150. The first end of the switch tube 120 is grounded, the second end of the switch tube 120 is connected to the discharge circuit 140, the discharge circuit 140 is connected to the bus and the cathode of the first diode, the first end of the energy storage container 130 is connected to the common end of the first diode and the discharge circuit 140, the second end of the energy storage container 130 is connected to the first end of the switch tube 120, and the sampling circuit 150 is connected to the anode of the first diode and the second end of the energy storage container 130.

[0011] Specifically, in the present embodiment, the energy storage container is an energy storage capacitor. When the level sampled by the sampling circuit is a high level, the signal isolation device is cut off and the switch tube is not turned on. When the level sampled by the sampling circuit is a low level, the signal isolation device is turned on and the switch tube is turned on. The first diode D3 is a clamping diode to ensure that when the drive controller is powered off, the level on the anode side of the first diode, i.e., the level on the P1 side, is not affected by the bus P-level voltage, so that the level change on the P1 side is real-time, i.e., the P1 level can drop to a certain level (0V) at the moment of power failure, so that the signal isolation device can be controlled to be turned on in real time. Otherwise, when the drive controller is powered off, the signal isolation device can only be triggered to be turned on when the bus voltage is consumed to a certain voltage. If the bus power is not consumed, it is easy to cause electric shock, which greatly affects the efficiency of after-sales / experimental replacement of the controller. Among them, the reverse withstand voltage of the first diode D3 needs to be greater than the bus P-level voltage.

[0012] In the above-mentioned discharge device, the bus is used to connect the drive controller. When the drive controller is powered on, the level sampled by the sampling circuit is a high level. At this time, the signal isolation device is cut off, the switch tube is in a disconnected state, and the bus is not discharged; when the drive controller is powered off, the energy storage container serves as a bus energy storage device to maintain the bus voltage. At this time, due to the reverse cutoff of the first diode, the voltage on the anode side of the first diode drops to 0V instantly, the level sampled by the sampling circuit is a low level, the signal isolation device is turned on to control the switch tube to turn on, and the bus-discharge circuit-switch tube-ground terminal forms a discharge loop, which can quickly release the bus electric energy and has a fast discharge speed.

[0013] In one embodiment, Figure 2As shown, the sampling circuit 150 includes a first voltage-dividing resistor and a second voltage-dividing resistor, the first end of the first voltage-dividing resistor is connected to the anode of the first diode, the second end of the first voltage-dividing resistor is connected to the first end of the second voltage-dividing resistor, the second end of the second voltage-dividing resistor is connected to the second end of the energy storage container, and the common end of the first voltage-dividing resistor and the second voltage-dividing resistor is connected to the signal isolation device.

[0014] Specifically, when the drive controller is powered on, the sampling circuit obtains a high level through the first voltage-dividing resistor R6 and the second voltage-dividing resistor R7. At this time, the signal isolation device is cut off, the switch tube Q1 is in an off state, and the bus P is not discharged; when the drive controller is powered off, the energy storage capacitor C2 serves as a bus energy storage device to maintain the bus voltage. At this time, due to the reverse cutoff of the first diode D3, the voltage on the P1 side drops to 0V instantly, and the sampling circuit obtains a low level through the first voltage-dividing resistor R6 and the second voltage-dividing resistor R7, and controls the drive signal isolation device to be turned on in real time, controls the switch tube Q1 to be turned on, and forms a discharge loop between the bus P-discharge circuit-switch tube Q1-ground terminal, which can quickly release the bus power.

[0015] In one embodiment, the discharge circuit includes a discharge resistor, a first end of the discharge resistor is connected to the second end of the switch tube, and a second end of the discharge resistor is connected to the cathode of the first diode.

[0016] Specifically, when the level sampled by the sampling circuit is a low level, the driving signal isolation device is controlled in real time to turn on, thereby controlling the switch tube Q1 to turn on, and the bus P-discharge resistor R2-switch tube Q1-ground terminal GND forms a discharge loop, which can quickly release the bus power.

[0017] In one embodiment, Figure 3 As shown, the discharge circuit 140 further includes a second diode, an anode of the second diode is connected to the first end of the discharge resistor, and a cathode of the second diode is connected to the second end of the discharge resistor.

[0018] Specifically, the second diode D1 is a freewheeling diode. The second diode provides a freewheeling circuit for the discharge resistor R2 to avoid the occurrence of surge voltage when the switch tube Q1 is turned off, thereby protecting the discharge resistor R2 from being broken down or burned by the induced voltage. The reverse withstand voltage of the second diode D1 needs to be greater than the bus P-level voltage.

[0019] In one embodiment, Figure 4 As shown, the discharge device also includes a pull-down resistor and a Zener diode, the first end of the pull-down resistor is connected to the common end of the signal isolation device and the control end of the switch tube, the second end of the pull-down resistor is grounded, the anode of the Zener diode is connected to the second end of the pull-down resistor, and the cathode of the Zener diode is connected to the first end of the pull-down resistor.

[0020] Specifically, R1 is a pull-down resistor at the control end of the switch tube Q1, and D2 is a voltage-stabilizing diode. The functions of R1 and D2 are to ensure the stability of the output drive signal of the signal isolation device and to prevent the control end of the switch tube from malfunctioning and the operation voltage from being too high, causing damage to the switch tube.

[0021] In one embodiment, the signal isolation device is a driving optocoupler, the primary side of the driving optocoupler is connected to the sampling circuit, and the secondary side of the driving optocoupler is connected to the control end of the switch tube.

[0022] Specifically, when the signal isolation device is a driving optocoupler U1, the primary side pin 3 of the driving optocoupler is connected to the sampling circuit, the pin 1 is also used to connect to the external power supply +3.3V, the secondary side pin 5 of the driving optocoupler is connected to the control end G of the switch tube Q1, the secondary side pin 4 of the driving optocoupler is grounded, and the secondary side pin 6 of the driving optocoupler is also used to connect to the external power supply +15V.

[0023] In one embodiment, the discharge device further includes a driving resistor, a first end of the driving resistor is connected to the secondary side of the driving optocoupler, and a second end of the driving resistor is connected to the control end of the switch tube.

[0024] Specifically, the driving resistor R3 is the driving resistor of the switch tube control end. The resistance value of the driving resistor R3 can be determined according to different driving optocouplers U1 (wherein the value range of R3 cannot exceed the driving capability of the driving optocoupler). The formula can be used: Calculate the minimum current limiting resistor value of the switch control terminal that the driver optocoupler can support. (V CC is the supply voltage of the output stage, V OL I is the voltage when driving the optocoupler to output the limiting current. OLPEAK is the limiting current value that can be output by the driving optocoupler).

[0025] In one embodiment, the discharge device further includes a current limiting resistor, a first end of the current limiting resistor is used to connect to an external power supply, and a second end of the current limiting resistor is connected to a primary end of the driving optocoupler.

[0026] Specifically, R5 is a current limiting resistor on the primary side of the driving optocoupler U1. The appropriate resistance value is adjusted according to the selected driving optocoupler to limit the current in the branch to prevent excessive current from burning out the driving optocoupler in series.

[0027] In one embodiment, the discharge device further includes a first filter capacitor and a second filter capacitor, the first filter capacitor is connected in parallel with the primary side of the driving optocoupler; the first end of the second filter capacitor is connected to the secondary side of the driving optocoupler, and the second end of the second filter capacitor is grounded.

[0028] Specifically, the first filter capacitor C3 and the second filter capacitor C1 are drive signal filter capacitors, which function to filter out high-frequency interference and ensure the reliability of input and output signals.

[0029] In one embodiment, the switch tube is an NPN transistor or an NMOS tube or an insulated gate bipolar transistor.

[0030] In a detailed embodiment, Figure 4 As shown, the discharge device includes a current limiting resistor R5, a driving optocoupler U1, a first filter capacitor C3, a second filter capacitor C1, a driving resistor R3, a pull-down resistor R1, a voltage regulator diode D2, a switch tube Q1, a capacitor C2, a discharge resistor R2, a freewheeling diode D1, a clamping diode D3, a first voltage divider resistor R6 and a second voltage divider resistor R7. The first end of the current limiting resistor is used to connect to an external power supply, the second end of the current limiting resistor is connected to the primary side pin 1 of the driving optocoupler, the pin 3 of the primary side of the driving optocoupler is connected to the sampling circuit, the first filter capacitor is connected in parallel with the primary side of the driving optocoupler, the pin 6 of the secondary side of the driving optocoupler is used to connect to an external power supply, the pin 5 of the secondary side of the driving optocoupler is connected to the first end of the driving resistor, the pin 4 of the secondary side of the driving optocoupler is grounded, the second end of the driving resistor is connected to the control end of the switch tube, the first end of the switch tube is grounded, and the The second end is connected to the anode of the freewheeling diode and the first end of the discharge resistor, the freewheeling diode and the discharge resistor are connected in parallel, the other end is connected to the busbar and the cathode of the clamping diode, the first end of the energy storage container is connected to the busbar, the other end of the energy storage container is grounded, the first end of the first voltage-dividing resistor is connected to the anode of the first diode, the second end of the first voltage-dividing resistor is connected to the first end of the second voltage-dividing resistor, the second end of the second voltage-dividing resistor is connected to the second end of the energy storage container, the common end of the first voltage-dividing resistor and the second voltage-dividing resistor is connected to the primary side of the driving optocoupler, the first end of the pull-down resistor is connected to the common end of the signal isolation device and the control end of the switch tube, the second end of the pull-down resistor is grounded, the anode of the Zener diode is connected to the second end of the pull-down resistor, the cathode of the Zener diode is connected to the first end of the pull-down resistor, the first end of the second filter capacitor is connected to the secondary side of the driving optocoupler, and the second end of the second filter capacitor is grounded.

[0031] For the above-mentioned discharge device, when the driving controller is powered on, the sampling circuit obtains a high level through the voltage-dividing resistors R6 and R7. At this time, the primary side of the driving optocoupler U1 is cut off, and the switch tube Q1 is in an off state, and the bus is not discharged; when the driving controller is powered off, C2 serves as a bus energy storage capacitor to maintain the bus voltage. At this time, due to the reverse cutoff of the first diode D3, the voltage on the P1 side drops to 0V, and the sampling circuit obtains a low level through the voltage-dividing resistors R6 and R7, driving the primary side diode of the optocoupler U1 to turn on, and the secondary side to turn on. +15V controls the switch tube to turn on through the Q1 control terminal G. At this time, the bus P-discharge resistor R2-switch tube Q1-GND forms a discharge loop, which quickly releases the bus electric energy and has a fast discharge speed, thereby ensuring the personal safety of after-sales / experimental personnel and improving the efficiency of replacing the controller.

[0032] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0033] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A discharge device, characterized in that: It includes a signal isolation device, a switch tube, a first diode, an energy storage container, a discharge circuit and a sampling circuit, wherein the signal isolation device is connected to the control end of the switch tube and the sampling circuit, the first end of the switch tube is grounded, the second end of the switch tube is connected to the discharge circuit, the discharge circuit is connected to a bus and the cathode of the first diode, the first end of the energy storage container is connected to the bus, the first end of the energy storage container is also connected to the common end of the first diode and the discharge circuit, the second end of the energy storage container is connected to the first end of the switch tube, the sampling circuit is connected to the anode of the first diode and the second end of the energy storage container, and the reverse withstand voltage of the first diode is greater than the bus voltage of the bus; When the driving controller connected to the bus is powered off, the energy storage container maintains the bus voltage, the first diode is reversely cut off, and the sampling circuit samples a low level to turn on the signal isolation device, so that the signal isolation device controls the switch tube to turn on; The discharge circuit comprises a discharge resistor, a first end of the discharge resistor is connected to the second end of the switch tube, and a second end of the discharge resistor is connected to the cathode of the first diode; It also includes a second diode, wherein an anode of the second diode is connected to the first end of the discharge resistor, a cathode of the second diode is connected to the second end of the discharge resistor, and a reverse withstand voltage of the second diode is greater than a bus voltage of the bus; The first diode is a clamping diode, and the second diode is a freewheeling diode.

2. The discharge device according to claim 1, characterized in that: The sampling circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor, wherein the first end of the first voltage-dividing resistor is connected to the anode of the first diode, the second end of the first voltage-dividing resistor is connected to the first end of the second voltage-dividing resistor, the second end of the second voltage-dividing resistor is connected to the second end of the energy storage container, and the common end of the first voltage-dividing resistor and the second voltage-dividing resistor is connected to the signal isolation device.

3. The discharge device according to claim 1, characterized in that: It also includes a pull-down resistor and a voltage-stabilizing diode, wherein the first end of the pull-down resistor is connected to the common end of the signal isolation device and the control end of the switch tube, the second end of the pull-down resistor is grounded, the anode of the voltage-stabilizing diode is connected to the second end of the pull-down resistor, and the cathode of the voltage-stabilizing diode is connected to the first end of the pull-down resistor.

4. The discharge device according to claim 1, characterized in that: The signal isolation device is a driving optocoupler, the primary side of the driving optocoupler is connected to the sampling circuit, and the secondary side of the driving optocoupler is connected to the control end of the switch tube.

5. The discharge device according to claim 4, characterized in that: It also includes a driving resistor, a first end of the driving resistor is connected to the secondary side of the driving optical coupler, and a second end of the driving resistor is connected to the control end of the switch tube.

6. The discharge device according to claim 4, characterized in that: It also includes a current limiting resistor, a first end of which is used to connect to an external power supply, and a second end of which is connected to the primary side of the driving optical coupler.

7. The discharge device according to claim 4, characterized in that: It also includes a first filter capacitor and a second filter capacitor, wherein the first filter capacitor is connected in parallel with the primary side of the driving optocoupler; the first end of the second filter capacitor is connected to the secondary side of the driving optocoupler, and the second end of the second filter capacitor is grounded.

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