An integrated power load electronic switch

Abstract

The utility model discloses an integrated power load electronic switch, including: a power bus input terminal, used to input an electrical signal to a switch control module; a switch control module, used to control the on and off of the circuit at the load terminal of the power bus according to the electrical signal; an auxiliary power supply, used to provide a 5V power supply to the switch control module for power supply; a pre-charge switch control element, used to pre-charge the switch control module under preset conditions; a main power switch control element, used to energize the switch control module. The utility model avoids the existence of a large surge current at the moment of switch conduction, thereby generating a strong electromagnetic disturbance and voltage shock, and has better electromagnetic compatibility than high-power relays or contactors. In addition, there is no mechanical contact structure, and there will be no problems of contact adhesion and service life of relays or contactors, which is more reliable; it occupies a smaller volume space than relays or contactors of the same power.

Description

Technical Field

[0001] The utility model relates to the field of power electronic technology engineering, in particular to an integrated power load electronic switch. Background Art

[0002] Load electronic switches are widely used in power electronics, new energy, industrial control and other fields. In traditional engineering applications, high-power load electronic switches are often implemented using relays or contactors, and drive control signals are used to turn on and off the relays or contactors. However, when the relays or contactors are switched on and off, they are often accompanied by the live switching of mechanical contacts, which generates strong electromagnetic disturbances and voltage shocks. In addition, the on-off life of relays or contactors is also limited, and long-term use may cause contact adhesion problems. The use of traditional relays or contactors in power on-off electronic systems will reduce the electromagnetic compatibility and reliability of the system. Utility Model Content

[0003] In view of this, an embodiment of the utility model provides an integrated power load electronic switch, which solves the problems of electromagnetic disturbance and contact adhesion associated with relays or contactors as electronic switches in the prior art.

[0004] According to the first aspect, the embodiment of the utility model provides an integrated power load electronic switch, including: a switch control module, a power bus load end, a power bus input end, an auxiliary power supply, a pre-charge switch control element, and a main power switch control element, wherein:

[0005] The power bus input terminal is used to input an electrical signal to the switch control module;

[0006] The switch control module is used to control the on / off of the circuit at the load end of the power bus according to the electrical signal;

[0007] The auxiliary power supply is used to provide a 5V power supply to the switch control module for power supply;

[0008] The pre-charging switch control element is used to pre-charge the switch control module under preset conditions;

[0009] The main power switch control element is used to power on the switch control module.

[0010] The integrated power load electronic switch provided in this embodiment avoids the large surge current at the moment of switch on, thereby generating strong electromagnetic disturbance and voltage shock, and has better electromagnetic compatibility than high-power relays or contactors. In addition, it has no mechanical contact structure, and there will be no problems of contact adhesion and service life of relays or contactors, which is more reliable; it occupies a smaller volume space than relays or contactors of the same power.

[0011] In combination with the first aspect, in the first embodiment of the first aspect, the switch control module includes: a bus on-off switch, a pre-charging switch, a current limiting pre-charging switch circuit, a switch tube isolation drive optocoupler, a pre-charging switch tube isolation drive optocoupler, and a suspended drive isolation power supply.

[0012] In combination with the first embodiment of the first aspect, in the second embodiment of the first aspect, the suspension drive isolation power supply is a DCDC converter.

[0013] In combination with the first embodiment of the first aspect, in a third embodiment of the first aspect, the bus on-off switch is an IGBT switch.

[0014] In combination with the first embodiment of the first aspect, in a fourth embodiment of the first aspect, the pre-charging switch is an NMOS switch.

[0015] The integrated power load electronic switch provided by the embodiment of the utility model avoids the large surge current at the moment of switch on, thereby generating strong electromagnetic disturbance and voltage shock, and has better electromagnetic compatibility than high-power relays or contactors. In addition, there is no mechanical contact structure, and there will be no problems of contact adhesion and service life of relays or contactors, which is more reliable; it occupies a smaller volume space than relays or contactors of the same power; and the internal components are 100% domestically produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a schematic diagram of an integrated power load electronic switch according to an embodiment of the utility model;

[0018] Figure 2 It is a typical circuit application schematic diagram according to a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0020] In this embodiment, an integrated power load electronic switch is also provided. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0021] The utility model discloses an integrated power load electronic switch, such as Figure 1 As shown, it includes: a switch control module, a power bus load end 8 (power bus load end), a power bus input end 7 (power bus input), an auxiliary power supply 11 (5V auxiliary power supply), a pre-charge switch control element 9 (pre-charge switch control), and a main power switch control element 10 (main power switch control), wherein the power bus input end is used to input an electrical signal to the switch control module; the switch control module is used to control the circuit on and off of the power bus load end according to the electrical signal; the auxiliary power supply is used to provide a 5V power supply for the switch control module for power supply; the pre-charge switch control element is used to pre-charge the switch control module under the preset conditions; the main power switch control element is used to power on the switch control module. Specifically, the switch control module includes: a bus on-off switch 1, a pre-charge switch 2, a current limiting pre-charge switch circuit 3, a switch tube isolation drive optical coupler 5, a pre-charge switch tube isolation drive optical coupler 4, and a suspension drive isolation power supply 6. The suspension drive isolation power supply is a DCDC converter. The bus on-off switch is an IGBT switch. The pre-charge switch is an N MOS switch.

[0022] In this embodiment, all the discrete components of the integrated electronic switch are 100% domestically produced. Considering the derating design, the power bus switch IGBT needs to be able to withstand 1200V high voltage and 60A current continuous working capacity. Considering the high-voltage application scenario, a current limiting pre-charging switch circuit is required to avoid the instantaneous formation of a high-voltage potential difference across the load capacitor after the main IGBT is turned on, so that the load capacitor is violently charged under the condition of no current limiting and generates a huge current surge, thereby damaging the main IGBT. Considering the simplicity of control and electrical safety, the switch drive adopts TTL level, and the control stage is electrically isolated from the power bus, the isolation voltage is greater than 1KV, and the input stage is generally implemented with an optocoupler element. When the electronic switch is turned on, a driving power supply 15V higher than the bus voltage is required to provide a suspended 15V voltage of the reference bus for the IGBT B class. Therefore, it is necessary to design an isolated DCDC to provide this power supply, and the reference ground is the E class of the IGBT after the main switch. An external 5V auxiliary power supply is required to power the isolated DCDC inside the electronic switch to generate a 15V driving power supply. In this way, the external 5V auxiliary power supply is completely electrically isolated from the power reference ground to ensure electrical safety.

[0023] The integrated power load electronic switch provided in this embodiment avoids the large surge current at the moment of switch on, thereby generating strong electromagnetic disturbance and voltage shock, and has better electromagnetic compatibility than high-power relays or contactors. In addition, there is no mechanical contact structure, and there will be no problems of relay or contactor contact adhesion and service life, which is more reliable; it occupies a smaller volume space than relays or contactors of the same power; and the internal components are 100% domestically produced.

[0024] Specifically, the HD-ESW drawing number is the module model of the utility model. Figure 2 As shown, the module is used as a 500V power input switch. Pin 1 of the module is a 500V high voltage input; pins 2 and 3 are for main switch control and pre-charge control; pins 4 and 5 are 5V auxiliary power input; and pin 6 is the power load output. When the pre-charge switch is turned on, pin 6 of the module is connected to the 500V power input through the internal pre-charge MOS switch and the current limiting resistor to charge the downstream load capacitor EC1; when the main IGBT switch is turned on, pin 6 of the module is connected to the 500V power input through the internal main IGBT to continuously supply full power to the downstream load RL.

[0025] In practical applications, if this electronic switch is used in low-voltage (less than 100V) scenarios, no excessive surge current will be generated when the main IGBT is turned on, and the electronic switch does not need to be pre-charged, and the pre-charge control is cut off. The application method is similar to that of traditional relays or contactors. When the drive input is high, the main IGBT is turned on, and the power bus input stage and the load stage are turned on; when the drive input is low, the main IGBT is cut off, and the power bus input stage and the load stage are turned off. The working principle is as follows: When the drive input is high, the electronic switch drives the optocoupler to act effectively, the optocoupler transistor is turned on, and the 15V power supply is output to the IGBT B level. The IGBT B level is connected to the IGBT E level through a pull-down resistor, so at this time the IGBT B level reference E level voltage is +15V, which turns on the IGBT. When the drive input is low, the electronic switch drives the optocoupler to act invalidly, the optocoupler transistor is cut off, and the 15V power supply is disconnected from the IGBT B level. IGBT B level is connected to IGBT E level through a pull-down resistor, so at this time the IGBT B level reference E level voltage is 0V, thereby turning off the IGBT.

[0026] If the electronic switch is used in a high-voltage scenario, excessive surge current may be generated when the main IGBT is turned on, and the electronic switch must be pre-charged first. The working principle of pre-charging is: before turning on the main IGBT, control the pre-charge drive input to a high level, the pre-charge MOS is turned on, and the current-limiting resistor in series with the power bus input stage and the MOS tube switch back stage is turned on. The input power is charged for a short time by the pre-charge MOS and the current-limiting resistor for the large-capacity capacitor of the load level. Then let the main IGBT turn on. At this time, both ends of the large-capacity capacitor of the load level have been charged, so there is no high-voltage potential difference between the power bus input stage and the load level, and no large surge current will be generated at the moment the IGBT is turned on. After the short-time pre-charging is completed, the working principle is the same as the low-voltage working scenario.

[0027] The integrated power load electronic switch provided in this embodiment avoids the large surge current at the moment of switch on, thereby generating strong electromagnetic disturbance and voltage shock, and has better electromagnetic compatibility than high-power relays or contactors. In addition, there is no mechanical contact structure, and there will be no problems of relay or contactor contact adhesion and service life, which is more reliable; it occupies a smaller volume space than relays or contactors of the same power; and the internal components are 100% domestically produced.

Claims

1. An integrated power load electronic switch, characterized in that: include: Switch control module, power bus load end, power bus input end, auxiliary power supply, pre-charge switch control element, main power switch control element, wherein, The power bus input terminal is used to input an electrical signal to the switch control module; The switch control module is used to control the on / off of the circuit at the load end of the power supply bus of the power supply according to the electrical signal; The auxiliary power supply is used to provide a 5V power supply to the switch control module for power supply; The pre-charging switch control element is used to pre-charge the switch control module under preset conditions; The main power switch control element is used to power on the switch control module.

2. The integrated power load electronic switch according to claim 1, characterized in that: The switch control module includes: a bus on-off switch, a pre-charging switch, a current limiting pre-charging switch circuit, a switch tube isolation drive optocoupler, a pre-charging switch tube isolation drive optocoupler, and a suspension drive isolation power supply.

3. The integrated power load electronic switch according to claim 2, characterized in that: The suspension drive isolation power supply is a DCDC converter.

4. The integrated power load electronic switch according to claim 2, characterized in that: The busbar on-off switch is an IGBT switch.

5. The integrated power load electronic switch according to claim 2, characterized in that: The pre-charge switch is an NMOS switch.

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