CN211710757U - Discharge circuit, motor controller, vehicle-mounted charging device, and vehicle-mounted DC/DC device - Google Patents
Discharge circuit, motor controller, vehicle-mounted charging device, and vehicle-mounted DC/DC device Download PDFInfo
- Publication number
- CN211710757U CN211710757U CN201921488036.3U CN201921488036U CN211710757U CN 211710757 U CN211710757 U CN 211710757U CN 201921488036 U CN201921488036 U CN 201921488036U CN 211710757 U CN211710757 U CN 211710757U
- Authority
- CN
- China
- Prior art keywords
- resistor
- discharge
- type mos
- electrode
- npn
- 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
- Direct Current Feeding And Distribution (AREA)
Abstract
The utility model discloses a discharge circuit, it includes: the negative feedback constant current discharge unit is used for discharging the bus capacitor and is connected to two ends of the bus capacitor; and the control unit is used for controlling the negative feedback constant current discharge unit to execute discharge and is connected with the negative feedback constant current discharge unit. The utility model discloses be applied to in the new energy automobile, through implementing the embodiment of the utility model provides a, steerable discharge current size, it is fast to discharge, and is small, with low costs, and the reliability is high. In addition the utility model also discloses a machine controller, on-vehicle battery charging outfit and on-vehicle DC equipment, all include in machine controller, on-vehicle battery charging outfit and the on-vehicle DC equipment discharge circuit, through discharge circuit carries out the discharge to bus-bar electric capacity.
Description
Technical Field
The utility model relates to a new energy automobile field especially relates to a discharge circuit, machine controller, on-vehicle battery charging outfit and on-vehicle DC/DC equipment.
Background
The inevitable trend of future development of electric automobiles, and the development of electric automobiles is generally established by main producing countries in the world as an important way for improving the competitiveness of the automobile industry, ensuring the energy safety and transforming low-carbon economy. The vehicle-mounted charging equipment and the vehicle-mounted DC/DC equipment are important parts of the electric automobile, when the whole automobile stops working, because the capacitance of the input/output ports of the equipment such as the motor controller, the vehicle-mounted charging equipment or the vehicle-mounted DC/DC equipment is large, residual charge exists on the capacitance, a bus is in a charged state, and if the automobile is dismounted and overhauled at the moment, the high bus voltage can cause great life risks to a human body. Therefore, the motor controller, the vehicle-mounted charging device or the vehicle-mounted DC/DC device needs to be provided with an active or passive discharging circuit, and the capacitor voltage can be reduced to be within a safe range in a short time when the vehicle is stopped. At present, passive discharge is generally realized by directly connecting a discharge resistor in parallel on a bus capacitor, and the resistance value is generally not too small in consideration of resistance loss, so that the discharge speed is slow and the discharge time is long. For active discharge, the existing scheme is generally realized by connecting a relay in series with a discharge resistor, when discharge is needed, the relay is closed, and discharge is realized through the discharge resistor.
SUMMERY OF THE UTILITY MODEL
The utility model provides a discharge circuit, machine controller, on-vehicle battery charging outfit and on-vehicle DC equipment aims at solving the technical problem that residual charge can cause the injury to the human body on the bus-bar electric capacity.
The utility model provides a discharge circuit, it includes: the negative feedback constant current discharge unit is connected to two ends of the bus capacitor and is used for discharging the bus capacitor; and the control unit is connected with the negative feedback constant current discharge unit and is used for controlling the negative feedback constant current discharge unit to execute discharge.
Further, the negative feedback constant current discharge unit comprises a first N-type MOS transistor, an NPN-type triode, a first resistor and a second resistor, wherein a drain electrode of the first N-type MOS transistor is connected with the bus capacitor, a source electrode of the first N-type MOS transistor is connected with one end of the first resistor, a gate electrode of the first N-type MOS transistor is connected between the second resistor and a collector electrode of the NPN-type triode, the other end of the first resistor is grounded, one end of the second resistor is connected with the bus capacitor, the other end of the second resistor is connected with the collector electrode of the NPN-type triode, an emitter electrode of the NPN-type triode is grounded, and a base electrode of the NPN-type triode is connected between the source electrode of the first N-type MOS transistor and the first resistor.
Further, the control unit comprises a second N-type MOS transistor, a third resistor, a fourth resistor and a voltage regulator, a drain of the second N-type MOS transistor is connected with one end of the third resistor, a source of the second N-type MOS transistor is grounded, a gate of the second N-type MOS transistor is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with a power supply, the other end of the third resistor is connected between the second resistor and a collector of the NPN-type triode, a negative electrode of the voltage regulator is connected between the second resistor and the collector of the NPN-type triode, and a positive electrode of the voltage regulator is grounded.
Further, the control unit further includes: and the active control subunit is used for providing a control signal to actively execute discharge, and the active control subunit is connected with the grid electrode of the second N-type MOS tube.
Further, the active control subunit includes a control chip and a diode, the control chip is connected to the power supply, a cathode of the diode is connected to the control chip, and an anode of the diode is connected between the gate of the second N-type MOS transistor and the fourth resistor.
Further, the cathode of the diode is connected with a GPIO interface of the control chip.
Further, the second resistor is composed of a plurality of resistors connected in series.
The utility model also provides a motor controller, it includes: and the discharge circuit is the discharge circuit, and is connected with a bus capacitor of the motor controller.
The utility model also provides an on-vehicle battery charging outfit, it includes: and the discharging circuit is the discharging circuit, and is connected with a bus capacitor of the vehicle-mounted charging equipment.
The utility model also provides an on-vehicle DC/DC equipment, it includes: and the discharge circuit is the discharge circuit, and is connected with a bus capacitor of the vehicle-mounted DC/DC equipment.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a set up negative feedback constant current discharge unit at bus-bar capacitance's both ends to utilize the control unit to control negative feedback constant current discharge unit and carry out and discharge to bus-bar capacitance, steerable discharge current size, it is fast to discharge, small, with low costs, the reliability is high.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic block diagram of a discharge circuit of the present invention; and
fig. 2 is a schematic circuit diagram of the discharge circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1, an embodiment of a discharge circuit 100 provided by the present invention is shown. The utility model discloses use in the charging and discharging equipment of being connected with electric automobile high voltage battery side, adopt the utility model provides a discharge circuit 100 can realize discharging fast to this type of charging and discharging equipment's generating line electric capacity C1. The discharge circuit 100 includes: the negative feedback constant current discharge unit 10 is used for discharging a bus capacitor C1, and the negative feedback constant current discharge unit 10 is connected to two ends of the bus capacitor C1; the control unit 20 is used for controlling the negative feedback constant current discharge unit 10 to execute discharge, and the control unit 20 is connected with the negative feedback constant current discharge unit 10. Through the design, the negative feedback constant current discharge unit 10 is controlled by the control unit 20 to discharge the bus capacitor C1, so that the voltage of the bus capacitor C1 can be reduced within a safety range in a short time when the whole vehicle stops working, and the life safety of maintainers is protected.
In one embodiment, for example, in this embodiment, the negative feedback constant current discharge unit 10 includes a first N-type MOS transistor Q1, an NPN transistor Q2, a first resistor R1 and a second resistor R2, the drain electrode of the first N-type MOS transistor Q1 is connected with the bus capacitor C1, the source electrode of the first N-type MOS transistor Q1 is connected with one end of the first resistor R1, the gate of the first N-type MOS transistor Q1 is connected between the second resistor R2 and the collector of the NPN transistor Q2, the other end of the first resistor R1 is grounded, one end of the second resistor R2 is connected with the bus capacitor C1, the other end of the second resistor R2 is connected to the collector of the NPN transistor Q2, the emitter of the NPN transistor Q2 is grounded, and the base of the NPN transistor Q2 is connected between the source of the first N-type MOS transistor Q1 and the first resistor R1. When the negative feedback constant current discharge unit 10 works, the bus capacitor C1 is discharged, and the negative feedback constant current discharge unit 10 can control the magnitude of the discharge current, so that the bus capacitor C1 discharges at a constant current, the discharge speed is higher, and the discharge time is shorter.
In an embodiment, for example, in the embodiment, the control unit 20 includes a second N-type MOS transistor Q3, a third resistor R3, a fourth resistor R4, and a regulator Z1, a drain of the second N-type MOS transistor Q3 is connected to one end of the third resistor R3, a source of the second N-type MOS transistor Q3 is grounded, a gate of the second N-type MOS transistor Q3 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the power supply Vs, the other end of the third resistor R3 is connected between the second resistor R2 and a collector of the NPN-type triode Q2, a negative electrode of the regulator Z1 is connected between the second resistor R2 and the collector of the NPN-type triode Q2, and a positive electrode of the regulator Z1 is grounded. With the above design, when the second N-type MOS transistor Q3 is turned on, the negative feedback constant current discharge unit 10 does not perform discharge, and when the second N-type MOS transistor Q3 is turned off, the negative feedback constant current discharge unit 10 performs discharge. That is, the on or off of the second N-type MOS transistor Q3 is used to control whether the negative feedback constant current discharge unit 10 performs discharge. The control of the negative feedback constant current discharge unit 10 to discharge the bus capacitor C1 is realized.
In one embodiment, for example, in this embodiment, the second resistor R2 is composed of a plurality of resistors connected in series. Since the reliability of discharge is ensured by considering the withstand voltage and the loss of the resistor, a plurality of resistors are connected in series to form the second resistor R2.
The operation principle of the discharge circuit 100 in the present embodiment is described below:
when the normal work is carried out: the power supply Vs provides a pull-up voltage to the fourth resistor R4, so that the second N-type MOS transistor Q3 is turned on. Since the resistance of the third resistor R3 is much smaller than the resistance of the second resistor R2, the first N-type MOS transistor Q1 cannot be turned on. At this time, only the second resistor R2 and the third resistor R3 are connected to the bus capacitor C1, and since the resistance of the second resistor R2 is large and the current is small and negligible, it can be considered that the discharge circuit 100 does not perform the discharge operation at this time.
When the machine is shut down: the power supply Vs is turned off and cannot provide a pull-up voltage to the fourth resistor R4, so that the second N-type MOS transistor Q3 is turned off. Since the clamping voltage of the above-mentioned stabilivolt Z1 is greater than the turn-on voltage of the first N-type MOS transistor Q1, the first N-type MOS transistor Q1 is turned on, so as to supply the voltage to the first resistor R1, a discharge current is formed on the first resistor R1, and the bus capacitor C1 is discharged through the first resistor R1. Meanwhile, the voltage of the first resistor R1 turns on the NPN transistor Q2. The on state of the NPN transistor Q2 pulls down the gate voltage of the first N-type MOS transistor Q1, and after the first N-type MOS transistor Q1 is turned off, the first resistor R1 loses the voltage for turning on the NPN transistor Q2, so that the gate voltage of the first N-type MOS transistor Q1 cannot be pulled down, and the first N-type MOS transistor Q1 is turned on again. Therefore, when the negative feedback constant current discharge unit 10 works, the first N-type MOS transistor Q1 is not completely turned on, the NPN-type transistor Q2 is in critical conduction, and the negative feedback function of the NPN-type transistor Q2 and the first N-type MOS transistor Q1 realize the constant current discharge of the bus capacitor C1 after shutdown.
The embodiment of the utility model provides a show a discharge circuit 100, it sets up negative feedback constant current discharge unit 10 through the both ends at bus capacitance C1 to utilize the control unit 20 to control negative feedback constant current discharge unit 10 and carry out and discharge to bus capacitance C1, steerable discharge current size, it is fast to discharge, small, with low costs, the reliability is high.
In another embodiment, the control unit 20 further includes: an active control subunit 21, where the active control subunit 21 is configured to provide a control signal to actively perform discharging, and the active control subunit 21 is connected to the gate of the second N-type MOS transistor Q3. The active control subunit 21 is arranged to control the negative feedback constant current discharge unit 10 to actively discharge the bus capacitor C1. The active control subunit 21 is mainly configured to provide a voltage signal for turning on or off the second N-type MOS transistor Q3 to the gate of the second N-type MOS transistor Q3. It will therefore be appreciated that the active control subunit 21 may take a variety of forms, so long as it is capable of providing a control signal.
In an embodiment, for example, in the present embodiment, the active control subunit 21 includes a control chip and a diode D1, the control chip is connected to the power supply Vs, a cathode of the diode D1 is connected to the control chip, and an anode of the diode D1 is connected between the gate of the second N-type MOS transistor Q3 and the fourth resistor R4. And the cathode of the diode D1 is connected with the GPIO interface of the control chip. The control chip is an MCU, and the GPIO is a general port of the MCU. A high level signal or a low level signal is provided to the gate of the second N-type MOS transistor Q3 through the control chip to control the second N-type MOS transistor Q3 to be turned on or off, so as to control whether the negative feedback constant current discharge unit 10 actively discharges the bus capacitor C1. Through the design, the bus capacitor C1 is actively discharged, the life safety of maintainers is guaranteed, and the reliability is improved.
The operation principle of the discharge circuit 100 in the present embodiment is described below:
when the control chip works normally, the control chip outputs a high-level signal through the GPIO, so that the second N-type MOS tube Q3 is conducted. The second N-type MOS transistor Q3 is turned on, so that the negative feedback constant current discharge unit 10 does not perform a discharge operation.
When the control chip works normally, the control chip outputs a low-level signal through GPIO (general purpose input/output), so that the second N-type MOS transistor Q3 is cut off. The second N-type MOS transistor Q3 is turned off, so that the negative feedback constant current discharge unit 10 performs a discharge operation to discharge the bus capacitor C1.
When the power supply is shut down, the power supply Vs is turned off, and cannot supply power to the control chip or provide a pull-up voltage to the fourth resistor R4, so that the second N-type MOS transistor Q3 is turned off. The second N-type MOS transistor Q3 is turned off, so that the negative feedback constant current discharge unit 10 performs a discharge operation to discharge the bus capacitor C1.
In a specific embodiment, the parameters for each device are selected as follows: the second resistor R2 is formed by connecting three resistors with the resistance of 100K omega in series, the third resistor R3 is a resistor with the resistance of 100 omega, the Zener tube voltage stabilization voltage is 11V, the complete conduction voltage of the first N-type MOS tube Q1 is 6V, the conduction voltage drop of the NPN-type triode Q2 is 0.6V, and the resistance of the first resistor R1 is 24 omega. When the discharging operation is executed, the NPN type triode Q2 is critical-switched on, and the discharging current is 0.6V/24 Ω, i.e., 25 mA.
The embodiment of the utility model provides a discharge circuit 100 has been demonstrated, it sets up negative feedback constant current discharge unit 10 through the both ends at bus-bar capacitance C1 to utilize the active control subelement 21 among the control unit 20 to control negative feedback constant current discharge unit 10 and carry out and discharge to bus-bar capacitance C1 initiative, can initiatively carry out and discharge, control discharge current size, discharge fast, small, with low costs, the reliability is high.
In another embodiment, the present invention discloses a motor controller, wherein the motor controller is a device connected to a high voltage battery, the motor controller includes the discharging circuit 100 of the above embodiment, the discharging circuit 100 is connected to the bus capacitor C1 of the motor controller, and the discharging circuit 100 can actively or passively discharge the bus capacitor C1.
In another embodiment, the present invention shows a vehicle-mounted charging device, wherein the vehicle-mounted charging device is connected to a high-voltage battery, the vehicle-mounted charging device includes the discharging circuit 100 of the above embodiment, the discharging circuit 100 is connected to the bus capacitor C1 of the vehicle-mounted charging device, and the bus capacitor C1 can be actively or passively discharged through the discharging circuit 100.
In yet another embodiment, the present invention provides an on-vehicle DC/DC device, wherein the on-vehicle DC/DC device is connected to a high-voltage battery, the on-vehicle DC/DC device includes the discharging circuit 100 according to the above embodiments, the discharging circuit 100 is connected to the bus capacitor C1 of the on-vehicle DC/DC device, and the bus capacitor C1 can be actively or passively discharged through the discharging circuit 100.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A discharge circuit, comprising:
the negative feedback constant current discharge unit is connected to two ends of the bus capacitor and is used for discharging the bus capacitor;
the control unit is connected with the negative feedback constant current discharge unit and is used for controlling the negative feedback constant current discharge unit to execute discharge;
the negative feedback constant current discharge unit comprises a first N-type MOS tube, an NPN-type triode, a first resistor and a second resistor, wherein the drain electrode of the first N-type MOS tube is connected with the bus capacitor, the source electrode of the first N-type MOS tube is connected with one end of the first resistor, the grid electrode of the first N-type MOS tube is connected between the second resistor and the collector electrode of the NPN-type triode, the other end of the first resistor is grounded, one end of the second resistor is connected with the bus capacitor, the other end of the second resistor is connected with the collector electrode of the NPN-type triode, the emitter electrode of the NPN-type triode is grounded, and the base electrode of the NPN-type triode is connected between the source electrode of the first N-type MOS tube and the first resistor;
the control unit comprises a second N-type MOS tube, a third resistor, a fourth resistor and a voltage regulator tube, wherein the drain electrode of the second N-type MOS tube is connected with one end of the third resistor, the source electrode of the second N-type MOS tube is grounded, the grid electrode of the second N-type MOS tube is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with a power supply, the other end of the third resistor is connected between the second resistor and the collector electrode of the NPN-type triode, the negative electrode of the voltage regulator tube is connected between the second resistor and the collector electrode of the NPN-type triode, and the positive electrode of the voltage regulator tube is grounded.
2. The discharge circuit of claim 1, wherein the control unit further comprises: and the active control subunit is used for providing a control signal to actively execute discharge, and the active control subunit is connected with the grid electrode of the second N-type MOS tube.
3. The discharge circuit according to claim 2, wherein the active control subunit includes a control chip and a diode, the control chip is connected to the power supply, a cathode of the diode is connected to the control chip, and an anode of the diode is connected between the gate of the second N-type MOS transistor and the fourth resistor.
4. The discharge circuit of claim 3, wherein the cathode of the diode is connected with a GPIO interface of the control chip.
5. The discharge circuit of claim 1, wherein the second resistor is comprised of a plurality of resistors connected in series.
6. A motor controller, comprising: a discharge circuit as claimed in any one of claims 1 to 5 connected to a bus capacitor of the motor controller.
7. An in-vehicle charging apparatus characterized by comprising: the discharging circuit, the discharging circuit is the discharging circuit of any one of claims 1-5, and the discharging circuit is connected with a bus capacitor of the vehicle-mounted charging equipment.
8. An onboard DC/DC device, comprising: a discharge circuit according to any one of claims 1 to 5 connected to a bus capacitance of the on-board DC/DC device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921488036.3U CN211710757U (en) | 2019-09-06 | 2019-09-06 | Discharge circuit, motor controller, vehicle-mounted charging device, and vehicle-mounted DC/DC device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921488036.3U CN211710757U (en) | 2019-09-06 | 2019-09-06 | Discharge circuit, motor controller, vehicle-mounted charging device, and vehicle-mounted DC/DC device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211710757U true CN211710757U (en) | 2020-10-20 |
Family
ID=72813486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921488036.3U Active CN211710757U (en) | 2019-09-06 | 2019-09-06 | Discharge circuit, motor controller, vehicle-mounted charging device, and vehicle-mounted DC/DC device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211710757U (en) |
-
2019
- 2019-09-06 CN CN201921488036.3U patent/CN211710757U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207853453U (en) | Backup battery circuit, motor driver and electric vehicle | |
| CN102761161B (en) | Mobile power supply | |
| CN102983608A (en) | Composite lithium battery and supercapacitor power supply control device for electromobile | |
| CN106828136A (en) | The control circuit of battery management system, battery management system and electric vehicle | |
| CN102624371B (en) | Output circuit, temperature switch IC and set of cells | |
| CN211209339U (en) | Battery protection circuit, vehicle-mounted charger and electric automobile | |
| CN106981902A (en) | A kind of charge-discharge circuit suitable for vehicle-mounted audio host backup nickel-hydrogen battery | |
| CN211710757U (en) | Discharge circuit, motor controller, vehicle-mounted charging device, and vehicle-mounted DC/DC device | |
| KR20130080943A (en) | Discharging circuit of input unit for large capacity inverter | |
| CN107069902A (en) | power supply circuit for battery management system | |
| US11824397B2 (en) | Pre-charge current control device | |
| CN215498732U (en) | Switch module, battery management system, battery pack and electric device | |
| CN209823449U (en) | Backup power supply management device and vehicle-mounted equipment | |
| CN113119732A (en) | Power supply control method and system and new energy automobile | |
| CN219875155U (en) | Power supply circuit of battery management system | |
| CN218514305U (en) | Bus capacitor pre-charging circuit | |
| JP2019198195A (en) | On-vehicle lithium ion battery control device | |
| CN112564194A (en) | Battery device, discharge system and discharge method | |
| CN109188961A (en) | Automobile charge and discharge vehicle-mounted control terminal | |
| CN213717638U (en) | Dual-redundancy selection circuit based on constant current charging | |
| CN107546827B (en) | Electric power compensation circuit of vehicle-mounted power supply | |
| CN201994835U (en) | Vehicle-mounted power supply circuit | |
| CN221162246U (en) | Wake-up circuit and controller of new energy automobile and new energy automobile | |
| CN217824355U (en) | Multi-battery parallel access system | |
| CN214480264U (en) | Input anti-surge circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211209 Address after: 518000 Room 301, building 2, yingweiteng Guangming Technology Building, shutianpu community, Matian street, Guangming District, Shenzhen, Guangdong Patentee after: Invt Electric Vehicle Drive Technology (Shenzhen) Co.,Ltd. Address before: 518000 3rd floor, building 2, Longjing Gaofa Science Park, Taoyuan Street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN INVT ELECTRIC AUTOMOBILE CHARGING TECHNOLOGY CO.,LTD. |
|
| TR01 | Transfer of patent right |