Control circuit of relay and vehicle

Abstract

The utility model provides a control circuit of a relay and a vehicle, and the control circuit of the relay comprises a current driving circuit which is connected with the relay and is used for receiving the driving current of the relay; the control circuit is connected with the current driving circuit and used for receiving the enable signal and the driving current of the relay and outputting the control signal of the relay, the on-off of the relay is changed by increasing the enable signal, the control circuit of the relay is prevented from being in a running state all the time, and therefore the probability that faults of the relay occur frequently is reduced, and the service life of the relay is prolonged. The stable operation and the production safety are ensured, and meanwhile, the static consumption can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially is related to a control circuit and vehicle of relay. BACKGROUND

[0002] With the increase of the number of new energy vehicles, high voltage / large current technology is more and more concerned by market and technical field, but because the current industry trend is high voltage / large current for improving charging rate or electrical appliance performance, often new energy vehicles in troubleshooting, the probability of large current relay sticking problem is higher, arc problem, poor contact or bottom fault, temperature rise, contact resistance increase and electrical element life reduction and other problems are prone to occur, thereby affecting the reliability of large current relay. SUMMARY

[0003] The utility model aims at at least one of the technical problems existing in prior art.

[0004] Therefore, one purpose of the utility model is to provide a control circuit of relay, which changes the on-off of the relay by increasing the enable signal, avoids the control circuit of the relay being always in operation state, thereby reduces the probability of frequent occurrence of relay failure, ensures stable operation and production safety, and also reduces static consumption.

[0005] Therefore, a second purpose of the utility model is to provide a vehicle.

[0006] In order to achieve the above purpose, an embodiment of the first aspect of the utility model provides a control circuit of relay, which comprises: a current driving circuit connected with the relay, used for receiving driving current of the relay; a control circuit connected with the current driving circuit, used for receiving enable signal and driving current of the relay, and outputting control signal of the relay.

[0007] The control circuit of relay according to the embodiment of the utility model receives the enable signal of the relay and the driving current of the relay sent by the current driving circuit, outputs the control signal of the relay according to the driving current size and enable demand, controls the relay to close or shut off, changes the on-off of the relay by increasing the enable signal, avoids the control circuit of the relay being always in operation state, thereby reduces the probability of frequent occurrence of relay failure, ensures stable operation and production safety, and also reduces static consumption.

[0008] In some embodiments, the current driving circuit comprises: a first current driving circuit connected with the relay, used for receiving reverse driving current of the relay; and a second current driving circuit connected with the relay, used for receiving forward driving current of the relay.

[0009] In some embodiments, the first current driving circuit comprises: a first current judging module, one end of the first current judging module being connected to the first end of the relay; a timing module, one end of the timing module being connected to the other end of the first current judging module, the other end of the timing module being grounded, the timing module being used to charge after receiving the reverse driving current; a current enhancing module, one end of the current enhancing module being connected to one end of the timing module, the current enhancing module being used to output an enhanced reverse driving current when receiving a preset voltage signal of the timing module; an optocoupler isolation module, one end of the optocoupler isolation module being connected to the other end of the current enhancing module, the optocoupler isolation module being used to isolate interference signals of the enhanced reverse driving current; and a current driving module, one end of the current driving module being connected to the control circuit, the other end of the current driving module being connected to the other end of the optocoupler isolation module, the current driving module being used to receive the enhanced reverse driving current and the enable signal, and output a reverse driving signal.

[0010] In some embodiments, the second current driving circuit comprises: a second current judging module, one end of the second current judging module being connected to the first end of the relay, the second current judging module being used to output a forward driving current when receiving a high-level signal of the reverse driving current; a forward voltage driving module, the first end of the forward voltage driving module being connected to the other end of the second current judging module, the second end of the forward voltage driving module being connected to the control circuit, the third end of the forward voltage driving module being connected to the electrical appliance, the forward voltage driving module being used to receive the forward driving current, output a forward driving voltage, and output a forward overvoltage delay driving signal when receiving a preset voltage signal of the forward driving voltage.

[0011] In some embodiments, the second current driving circuit further comprises: a second current collecting module, one end of the second current collecting module being connected to the first end of the relay, the other end of the second current collecting module being connected to the control circuit, the second current collecting module being used to receive the forward driving current, output an overcurrent delay driving signal when receiving a first preset current signal of the forward driving current, output a forward instant-off driving signal when receiving a second preset current signal of the forward driving current, and output a forward prevention driving signal when receiving a third preset current signal of the forward driving current; and an output signal amplification module, one end of the output signal amplification module being connected to the control circuit, the other end of the output signal amplification module being connected to the timing module, the output signal amplification module being used to receive and amplify the overcurrent delay driving signal, and output an amplified overcurrent delay driving signal.

[0012] In some embodiments, the first current judgment module includes: a second resistor, one end of the second resistor is connected to the first end of the relay; a first operational amplifier, a non-inverting input end of the first operational amplifier is connected to the first end of the relay, a reverse input end of the first operational amplifier is connected to the other end of the second resistor, a positive power input end of the first operational amplifier is connected to the power supply, and a negative power input end of the first operational amplifier is grounded; a fourth diode, one end of the fourth diode is connected to the output end of the first operational amplifier, and the other end of the fourth diode is connected to one end of the timing circuit.

[0013] In some embodiments, the timing module includes: a first capacitor, one end of which is connected to the other end of the fourth diode; a third resistor, one end of which is connected to the other end of the first capacitor, and the other end of the third resistor is grounded.

[0014] In some embodiments, the current enhancement module includes: a second diode, one end of which is connected to one end of the first capacitor; an eleventh resistor, one end of which is connected to the other end of the second diode; and a tenth resistor, one end of which is connected to the other end of the eleventh resistor, and the other end of the tenth resistor is grounded.

[0015] In some embodiments, the optocoupler isolation module includes: a ninth resistor, one end of the ninth resistor is connected to a power supply; a third transistor, the base of the third transistor is connected to the other end of the eleventh resistor, and the emitter of the second transistor is grounded; an optocoupler isolator, a first end of the optocoupler isolator is connected to the other end of the ninth resistor, and a second end of the optocoupler isolator is connected to the collector of the third transistor; and a fifth resistor, one end of the fifth resistor is connected to the third end of the optocoupler isolator, and the other end of the fifth resistor is grounded.

[0016] In some embodiments, the current driving module includes: a first resistor, one end of which is connected to the control circuit; a first AND gate, a first input end of which is connected to the other end of the first resistor, and a second input end of which is connected to the third end of the optocoupler isolator.

[0017] In some embodiments, the second current judgment module comprises: a twenty-fourth resistor, one end of the twenty-fourth resistor being connected to the other end of the second resistor; a second operational amplifier, the non-inverting input terminal of the second operational amplifier being connected to the other end of the second resistor, the inverting input terminal of the second operational amplifier being connected to the other end of the twenty-fourth resistor, the power supply positive input terminal of the second operational amplifier being connected to a power supply, and the power supply negative input terminal of the second operational amplifier being grounded; and a third diode, one end of the third diode being connected to the output terminal of the second operational amplifier.

[0018] In some embodiments, the forward voltage driving module comprises: a fourth resistor, one end of the fourth resistor being connected to the other end of the third diode; a second AND gate, the first input terminal of the second AND gate being connected to the other end of the fourth resistor, and the second input terminal of the second AND gate being connected to the control circuit; a twenty-eighth resistor, one end of the twenty-eighth resistor being connected to the output terminal of the second AND gate; a first transistor, the base of the first transistor being connected to the other end of the twenty-eighth resistor, the collector of the first transistor being connected to an electrical appliance, the emitter of the first transistor being connected to the other end of the twenty-eighth resistor; a sixteenth resistor, one end of the sixteenth resistor being connected to the other end of the twenty-eighth resistor, and the other end of the sixteenth resistor being connected to the emitter of the first transistor; a voltage stabilizing diode, the cathode of the voltage stabilizing diode being connected to the emitter of the first transistor; a twelfth resistor, one end of the twelfth resistor being connected to the reference terminal of the voltage stabilizing diode, and the other end of the twelfth resistor being connected to the control circuit; a thirteenth resistor, one end of the thirteenth resistor being connected to the cathode of the voltage stabilizing diode, and the other end of the thirteenth resistor being connected to the reference terminal of the voltage stabilizing diode; a fourteenth resistor, one end of the fourteenth resistor being connected to the reference terminal of the voltage stabilizing diode, and the other end of the fourteenth resistor being connected to the anode of the voltage stabilizing diode; a seventeenth resistor, one end of the seventeenth resistor being connected to the anode of the voltage stabilizing diode, and the other end of the seventeenth resistor being grounded; and an eighteenth resistor, one end of the eighteenth resistor being connected to the anode of the voltage stabilizing diode, and the other end of the eighteenth resistor being connected to the control module.

[0019] In some embodiments, the second current acquisition module includes: a nineteenth resistor, one end of the nineteenth resistor is connected to the other end of the twenty-fourth resistor; a twentieth resistor, one end of the twentieth resistor is connected to the other end of the twenty-fourth resistor; a twenty-first resistor, one end of the twenty-first resistor is connected to the other end of the nineteenth resistor; a third operational amplifier, a non-inverting input terminal of the third operational amplifier is connected to the other end of the twentieth resistor, a reverse input terminal of the third operational amplifier is connected to the other end of the twenty-first resistor, a positive power input terminal of the third operational amplifier is connected to the power supply, a negative power input terminal of the third operational amplifier is grounded, and an output terminal of the third operational amplifier is connected to the control module; a twenty-third resistor, one end of the twenty-third resistor is connected to the non-inverting input terminal of the third operational amplifier, and the other end of the twenty-third resistor is grounded; a twenty-second resistor, one end of the twenty-second resistor is connected to the reverse input terminal of the third operational amplifier, and the other end of the twenty-second resistor is connected to the control module.

[0020] In some embodiments, the output signal amplification module includes: a fifth diode, one end of which is connected to the control module; a twenty-fifth resistor, one end of which is connected to the other end of the fifth diode; a fourth MOS transistor, a gate of which is connected to the other end of the twenty-fifth resistor, and a drain of which is connected to a power supply; a twenty-sixth resistor, one end of which is connected to the source of the fourth MOS transistor, and the other end of which is connected to the timing module; and a twenty-seventh resistor, one end of which is connected to the other end of the twenty-fifth resistor, and the other end of which is connected to one end of the twenty-sixth resistor.

[0021] In some embodiments, the control circuit includes: a first OR gate, wherein the first input end of the first OR gate is connected to the first current drive circuit for receiving a reverse drive signal and outputting a relay drive signal; the second input end of the first OR gate is connected to the forward voltage drive module for receiving a forward overvoltage delay drive signal and outputting a relay drive signal; the third input end and the fourth input end of the first OR gate are connected to the second current acquisition module for receiving a forward instant shutdown drive signal or a forward blocking drive signal and outputting a relay drive signal; a drive signal amplification module, wherein the drive signal amplification module is connected to the first OR gate for receiving and amplifying the relay drive signal and outputting the amplified relay drive signal; and a relay drive module, wherein the relay drive module is connected to the drive signal amplification module for receiving the amplified relay drive signal and controlling the on and off of the relay.

[0022] In some embodiments, the driving signal amplification module comprises: a first diode, one end of the first diode being connected to the first OR gate; a fifteenth resistor, one end of the fifteenth resistor being connected to the other end of the first diode; a sixth MOS tube, a gate of the sixth MOS tube being connected to the other end of the fifteenth resistor, a drain of the sixth MOS tube being connected to a power supply; a twenty-ninth resistor, one end of the twenty-ninth resistor being connected to a source of the sixth MOS tube, the other end of the twenty-ninth resistor being connected to the relay driving module; and a thirtieth resistor, one end of the thirtieth resistor being connected to the other end of the fifteenth resistor, the other end of the thirtieth resistor being connected to one end of the twenty-ninth resistor.

[0023] In some embodiments, the relay driving module comprises: a sixth resistor, one end of the sixth resistor being connected to the other end of the twenty-ninth resistor; a second transistor, a base of the second transistor being connected to the other end of the sixth resistor, a collector of the second transistor being connected to a second end of the relay, an emitter of the second transistor being grounded; a seventh resistor, one end of the seventh resistor being connected to the other end of the sixth resistor, the other end of the seventh resistor being grounded; and an eighth resistor, one end of the eighth resistor being connected to a power supply, the other end of the eighth resistor being connected to a third end of the relay.

[0024] In some embodiments, the control circuit of the relay further comprises: a battery connected to a fourth end of the relay, for outputting a driving current of the relay.

[0025] To achieve the above object, the second aspect of the embodiment of the utility model provides a vehicle, the vehicle comprising the control circuit of the relay.

[0026] According to the vehicle of the utility model embodiment, the control circuit receives the enable signal of the relay and the driving current of the relay sent by the current driving circuit, and outputs the control signal of the relay according to the driving current size and the enable requirement to control the relay to be closed or turned off, the on-off of the relay is changed by increasing the enable signal, the control circuit of the relay is avoided from being always in operation state, the probability of frequent failure of the relay is reduced, the stable operation and production safety are ensured, and the static consumption can also be reduced.

[0027] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0028] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0029] Figure 1 1 is a structural block diagram of a control circuit of a relay according to an embodiment of the present invention;

[0030] Figure 2 1 is a schematic structural diagram of a control circuit of a relay according to an embodiment of the present invention;

[0031] Figure 3 It is a structural block diagram of a vehicle according to an embodiment of the present utility model.

[0032] Reference numerals: control circuit 100 of relay;

[0033] Current driving circuit 101; control circuit 11;

[0034] First current judgment module 1; timing module 2; current enhancement module 3; optocoupler isolation module 4; current driving module 5;

[0035] Second current judging module 6; second current collecting module 7; output signal amplifying module 8;

[0036] Driving signal amplifying module 9; relay driving module 10; electrical appliance 12; battery 13;

[0037] Vehicle 110. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0039] In related technologies, in addition to the fast-charging relay, the BDU (Battery Drive Unit) of an electric vehicle will be subject to reverse current from inductive high-power electrical appliances when the power is disconnected. This voltage and current are generally higher than the peak voltage and peak current of the electrical appliance, which will reduce the service life of the relay when it is opened and closed. In the event of overcurrent and short circuit, the opening and closing of the relay will reduce the reliability of the relay or even damage it, and the user can only replace the relay.

[0040] The following combination Figures 1-2 The control circuit 100 of the relay of the present invention is described with an example.

[0041] like Figure 1 As shown, the control circuit 100 of the relay of the embodiment of the present invention includes: a current driving circuit 101 and a control circuit 11, wherein:

[0042] The current driving circuit 101 is connected with the relay K1 and is used for receiving the driving current of the relay K1; the control circuit 11 is connected with the current driving circuit 101 and is used for receiving the enable signal and the driving current of the relay, and outputting the control signal of the relay, wherein the driving current includes the forward driving current and the reverse driving current, and the enable signal is the demand signal of the main CPU (Central Processing Unit, central processor) or the main VCU (Vehicle control unit, whole vehicle control unit) for closing or shutting off the relay, for example, en1 and en2.

[0043] In the embodiment, the current driving circuit receives the driving current of the relay K1, and sends the driving current of the relay K1 to the control circuit 11, and meanwhile the control circuit 11 also receives the enable signal of the relay K1, and according to the size of the driving current and the enable demand for the relay K1, the control signal of the relay K1 is outputted together to control the relay K1 to be closed or shut off, and by acquiring the enable signal, the corresponding control is performed on the relay K1 only after the enable demand for the relay K1 is determined, so that the control circuit 100 of the relay is avoided to be always in the running state, thereby reducing the problems such as arc problem, poor contact or bottom fault, temperature rise, increase of contact resistance and reduction of service life of electrical elements, and further reducing the probability of sticking of the relay, and meanwhile reducing the static consumption of the control circuit 100 of the relay.

[0044] According to the control circuit 100 of the relay in the embodiment of the utility model, the control circuit 11 receives the enable signal of the relay K1 and the driving current of the relay K1 sent by the current driving circuit 101, and according to the size of the driving current and the enable demand, the control signal of the relay K1 is outputted together to control the relay K1 to be closed or shut off, and by increasing the enable signal to change the on-off of the relay K1, the control circuit 100 of the relay is avoided to be always in the running state, thereby reducing the probability of frequent faults of the relay K1, ensuring the stable operation and production safety, and meanwhile the static consumption can also be reduced.

[0045] In some embodiments, the current driving circuit 101 includes: a first current driving circuit and a second current driving circuit, wherein,

[0046] The first current driving circuit is connected with the relay K1 and is used for receiving the reverse driving current of the relay K1, and the control circuit 11 outputs the driving signal of the relay K1 according to the reverse driving current and the enable signal of the relay, so as to realize the time-delayed shutdown of the relay; the second current driving circuit is connected with the relay K1 and is used for receiving the forward driving current of the relay K1, and the control circuit 11 outputs the driving signal of the relay according to the forward driving current and the enable signal of the relay, so as to realize the time-delayed shutdown of the relay, or the immediate shutdown of the relay, or the prevention of the shutdown of the relay.

[0047] In some embodiments, as Figure 2 As shown, the first current driving circuit includes: a first current judgment module 1, a timing module 2, a current enhancement module 3, an optical coupling isolation module 4 and a current driving module 5, wherein,

[0048] One end of the first current judgment module 1 is connected to the first end of the relay K1; it is used to output the reverse driving current when receiving a high-level signal of the reverse driving current; one end of the timing circuit 2 is connected to the other end of the first current judgment module 1, and the other end of the timing circuit 2 is grounded, and is used to receive the reverse driving current and charge the timing module 2; one end of the current enhancement module 3 is connected to one end of the timing circuit, and is used to output the enhanced reverse driving current when receiving the preset voltage signal of the timing circuit 2; one end of the optocoupler isolation module 4 is connected to the other end of the current enhancement module 3, and is used to isolate the interference signal of the enhanced reverse driving current; one end of the current driving module 5 is connected to the control circuit 11, and the other end of the current driving module 5 is connected to the other end of the optocoupler isolation module 4, and is used to receive the enhanced reverse driving current and the enable signal, and output the reverse driving signal.

[0049] In an embodiment, after receiving the reverse drive current, the first current judgment module 1 determines whether the reverse drive current is at a high level. When receiving a high-level signal of the reverse drive current, the reverse drive current is output to the timing circuit 2; the timing circuit 2 is charged according to the reverse drive current, and when the real-time voltage value of the timing circuit 2 reaches a preset voltage threshold, it is output to the current enhancement module 3. The current enhancement module 3 performs signal enhancement on the reverse drive current and outputs the enhanced reverse drive current to the optocoupler isolation module 4 to isolate the interference signal in the enhanced reverse drive current, and outputs the screened enhanced reverse drive current to the current driving module 5. After receiving the enhanced reverse drive current, the current driving module 5 outputs a reverse drive signal C according to the enhanced reverse drive current and the enable signal.

[0050] In some embodiments, as Figure 2 As shown, the second current driving circuit includes: a second current judgment module 6 and a forward voltage driving module, wherein,

[0051] One end of the second current judgment module 6 is connected to the first end of the relay K1, and is used to output a forward driving current when receiving a high-level signal of the reverse driving current; the first end of the forward voltage driving module is connected to the other end of the second current judgment module 6, the second end of the forward voltage driving module is connected to the control circuit 11, and the third end of the forward voltage driving module is connected to the electrical appliance 12, and is used to receive the forward driving current, output the forward driving voltage, and output the forward overvoltage delay driving signal when receiving the preset voltage signal of the forward driving voltage.

[0052] In the embodiment, the second current judgment module 6 receives the forward driving current, judges whether the forward driving current is high level, and outputs the forward driving current to the forward voltage driving module when the forward driving current is high level. The forward voltage driving module receives the forward driving current, converts the forward driving current into forward driving voltage, and compares the size relationship between the forward driving voltage and the preset voltage signal in2. When the preset voltage signal receiving the forward driving voltage is considered as overvoltage, the forward overvoltage delay driving signal out4 is output to the control circuit 11. The preset voltage signal in2 can be reprogrammed through the io2 port, for example, TL432 program.

[0053] In some embodiments, as shown in Figure 2 The second current driving circuit further comprises a second current collection module 7 and an output signal amplification module 8.

[0054] One end of the second current collection module 7 is connected to the first end of the relay K1, and the other end of the second current collection module 7 is connected to the control circuit 11, for receiving the forward driving current, and outputting the overcurrent delay driving signal when the first preset current signal receiving the forward driving current, outputting the forward instant-off driving signal when the second preset current signal receiving the forward driving current, and outputting the forward blocking driving signal when the third preset current signal receiving the forward driving current. One end of the output signal amplification module 8 is connected to the control circuit 11, and the other end of the output signal amplification module 8 is connected to the timing module 2, for receiving and amplifying the overcurrent delay driving signal out1, and outputting the amplified overcurrent delay driving signal b.

[0055] In the embodiment, the second current collection module 7 starts to work after the second current driving circuit receives the forward driving current, receives the forward driving current, and compares the size relationship between the forward driving current and the preset current signal int1. When the first preset current signal receiving the forward driving current is considered as greater than the first preset current threshold, that is, the forward driving current is overcurrent, the control circuit 11 outputs the overcurrent delay driving signal out1 to the control circuit 11. The output signal amplification module 8 receives and amplifies the overcurrent delay driving signal out1, and outputs the amplified overcurrent delay driving signal b. When the second preset current signal receiving the forward driving current is considered as greater than the first preset current threshold and less than the second preset current threshold, that is, the forward driving current is normal, the forward instant-off driving signal out2 is output to the control circuit 11. When the third preset current signal receiving the forward driving current is considered as greater than the second preset current threshold, that is, the forward driving current is short-circuit, the control circuit 11 outputs the forward blocking driving signal out3 to the control circuit 11.

[0056] In some embodiments, as shown in Figure 2As shown, the first current judgment module 1 comprises: a second resistor R2, a first operational amplifier U2A, and a fourth diode D4, wherein,

[0057] One end of the second resistor R2 is connected to the first end of the relay K1; the non-inverting input end of the first operational amplifier U2A is connected to the first end of the relay K1, the inverting input end of the first operational amplifier U2A is connected to the other end of the second resistor R2, the power positive input end of the first operational amplifier U2A is connected to the power supply, and the power negative input end of the first operational amplifier U2A is grounded; one end of the fourth diode D4 is connected to the output end of the first operational amplifier U2A, and the other end of the fourth diode D4 is connected to one end of the timing circuit.

[0058] In the embodiment, when the first operational amplifier U2A receives the reverse driving current, the reverse driving current is amplified according to the amplification multiple received by the power positive and the power negative, and when the amplified reverse driving current is a high-level signal, the reverse driving current is output to the timing circuit 2.

[0059] In some embodiments, as shown in the figure, Figure 2 As shown, the timing module 2 comprises: a first capacitor C3 and a third resistor R3, wherein one end of the first capacitor C3 is connected to the other end of the fourth diode D4; one end of the third resistor R3 is connected to the other end of the first capacitor C3, and the other end of the third resistor R3 is grounded.

[0060] In the embodiment, after the timing circuit 2 receives the reverse driving current, the real-time voltage value of the first capacitor C3 is determined. Since the initial voltage difference of the first capacitor C3 is 0, the reverse driving current is preferentially charged to the first capacitor C3, and is grounded through the first capacitor C3 and the third resistor R3. When the real-time voltage value of the first capacitor C3 reaches the preset voltage threshold, it is considered that the first capacitor C3 is fully charged, and subsequent judgment can be performed. The timing circuit determines the resistance-capacitance ratio of the timing circuit by collecting the duration of the reverse driving current being reduced to the forward driving current each time the power is turned off, and the time required for the fuse in the circuit where the relay K1 is located to be blown when the circuit is short-circuited, so as to realize the delay function.

[0061] In some embodiments, as shown in the figure, Figure 2 As shown, the current enhancement module 3 comprises: a second diode D2, an eleventh resistor R11, and a tenth resistor R10, wherein one end of the second diode D2 is connected to one end of the first capacitor C3; one end of the eleventh resistor R11 is connected to the other end of the second diode D2; one end of the tenth resistor R10 is connected to the other end of the eleventh resistor R11, and the other end of the tenth resistor R10 is grounded.

[0062] In embodiments, the second diode D2 performs voltage clamping and unidirectional conduction, and since the potential at point b is floating, if the potential at point b is negative, current will flow from the ground below the tenth resistor R10, through the tenth resistor R10 and the eleventh resistor R11, back to point b.

[0063] In some embodiments, as shown in FIG. 4, the light-coupled isolation module 4 includes a ninth resistor R9, a third transistor Q3, a light-coupled isolator U1, and a fifth resistor R5, wherein, Figure 2

[0064] One end of the ninth resistor R9 is connected to a power supply; the base of the third transistor Q3 is connected to the other end of the eleventh resistor R11, and the emitter of the second transistor Q2 is grounded; the first end of the light-coupled isolator U1 is connected to the other end of the ninth resistor R9, and the second end of the light-coupled isolator U1 is connected to the collector of the third transistor Q3; one end of the fifth resistor R5 is connected to the third end of the light-coupled isolator U1, and the other end of the fifth resistor R5 is grounded.

[0065] In embodiments, the light-coupled isolator U1 utilizes the principle of photoelectric conversion isolation. After the light-sensitive diode circuit on the right side of the light-coupled isolator U1 is turned on, the brightness will be adjusted according to the current flowing through the light-sensitive diode. The light-sensitive triode on the left side will determine the opening degree of the triode on the left side according to the brightness of the light-sensitive diode shining on it, thereby adjusting the resistance value.

[0066] Specifically, the reverse driving current first charges the first capacitor C3. When the real-time voltage value of the first capacitor C3 reaches the preset voltage threshold, it can be divided into two paths, one path charges the first capacitor C3, and the other path flows into the ground through the second diode D2, the tenth resistor R10, and the eleventh resistor R11. Since the tenth resistor R10 and the eleventh resistor R11 have very high resistance, most of the reverse driving current is still used to charge the first capacitor C3. When the voltage difference across the first capacitor C3 reaches the sum of the driving voltage of the third transistor Q3, for example, 15V, and the conduction voltage of the second diode D2, for example, 0.7V, which is about 16V, the third transistor Q3 is fully turned on, and the brightness of the light-emitting diode inside the light-coupled isolator U1 can be maximized to turn on the light-sensitive triode. After the relay K1 is actuated, the discharge circuit of the first capacitor C3 is completed by flowing from the first capacitor C3 through the second diode D2, the eleventh resistor R11, the tenth resistor R10, and then into the ground.

[0067] In some embodiments, as shown in FIG. 4, the light-coupled isolation module 4 includes a ninth resistor R9, a third transistor Q3, a light-coupled isolator U1, and a fifth resistor R5, wherein, Figure 2 ​As shown, the current driving module 5 includes: a first resistor R1 and a first AND gate U4, wherein one end of the first resistor R1 is connected to the control circuit 11; the first input end of the first AND gate U4 is connected to the other end of the first resistor R1, and the second input end is connected to the third end of the optocoupler isolator U1. After receiving the enhanced reverse driving current, the first AND gate U4 outputs a reverse driving signal C according to the enhanced reverse driving current and the enable signal sent by the control circuit 11.

[0068] In some embodiments, as Figure 2 As shown, the second current judgment module 6 includes: a twenty-fourth resistor R24, a second operational amplifier U5A, and a third diode D3, wherein:

[0069] One end of the twenty-fourth resistor R24 ​​is connected to the other end of the second resistor R2; the non-inverting input end of the second operational amplifier U5A is connected to the other end of the second resistor R2, the inverting input end of the second operational amplifier U5A is connected to the other end of the twenty-fourth resistor R24, the positive power input end of the second operational amplifier U5A is connected to the power supply, and the negative power input end of the second operational amplifier U5A is grounded; one end of the third diode D3 is connected to the output end of the second operational amplifier U5A.

[0070] In an embodiment, when the second operational amplifier U5A receives a forward drive current, it amplifies the forward drive current according to the amplification factors received by the positive phase and negative phase of the power supply, and outputs the forward drive current to the timing circuit 2 when the amplified forward drive current is a high-level signal.

[0071] In some embodiments, as Figure 2 As shown, the forward voltage driving module includes: a fourth resistor R4, a second AND gate U8, a twenty-eighth resistor R28, a first transistor Q1, a sixteenth resistor R16, a voltage stabilizing diode D6, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a seventeenth resistor R17, and an eighteenth resistor R18, wherein,

[0072] One end of the fourth resistor R4 is connected to the other end of the third diode D3; the first input end of the second AND gate U8 is connected to the other end of the fourth resistor R4, and the second input end of the second AND gate U8 is connected to the control circuit 11; one end of the twenty-eighth resistor R28 is connected to the output end of the second AND gate U8; the base of the first transistor Q1 is connected to the other end of the twenty-eighth resistor R28, and the collector of the first transistor Q1 is connected to the electrical appliance 12; one end of the sixteenth resistor R16 is connected to the other end of the twenty-eighth resistor R28, and the other end of the sixteenth resistor R16 is connected to the emitter of the first transistor Q1; the cathode of the voltage stabilizing diode D6 is connected to the emitter of the first transistor Q1; the twelfth resistor One end of R12 is connected to the reference end of the Zener diode D6, and the other end of the twelfth resistor R12 is connected to the control circuit 11; one end of the thirteenth resistor R13 is connected to the cathode of the Zener diode D6, and the other end of the thirteenth resistor R13 is connected to the reference end of the Zener diode D6; one end of the fourteenth resistor R14 is connected to the reference end of the Zener diode D6, and the other end of the fourteenth resistor R14 is connected to the anode of the Zener diode D6; one end of the seventeenth resistor R17 is connected to the anode of the Zener diode D6, and the other end of the seventeenth resistor R17 is grounded; one end of the eighteenth resistor R18 is connected to the anode of the Zener diode D6, and the other end of the eighteenth resistor R18 is connected to the control module.

[0073] In some embodiments, as Figure 2 As shown, the second current acquisition module 7 includes: a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a third operational amplifier U10A, a twenty-third resistor R23, and a twenty-second resistor R22, wherein:

[0074] One end of the nineteenth resistor R19 is connected to the other end of the twenty-fourth resistor R24; one end of the twentieth resistor R20 is connected to the other end of the twenty-fourth resistor R24; one end of the twenty-first resistor R21 is connected to the other end of the nineteenth resistor R19; the non-inverting input end of the third operational amplifier U10A is connected to the other end of the twentieth resistor R20, the inverting input end of the third operational amplifier U10A is connected to the other end of the twenty-first resistor R21, the positive power input end of the third operational amplifier U10A is connected to the power supply, the negative power input end of the third operational amplifier U10A is grounded, and the output end of the third operational amplifier U10A is connected to the control module; one end of the twenty-third resistor R23 is connected to the non-inverting input end of the third operational amplifier U10A, and the other end of the twenty-third resistor R23 is grounded; one end of the twenty-second resistor R22 is connected to the inverting input end of the third operational amplifier U10A, and the other end of the twenty-second resistor R22 is connected to the control module.

[0075] In some embodiments, as Figure 2As shown, the output signal amplifying module 8 includes: a fifth diode D5, a twenty-fifth resistor R25, a fourth MOS transistor Q4, a twenty-sixth resistor R26, and a twenty-seventh resistor R27, wherein:

[0076] One end of the fifth diode D5 is connected to the control module; one end of the twenty-fifth resistor R25 is connected to the other end of the fifth diode D5; the gate of the fourth MOS transistor Q4 is connected to the other end of the twenty-fifth resistor R25, and the drain of the fourth MOS transistor Q4 is connected to the power supply; one end of the twenty-sixth resistor R26 is connected to the source of the fourth MOS transistor Q4, and the other end of the twenty-sixth resistor R26 is connected to the timing module 2; one end of the twenty-seventh resistor R27 is connected to the other end of the twenty-fifth resistor R25, and the other end of the twenty-seventh resistor R27 is connected to one end of the twenty-sixth resistor R26.

[0077] In the embodiment, the fifth diode D5 uses the unidirectional conductivity of the diode to prevent the current from flowing in the reverse direction. Since the voltage and current of the enable signal sent by the control circuit are very low, it cannot provide energy for the first capacitor C3 and cannot realize the delay function, so power amplification is required.

[0078] In some embodiments, as Figure 2 As shown, the control circuit 11 includes: a first OR gate U3, a drive signal amplifying module 9 and a relay drive module 10, wherein,

[0079] The first input end of the first OR gate U3 is connected to the first current driving circuit, and is used to receive the reverse driving signal C and output the relay driving signal e to achieve delayed shutdown of the relay. The second input end of the first OR gate U3 is connected to the forward voltage driving module, and is used to receive the forward overvoltage delayed driving signal out4 and output the relay driving signal e to achieve delayed shutdown of the relay. The third input end and the fourth input end of the first OR gate U3 are connected to the second current acquisition module 7, and are used to receive the forward instant shutdown driving signal out2 or the forward blocking driving signal out3, and output the relay driving signal e to achieve instant shutdown of the relay or block shutdown of the relay; the driving signal amplifying module 9 is connected to the first OR gate U3, and is used to receive and amplify the relay driving signal e, and output the amplified relay driving signal, for example, recorded as a; the relay driving module 10 is connected to the driving signal amplifying module 9, and is used to receive the amplified relay driving signal a to control the on and off of the relay K1.

[0080] In some embodiments, as Figure 2 As shown, the driving signal amplifying module 9 includes: a first diode D1, a fifteenth resistor R15, a sixth MOS transistor Q6, a twenty-ninth resistor R29, and a thirtieth resistor R30, wherein:

[0081] One end of the first diode D1 is connected to the first OR gate U3; one end of the fifteenth resistor R15 is connected to the other end of the first diode D1; the gate of the sixth MOS tube Q6 is connected to the other end of the fifteenth resistor R15, the drain of the sixth MOS tube Q6 is connected to the power supply; one end of the twenty-ninth resistor R29 is connected to the source of the sixth MOS tube Q6, and the other end of the twenty-ninth resistor R29 is connected to the relay driving module 10; one end of the thirtieth resistor R30 is connected to the other end of the fifteenth resistor R15, and the other end of the thirtieth resistor R30 is connected to one end of the twenty-ninth resistor R29.

[0082] In the embodiment, the first diode D1 prevents the current from flowing reversely by using the diode unidirectional conductivity, and the relay K1 needs a fixed current to flow through the coil inside the relay K1, and the current of the general signal level is very small and cannot directly drive the relay K1.

[0083] In some embodiments, as shown in Figure 2 The relay driving module 10 comprises: a sixth resistor R6, a second transistor Q2, a seventh resistor R7, and an eighth resistor R8, wherein,

[0084] One end of the sixth resistor R6 is connected to the other end of the twenty-ninth resistor R29; the base of the second transistor Q2 is connected to the other end of the sixth resistor R6, the collector of the second transistor Q2 is connected to the second end of the relay K1, and the emitter of the second transistor Q2 is grounded; one end of the seventh resistor R7 is connected to the other end of the sixth resistor R6, and the other end of the seventh resistor R7 is grounded; one end of the eighth resistor R8 is connected to the power supply, and the other end of the eighth resistor R8 is connected to the third end of the relay K1.

[0085] In some embodiments, as shown in Figure 3 The control circuit 100 of the relay further comprises a battery 13 connected to the fourth end of the relay K1 and used for outputting a driving current of the relay K1, wherein the driving current comprises a reverse driving current or a forward driving current.

[0086] According to the control circuit 100 of the relay in the embodiment of the utility model, the control circuit 11 receives the enable signal of the relay K1 and the driving current of the relay K1 sent by the current driving circuit 101, and outputs the control signal of the relay K1 according to the driving current size and the enable requirement to control the relay K1 to be closed or turned off, the on-off of the relay K1 is changed by increasing the enable signal, the control circuit 100 of the relay is always in operation state, thereby the probability of frequent failure of the relay K1 is reduced, the stable operation and production safety are ensured, and the static consumption is also reduced.

[0087] The vehicle 110 of the embodiment of the utility model will be described below. Figure 3 The vehicle 110 of the embodiment of the utility model will be described below.

[0088] As ​ shown, the vehicle 110 includes the control circuit 100 of the relay of the above embodiment.

[0089] According to the vehicle 110 of the embodiment of the present application, the control circuit 11 receives the enable signal of the relay K1 and the driving current of the relay K1 sent by the current driving circuit 101, and outputs the control signal of the relay K1 according to the driving current size and the enable requirement to control the relay K1 to close or shut off, and changes the on-off of the relay K1 by increasing the enable signal, avoids the control circuit 100 of the relay to be always in operation state, thereby reducing the probability of frequent failure of the relay K1, ensuring its stable operation and production safety, and also reducing the static consumption.

[0090] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example.

[0091] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A control circuit of a relay, characterized in that: include: a current driving circuit connected to the relay and configured to receive a driving current of the relay, wherein the current driving circuit comprises: a first current driving circuit connected to the relay and configured to receive a reverse driving current of the relay; and a second current driving circuit connected to the relay and configured to receive a forward driving current of the relay; The control circuit is connected to the current driving circuit, and is used to receive the enable signal of the relay and the driving current, and output a control signal of the relay.

2. The control circuit of the relay according to claim 1, characterized in that: The first current driving circuit includes: a first current judgment module, one end of which is connected to the first end of the relay; and configured to output a reverse driving current when receiving a high-level signal of the reverse driving current; a timing module, one end of which is connected to the other end of the first current determination module, the other end of which is grounded, and is configured to charge the timing module after receiving the reverse drive current; a current enhancement module, one end of which is connected to one end of the timing module and configured to output an enhanced reverse driving current when receiving a preset voltage signal from the timing module; an optocoupler isolation module, one end of which is connected to the other end of the current enhancement module, for isolating the interference signal of the enhanced reverse drive current; A current driving module, one end of which is connected to the control circuit, and the other end of which is connected to the other end of the optocoupler isolation module, is used to receive the enhanced reverse driving current and the enable signal and output a reverse driving signal.

3. The control circuit of the relay according to claim 2, characterized in that: The second current driving circuit includes: a second current judgment module, one end of which is connected to the first end of the relay, and is configured to output a forward driving current when receiving a high level signal of the reverse driving current; A forward voltage driving module, wherein the first end of the forward voltage driving module is connected to the other end of the second current judgment module, the second end of the forward voltage driving module is connected to the control circuit, and the third end of the forward voltage driving module is connected to the electrical appliance, and is used to receive the forward driving current, output the forward driving voltage, and output the forward overvoltage delay driving signal when receiving the preset voltage signal of the forward driving voltage.

4. The control circuit of the relay according to claim 3, characterized in that: The second current driving circuit further includes: a second current acquisition module, one end of the second current acquisition module being connected to the first end of the relay, and the other end of the second current acquisition module being connected to the control circuit, and being configured to receive the forward drive current, and output an overcurrent delay drive signal when receiving a first preset current signal of the forward drive current, output a forward instant shutdown drive signal when receiving a second preset current signal of the forward drive current, and output a forward blocking drive signal when receiving a third preset current signal of the forward drive current; An output signal amplifying module, one end of which is connected to the control circuit, and the other end of which is connected to the timing module, is used to receive and amplify the overcurrent delay driving signal and output the amplified overcurrent delay driving signal.

5. The control circuit of the relay according to claim 2, characterized in that: The first current judgment module includes: a second resistor, one end of the second resistor being connected to the first end of the relay; a first operational amplifier, wherein a non-inverting input terminal of the first operational amplifier is connected to the first end of the relay, an inverting input terminal of the first operational amplifier is connected to the other end of the second resistor, a power supply positive input terminal of the first operational amplifier is connected to a power supply, and a power supply negative input terminal of the first operational amplifier is grounded; A fourth diode, one end of the fourth diode is connected to the output end of the first operational amplifier, and the other end of the fourth diode is connected to one end of the timing module.

6. The control circuit of the relay according to claim 5, characterized in that: The timing module includes: a first capacitor, one end of the first capacitor being connected to the other end of the fourth diode; a third resistor, one end of the third resistor being connected to the other end of the first capacitor, and the other end of the third resistor being grounded.

7. The control circuit of the relay according to claim 3, characterized in that: The control circuit comprises: a first OR gate, wherein a first input terminal of the first OR gate is connected to the first current driving circuit, and is used to receive a reverse driving signal and output a relay driving signal; a second input terminal of the first OR gate is connected to the forward voltage driving module, and is used to receive a forward overvoltage delay driving signal and output a relay driving signal; a third input terminal and a fourth input terminal of the first OR gate are connected to the second current acquisition module, and are used to receive a forward instant shutdown driving signal or a forward blocking driving signal and output a relay driving signal; a driving signal amplifying module, connected to the first OR gate, configured to receive and amplify the relay driving signal and output the amplified relay driving signal; The relay driving module is connected to the driving signal amplifying module and is used to receive the amplified relay driving signal and control the on and off of the relay.

8. The control circuit of the relay according to claim 1, characterized in that: The control circuit of the relay also includes: A battery is connected to the fourth end of the relay and is used to output a driving current of the relay.

9. A vehicle, characterized in that: include: A control circuit for a relay as claimed in any one of claims 1 to 8.

Images