CN210047338U - Active weak current side discharge circuit - Google Patents
Active weak current side discharge circuit Download PDFInfo
- Publication number
- CN210047338U CN210047338U CN201920752643.XU CN201920752643U CN210047338U CN 210047338 U CN210047338 U CN 210047338U CN 201920752643 U CN201920752643 U CN 201920752643U CN 210047338 U CN210047338 U CN 210047338U
- Authority
- CN
- China
- Prior art keywords
- discharge
- controllable switch
- processing chip
- weak current
- driving unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Protection Of Static Devices (AREA)
- Inverter Devices (AREA)
Abstract
The utility model provides a weak current side discharge circuit of initiative belongs to car machine controller technical field. The method solves the problem of how to realize safe and stable active discharge. The active weak current side discharge circuit comprises a discharge power supply, a fault detection module, a driving unit, a controllable switch and a processing chip, wherein the fault detection module is connected with the processing chip, the processing chip is connected with a control end of the controllable switch through the driving unit, the active weak current side discharge circuit further comprises a transformer and a discharge resistor connected with the low-voltage side of the transformer, the discharge resistor is further connected with the input end of the controllable switch, and the high-voltage side of the transformer is connected with the discharge power supply. The transformer is arranged between the discharge power supply and the discharge resistor, so that the high voltage of the discharge power supply is reduced to low voltage, the processing chip, the controllable switch and the discharge resistor work on the weak voltage side, and the safe and stable active weak current side discharge function is realized.
Description
Technical Field
The utility model belongs to the technical field of car machine controller, a weak current side discharge circuit of initiative is related to.
Background
In order to guarantee personal safety, in a control unit of an electric drive system, the bus voltage is required to be reduced to a safe voltage range within 2S after a controller is powered off, and the voltage can be controlled under the condition that the controller is not damaged under the bus overvoltage working condition caused by the high-speed running and out-of-control condition of a motor, so that active discharging is required under the two working conditions. When a processor of the electric drive controller receives a lower electric signal issued by the whole vehicle or the processor receives an overvoltage signal caused by high rotating speed of the motor, after the condition that the discharging condition is met is judged, the insulated gate bipolar transistor (IGBT for short) switch is controlled by software to discharge in a motor winding mode. And when the motor winding cannot meet the discharge condition, enabling the discharge loop of the internal resistor to carry out active discharge.
Chinese patent document discloses an active discharge control circuit and an automobile with application number 201810940555.2. The charging control sub-circuit is used for receiving a discharging signal through an input end of the charging control sub-circuit and providing a charging signal for the input end of the energy storage sub-circuit through the output end after receiving the discharging signal so as to charge the energy storage sub-circuit, thereby improving the voltage of the output end of the energy storage sub-circuit; the discharge control sub-circuit is connected with the output end of the energy storage sub-circuit and is used for outputting a discharge control signal to the discharge sub-circuit after the voltage of the output end of the energy storage sub-circuit is greater than a preset reference voltage; the discharge sub-circuit is used for controlling the device to be discharged to discharge after receiving the discharge control signal. The method can realize the hardware delay discharge protection and can avoid the hardware burning caused by the error of software control, thereby improving the safety. However, the patent and the traditional active discharge mode have the following defects: 1. the high-voltage side discharge resistor is easy to lose efficacy and has low safety; 2. high side discharge is very costly both in terms of resistive performance requirements and related functional costs.
Disclosure of Invention
The utility model discloses to the problem that prior art exists, provide an initiative weak current side discharge circuit, how this circuit has solved the problem that how to realize the safety and stability initiative is discharged.
The utility model discloses a following technical scheme realizes:
the utility model provides an initiative weak current side discharge circuit, includes discharge power supply, fault detection module, drive unit, controllable switch and processing chip, and fault detection module connects processing chip, and processing chip passes through drive unit and connects controllable switch's control end, its characterized in that still includes the transformer and connects the discharge resistance of transformer low pressure side, discharge resistance still connects controllable switch input, and discharge power supply is connected to the high-pressure side of transformer.
After the processing chip receives a full-vehicle lower electric signal issued by a full vehicle or receives an overvoltage signal caused by high rotating speed of a motor according to a detection fault signal of the fault detection module, the processing chip controls the controllable switch to be switched on through the driving unit after judging that a discharging condition is met, the discharging power supply, the transformer, the discharging resistor, the controllable switch and the ground form a closed circuit, and the discharging resistor actively discharges at the low-voltage side of the voltage device. The high-voltage side energy of the discharge power supply is converted into low-voltage energy on the weak current side through the transformer, discharge is carried out on the weak current side through the discharge resistor, an active weak current side discharge circuit is formed, the weak current side is safer relative to the high-voltage side, and even if misoperation or failure occurs, the safety problem cannot be caused. Meanwhile, the requirement on the insulation performance of the resistor working in a low-voltage environment at a weak current side is low, the cost of low-voltage insulation materials and heat conduction materials is low, and the implementation mode is simple and reliable; the active weak current side discharge circuit performs resistance discharge in a low-voltage area after voltage reduction through the transformer, and the transformer is an isolation type energy transmission device and is safer and more stable.
In the active weak current side discharge circuit, the processing chip is further connected with a first temperature sensor for detecting a controllable switch temperature signal and a second temperature sensor for detecting a discharge resistance temperature signal, and the processing chip stops or adjusts discharge control when the detected temperature exceeds a set value. And respectively monitoring the temperature conditions of the controllable switch and the discharge resistor by using the first temperature sensor and the second temperature sensor, namely monitoring the working condition of the discharge element. When the temperature of the discharge resistor or the controllable switch exceeds the standard, the discharge circuit can be effectively protected even if the discharge is adjusted or stopped, so that safer and more stable active discharge is realized.
In the active weak current side discharge circuit, a sampling resistor is connected between the output end of the controllable switch and the ground wire, and the output end of the controllable switch is also connected with a processing chip. The sampling current is used for collecting the current flowing through the discharge resistor, converting the sampling current into a voltage signal and sending the voltage signal to the processing chip, so that the discharge state of the controllable switch and the discharge resistor is monitored, and meanwhile, the processing chip can diagnose whether the power failure occurs or not according to the state, and further the safety and stability of the discharge and the power failure are enhanced.
In the active weak current side discharge circuit, the processing chip is connected with the driving unit in a bidirectional manner, the processing chip sends an enable signal to control the driving unit, and meanwhile, a fault signal of the driving unit is fed back and transmitted back to the processing chip. The processing chip not only realizes active discharge through the driving unit, but also monitors the fault signal of the driving unit, carries out fault monitoring on the driving unit, ensures that the driving unit can process in time when in fault, and further ensures effective discharge of the discharge circuit.
In the active weak current side discharge circuit, a driving resistor is further connected between the driving unit and the control end of the controllable switch, and the driving unit is an integrated power amplification circuit. The size of the driving resistor influences the switching time, the switching loss, the reverse bias safety working area and the short circuit safety working area of the controllable switch, and the reasonable control of the controllable switch is realized through the driving unit and the driving resistor, so that the discharging circuit is more stable.
In the active weak current side discharge circuit, the controllable switch is one of the following components with switch functions: IGBT, MOS tube, triode or relay. Any controllable component with a switching function can be selected to stably realize active discharge control.
In the above active weak side discharging circuit, the processing chip is an integrated chip with a logic function or a combination of a plurality of integrated chips. The processing chip is a logic processing function integrated chip, can meet the requirement of transmitting fault information of the whole vehicle controller and can accurately realize active discharge control.
Compared with the prior art, the active weak current side discharge circuit has the following advantages:
1. the utility model discloses a set up the transformer between discharge power and discharge resistance, reduce discharge power's high-tension electricity to the low-tension electricity for processing chip, controllable switch and discharge resistance all work in the weak voltage side, realize the initiative weak current side discharge function of safety and stability.
2. This practicality is through temperature sensor one, temperature sensor two, sampling resistance's sampling signal and drive unit's fault feedback signal, carries out the orientation control to discharge circuit for this weak current side discharge circuit performance of initiative is more stable.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
In the figure, 1, a discharge power supply; 2. a fault detection module; UC, processing chip; r1, a sampling resistor; r2, discharge resistance; r3, drive resistor; D. a drive unit; q1, a controllable switch; t, a transformer; c1, a discharge capacitor; k1, power switch; G. and (4) a storage battery.
Detailed Description
The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, the active weak side discharging circuit includes a discharging power supply 1, a fault detection module 2, a driving unit D, a controllable switch Q1, and a processing chip UC, where the fault detection module 2 is connected to the processing chip UC, the processing chip UC is connected to a control terminal of the controllable switch Q1 through the driving unit D, the active weak side discharging circuit further includes a transformer T and a discharging resistor R2 connected to a low-voltage side of the transformer T, the discharging resistor R2 is further connected to an input terminal of the controllable switch Q1, and a high-voltage side of the transformer T is connected to the discharging power supply 1. The fault detection module 2 is arranged in the vehicle control unit, and the vehicle control unit sends a fault signal and power-off information to the processing chip UC. The vehicle control unit is directly connected with the processing chip UC, and does not need to add components to provide a diagnosis basis for discharge control for the processing chip UC. The processing chip UC is connected with the driving unit D in a bidirectional manner, the processing chip UC sends an enable signal to control the driving unit D, and meanwhile, a fault signal of the driving unit D is fed back and transmitted to the processing chip UC. The processing chip UC not only realizes active discharge through the driving unit D, but also monitors a fault signal of the driving unit D, and performs fault monitoring on the driving unit D, so as to ensure that the driving unit D can perform processing in time when a fault occurs, and further ensure effective discharge of the discharge circuit. The discharging power supply 1 is formed by connecting a storage battery G, a power switch K1 and a discharging capacitor C1 in series, and the high-voltage side of the transformer T is connected with the discharging capacitor C1 in parallel. When the power switch K1 is turned on, the storage battery G is powered off, and the discharging capacitor C1 discharges. At this time, the transformer T reduces the high voltage discharged by the discharge capacitor C1 to form a low voltage, the processing chip UC controls the controllable switch Q1 to be turned on, and the low voltage output by the low voltage side of the transformer T is actively discharged by the discharge resistor R2. The processing chip UC is also connected to a temperature sensor TD1 for detecting the temperature signal of the controllable switch Q1 and a temperature sensor TD2 for detecting the temperature signal of the discharge resistor R2, and when the detected temperature exceeds a set value, the processing chip UC stops or adjusts the discharge control. The temperature conditions of the controllable switch Q1 and the discharge resistor R2 are respectively monitored by a first temperature sensor TD1 and a second temperature sensor TD2, namely the working conditions of the discharge components are monitored. When the temperature of the discharge resistor R2 or the controllable switch Q1 exceeds the standard, the discharge circuit can be effectively protected even if the discharge is adjusted or stopped, so that safer and more stable active discharge is realized.
A sampling resistor R1 is connected between the output end of the controllable switch Q1 and the ground wire, and the output end of the controllable switch Q1 is also connected with a processing chip UC. The sampling current is used for collecting the current flowing through the discharge resistor R2, and converting the sampling current into a voltage signal to be sent to the processing chip UC, so as to monitor the discharge state of the controllable switch Q1 and the discharge resistor R2, and meanwhile, the processing chip UC can diagnose whether the power failure occurs or not according to the state, thereby further enhancing the safety and stability of the discharge and the power failure.
And a driving resistor R3 is also connected between the driving unit D and the control end of the controllable switch Q1, and the driving unit D is an integrated power amplifying circuit. The size of the driving resistor R3 influences the switching time, the switching loss, the reverse bias safe working area and the short-circuit safe working area of the controllable switch Q1, and reasonable control over the switching state of the controllable switch Q1 is achieved through the driving unit D and the driving resistor R3, so that the discharging circuit is more stable.
The controllable switch Q1 is one of the following components with switching functions: an igbt (insulated Gate bipolar transistor), a MOS transistor (metal oxide semiconductor field effect transistor), a triode, or a relay. Fig. 1 illustrates a connection structure of an IGBT, in which a control terminal is a gate of the IGBT, the gate is connected to a driving resistor R3, an emitter is connected to a discharging resistor R2 in series, and a collector is connected to a sampling resistor R1 in series. Any controllable component with a switching function can be selected to stably realize active discharge control. The processing chip UC is an integrated chip with a logic function or a combination of multiple integrated chips with a logic function. The further processing chip UC can be implemented by a single chip, and the combination of a plurality of integrated chips with logic functions can be a vehicle controller. The processing chip UC is a logic processing function integrated chip, and can meet the requirement of transmitting fault information of the vehicle controller and accurately implement active discharge control.
The working principle of the active weak-current side discharge circuit is as follows:
after the processing chip UC detects a fault signal according to the fault detection module 2, when the processing chip UC of the electric drive controller receives an electric signal under the entire vehicle issued by the entire vehicle or the processor receives an overvoltage signal caused by a high rotation speed of the motor, and it is determined that a discharge condition is satisfied, the processing chip UC controls the controllable switch Q1 to be turned on through the driving unit D, the discharge power supply 1, the transformer T, the discharge resistor R2, the controllable switch Q1 and the ground form a closed circuit, and at this time, the discharge resistor R2 actively discharges on the low-voltage side of the voltage regulator. The transformer T is a step-down transformer T that steps down the high voltage of the discharge power supply 1 to the lower side and outputs the voltage to the discharge resistor R2. In fig. 1, HV represents a high-pressure side, and LV represents a low-pressure side. The high-voltage side energy of the discharge power supply 1 is converted into low-voltage energy on the weak current side through the transformer T, and the discharge is performed on the weak current side through the discharge resistor R2, so that an active weak current side discharge circuit is formed, the weak current side is safer relative to the high-voltage side, and the safety problem can not be caused even if misoperation or failure occurs. Meanwhile, the requirement on the insulation performance of the resistor working in a low-voltage environment at a weak current side is low, the cost of low-voltage insulation materials and heat conduction materials is low, and the implementation mode is simple and reliable; the active weak current side discharge circuit performs resistance discharge in a low-voltage area after voltage reduction through the transformer T, and the transformer T is an isolation type energy transmission device and is safer and more stable. Meanwhile, the processing chip UC receives a temperature sampling signal of the temperature sensor TD1 to the controllable switch Q1, a temperature sampling signal of the temperature sensor TD2 to the discharge resistor R2, a current sampling signal of the sampling resistor R1 to the discharge resistor R2, and a fault signal of the driving unit D. The processing chip UC monitors the sampling signal and the fault signal to adjust the discharge time or stop discharging. And simultaneously, whether the power failure is effective or not is monitored. The multiple protection circuits can be more stable in control and realize the active discharge function.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (7)
1. The utility model provides an initiative weak current side discharge circuit, includes discharge power supply (1), fault detection module (2), drive unit (D), controllable switch (Q1) and handles chip (UC), fault detection module (2) are connected and are handled chip (UC), handle chip (UC) and pass through drive unit (D) and connect the control end of controllable switch (Q1), its characterized in that, still include transformer (T) and discharge resistance (R2) of connecting transformer (T) low pressure side, controllable switch (Q1) input is still connected to discharge resistance (R2), discharge power supply (1) is connected to the high-pressure side of transformer (T).
2. The active weak side discharge circuit according to claim 1, characterized in that said processing chip (UC) is further connected with a first temperature sensor for detecting the temperature signal of the controllable switch (Q1) and a second temperature sensor for detecting the temperature signal of the discharge resistor (R2), the processing chip (UC) stopping or adjusting the discharge control when the detected temperature exceeds a set value.
3. Active weak side discharge circuit according to claim 1 or 2, characterized in that a sampling resistor (R1) is connected between the output of said controllable switch (Q1) and ground, and the output of said controllable switch (Q1) is further connected to a processing chip (UC).
4. The active weak current side discharge circuit according to claim 3, wherein the processing chip (UC) is connected with the driving unit (D) in two directions, the processing chip (UC) sends an enable signal to control the driving unit (D), and meanwhile, the fault signal of the driving unit (D) is fed back and transmitted to the processing chip (UC).
5. The active weak current side discharge circuit according to claim 4, wherein a driving resistor (R3) is further connected between the driving unit (D) and the control end of the controllable switch (Q1), and the driving unit (D) is an integrated power amplifying circuit.
6. The active weak side discharge circuit of claim 5, wherein said controllable switch (Q1) is one of the following components with switching function: IGBT, MOS tube, triode or relay.
7. The active weak current side discharge circuit of claim 1, wherein said processing chip (UC) is an integrated chip with logic function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920752643.XU CN210047338U (en) | 2019-05-23 | 2019-05-23 | Active weak current side discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920752643.XU CN210047338U (en) | 2019-05-23 | 2019-05-23 | Active weak current side discharge circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210047338U true CN210047338U (en) | 2020-02-11 |
Family
ID=69395826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920752643.XU Active CN210047338U (en) | 2019-05-23 | 2019-05-23 | Active weak current side discharge circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210047338U (en) |
-
2019
- 2019-05-23 CN CN201920752643.XU patent/CN210047338U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108565839A (en) | A kind of IGBT drive circuit and electric machine controller of electric machine controller | |
| US11121542B2 (en) | Protection coordination technique for power converters | |
| CN105471309A (en) | Inverter control apparatus, power conversion apparatus, and electric vehicle | |
| CN103303159B (en) | Electric vehicle controller and Dual Drive control method thereof | |
| CN109510176A (en) | A kind of intelligent power module Drive Protecting Circuit | |
| CN210047338U (en) | Active weak current side discharge circuit | |
| CN113514762A (en) | System for detecting state of APF/SVG relay | |
| CN112510742A (en) | High voltage ride through module of energy storage system and control method thereof | |
| CN209001614U (en) | A kind of charging control circuit of charger | |
| CN108471231B (en) | Absorption device for absorbing back electromotive force | |
| CN216774737U (en) | Semiconductor device short-circuit protection circuit | |
| CN115395478A (en) | Protection circuit of robot power supply system | |
| CN211924440U (en) | Dual-control system applied to air conditioner compressor | |
| CN212380935U (en) | Brake resistor protection circuit and frequency converter | |
| EP3820034A1 (en) | Current limiting circuit | |
| CN210074752U (en) | IGBT driving system and vehicle | |
| WO2021000253A1 (en) | Photovoltaic system and control method thereof | |
| CN204936865U (en) | A kind of electri forklift drive system | |
| CN110556788A (en) | Protection method of synchronous buck conversion circuit and novel synchronous buck conversion circuit | |
| CN110460021A (en) | A kind of IGBT protection circuit and air conditioner | |
| CN209389688U (en) | Short-circuit protection and converting means | |
| CN216390952U (en) | IGBT active clamping device | |
| CN213585568U (en) | Current limiter and power system | |
| CN213151639U (en) | Short-circuit protection circuit and system of inverter output H-bridge IGBT | |
| CN218352197U (en) | Battery parallel operation current equalizing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |