CN113511074B - Backup power supply circuit, device and equipment of motor controller - Google Patents

Backup power supply circuit, device and equipment of motor controller Download PDF

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Publication number
CN113511074B
CN113511074B CN202110457119.1A CN202110457119A CN113511074B CN 113511074 B CN113511074 B CN 113511074B CN 202110457119 A CN202110457119 A CN 202110457119A CN 113511074 B CN113511074 B CN 113511074B
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Prior art keywords
power supply
voltage
circuit
backup power
pin
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CN113511074A (en
Inventor
林俐
张威
黄子
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Anhui Jianghuai Automobile Group Corp
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Anhui Jianghuai Automobile Group Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/066—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems characterised by the use of dynamo-electric machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/10—Applications of fuel cells in buildings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The invention discloses a backup power supply circuit, a backup power supply device and backup power supply equipment of a motor controller, and relates to the technical field of electric automobiles. The backup power supply circuit includes: the backup power supply control circuit comprises a power supply unit, a backup power supply starting circuit, a backup power supply connected with the output end of the backup power supply starting circuit and a voltage detection circuit connected with the power supply unit and the backup power supply starting circuit, wherein the backup power supply is controlled by the backup power supply starting circuit to supply power to a motor controller when a detection signal corresponding to the power supply voltage output by the power supply unit is detected to be a low-level signal through the voltage detection circuit, so that the condition that the power of the whole vehicle is lost due to abnormal power supply of the motor controller when the power supply voltage output by the power supply unit is abnormal or power failure is avoided.

Description

Backup power supply circuit, device and equipment of motor controller
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a power supply circuit, a device and equipment of a backup power supply of a motor controller.
Background
In a power system of an electric vehicle, a motor controller plays an important role, and the motor controller can convert electric energy stored by a power battery into electric energy required by a driving motor according to instructions of gears, an accelerator, a brake and the like so as to control running states of the electric vehicle such as starting operation, advancing and retreating speed, climbing force and the like. However, in specific use, the motor controller needs to be continuously supplied with low-voltage power to maintain the normal working state of the motor controller, once the low-voltage power supply is abnormal or the power is directly cut off, the motor controller does not have electric energy to continue working, further, abnormal vehicle driving can be directly caused, and the whole vehicle loses power.
Therefore, for the above situations, how to maintain the normal working state of the driving motor controller when the low-voltage power supply of the motor controller is abnormal or power failure occurs, so that the whole vehicle can normally run is a problem which needs to be solved urgently at present.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a power supply circuit, a device and equipment of a backup power supply of a motor controller, and aims to solve the technical problem that the motor controller cannot normally work when low-voltage power supply abnormality or power failure occurs in the motor controller in the prior art.
In order to achieve the above object, the present invention provides a backup power supply circuit of a motor controller, the backup power supply circuit including: the power supply unit, the voltage detection circuit and the backup power supply starting circuit;
the input end of the voltage detection circuit is connected with the power supply unit, the output end of the voltage detection circuit is connected with the input end of the backup power supply starting circuit, and the output end of the backup power supply starting circuit is connected with the backup power supply;
the voltage detection circuit is used for detecting the power supply voltage output by the power supply unit and outputting a detection signal;
and the backup power supply starting circuit is used for controlling the backup power supply to supply power to the motor controller when detecting that the detection signal is a low-level signal.
Optionally, the backup power supply starting circuit includes: the photoelectric coupler comprises a fourth resistor, a photoelectric coupler, a fifth resistor, a first chip and a second chip;
the first pin of the photoelectric coupler receives the detection signal through the fourth resistor, the third pin of the photoelectric coupler is grounded, the sixth pin of the photoelectric coupler is connected with the sixth pin of the second chip, and the fourth pin of the photoelectric coupler and the sixth pin of the first chip are connected with the sixth pin of the first chip and the sixth pin of the first chip is grounded through the fifth resistor.
Optionally, the first chip is configured to output a power supply start signal to the backup power supply when the sixth pin does not receive a high level signal;
and the second chip is used for controlling the first chip to stop working when the detection signal is detected to be a high-level signal.
Optionally, the voltage detection circuit includes: the voltage-dividing circuit comprises a first voltage input unit, a second voltage input unit, a third voltage input unit, a first voltage-dividing circuit, a second voltage-dividing circuit, a third voltage-dividing circuit, a voltage comparison unit and a voltage output unit;
the voltage comparison unit includes a first comparator and a second comparator.
Optionally, a first terminal of the first voltage dividing circuit is connected to the first voltage input unit, a second terminal of the first voltage dividing circuit is connected to the non-inverting terminal of the first comparator, a first terminal of the second voltage dividing circuit is connected to the second voltage input unit, the second voltage input unit is connected to the power supply unit, a first output terminal of the second voltage dividing circuit is connected to the inverting terminal of the first comparator, a second output terminal of the second voltage dividing circuit is connected to the non-inverting terminal of the second comparator, a first terminal of the third voltage dividing circuit is connected to the third voltage input unit, a second terminal of the third voltage dividing circuit is connected to the inverting terminal of the second comparator, and output terminals of the first comparator and the second comparator are both connected to the voltage output unit.
Optionally, the backup power supply is configured to input a standard operating voltage to the low voltage processing circuit when receiving a power supply start signal output by the backup power supply start circuit, so as to maintain a normal operating state of the motor controller.
Optionally, the second voltage dividing circuit includes: the circuit comprises a diode, a first resistor, a second resistor and a first capacitor;
the first end of the diode is connected with the second voltage input unit, the second end of the diode is connected with the first end of the first capacitor and the first end of the first resistor, the second end of the first capacitor is connected with the first end of the second resistor, the second end of the first capacitor needs to be grounded, and the second end of the first resistor and the second end of the second resistor are connected with each other and are connected with the voltage comparison unit.
Optionally, the first voltage dividing circuit is configured to divide the voltage provided by the first voltage input unit, so that a voltage value input to the same-phase pin of the first comparator meets a preset voltage value.
In addition, in order to achieve the above object, the present invention further provides a backup power supply device, which includes the backup power supply circuit of the motor controller as described above.
In addition, in order to achieve the above object, the present invention further provides a backup power supply device, which includes the backup power supply apparatus as described above.
In the present invention, a backup power supply circuit of a motor controller is provided, the backup power supply circuit including: supply unit, voltage detection circuit and backup power supply starting circuit, voltage detection circuit's input with supply unit connects, voltage detection circuit's output with backup power supply starting circuit's input is connected, backup power supply starting circuit's output is connected the backup power supply, voltage detection circuit, it is right to be used for supply voltage that supply unit exports detects to output detected signal, backup power supply starting circuit is used for detecting when detected signal is low level signal, control the backup power supply supplies power to machine controller. Through introducing the voltage detection circuit, detect motor controller's supply voltage, thereby realized when detecting motor controller low pressure power supply abnormity or fall the power, through voltage detection circuit to backup power supply starting circuit output low level detected signal, thereby trigger backup power supply starting circuit to backup power supply output power supply starting signal, make when low pressure power supply abnormity appears or fall the power, backup power supply can continue to supply power for motor controller, in order to maintain motor controller's normal operating condition, thereby avoided when motor controller loses power, whole car loses power, the condition of safety problem appears, electric vehicle's system reliability and car security have been improved.
Drawings
Fig. 1 is a schematic circuit diagram of a first embodiment of a backup power supply circuit of a motor controller according to the present invention;
FIG. 2 is a schematic circuit diagram of a first embodiment of a backup power supply circuit of a motor controller according to the present invention;
fig. 3 is a schematic circuit diagram of a backup power supply circuit of a motor controller according to a second embodiment of the present invention;
fig. 4 is a circuit connection diagram of a backup power supply circuit of a motor controller according to a second embodiment of the present invention.
The reference numbers illustrate:
reference numerals Name (R) Reference numerals Name (R)
100 Power supply unit 200 Voltage detection circuit
300 Backup power supply starting circuit 302 Second chip
301 First chip T Photosensitive triode
R1～R5 First to fifth resistors D Light emitting diode
201 First voltage input unit 202 Second voltage input unit
203 Third voltage input unit 204 A first voltage dividing circuit
205 Second voltage division circuit 206 Third voltage divider circuit
207 Voltage comparison unit 208 Voltage output unit
D1 Diode with a high-voltage source C2 Second capacitor
C1 First capacitor T1 First comparator
T2 Second comparator
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
Referring to fig. 1 and 2, fig. 1 is a schematic circuit structure diagram of a first embodiment of a backup power supply circuit of a motor controller according to the present invention, and fig. 2 is a schematic circuit connection diagram of the first embodiment of the backup power supply circuit of the motor controller according to the present invention.
As shown in fig. 1, in the present embodiment, the backup power supply circuit of the motor controller includes a power supply unit 100, a voltage detection circuit 200, and a backup power start circuit 300.
It should be noted that, in this embodiment, the power supply unit outputs a dc voltage in a standard range in principle, and the standard range may be specifically set according to a specific implementation scenario, for example, 9-16V or 9-15V, which is not limited in this embodiment.
The input end of the voltage detection circuit 200 is connected to the power supply unit 100, the output end of the voltage detection circuit 200 is connected to the input end of the backup power supply starting circuit 300, and the output end of the backup power supply starting circuit 300 is connected to a backup power supply;
it should be noted that the voltage detection circuit may detect the power supply voltage provided by the power supply unit, specifically, the voltage detection circuit may detect whether the voltage is abnormal or detect whether the power supply voltage is lost, and when detecting that the power supply voltage is abnormal or lost, the voltage detection circuit may output a low level signal, and when detecting that the power supply voltage is normal, the voltage detection circuit may output a high level signal.
The voltage detection circuit 200 is configured to detect the power supply voltage output by the power supply unit and output a detection signal 12V-Fault;
the backup power supply starting circuit 300 is configured to control the backup power supply to supply power to the motor controller when detecting that the detection signal 12V-Fault is a low level signal.
In an implementation, referring to fig. 2, the backup power supply starting circuit 300 includes: a fourth resistor R4, a photocoupler 303, a fifth resistor R5, a first chip 301 and a second chip 302;
the first chip 301 is configured to output a power supply start signal to the backup power supply when the sixth pin does not receive a high level signal;
the second chip 302 is configured to control the first chip to stop working when detecting that the detection signal is a high level signal.
It should be noted that the first chip is substantially a switching power supply chip, and when the sixth pin of the first chip does not receive a high level signal, a power supply start signal (substantially voltage) is output to the outside through a signal sending pin on the chip, for example, the power supply start signal output end may be connected to a transformer, and when a primary winding of the transformer receives voltage, the number of turns of the coil may be adjusted to control the secondary winding to output a standard voltage so as to maintain a normal working state of the motor controller. Of course, in the specific implementation, the object for implementing the backup power supply function may be a specific operating power supply, or other circuits that can achieve the same effect, such as a flyback circuit, a forward circuit, or an LLC circuit, and the present embodiment does not limit this.
The first pin of the photoelectric coupler 303 receives the detection signal 12V-Fault through the fourth resistor R4, the third pin of the photoelectric coupler 303 is grounded, the sixth pin of the photoelectric coupler 303 is connected with the sixth pin of the second chip 302, the fourth pin of the photoelectric coupler 303 is connected with the sixth pin of the first chip 301, and the sixth pin of the first chip 301 is grounded through the fifth resistor R5.
It should be noted that, after the power supply unit inputs the power supply voltage to the voltage detection circuit, the voltage detection circuit may detect the implemented power supply voltage and output a detection signal 12V-Fault, when the low-voltage power supply of the motor controller is normal, the 12V-Fault signal is a high level signal, at this time, the light emitting diode D in the optoelectronic coupler is turned on, and then the phototriode is turned on, at this time, the sixth pin of the first chip is turned on with the sixth pin of the second chip, it should be noted that, when the sixth pin of the first chip is connected with the sixth pin (i.e., VCC) of the second chip, at this time, the sixth pin of the first chip detects a continuous high level, the first chip will stop working, i.e., will not output a power supply start signal to the backup power supply, and at this time, the backup power supply does not receive the start signal, and therefore will not output a voltage. When the motor controller is powered abnormally by low voltage, the 12V-Fault signal is a low level signal, a light emitting diode in the photoelectric coupler cannot be conducted at the moment, and further the phototriode cannot be conducted, the sixth pin of the first chip does not detect continuous high level at the moment, the detected low level signal is a low level signal, the first chip starts to work, a power supply starting signal is output to a backup power supply through other pins (not marked in the figure), and when the backup power supply receives the starting signal, standard voltage is output to the motor controller to enable the motor controller to normally operate.
It should be noted that, when the 12V-Fault signal is a low level signal, the backup power start circuit cannot substantially receive the 12V-Fault detection signal, and since the sixth pin of the first chip is grounded and the sixth pin does not receive a continuous high level input, the detected low level signal is detected.
In this embodiment, by adjusting the resistance of the fourth resistor R4, the specific current input to the light emitting diode can be controlled, so as to protect the light emitting diode from being damaged.
In this embodiment, the backup power supply circuit includes: supply unit, voltage detection circuit and backup power starting circuit, voltage detection circuit's input with supply unit connects, voltage detection circuit's output with backup power starting circuit's input is connected, backup power starting circuit's output connects backup power, voltage detection circuit is used for right the power supply voltage of supply unit output detects to output detected signal, backup power starting circuit is used for detecting when detected signal is low level signal, control backup power supplies power to machine controller. By introducing the backup power supply starting circuit, the output voltage of the backup power supply is controlled by the backup power supply starting circuit when the low-voltage power supply abnormity or power failure of the motor controller is detected, so that the normal working state of the motor controller is maintained, and the condition of power interruption of the whole vehicle is avoided.
Referring to fig. 3 and 4, fig. 3 is a schematic circuit structure diagram of a backup power supply circuit of a motor controller according to a second embodiment of the present invention, and fig. 4 is a schematic circuit connection diagram of the backup power supply circuit of the motor controller according to the second embodiment of the present invention. Based on the first embodiment, a second embodiment of a backup power supply circuit for a motor controller is provided.
In the second embodiment, the voltage detection circuit 200 includes: a first voltage input unit 201, a second voltage input unit 202, a third voltage input unit 203, a first voltage division circuit 204, a second voltage division circuit 205, a third voltage division circuit 206, a voltage comparison unit 207, and a voltage output unit 208;
the voltage comparison unit 207 includes a first comparator T1 and a second comparator T2.
It should be noted that the second voltage input unit is configured to perform preprocessing, such as filtering processing, on the voltage input by the power supply unit, and the first voltage input unit and the third voltage input unit are configured to assist the first comparator and the second comparator in detecting the voltage range of the power supply voltage. In a specific implementation, the voltages output by the first voltage input unit and the third voltage input unit may be set specifically in a specific scenario by setting resistance values of corresponding resistors, which is not limited in this embodiment.
The first voltage dividing circuit 204 is configured to divide the voltage provided by the first voltage input unit 201, so that a voltage value input to the same-phase pin of the first comparator meets a preset voltage value.
A first end of the first voltage dividing circuit 204 is connected to the first voltage input unit 201, a second end of the first voltage dividing circuit 204 is connected to the non-inverting pin of the first comparator T1, a first end of the second voltage dividing circuit 205 is connected to the second voltage input unit 202, the second voltage input unit 202 is connected to the power supply unit 100, a first output end of the second voltage dividing circuit 205 is connected to the inverting pin of the first comparator T1, a second output end of the second voltage dividing circuit 205 is connected to the non-inverting pin of the second comparator T2, a first end of the third voltage dividing circuit 206 is connected to the third voltage input unit 203, a second end of the third voltage dividing circuit 206 is connected to the inverting pin of the second comparator T2, and output ends of the first comparator T1 and the second comparator T2 are connected to the voltage output unit 208.
It should be noted that the first comparator and the second comparator are configured to detect whether the voltage output by the power supply unit is within a standard voltage range, for example, if, in a certain scenario, the voltage input to the inverting terminal of the first comparator is controlled to be 2V by the first voltage dividing circuit, the voltage input to the inverting terminal of the second comparator is controlled to be 3.5V by the third voltage dividing circuit, and if the voltage input to the inverting terminal of the first comparator and the voltage input to the inverting terminal of the second comparator are both 3V by the second voltage dividing circuit, the first comparator outputs a low level signal and the second comparator outputs a low level signal, so that the 12V-Fault signal is a low level signal, that is, the signal input to the backup power supply starting circuit is a low level signal, and at this time, the first chip does not detect a high level, and further outputs a power supply starting signal to the backup power supply.
And the backup power supply is used for inputting standard working voltage to the low-voltage processing circuit when receiving a power supply starting signal output by the backup power supply starting circuit so as to maintain the normal working state of the motor controller.
It should be noted that, in actual operation, before the voltage output by the backup power supply enables the motor controller to work normally, the voltage output by the backup power supply needs to be processed by the low-voltage processing circuit, and then one or more required power supplies are further output through other facilities, for example, through a transformer.
The second voltage dividing circuit 205 includes: the circuit comprises a diode D1, a first resistor R1, a second resistor R2 and a first capacitor C1;
the first end of the diode D1 is connected to the second voltage input unit 202, the second end of the diode D1 is connected to the first end of the first capacitor C1 and the first end of the first resistor R1, the second end of the first capacitor C1 is connected to the first end of the second resistor R2, the second end of the first capacitor C1 is grounded, and the second end of the first resistor R1 and the second end of the second resistor R2 are connected to each other and to the voltage comparison unit 207.
It should be noted that the voltage input by the second voltage input unit is the real-time output voltage of the power supply unit, and the 12V-Fault signal is a low-level signal as long as it is detected that the power supply voltage is not within the standard voltage range.
It should be noted that, in this embodiment, when the output signals of the two comparators in the voltage detection circuit are both high, the 12V-Fault signal can be a high level signal, and when the output signal of one comparator is low, the 12V-Fault signal is a low level signal.
In a specific implementation, for example, 9 to 16V may be set as a standard voltage range, that is, the power supply of the motor controller is normal, and when it is detected that the voltage output by the second voltage input unit is not in the standard range, that is, the power supply of the motor controller is abnormal, at this time, the original power supply voltage needs to be cut off, and the backup power supply is started to continue to supply power to the motor controller.
For ease of understanding, the present embodiment will be specifically described with reference to fig. 4.
For example, if the first resistance value is set to be 30k, the second resistance value is 10k, the voltage input by the second voltage input unit is a specific value between 9V and 16V (when the power supply is normal), the voltage range detected by the inverting pin of the first comparator and the inverting pin of the second comparator is 2.25V to 4V, if the voltage output by the first voltage dividing circuit is controlled to be a specific value greater than 4V, for example, 4.01V, by setting the resistance value in the first voltage dividing circuit, the voltage output by the third voltage dividing circuit is controlled to be a specific value less than 2.25V, for example, 2.24V, at this time, the signals output by the two comparators are both high level, so that the 12V-Fault signal is a high level signal, the motor controller is detected to be normally powered, and the backup power supply start operation is not triggered. If the power supply voltage of the motor controller is abnormal, for example, 17V, the voltage of the inverting leg of the first comparator and the inverting leg of the second comparator is 4.25V, and the voltage of the inverting leg of the second comparator is 2.24V because the voltage of the inverting leg of the first comparator is 4.01V and the voltage of the inverting leg of the second comparator is 4.01V, the first comparator outputs a low level, the second comparator outputs a high level, and the 12V-Fault signal is a low level signal, the backup power supply is started to output the voltage. Similarly, if the power supply voltage is 0V, that is, when the power is down, the voltages of the inverting leg of the first comparator and the inverting leg of the second comparator are both 0V, the first comparator outputs a high level, the second comparator outputs a low level, and the 12V-Fault signal is a low level signal, the backup power supply is started to output the voltage. Similarly, if the power supply voltage is less than 9V, the 12V-Fault signal is also a low level signal, and the backup power supply output voltage is started, which is not described herein again.
It should be noted that the voltage output unit 208 includes a third resistor R3 and a second capacitor C2, the third resistor is sequentially connected to the second capacitor, a first end of the third resistor is externally connected to a power supply, and a second end of the second capacitor is grounded.
In the second embodiment, the detection of the power supply voltage of the motor controller is realized through the voltage detection circuit, the specific detection voltage range can be controlled through the resistance value in the voltage detection circuit, the operation is simple, the realization is easy, the flexibility is high, the process of outputting a power supply starting signal to the backup power supply through the backup power supply starting circuit when the power supply voltage is detected not to be in the standard voltage range or power failure is further realized, and the user experience is greatly improved.
In order to achieve the above object, the present invention further provides a backup power supply apparatus, which includes the backup power supply circuit of the motor controller as described above. Since the present apparatus employs all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and are not described in detail herein.
In order to achieve the above object, the present invention further provides a backup power supply device, which includes the backup power supply apparatus as described above. Since the present device adopts all the above technical solutions, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and are not described in detail herein.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (7)

1. A backup power supply circuit for a motor controller, said backup power supply circuit comprising: the power supply unit, the voltage detection circuit and the backup power supply starting circuit;
the input end of the voltage detection circuit is connected with the power supply unit, the output end of the voltage detection circuit is connected with the input end of the backup power supply starting circuit, and the output end of the backup power supply starting circuit is connected with the backup power supply;
the voltage detection circuit is used for detecting the power supply voltage output by the power supply unit and outputting a detection signal;
the backup power supply starting circuit is used for controlling the backup power supply to supply power to the motor controller when detecting that the detection signal is a low level signal;
wherein the backup power supply start-up circuit comprises: the photoelectric coupler comprises a fourth resistor, a photoelectric coupler, a fifth resistor, a first chip and a second chip;
a first pin of the photoelectric coupler receives the detection signal through the fourth resistor, a third pin of the photoelectric coupler is grounded, a sixth pin of the photoelectric coupler is connected with a sixth pin of the second chip, a fourth pin of the photoelectric coupler is connected with a sixth pin of the first chip, and the sixth pin of the first chip is grounded through the fifth resistor;
the first chip is used for outputting a power supply starting signal to the backup power supply when the sixth pin does not receive a high level signal;
the second chip is used for controlling the first chip to stop working when the detection signal is detected to be a high-level signal;
the voltage detection circuit includes: the voltage-dividing circuit comprises a first voltage input unit, a second voltage input unit, a third voltage input unit, a first voltage-dividing circuit, a second voltage-dividing circuit, a third voltage-dividing circuit, a voltage comparison unit and a voltage output unit;
the voltage comparison unit includes a first comparator and a second comparator.
2. The circuit according to claim 1, wherein a first terminal of the first voltage divider circuit is connected to the first voltage input unit, a second terminal of the first voltage divider circuit is connected to a non-inverting pin of the first comparator, a first terminal of the second voltage divider circuit is connected to the second voltage input unit, the second voltage input unit is connected to the power supply unit, a first output terminal of the second voltage divider circuit is connected to an inverting pin of the first comparator, a second output terminal of the second voltage divider circuit is connected to a non-inverting pin of the second comparator, a first terminal of the third voltage divider circuit is connected to the third voltage input unit, a second terminal of the third voltage divider circuit is connected to an inverting pin of the second comparator, and output terminals of the first comparator and the second comparator are connected to the voltage output unit.
3. The circuit of claim 2, wherein the backup power supply is configured to input a standard operating voltage to the low voltage processing circuit to maintain a normal operating state of the motor controller when receiving a power supply start signal output by the backup power supply start circuit.
4. The circuit of claim 1, wherein the second voltage divider circuit comprises: the circuit comprises a diode, a first resistor, a second resistor and a first capacitor;
the first end of the diode is connected with the second voltage input unit, the second end of the diode is connected with the first end of the first capacitor and the first end of the first resistor, the second end of the first capacitor is connected with the first end of the second resistor, the second end of the first capacitor needs to be grounded, and the second end of the first resistor and the second end of the second resistor are connected with each other and are connected with the voltage comparison unit.
5. The circuit of claim 1, wherein the first voltage dividing circuit is configured to divide the voltage provided by the first voltage input unit so that a voltage value input to the non-inverting terminal of the first comparator satisfies a predetermined voltage value.
6. A backup power supply unit, characterized in that it comprises a backup power supply circuit of a motor controller according to any of claims 1-5.
7. A backup power supply unit characterized in that it comprises the backup power supply device according to claim 6.
CN202110457119.1A 2021-04-26 2021-04-26 Backup power supply circuit, device and equipment of motor controller Active CN113511074B (en)

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