Control drive circuit, integrated control driver and ventilation system

Abstract

The utility model provides a control drive circuit, an integrated control driver and a ventilation system, and belongs to the technical field of power electronics. According to the control drive circuit, the output end of a direct current conversion circuit in the direct current power supply module and the output end of a rectification circuit in the alternating current power supply module are connected with a direct current bus in the direct current bus module, and there is no need to arrange a relay among a battery, an alternating current power supply and the direct current bus to switch alternating current power supply and direct current power supply. Therefore, the problem of abnormal power supply caused by relay failure in the switching process can be avoided or reduced. And the output ends of the rectifying circuit and the direct current conversion circuit which have reverse cut-off characteristics are connected in parallel to the direct current bus, so that the situation of current reverse flow is avoided, hot switching can be performed on alternating current and direct current, and the operation reliability of a system where the load is located is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power electronics, and particularly relates to a control driving circuit, an integrated control driver and a ventilation system. BACKGROUND

[0002] In rail transit, power supply of a train is transmitted from a high-voltage cable to the train by a pantograph, for use of the whole train. At some moments, the pantograph of the train may fail, which may cause abnormal power supply of the whole train. At this moment, a storage battery on the train can supply power to the ventilation system in time to ensure air circulation in a closed carriage.

[0003] An emergency ventilation scheme of an existing ventilation system is mostly to select whether to supply power by alternating current or by a storage battery through a relay, to judge whether the alternating current supplies power normally through a control board or other monitoring modules, and to control the relay to switch to the storage battery supply if the power supply is abnormal. The power supply form of the existing ventilation system may have a risk of failure of the relay switching, which will cause short circuit of 380V alternating current and 110V direct current, thereby causing circuit burning. CONTENT OF THE UTILITY MODEL

[0004] To solve the existing technical problems, the present application provides a control driving circuit, an integrated control driver and a ventilation system with high reliability.

[0005] According to a first aspect of the embodiment of the present application, a control driving circuit is provided, comprising a direct current bus module, an alternating current power supply module, a direct current power supply module, a driving module and a control module.

[0006] The direct current bus module comprises a direct current bus.

[0007] The alternating current power supply module comprises a rectifier circuit with reverse blocking characteristics, an input end of the rectifier circuit is connected with an alternating current power supply, and an output end of the rectifier circuit is connected with the direct current bus.

[0008] The direct current power supply module comprises a direct current conversion circuit with reverse blocking characteristics, an input end of the direct current conversion circuit is connected with a battery, and an output end of the direct current conversion circuit is connected with the direct current bus.

[0009] The driving module is connected with the direct current bus, the control module is connected with the direct current conversion circuit and the driving module respectively, the control module is used to control the direct current conversion circuit to convert first direct current output by the battery into second direct current output, and is used to control the driving module to convert the second direct current or third direct current output by the rectifier circuit into driving voltage output of a load.

[0010] Optionally, the DC bus module further includes a bus support capacitor connected to the DC bus and an AC pre-charging circuit provided on the DC bus, the output end of the DC conversion circuit is connected to the DC bus between the output end of the AC pre-charging circuit and the bus support capacitor, and the output end of the rectifier circuit is connected to the input end of the AC pre-charging circuit; and / or;

[0011] The DC power supply module includes a DC pre-charging circuit, which is connected between the battery and the input end of the DC conversion circuit.

[0012] Optionally, the control module includes an auxiliary power supply circuit and an MCU;

[0013] The auxiliary power supply circuit is connected to the battery and is used to convert the first direct current into a fourth direct current to power the MCU;

[0014] The MCU is connected to the DC conversion circuit and the driving module respectively to output corresponding control signals to the DC conversion circuit and the driving module respectively.

[0015] Optionally, the control module further includes an input acquisition circuit connected to the MCU;

[0016] The input acquisition circuit is connected to the output terminals of the AC power supply and the battery respectively, and is used to respectively acquire the output voltages of the AC power supply and the battery and send them to the MCU.

[0017] Optionally, the DC conversion circuit is a push-pull boost conversion circuit.

[0018] According to a second aspect of an embodiment of the present application, there is provided an integrated control driver, comprising a first substrate, a second substrate, and a control driver circuit as described in any one of the above;

[0019] The DC power supply module and the control module are arranged on the first substrate, and the AC power supply module, the DC bus module and the drive module are arranged on the second substrate.

[0020] Optionally, the first substrate is spliced ​​onto the second substrate via pins, and the first substrate and the second substrate are fixedly connected via spacers.

[0021] Optionally, the integrated control driver further includes a heat sink;

[0022] The second substrate is assembled on the heat sink through spacer columns.

[0023] Optionally, the first substrate, the second substrate and the heat sink are stacked in sequence.

[0024] According to a third aspect of an embodiment of the present application, a ventilation system is provided, comprising any one of the control drive circuits described above or any one of the integrated control drivers described above;

[0025] The control drive circuit or the integrated control driver is connected to the fan in the ventilation system and is used to output a drive voltage to the fan.

[0026] As can be seen from the above, the control drive circuit provided by the present application connects the output ends of the DC conversion circuit in the DC power supply module and the rectifier circuit in the AC power supply module to the DC bus in the DC bus module respectively, and there is no need to set relays at the battery, AC power supply and DC bus end to switch between AC power supply and DC power supply, thereby avoiding or reducing power supply abnormality problems caused by relay failure during the switching process. In addition, the output ends of the rectifier circuit and the DC conversion circuit, which respectively have reverse cutoff characteristics, are connected in parallel to the DC bus, which will not cause current backflow, and can perform hot switching between AC and DC power, thereby ensuring the reliability of the operation of the system where the load is located. The integrated control driver and ventilation system provided by the present application can achieve the same beneficial effects as the control drive circuit provided by the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are only used to illustrate the embodiments and are not to be considered as limiting the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0028] Figure 1 A schematic diagram of the structure of a control drive circuit provided according to some embodiments of the present application;

[0029] Figure 2 Schematic diagram of components of an integrated control driver provided according to some embodiments of the present application;

[0030] Figure 3 A schematic diagram of an exploded structure of an integrated control driver provided according to some embodiments of the present application;

[0031] Figure 4 This is a schematic structural diagram of a ventilation system provided according to some embodiments of the present application. DETAILED DESCRIPTION

[0032] The technical solution of this application is further elaborated in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit the implementation of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] In the description of this application, unless otherwise specified, "plurality" means two or more. In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] See also Figure 1 , which is a schematic diagram of the structure of a control drive circuit provided according to some embodiments of the present application. In some embodiments, the control drive circuit 1 provided by the present application is used to power a load 2. Load 2 can be, but is not limited to, a fan in a ventilation system. The ventilation system can be, but is not limited to, an air conditioning system. The control drive circuit 1 provided by the embodiment of the present application includes a DC bus module 11, an AC power supply module 12, a DC power supply module 13, a drive module 14, and a control module 15.

[0036] The DC bus module 11 includes a DC bus 111, and the AC power supply module 12 includes a rectifier circuit 121 with reverse cutoff characteristics. The input end of the rectifier circuit 121 is connected to the AC power supply ( Figure 1 The DC power supply module 13 includes a DC conversion circuit 131 with reverse blocking characteristics. The input of the DC conversion circuit 131 is connected to the battery 3, and the output of the DC conversion circuit 131 is connected to the DC bus 111. The driver module 14 is connected to the DC bus 111. The control module 15 is connected to the DC conversion circuit 131 and the driver module 14, respectively. The control module 15 is configured to control the DC conversion circuit 131 to convert the first DC power VDC1 output by the battery 3 into the second DC power VDC2 for output, and to control the driver module 14 to convert the second DC power VDC2 or the third DC power VDC3 output by the rectifier circuit 121 into a driving voltage for the load 2. The rectifier circuit 121 is configured to convert the AC power VAC into the third DC power for output.

[0037] The DC bus module 11 is used to input the power provided by one of the AC power supply module 12 and the DC power supply module 13 into the drive module 14, so as to power the load 2 via the drive module 14. The rectifier circuit 121 in the AC power supply module 12 and the DC conversion circuit 131 in the DC power supply module 13 each have a reverse cutoff characteristic, and their output ends are commonly connected to the DC bus 111. When the input end of the rectifier circuit 121 receives normal AC power, the third DC power VDC3 output by the rectifier circuit 121 to the DC bus 111 is greater than the output end voltage of the DC conversion circuit 131. The DC conversion circuit 131 is in a reverse cutoff state and stops outputting the second DC power VDC2. The DC bus module 11 then outputs the rectifier circuit 121. The third DC power VDC3 is input to the driver module 14, and the load 2 is powered by the AC power supply. When an abnormal power outage occurs at the input of the rectifier circuit 121, the third DC power VDC3 output by the DC converter circuit 131 is greater than the voltage at the output of the rectifier circuit 121. The rectifier circuit 121 enters a reverse cutoff state and stops outputting the third DC power VDC3. The DC bus module 11 then inputs the third DC power VDC3 output by the DC converter circuit 131 to the driver module 14, and the load 2 is powered by the DC power output of the battery. The rectifier circuit 121 may include, but is not limited to, a diode bridge rectifier, and the DC converter circuit 131 may be, but is not limited to, a push-pull boost converter circuit.

[0038] The control drive circuit provided in the embodiment of the present application connects the output ends of the DC conversion circuit 131 in the DC power supply module 13 and the rectifier circuit 121 in the AC power supply module 12 to the DC bus in the DC bus module 11, respectively. This eliminates the need for relays between the battery, AC power source, and DC bus to switch between AC and DC power, thereby avoiding or reducing power supply anomalies caused by relay failure during the switching process. Furthermore, the output ends of the rectifier circuit 121 and the DC conversion circuit 131, each having reverse cutoff characteristics, are connected in parallel to the DC bus 111, preventing current backflow. This allows for hot switching between AC and DC power, ensuring the reliability of the system in which the load 2 resides.

[0039] Please continue reading Figure 1 As shown, in some embodiments, the DC bus module 11 further includes a bus support capacitor 112 connected to the DC bus 111 and an AC pre-charging circuit 113 provided on the DC bus 111. The output end of the DC conversion circuit 131 is connected to the DC bus 111 between the output end of the AC pre-charging circuit 113 and the bus support capacitor 112. The output end of the rectifier circuit 121 is connected to the input end of the AC pre-charging circuit 113. The third DC power VDC3 output by the rectifier circuit 121 pre-charges the bus support capacitor 112 via the AC pre-charging circuit 113 to reduce circuit impact and increase safety.

[0040] In some embodiments, to reduce circuit impact and increase safety, the DC power supply module 13 includes a DC pre-charging circuit 132. The DC pre-charging circuit 132 is connected between the battery 3 and the input terminal of the DC conversion circuit 131. Specifically, the DC pre-charging circuit 132 includes a current-limiting resistor connected to the power supply circuit of the battery 3 and a pre-charging switch connected in parallel with the current-limiting resistor.

[0041] Please continue reading Figure 1 As shown, the control module 15 includes an MCU 151 and an auxiliary power supply circuit 152. The auxiliary power supply circuit 152 is connected to the battery 3 and is configured to convert the first DC power VDC1 output by the battery 3 into a fourth DC power to power the MCU 151. The MCU 151 is connected to the DC conversion circuit 131 and the drive module 14, respectively, to output corresponding control signals to the DC conversion circuit 131 and the drive module 14, thereby controlling the DC conversion circuit 131 to convert the first DC power VDC1 into a second DC power VDC2 and output it to the DC bus 111 to power the load 2 when an abnormality occurs in the AC power supply module 12.

[0042] In some embodiments, the control module 15 further includes an input acquisition circuit ( Figure 1 (not shown), the input acquisition circuit is connected to the output ends of the AC power supply and the battery 3 respectively, and is used to collect the output voltages of the AC power supply and the battery respectively, and send the collected voltages to the MCU151, so that the MCU151 can monitor the AC voltage input by the AC power supply module 12 and the first DC power VDC1 input by the DC power supply module. When the AC voltage is detected to be less than the preset value, it means that the AC power supply is abnormal, and the DC conversion circuit 131 is controlled to convert the first DC power VDC1 into the second DC power VDC2 for output, so as to switch the power supply of the load 2 from the AC power supply to the battery, so as to achieve emergency power supply for the load 2 using the first DC power VDC1 output by the battery when the AC power supply output is abnormal, so as to maintain the normal operation of the load 2. When the MCU151 detects that the AC power supply is normal, the power supply of the load 2 is switched to the AC power supply. In order to reduce power consumption, the MCU151 can control the DC conversion circuit 131 to be in a stopped working state to stop outputting the second DC power VDC2.

[0043] See also Figure 2As shown, it is a schematic diagram of the structure of each component of the integrated control zone provided according to some embodiments of the present application. The integrated control driver provided in the embodiment of the present application includes a first substrate 10, a second substrate 20 and a control drive circuit 1 provided in accordance with any embodiment of the present application. Among them, the DC power supply module 13 and the control module 15 in the control drive circuit 1 are arranged on the first substrate 10, and the AC power supply module 12, the DC bus module 11 and the drive module 14 are arranged on the second substrate 20. The integrated control driver provided in the embodiment of the present application and the control drive circuit provided in the embodiment of the present application can achieve the same technical effect, and will not be repeated here.

[0044] In some embodiments, to reduce the space occupied by the integrated control driver, the first substrate 10 is spliced ​​to the second substrate 20 via pins. The first substrate 10 can be a control board, and the second substrate 20 can be a power board. Furthermore, the first and second substrates 10, 20 are fixedly connected via spacers. The spacers serve as a strong electrical conductor between the first and second substrates 10, 20, stabilizing the structure and acting as conductors. This reduces the space occupied by the integrated control driver and facilitates its installation on the train.

[0045] Please continue reading Figure 2 As shown, the integrated control driver provided in some embodiments of the present application further includes a heat sink 30 , and the second substrate 20 is assembled on the heat sink 30 through spacer columns to further increase the space utilization of the integrated drive controller.

[0046] See also Figure 3 , which is a schematic diagram of an exploded structure of an integrated control driver provided according to some embodiments of the present application. In some embodiments, to effectively reduce the installation space required for the integrated control driver, the first substrate 10, the second substrate 20, and the heat sink 30 are stacked in sequence, i.e., the second substrate 20 is assembled on the heat sink 30, and the first substrate 10 is stacked on the other side of the first substrate 10 away from the heat sink 30.

[0047] The first substrate 10 is provided with a DC power input terminal P1, which is used to connect to the battery 3. The second substrate 20 is provided with an AC power input terminal P2 and a drive output terminal P3. In the event of an abnormality in the AC power supply connected to the AC power input terminal P2, the DC power input terminal P1 receives the first DC power VDC1 output by the battery 3 to provide emergency power to the load 2. In the event of a normal AC power supply connected to the AC power input terminal P2, the AC power input terminal P2 receives the AC power to power the load 2, and the drive output terminal P3 outputs a drive voltage to the load to drive the load 2 to operate. In addition, the first substrate 10 is also provided with an auxiliary power input terminal P4, which receives the 110V DC power output by the battery 3 to power the MCU 151.

[0048] See also Figure 4 As shown, it is a structural diagram of a ventilation system provided according to some embodiments of the present application. The ventilation system provided in the embodiment of the present application can be, but is not limited to, installed on a train for ventilation, and includes a load 2 and an integrated control driver 1' provided in any embodiment of the present application. The integrated control driver 1' is connected to the load 2 and is used to output a driving voltage to the load 2. The load 2 is a fan in the ventilation system, and the drive output terminal P3 of the integrated control driver is connected to the load 2 for outputting a driving voltage to power the load. The ventilation system provided in the embodiment of the present application and the integrated control driver provided in the embodiment of the present application can achieve the same technical effect, which will not be repeated here.

[0049] The specific ventilation system also includes a battery 3 and an AC power module, wherein the AC power module includes a pantograph 5 and an inverter 4 for converting the high-voltage DC voltage output by the pantograph into AC power. The output of the inverter 4 is connected to the AC power input P2 of the integrated control driver. The integrated control driver 1 also includes an auxiliary power input P4 connected to the battery 3. The auxiliary power input P4 is connected to the input of the auxiliary power circuit 152. The auxiliary power circuit 152 is always connected to the battery 3 based on the auxiliary power input P4 to output the power supply voltage to the MCU 151.

[0050] In other embodiments, the ventilation system provided by the present application may also include a control drive circuit 1 and a load 2 provided according to any embodiment of the present application. The control drive circuit 1 is connected to the AC power supply and the battery 3, respectively, and is used to convert the AC power output by the AC power supply into a driving voltage of the load 2 to power the load 2 when the AC power supply is normal. When the AC power supply is abnormal, the first DC power VDC1 output by the battery 3 is converted into a driving voltage of the load 2 to provide emergency power supply to the load 2, thereby realizing emergency ventilation of the ventilation system.

[0051] Please continue reading Figure 2 and Figure 3As shown, the integrated control driver provided in the embodiment of the present application integrates AC power supply, DC power supply and control drive into one, and can be used in the ventilation system installed on the train, so that there is no need to specially prepare a separate DC voltage converter on the train, and the integrated control driver can also be directly used as a driver, which has high flexibility of use.

[0052] This allows the ventilation system to be used in both normal and emergency ventilation conditions. Specifically, in normal ventilation conditions, the AC power input terminal P2 on the second substrate 20 receives 380V AC power to power the load 2, and the drive output terminal P3 on the second substrate 20 outputs the drive voltage to the load 2. In emergency ventilation conditions, the DC power input terminal P1 on the first substrate 10 receives 110V DC power from the battery 3 to power the load 2, and the drive output terminal P3 on the second substrate 20 still outputs the drive voltage to the load 2.

[0053] In order to further describe in detail the beneficial effects of the ventilation system provided by the embodiment of the present application, the ventilation system provided by the embodiment of the present application is further described in detail by taking the application of the ventilation system to a train as an example.

[0054] The train's battery 3 outputs 110V DC power, which is then transmitted via a high-voltage cable through a pantograph 5 and converted to 380V AC power by an inverter 4. This 110V DC power is supplied to the integrated control driver's DC power input terminal P1 and the auxiliary power input terminal P4, which requires a permanent power supply.

[0055] In addition, in some embodiments, the DC conversion circuit 131 is a push-pull boost conversion circuit. During use, 380V AC and 110V DC are input for a long time, and the push-pull boost module can be always on. In some embodiments, when 380V AC is input at the AC power supply input terminal P2, the voltage of the DC bus 111 is higher than the output voltage of the push-pull boost conversion circuit. The push-pull boost conversion circuit is reversely cut off due to device characteristics and stops outputting. The ventilation system is powered by 380V AC. When there is no input at the AC power supply input terminal P2 380V, the DC bus voltage drops, the output voltage of the push-pull boost conversion circuit is higher than the DC bus voltage, the rectifier circuit 121 is reversely cut off due to device characteristics, and the ventilation system is powered by 110V DC, thereby achieving hot switching between main and standby power.

[0056] In some embodiments, the control logic of MCU151 can be modified so that the push-pull boost converter circuit is turned on after MCU151 recognizes that the 380 AC power input at the AC power input terminal P2 is abnormal, thereby changing the power supply mode of load 2 from AC power supply to DC power supply.

[0057] Furthermore, the push-pull boost converter circuit can be set to a normally closed state by configuring software parameters. In this case, the integrated control driver can function as a standard AC inverter. In other embodiments, the push-pull boost converter circuit can be set to a normally open state. If the AC power input terminal P2 is never connected to 380V AC, the integrated control driver can also function directly as a DC inverter.

[0058] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A control drive circuit, characterized in that: It includes DC bus module, AC power supply module, DC power supply module, drive module and control module; The DC bus module includes a DC bus; The AC power supply module includes a rectifier circuit with a reverse cutoff characteristic, the input end of the rectifier circuit is connected to the AC power supply, and the output end of the rectifier circuit is connected to the DC bus; The DC power supply module includes a DC conversion circuit with a reverse cutoff characteristic, the input end of the DC conversion circuit is connected to the battery, and the output end of the DC conversion circuit is connected to the DC bus; The drive module is connected to the DC bus, and the control module is connected to the DC conversion circuit and the drive module respectively. The control module is used to control the DC conversion circuit to convert the first DC power output by the battery into a second DC power output, and to control the drive module to convert the second DC power or the third DC power output by the rectifier circuit into a drive voltage output for the load.

2. The control drive circuit according to claim 1, wherein: The DC bus module further includes a bus support capacitor connected to the DC bus and an AC pre-charging circuit provided on the DC bus, the output end of the DC conversion circuit is connected to the DC bus between the output end of the AC pre-charging circuit and the bus support capacitor, and the output end of the rectifier circuit is connected to the input end of the AC pre-charging circuit; and / or; The DC power supply module includes a DC pre-charging circuit, which is connected between the battery and the input end of the DC conversion circuit.

3. The control drive circuit according to claim 1, wherein: The control module includes an auxiliary power supply circuit and an MCU; The auxiliary power supply circuit is connected to the battery and is used to convert the first direct current into a fourth direct current to power the MCU; The MCU is connected to the DC conversion circuit and the driving module respectively to output corresponding control signals to the DC conversion circuit and the driving module respectively.

4. The control drive circuit according to claim 3, characterized in that: The control module also includes an input acquisition circuit connected to the MCU; The input acquisition circuit is connected to the output terminals of the AC power supply and the battery respectively, and is used to respectively acquire the output voltages of the AC power supply and the battery and send them to the MCU.

5. The control drive circuit according to any one of claims 1 to 4, characterized in that: The DC conversion circuit is a push-pull boost conversion circuit.

6. An integrated control driver, characterized in that: comprising a first substrate, a second substrate and the control drive circuit according to any one of claims 1 to 5; The DC power supply module and the control module are arranged on the first substrate, and the AC power supply module, the DC bus module and the drive module are arranged on the second substrate.

7. The integrated control driver according to claim 6, characterized in that: The first substrate is spliced ​​on the second substrate through pins, and the first substrate and the second substrate are fixedly connected through spacers.

8. The integrated control driver according to claim 6 or 7, characterized in that: Also includes radiator; The second substrate is assembled on the heat sink through spacer columns.

9. The integrated control driver according to claim 8, characterized in that: The first substrate, the second substrate and the heat sink are stacked in sequence.

10. A ventilation system, characterized in that: A control drive circuit comprising any one of claims 1 to 5 or an integrated control driver according to any one of claims 6 to 9; The control drive circuit or the integrated control driver is connected to the fan in the ventilation system and is used to output a drive voltage to the fan.

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