CN111880088A - Relay bilateral control and diagnosis circuit and method and battery management system - Google Patents
Relay bilateral control and diagnosis circuit and method and battery management system Download PDFInfo
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- CN111880088A CN111880088A CN202010718932.5A CN202010718932A CN111880088A CN 111880088 A CN111880088 A CN 111880088A CN 202010718932 A CN202010718932 A CN 202010718932A CN 111880088 A CN111880088 A CN 111880088A
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 78
- 230000002146 bilateral effect Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 113
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 238000002405 diagnostic procedure Methods 0.000 claims description 2
- 230000005669 field effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 14
- 230000002093 peripheral effect Effects 0.000 description 6
- 206010014357 Electric shock Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
Abstract
The invention discloses a relay bilateral control and diagnosis circuit, a relay bilateral control and diagnosis method and a battery management system. The circuit comprises: the diagnostic circuit comprises a power supply end, a grounding end, a diagnostic power supply, a high-side control module, a low-side control module, a control module and a diagnostic switch; the first end of the high-side control module is electrically connected with the power supply end, the second end of the high-side control module is electrically connected with the first end of the relay, and the control end of the high-side control module is electrically connected with the control module; the first end of the low-side control module is electrically connected with a grounding end, the second end of the low-side control module is electrically connected with the second end of the relay, and the control end of the low-side control module is electrically connected with the control module; the first end of the diagnosis switch is electrically connected with the diagnosis power supply, the second end of the diagnosis switch is electrically connected with the first end of the relay, and the control end of the diagnosis switch is electrically connected with the control module; the first voltage sampling end of the control module is electrically connected with the first end of the relay, and the second voltage sampling end of the control module is electrically connected with the second end of the relay. The embodiment of the invention can realize accurate control and fault detection of the relay.
Description
Technical Field
The embodiment of the invention relates to a relay control technology, in particular to a relay bilateral control and diagnosis circuit, a relay bilateral control and diagnosis method and a battery management system.
Background
With the increasing demand for energy and environmental protection, electric vehicles are becoming the development trend of modern vehicles with the advantages of cleanness, no pollution, high energy efficiency and the like as novel vehicles.
The power battery is used as a power source of the electric automobile, and is an indispensable component of the electric automobile. The power battery is connected or disconnected with an external circuit of the whole vehicle through the on-off of an internal relay of the power battery. When the relay cannot be controlled or fails, a Battery Management System (BMS) cannot open and close the relay by cutting off the low voltage drive of the relay. Especially when main positive relay and main negative relay can't be controlled when breaking, whole car will all be in high-voltage status at any moment, and no matter driver or maintenance person all have very big electric shock risk when operating whole car. The BMS is required to have accurate control of the relays and electrical fault detection capability.
The traditional relay control usually adopts a unilateral control method, namely high-side control or low-side control, and the control mode is that an MOS (metal oxide semiconductor) tube or a driving chip is controlled through an IO (input/output) port of a single chip microcomputer to control the on-off of a relay. The traditional control method has a simple structure, so that once a single-chip microcomputer instruction is given by mistake or a memory circuit is subjected to external large electromagnetic interference, the relay is easy to perform false switching action, the robustness of the system is low, the system is limited by the circuit, and the fault of the relay can not be diagnosed.
Disclosure of Invention
The invention provides a bilateral control and diagnosis circuit and method of a relay and a battery management system, which are used for realizing accurate control and fault detection of the relay.
In a first aspect, an embodiment of the present invention provides a relay bilateral control and diagnosis circuit, including: the diagnostic circuit comprises a power supply end, a grounding end, a diagnostic power supply, a high-side control module, a low-side control module, a control module and a diagnostic switch; the first end of the high-side control module is electrically connected with the power supply end, the second end of the high-side control module is electrically connected with the first end of the relay, and the control end of the high-side control module is electrically connected with the control module; the first end of the low-side control module is electrically connected with the grounding end, the second end of the low-side control module is electrically connected with the second end of the relay, and the control end of the low-side control module is electrically connected with the control module; the first end of the diagnosis switch is electrically connected with the diagnosis power supply, the second end of the diagnosis switch is electrically connected with the first end of the relay, and the control end of the diagnosis switch is electrically connected with the control module; a first voltage sampling end of the control module is electrically connected with a first end of the relay, and a second voltage sampling end of the control module is electrically connected with a second end of the relay; the control module is used for judging the fault type of the relay according to the state of the high-side control module, the state of the low-side control module, the state of the diagnosis switch, the sampling voltage of the first voltage sampling end and the sampling voltage of the second voltage sampling end.
Optionally, the method further comprises: the first end of the current detection module is electrically connected with the first end of the relay, and the second end of the current detection module is electrically connected with the control module; the control module is used for judging the fault type of the relay according to the current detected by the current detection module, the state of the high-side control module, the state of the low-side control module, the state of the diagnosis switch, the sampling value of the first voltage sampling end and the sampling type of the second voltage sampling end.
Optionally, the fault type includes: the relay is short-circuited to the ground, the relay load is open, the relay is short-circuited to a power supply and the relay is over-current; when the high-side control module controls the power supply end to be disconnected with the first end of the relay, the low-side control module controls the grounding end to be disconnected with the second end of the relay, and the diagnosis switch is switched on: if the sampling voltage of the second voltage sampling end is smaller than a first preset value, judging that the fault type is a low short circuit of the relay; if the sampling voltage of the second voltage sampling end is greater than a second preset value and smaller than a third preset value, judging that the fault type is open circuit of the relay load; if the sampling voltage of the second voltage sampling end is greater than a fourth preset value, judging that the fault type is a short circuit of the relay to a power supply; when the high-side control module controls the power supply end to be connected with the first end of the relay, the low-side control module controls the grounding end to be connected with the second end of the relay, and the diagnosis switch is disconnected: if the current detected by the current detection module is larger than a first preset current value, judging that the fault type is relay overcurrent; if the current detected by the current detection module is smaller than a second preset current value and the sampling voltage of the second voltage sampling end is smaller than the first preset value, judging that the fault type is open circuit of the relay load; and if the current detected by the current detection module is smaller than the second preset current value and the sampling voltage of the second voltage sampling end is larger than a fifth preset value, judging that the fault type is a short circuit of the relay to the power supply.
Optionally, the first preset value is 0.5v, the second preset value is 2v, the third preset value is 3v, the fourth preset value is (Vbat-0.3) v, the fifth preset value is (Vbat-0.5) v, the first preset current value is 1000 ma, the second preset current value is 112 ma, and Vbat is a voltage value of a power supply connected to the power supply end.
Optionally, when the high-side control module controls the power source terminal to be connected to the first terminal of the relay, the low-side control module controls the ground terminal to be connected to the second terminal of the relay, and the diagnostic switch is turned off: if the current detected by the current detection module is greater than or equal to the second preset current value and less than or equal to the first preset current value, judging that the relay is normally driven; when the high-side control module controls the power supply end to be disconnected with the first end of the relay, the low-side control module controls the grounding end to be disconnected with the second end of the relay, and the diagnosis switch is switched on: and if the sampling voltage of the second voltage sampling end is greater than a sixth preset value and smaller than a seventh preset value, and the sampling voltage of the first voltage sampling end is greater than the sixth preset value and smaller than the seventh preset value, judging that the relay is normally driven.
Optionally, the device further comprises a current limiting resistor; the current-limiting resistor is connected between the power supply end and the first end of the high-side control module.
Optionally, the diagnostic switch is a field effect transistor.
Optionally, the relay bilateral control and diagnosis circuit includes a BTS7040 chip and an L9301 chip, the high-side control module and the current detection module are integrated in the BTS7040 chip, and the low-side control module is the L9031 chip.
In a second aspect, an embodiment of the present invention further provides a method for controlling and diagnosing a relay bilateral, where the method is executed by the circuit for controlling and diagnosing a relay bilateral according to the first aspect, and the method includes: the control module controls the state of the high-side control module, the state of the low-side control module and the state of the diagnosis switch; the control module judges the fault type of the relay according to the state of the high-side control module, the state of the low-side control module, the state of the diagnosis switch, the sampling value of the first voltage sampling end and the sampling type of the second voltage sampling end.
In a third aspect, an embodiment of the present invention further provides a battery management system, including the relay bilateral control and diagnosis circuit in the first aspect.
According to the technical scheme of the embodiment of the invention, the adopted relay bilateral control and diagnosis circuit comprises a power supply end, a grounding end, a diagnosis power supply, a high-side control module, a low-side control module, a control module and a diagnosis switch; the first end of the high-side control module is electrically connected with a power supply end, the second end of the high-side control module is electrically connected with the first end of the relay, and the control end of the high-side control module is electrically connected with the control module; the first end of the low-side control module is electrically connected with the grounding end, the second end of the low-side control module is electrically connected with the second end of the relay, and the control end of the low-side control module is electrically connected with the control module; the first end of the diagnosis switch is electrically connected with the diagnosis power supply, the second end of the diagnosis switch is electrically connected with the first end of the relay, and the control end of the diagnosis switch is electrically connected with the control module; a first voltage sampling end of the control module is electrically connected with a first end of the relay, and a second voltage sampling end of the control module is electrically connected with a second end of the relay; the control module is used for judging the fault type of the relay according to the state of the high-side control module, the state of the low-side control module, the state of the diagnosis switch, the sampling voltage of the first voltage sampling end and the sampling voltage of the second voltage sampling end. The control module needs to send control signals to the high-side control module and the low-side control module to be conducted, so that current can flow in the relay coil, and compared with the control of only the high side or the low side of the relay, the relay coil has stronger anti-interference capability and better robustness. And can diagnose when relay and power end and/or earthing terminal do not switch on, also can diagnose in real time to the relay, application scope is wider.
Drawings
Fig. 1 is a schematic circuit structure diagram of a double-side control and diagnosis circuit of a relay according to an embodiment of the present invention;
fig. 2 is a schematic circuit structure diagram of another dual-side control and diagnosis circuit of a relay according to an embodiment of the present invention;
fig. 3 is a schematic circuit structure diagram of another dual-side control and diagnosis circuit of a relay according to an embodiment of the present invention;
fig. 4 is a schematic circuit structure diagram of another dual-side control and diagnosis circuit of a relay according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a peripheral circuit of a BTS7040 chip according to an embodiment of the present invention;
fig. 6 is a schematic circuit structure diagram of a peripheral circuit of an L9031 chip according to an embodiment of the present invention;
fig. 7 is a flowchart of a bilateral relay control and diagnostic method according to an embodiment of the present invention;
fig. 8 is a schematic circuit structure diagram of a battery management system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic circuit structure diagram of a dual-side control and diagnosis circuit of a relay according to an embodiment of the present invention, and referring to fig. 1, the circuit includes: the diagnostic circuit comprises a power supply terminal VCC, a ground terminal VDD, a diagnostic power supply 101, a high-side control module 102, a low-side control module 103, a control module 104 and a diagnostic switch 106; a first end of the high-side control module 102 is electrically connected with a power supply end, a second end of the high-side control module 102 is electrically connected with a first end of the relay 105, and a control end of the high-side control module 102 is electrically connected with the control module 104; a first end of the low-side control module 103 is electrically connected with a ground terminal VSS, a second end of the low-side control module 103 is electrically connected with a second end of the relay 105, and a control end of the low-side control module 103 is electrically connected with the control module 104; a first end of the diagnosis switch 106 is electrically connected with the diagnosis power supply 101, a second end of the diagnosis switch 106 is electrically connected with a first end of the relay 105, and a control end of the diagnosis switch 106 is electrically connected with the control module 104; a first voltage sampling end of the control module 104 is electrically connected with a first end of the relay 105, and a second voltage sampling end of the control module 104 is electrically connected with a second end of the relay 105; the control module 104 is configured to determine a fault type of the relay 105 according to a state of the high-side control module 102, a state of the low-side control module 103, a state of the diagnostic switch 106, a sampling voltage of the first voltage sampling terminal, and a sampling voltage of the second voltage sampling terminal.
Specifically, power end VCC may be used for external power, if connect the battery that is used for supplying power to relay 105, ground terminal VSS may ground, the first end of relay 105 may be the first end of relay coil, the second end of relay 105 may be the second end of relay coil, when the first end of relay switches on with power end VCC, the second end of relay switches on with the ground terminal, there is current flow in the relay coil to make the switch of relay closed, control the power battery output energy in the car. The high-side control module 102 can conduct the first end and the second end thereof under the action of the control signal of the control end thereof, for example, the control module 104 sends a control signal to the high-side control module 102, so that the first end and the second end of the high-side control module 102 are conducted, and further the power supply end VCC is conducted with the first end of the relay 105; the low-side control module 103 can conduct the first terminal and the second terminal thereof under the action of the control terminal control signal thereof, for example, the control module 104 sends a control signal to the low-side control module 102, so that the first terminal and the second terminal of the low-side control module 103 are conducted, and further the ground terminal VSS is conducted with the second terminal of the relay 105; the control module 104 may be, for example, a single chip microcomputer; only when high limit control module 102 and low limit control module 103 all switch on, just can the pressure differential be produced at the both ends of relay 105, and then make the overcurrent flow in relay 105, when at least one in high limit control module 102 and the low limit control module 103 does not switch on, can not have the electric current to flow through in the relay 105, also be the control module 104 need all send the signal that control switched on to high limit control module 102 and low limit control module 103, just can make the relay coil in flow current, compare in the high limit or the low limit of only controlling the relay, the interference killing feature is stronger, the robustness is better.
The conventional relay fault detection circuit cannot detect when the relay is not conducted with any one of the power source terminal and the ground terminal, and in this embodiment, the fault type of the relay 105 can be determined by the state of the high-side control module 102, the state of the low-side control module 103, the state of the diagnostic switch 106, the sampling voltage of the first voltage sampling terminal, and the sampling voltage of the second voltage sampling terminal. For example, when the high-side control module 102 and the low-side control module 103 are not conductive, the control module 104 may control the diagnostic switch 106 to be conductive, so that the first end of the relay 105 is written into the potential of the diagnostic power supply 101, and the potential of the second end of the relay 105 should also be the potential of the diagnostic power supply 101, if the relay 105 is shorted to ground, the potential of the second end of the relay 105 is pulled low, and the control module 104 may determine whether the relay has a short-circuit to ground fault according to the sampling voltage of the second sampling voltage end.
According to the technical scheme of the embodiment, the adopted relay bilateral control and diagnosis circuit comprises a power supply end, a grounding end, a diagnosis power supply, a high-side control module, a low-side control module, a control module and a diagnosis switch; the first end of the high-side control module is electrically connected with a power supply end, the second end of the high-side control module is electrically connected with the first end of the relay, and the control end of the high-side control module is electrically connected with the control module; the first end of the low-side control module is electrically connected with the grounding end, the second end of the low-side control module is electrically connected with the second end of the relay, and the control end of the low-side control module is electrically connected with the control module; the first end of the diagnosis switch is electrically connected with the diagnosis power supply, the second end of the diagnosis switch is electrically connected with the first end of the relay, and the control end of the diagnosis switch is electrically connected with the control module; a first voltage sampling end of the control module is electrically connected with a first end of the relay, and a second voltage sampling end of the control module is electrically connected with a second end of the relay; the control module is used for judging the fault type of the relay according to the state of the high-side control module, the state of the low-side control module, the state of the diagnosis switch, the sampling voltage of the first voltage sampling end and the sampling voltage of the second voltage sampling end. The control module needs to send control signals to the high-side control module and the low-side control module to be conducted, so that current can flow in the relay coil, and compared with the control of only the high side or the low side of the relay, the relay coil has stronger anti-interference capability and better robustness. And can diagnose when relay and power end and/or earthing terminal do not switch on, also can diagnose in real time to the relay, application scope is wider.
It should be noted that the voltage of the diagnostic power supply may be smaller than the voltage of the power supply connected to the power supply terminal VCC, and the voltage of the diagnostic power supply may be designed according to the type of the relay, and specifically, the difference between the voltage of the diagnostic power supply and the ground voltage of the ground terminal may be set so that the current generated in the relay is not enough to close the switch of the relay, thereby avoiding malfunction of the relay.
Optionally, fig. 2 is a schematic circuit structure diagram of another relay bilateral control and diagnosis circuit provided in an embodiment of the present invention, and referring to fig. 2, the circuit further includes: a current detection module 107, wherein a first end of the current detection module 107 is electrically connected with a first end of the relay 105, and a second end of the current detection module 107 is electrically connected with the control module 104; the control module 104 is configured to determine a fault type of the relay 105 according to the current detected by the current detection module 107, a state of the high-side control module 102, a state of the low-side control module 103, a state of the diagnostic switch 106, a sampling voltage of the first voltage sampling terminal, and a sampling voltage of the second voltage sampling terminal.
Specifically, the current detection module 107 can detect the current flowing through the coil of the relay 105, when the current in the coil of the relay is too large, the relay may be burned out, the current detection module 107 can diagnose the current to be sent to the control module 104 when the detected current is too large, and the control module 104 can send out warning information in time, for example, the high-side control module 102 and the low-side control module 103 are switched off in time, so as to prevent the relay from being burned out, and prolong the service life of the relay.
Optionally, the fault types include: relay-to-ground Short (STG), relay load Open (OPL), relay-to-power Short (SCV), and relay over-current (OCP); wherein, when the first end disconnection of high limit control module control power end and relay, the second end disconnection of low limit control module control earthing terminal and relay, when the diagnostic switch switches on:
if the sampling voltage of the second voltage sampling end is smaller than a first preset value, judging that the fault type is a low short circuit of the relay;
if the sampling voltage of the second voltage sampling end is greater than a second preset value and smaller than a third preset value, judging that the fault type is open circuit of the relay load;
if the sampling voltage of the second voltage sampling end is greater than a fourth preset value, judging that the fault type is short circuit of the relay to the power supply;
when the high-side control module controls the power supply end to be connected with the first end of the relay, the low-side control module controls the grounding end to be connected with the second end of the relay, and the diagnosis switch is disconnected:
if the current detected by the current detection module is larger than a first preset current value, judging that the fault type is relay overcurrent;
if the current detected by the current detection module is smaller than a second preset current value and the sampling voltage of the second voltage sampling end is smaller than a first preset value, judging that the fault type is a relay pair low short circuit;
and if the current detected by the current detection module is smaller than a second preset current value and the sampling voltage of the second voltage sampling end is larger than a fifth preset value, judging that the fault type is the short circuit of the relay to the power supply.
Illustratively, the first preset value is 0.5 volt, the second preset value is 2 volts, the third preset value is 3 volts, the fourth preset value is (Vbat-0.3) volts, the fifth preset value is (Vbat-0.5) volts, the first preset current value is 1000 milliamps, the second preset current value is 112 milliamps, and Vbat is a voltage value of a power supply connected with the power supply end.
When the high-side control module 102 and the low-side control module 103 are not conducted, that is, no current flows through the relay, the diagnostic switch can be controlled to be conducted, when the high-side control module 102 and the low-side control module 103 have no fault, the potentials at the two ends of the relay are the same as the voltage of a diagnostic power supply, and when the sampling voltage at the second voltage sampling end is smaller than the first preset value, the potential at the second end of the relay is pulled down, that is, the fault type is a short circuit of the relay to the ground; the low-side control module can adopt an L9031 chip, a weak pull-up current source is arranged in the L9301 chip, and when the low-side control module is suspended, the voltage (such as 2.5V) of the second voltage sampling end falls between a second preset value (2V) and a third preset value (3V), the relay load can be judged to be open-circuited, namely the fault type is the relay load open-circuit; when the sampling voltage of the second voltage sampling end is greater than the fourth preset value, the potential of the second end of the relay is pulled high, and the relay is conducted with a power supply end VCC, namely, the fault type is short circuit of the relay to the power supply.
When the high-side control module 102 and the low-side control module 103 are both turned on, that is, when a current flows through the relay, the diagnostic switch 106 may be controlled to be turned off, and when the current detected by the current detection module 107 is greater than a first preset current value, it indicates that the current flowing through the relay is too large, which may burn the relay, that is, the fault type is relay overcurrent; the high-side control module 107 may be a BTS7040 chip, and when the current detected by the current detection module 107 is smaller than a second preset current value (e.g., 112 milliamperes) and the sampling voltage of the second voltage sampling end is smaller than a first preset value (e.g., 0.5V), the MOS transistor inside the low-side driver chip L9301 is closed, i.e., short-circuited to ground, so that the sampling voltage of the second voltage sampling end is smaller than the first preset value at this time, which indicates that no short circuit of the relay to the power supply occurs, and in addition, according to the characteristics of the BTS7040 chip, it can be determined that the secondary load is open, that is, the fault type is; under normal conditions, because there is a voltage drop across the relay, the potential at the second terminal of the relay 105 should be smaller than the power supply voltage, and if the sampled voltage at the second voltage detection terminal is close to the power supply voltage, that is, greater than the fifth preset value, it indicates that the relay has a short circuit phenomenon with respect to the power supply, that is, the fault type is a short circuit of the relay with respect to the power supply.
Alternatively, when the high-side control module 102 controls the power terminal VCC to be connected to the first terminal of the relay 105, the low-side control module 103 controls the ground terminal VSS to be connected to the second terminal of the relay 105, and the diagnostic switch 106 is turned off: if the current detected 107 by the current detection module is greater than or equal to a second preset current value and less than or equal to a first preset current value, judging that the relay is normally driven; when the high-side control module 102 controls the power supply terminal VCC to be disconnected from the first terminal of the relay 105, the low-side control module 103 controls the ground terminal to be disconnected from the second terminal of the relay 105, and the diagnostic switch 106 is turned on: and if the sampling voltage of the second voltage sampling end is greater than the sixth preset value and smaller than the seventh preset value, and the sampling voltage of the first voltage sampling end is greater than the sixth preset value and smaller than the seventh preset value, judging that the relay is normally driven.
Illustratively, the sixth preset value may be (Vbat 0.9496-0.5) volts, and the seventh preset value may be (Vbat 0.9514) volts; the sixth preset value and the seventh preset value can be set according to the specific model of the relay, and when the relay is not conducted with the power supply end and the grounding end, whether the driving of the relay is normal (namely whether a fault occurs) can be judged by conducting the diagnosis switch 106; when the relay is conducted with the power supply end and the grounding end, whether the relay is normally driven can be judged by judging the current value detected by the current detection module.
For example, fig. 3 is a schematic circuit structure diagram of another relay bilateral control and diagnosis circuit according to an embodiment of the present invention, referring to fig. 3, the diagnosis switch 106 may be an MOS transistor, and both the high-side control module 102 and the low-side control module 103 may include MOS transistors, which have advantages of strong anti-interference capability, small leakage current during conduction, small conduction internal resistance, low cost, and the like, and are beneficial to reducing the overall cost.
Optionally, fig. 4 is a schematic circuit structure diagram of another relay bilateral control and diagnosis circuit according to an embodiment of the present invention, and referring to fig. 4, the circuit further includes a current limiting resistor 108, where the current limiting resistor 108 is connected between a power supply terminal VCC and a first end of the high-side control module 102.
Specifically, when the current in the relay 105 is too large, the relay may be burned out, and by providing the current limiting resistor 108, the current flowing through the relay 105 during normal operation is not too large, thereby preventing the relay from being burned out and prolonging the service life of the relay.
Optionally, the relay bilateral control and diagnosis circuit includes a BTS7040 chip and an L9301 chip, and the high-side control module 102 and the current detection module 107 are integrated in the BTS7040 chip. The high-side control module 102 and the current detection module 107 can be realized by using a BTS7040 chip, and the BTS7040 chip and the L9301 chip have the advantages of strong anti-interference capability, low cost and the like, have multi-output and can control a plurality of relays.
The embodiment of the present invention further provides a peripheral circuit of a BTS7040 chip-level L9031 chip, as shown in fig. 5 and 6, fig. 5 is a schematic circuit structure diagram of a peripheral circuit of a BTS7040 chip provided by the embodiment of the present invention, and fig. 6 is a schematic circuit structure diagram of a peripheral circuit of an L9031 chip provided by the embodiment of the present invention, where the peripheral circuit includes elements such as a resistor, a capacitor, and a diode, so as to cooperate with the BTS7040 chip and the L9031 chip to normally operate.
Fig. 7 is a flowchart of a method for bilateral control and diagnosis of a relay according to an embodiment of the present invention, where the method is executed by any one of the bilateral control and diagnosis circuits of the relay according to the embodiment of the present invention, and the method includes:
step S201, a control module controls the state of the high-side control module, the state of the low-side control module and the state of the diagnosis switch;
specifically, the control module can control the high-side control module and the low-side control module to be conducted or not conducted at the same time, so that bilateral control is achieved, and compared with unilateral control, the bilateral control device is higher in anti-jamming capability and better in robustness. And the control module can also control the state of the diagnostic switch so that the relay can be diagnosed both when the relay is working and when the relay is not working.
Step S202, the control module judges the fault type of the relay according to the state of the high-side control module, the state of the low-side control module, the state of the diagnosis switch, the sampling value of the first voltage sampling end and the sampling type of the second voltage sampling end. The method for determining the fault type can be referred to the description of the circuit part for controlling and diagnosing the double sides of the relay in the embodiment of the invention, and is not described herein again. The method provided by the embodiment of the invention can realize bilateral control on the relay, has stronger anti-jamming capability, can realize diagnosis on the relay when the relay works and does not work, and has wider application range.
Fig. 8 is a schematic circuit structure diagram of a battery management system according to an embodiment of the present invention, and a battery management system BMS 301 according to an embodiment of the present invention includes a relay bilateral control and diagnosis circuit according to any embodiment of the present invention, and therefore has the same advantageous effects, and is not described herein again. The battery management system 301 may be applied to a vehicle to manage a power battery of the vehicle.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A relay bilateral control and diagnostic circuit, comprising: the diagnostic circuit comprises a power supply end, a grounding end, a diagnostic power supply, a high-side control module, a low-side control module, a control module and a diagnostic switch;
the first end of the high-side control module is electrically connected with the power supply end, the second end of the high-side control module is electrically connected with the first end of the relay, and the control end of the high-side control module is electrically connected with the control module;
the first end of the low-side control module is electrically connected with the grounding end, the second end of the low-side control module is electrically connected with the second end of the relay, and the control end of the low-side control module is electrically connected with the control module;
the first end of the diagnosis switch is electrically connected with the diagnosis power supply, the second end of the diagnosis switch is electrically connected with the first end of the relay, and the control end of the diagnosis switch is electrically connected with the control module;
a first voltage sampling end of the control module is electrically connected with a first end of the relay, and a second voltage sampling end of the control module is electrically connected with a second end of the relay; the control module is used for judging the fault type of the relay according to the state of the high-side control module, the state of the low-side control module, the state of the diagnosis switch, the sampling voltage of the first voltage sampling end and the sampling voltage of the second voltage sampling end.
2. The relay bilateral control and diagnostic circuit of claim 1, further comprising:
the first end of the current detection module is electrically connected with the first end of the relay, and the second end of the current detection module is electrically connected with the control module;
the control module is used for judging the fault type of the relay according to the current detected by the current detection module, the state of the high-side control module, the state of the low-side control module, the state of the diagnosis switch, the sampling value of the first voltage sampling end and the sampling type of the second voltage sampling end.
3. The relay bilateral control and diagnostic circuit of claim 2, wherein the fault types include:
the relay is short-circuited to the ground, the relay load is open, the relay is short-circuited to a power supply and the relay is over-current;
when the high-side control module controls the power supply end to be disconnected with the first end of the relay, the low-side control module controls the grounding end to be disconnected with the second end of the relay, and the diagnosis switch is switched on:
if the sampling voltage of the second voltage sampling end is smaller than a first preset value, judging that the fault type is a low short circuit of the relay;
if the sampling voltage of the second voltage sampling end is greater than a second preset value and smaller than a third preset value, judging that the fault type is open circuit of the relay load;
if the sampling voltage of the second voltage sampling end is greater than a fourth preset value, judging that the fault type is a short circuit of the relay to a power supply;
when the high-side control module controls the power supply end to be connected with the first end of the relay, the low-side control module controls the grounding end to be connected with the second end of the relay, and the diagnosis switch is disconnected:
if the current detected by the current detection module is larger than a first preset current value, judging that the fault type is relay overcurrent;
if the current detected by the current detection module is smaller than a second preset current value and the sampling voltage of the second voltage sampling end is smaller than the first preset value, judging that the fault type is open circuit of the relay load;
and if the current detected by the current detection module is smaller than the second preset current value and the sampling voltage of the second voltage sampling end is larger than a fifth preset value, judging that the fault type is a short circuit of the relay to the power supply.
4. The relay bilateral control and diagnosis circuit according to claim 3, wherein the first preset value is 0.5 volts, the second preset value is 2 volts, the third preset value is 3 volts, the fourth preset value is (Vbat-0.3) volts, the fifth preset value is (Vbat-0.5) volts, the first preset current value is 1000 milliamps, the second preset current value is 112 milliamps, and the Vbat is a voltage value of a power source connected to the power source terminal.
5. The relay bilateral control and diagnostic circuit of claim 3,
when the high-side control module controls the power supply end to be connected with the first end of the relay, the low-side control module controls the grounding end to be connected with the second end of the relay, and the diagnosis switch is disconnected:
if the current detected by the current detection module is greater than or equal to the second preset current value and less than or equal to the first preset current value, judging that the relay is normally driven;
when the high-side control module controls the power supply end to be disconnected with the first end of the relay, the low-side control module controls the grounding end to be disconnected with the second end of the relay, and the diagnosis switch is switched on:
and if the sampling voltage of the second voltage sampling end is greater than a sixth preset value and smaller than a seventh preset value, and the sampling voltage of the first voltage sampling end is greater than the sixth preset value and smaller than the seventh preset value, judging that the relay is normally driven.
6. The relay bilateral control and diagnostic circuit of claim 1 further comprising a current limiting resistor;
the current-limiting resistor is connected between the power supply end and the first end of the high-side control module.
7. The relay bilateral control and diagnostic circuit of claim 1 wherein the diagnostic switch is a field effect transistor.
8. The relay bilateral control and diagnosis circuit according to claim 2, wherein the relay bilateral control and diagnosis circuit comprises a BTS7040 chip and an L9301 chip, the high-side control module and the current detection module are integrated in the BTS7040 chip, and the low-side control module is the L9301 chip.
9. A relay bilateral control and diagnostic method performed by the relay bilateral control and diagnostic circuit of any one of claims 1-8,
the method comprises the following steps:
the control module controls the state of the high-side control module, the state of the low-side control module and the state of the diagnosis switch;
the control module judges the fault type of the relay according to the state of the high-side control module, the state of the low-side control module, the state of the diagnosis switch, the sampling value of the first voltage sampling end and the sampling type of the second voltage sampling end.
10. A battery management system comprising the relay bilateral control and diagnostic circuit of any one of claims 1-8.
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