CN105742119A - Relay driving circuit - Google Patents
Relay driving circuit Download PDFInfo
- Publication number
- CN105742119A CN105742119A CN201510983427.2A CN201510983427A CN105742119A CN 105742119 A CN105742119 A CN 105742119A CN 201510983427 A CN201510983427 A CN 201510983427A CN 105742119 A CN105742119 A CN 105742119A
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- Prior art keywords
- switch element
- relay
- switch
- fault
- drive circuit
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Classifications
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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
- H01H47/002—Monitoring or fail-safe circuits
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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
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
-
- 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
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H2047/025—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay with taking into account of the thermal influences, e.g. change in resistivity of the coil or being adapted to high temperatures
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- Relay Circuits (AREA)
Abstract
The invention provides a relay driving circuit. In an electrical path for a coil current (i21) to flow through the electrical coil (21) of a relay (20), two switching elements (11A, 12A) are arranged in the series-connected state, and a CPU (14) controls the on/off states of the two switching elements (11A, 12A) at the same time so as to control the electrification state. Since the two switching elements (11A, 12A) do not break down at the same time, the coil current (i21) can be reliably cut off even during the occurrence of a fault. Therefore, the long-term continuous electrification is avoided. Based on the above mechanism, the occurrence of flames and fires caused by the abnormal temperature rise can be avoided. The relay driving circuit has the fault automatic-diagnosis function and can report the occurrence of a fault in the event of the fault.
Description
Technical field
The present invention relates to the relay drive circuit for driving the various relays being mounted in vehicle etc., particularly to the technology for safety measure.
Background technology
Such as, to the such load of motor switch power supply opening/closing time, generally use mechanical relay.That is, use the switch contact of relay that the connection between power supply and earth lead and load is carried out open and close controlling.Mechanical relay can utilize the switching of the energising of electric coil/non-energized to make movable part move, and switches the open and-shut mode of switch contact.In order to so switch the energising of the electric coil of relay/non-energized, use relay drive circuit.
Prior art about such relay drive circuit, it is known that such as patent documentation 1～patent documentation 5.
Patent documentation 1 illustrates the technology relevant to the drive circuit of the relay that can reduce power consumption.Specifically, by the electric coil of multiple switch elements in series to relay, and use delay cell, the timing control driving multiple switch elements is made and offsets one from another.
Patent documentation 2 illustrates for suppressing the spontaneous heating that coil current causes in relay drive circuit and the technology making not produce abnormal sound.Specifically, use variable voltage adjustor, or controlled by the PWM of electric current, carry out the size of current of flowing in the electric coil of regulating relay.
The technology that patent documentation 3 is shown below: in the vehicle power source device of control point ignition source, though for when driving the broken string of system of IG relay, low-voltage time continue to Guan Bi (on) priming supply and then prevent the scaling loss of the printed base plate etc. caused because of overcurrent.
Patent documentation 4 illustrates the technology relevant to the relay controller of the heating controlling relay.Specifically, it is configured to: utilize the voltage stabilization circuit employing Zener diode, adjusts the output voltage of transistor 156, and the voltage being applied to the electric coil of relay remains predetermined value.
The technology that patent documentation 5 is shown below: after closing relay, even if still be able to the state of guard relay when the voltage driving power supply reduces, and can the relay drive circuit of power saving.Specifically, by the be used for making relay contact work the 1st switch 7, the duty being used for guard relay contact the 2nd switch in parallel to relay coil 3, and when applying voltage and being reduced to below threshold value by the 1st on-off control for closing.
Prior art literature
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2010-251200 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2011-216229 publication
Patent documentation 3: Japanese Unexamined Patent Publication 2012-183901 publication
Patent documentation 4: Japanese Unexamined Patent Publication 2013-171773 publication
Patent documentation 5: Japanese Unexamined Patent Publication 2014-116197 publication
Summary of the invention
Invention is intended to solve the technical problem that
But, for instance drive the motor of the various Denso equipment (such as motorized window) being mounted in vehicle to have the tendency needing bigger source current.Therefore, even the relay used to control the energising of such load, it is also desirable to contact, jumbo source current can be switched.
Therefore, the relay for using in such control, it is contemplated that: the resistance value of electric coil built-in in relay is reduced to flow super-high-current, and the captivation being used in the movable part of mobile relay increases, in order to reliably on-off switch contact.
But, if electric coil stream super-high-current built-in in relay, then this electric coil generates heat in a large number, it is impossible to avoid temperature to rise rapidly.If such temperature is increased beyond heat-resisting allowed band, then there is deterioration or destroyed in the skin that covers of electric coil, there is the probability occurring to cause the dead short of circuit because of defective insulation.It addition, in this case, it is also possible to it is contemplated that worst it may be the case that smolder, catch fire.It addition, when improving the thermostability of relay, the probability that relay maximizes or component costs increases is higher.
Therefore, for the relay used in the energising control of the load at various electrical equipments, the upper limit (such as, the longest 1 minute) of the continuous conduction time of electric coil in some situations, is defined.Therefore, when the electric coil of relay is energized, it is necessary to be controlled such that continuous conduction time is not elongated.Such as, when the such load of the motor driving motorized window, reality need not be energized continuously for a long time, therefore, for controlling the electric coil of the relay of this energising, the state of long-time energising generally also will not occur continuously.
But, it is also contemplated that following probability: such as there occurs in situation as fault (being fixed on closure state) at the switch element (such as transistor) of the parts as relay drive circuit, the electric coil of relay is energized for a long time continuously.It addition, for the fault of the parts such as quasiconductor, be inevitable with certain probability.When such fault, it is possible to detect this fault.But, even if the fault of detecting, actually also have can not the situation of energising of electric coil of block system relay, he therefore, worries to be likely to cause smoldering, catching fire because of the heating of the electric coil of relay.
The present invention completes in view of the foregoing, even if its objective is to provide a kind of when the parts such as quasiconductor there occurs fault, it is also possible to prevent the electric coil of relay from becoming the relay drive circuit of "on" position for a long time continuously.
For solving the technological means of problem
To achieve these goals, the relay drive circuit that the present invention relates to is with following (1)～(5) for feature.
(1) a kind of relay drive circuit, it is characterised in that possess:
Relay, it comprises the electric coil of the restriction with continuous conduction time；
1st switch element, it is configured in the electrical path of described electric coil of described relay；
2nd switch element, it is arranged in described electrical path with the state with described 1st switch elements in series；And
Energising control portion, it is when to make described electric coil be "on" position, control to be closure state by described 1st switch element and described both 2nd switch elements, when being non-power status making described electric coil, described 1st switch element and described both 2nd switch elements are switched to off-state.
(2) relay drive circuit according to above-mentioned (1), it is characterised in that
Described 1st switch element and described 2nd switch element are the semiconductor switch being respectively provided with control input terminal, and have diverse composition each other.
(3) relay drive circuit according to above-mentioned (2), it is characterised in that
Described 2nd switch element is connected the position leaning on hot side than described 1st switch element,
Described relay drive circuit is also equipped with the 3rd switch element, and described 3rd switch element controls the current potential of the control input terminal of described 2nd switch element.
(4) relay drive circuit according to above-mentioned (3), it is characterised in that
Possess multiple described 1st switch element and multiple described 2nd switch element,
The lead-out terminal of described 3rd switch element is universally connected to the control input terminal of multiple described 2nd switch element.
(5) relay drive circuit according to any one of above-mentioned (1)～(4), it is characterized in that, it is also equipped with fault monitoring portion, described fault monitoring portion is at least when to make described electric coil be non-power status, monitor the current potential between described 1st switch element and described 2nd switch element, identify there is fault-free.
The relay drive circuit of the composition according to above-mentioned (1), utilize the series circuit of described 1st switch element and described 2nd switch element, the energising of the described electric coil of described relay is closed/disconnects, therefore, even if the one in described 1st switch element and described 2nd switch element there occurs fault, if another one controlled as disconnecting, then can be assuredly shut off the energising of described electric coil.Therefore, it is possible to prevent from the continuous conduction time of described electric coil from exceeding setting, and stop that heating causes smolder, catch fire.Further, since under normal circumstances 2 switch elements can not simultaneous faults, therefore, it is possible to reliably stop what cause because of the heating of described electric coil to smolder, catch fire.Additionally, it is not necessary to the thermostability improving described electric coil is just prevented from smoldering, catching fire, therefore, it is possible to avoid the rising of the maximization of relay, component costs.
The relay drive circuit of the composition according to above-mentioned (2), uses semiconductor switch, therefore, it is possible to prevent movable part, electrical contact from increasing, reliability improves.It addition, by adopting the semiconductor switch of composition of kind different from each other to be used as described 1st switch element and described 2nd switch element, even if thus when being connected in series, it is also possible to carry out reliable switch motion.
The relay drive circuit of the composition according to above-mentioned (3), by controlling described 3rd switch element such that it is able to reliably switch the Guan Bi/disconnection of described 2nd switch element.
The relay drive circuit of the composition according to above-mentioned (4), by possessing multiple described 1st switch element and multiple described 2nd switch element such that it is able to control multiple relay respectively.It addition, described 3rd switch element quantity can not be increased just control multiple relay.
The relay drive circuit of the composition according to above-mentioned (5), when in there occurs described 1st switch element and described 2nd switch element, any one is fixed such malfunction with closure state, it is possible to detect this fault.It is therefore prevented that placed by the state there occurs fault, and the enforcement of repairing can be urged before remaining normal switch element failure, therefore, it is possible to will smolder, and catch fire and prevent trouble before it happens.
Invention effect
Relay drive circuit according to the present invention, even if when the parts such as quasiconductor there occurs fault, it is also possible to prevents the electric coil of relay from becoming "on" position continuously for a long time.Therefore, even if when adopting the relay of electric coil comprising the restriction with continuous conduction time, it is also possible to avoid smoldering when fault, catching fire.
Above, the present invention has been carried out brief description.And, with reference to accompanying drawing, read over following description for the embodiment that carries out an invention (hereinafter referred to as " embodiment ".), so that the details of the present invention is definitely.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the composition of the major part of the vehicle mounted electric assembling device illustrating the relay drive circuit comprising the 1st embodiment.
Fig. 2 is the sequential chart of the action example illustrating the relay drive circuit shown in Fig. 1.
Fig. 3 is the circuit diagram of the composition of the major part of the vehicle mounted electric assembling device illustrating the relay drive circuit comprising the 2nd embodiment.
Fig. 4 is the flow chart illustrating the diagnostic action in the relay drive circuit shown in Fig. 3.
Fig. 5 is the circuit diagram of the composition of the major part of the vehicle mounted electric assembling device illustrating the relay drive circuit comprising the 3rd embodiment.
Description of reference numerals
10,10B, 10C relay drive circuit
11A, 11B switch element
12A, 12B, 12C, 12D switch element
13 switch elements
14 microcomputers
14a, 14b, 14c, 14f output port
14d, 14e analog input end mouth
15A, 15B distribution
16A, 16B distribution
17A, 17B connect terminal
18A, 18B distribution
20 relays
21,22 electric coil
23,24 switch
30 dc motors
31,32 terminal
40 power lines
41 earth leads
45,46 connect terminal
50 display
100 vehicle mounted electric assembling devices
R11, R12, R13, R14, R15, R16 resistor
R21, R22, R23, R24 resistor
D1, D2, D3 diode
I21, i22 coil current
I30 motor current
SGA, SGB, SGC control signal
VdA, VdB monitor object voltage
Detailed description of the invention
For the detailed description of the invention relevant to the relay drive circuit of the present invention, illustrate referring to accompanying drawing.
< the 1st embodiment >
The configuration example of the major part of the vehicle mounted electric assembling device 100 of the relay drive circuit 10 comprising the 1st embodiment is illustrated in Fig. 1.
< brief description >
Concrete example as the vehicle mounted electric assembling device 100 shown in Fig. 1, it is possible to imagination electric window device.In order to make movable part that the such weight of glass pane is bigger smooth and easy and be quickly removed, such vehicle mounted electric assembling device 100 needs to flow through bigger electric current in as the dc motor 30 of drive source.
Additionally, the relay 20 that the energising/non-energized of the dc motor 30 in order to control vehicle mounted electric assembling device 100 is used, needs switch 23,24 reliably carries out the Guan Bi/disconnection (opening and closing of contact) of big electric current, it is necessary to use the electric coil 21,22 that resistance value is less.Therefore, in the electric coil 21,22 of relay 20, flowing through bigger electric current, the caloric value of electric coil 21,22 also becomes big.If it addition, be energized for a long time continuously in electric coil 21,22, then they can occur significant temperature to rise, it is possible to insulation cover skin destroyed while, smolder, catch fire.Therefore, particularly when not having relay 20 of higher heat resistance, the higher limit (such as 1 minute) of the continuous conduction time of electric coil 21,22 is prescribed in advance.
Action accordingly, with respect to relay drive circuit 10, it is necessary to consider that the continuous conduction time of electric coil 21,22 not can exceed that setting.But, in general relay drive circuit, there occurs in situation as fault at internal part, it is likely to carry out unexpected action, such as, even if when being non-energized by electric coil 21,22 control, being actually likely to continuously flow through electric current in electric coil 21,22.In the relay drive circuit 10 shown in Fig. 1, implement special improvement so that even if parts there occurs fault, the continuous conduction time of electric coil 21,22 is not over setting.
The detailed description > that < is constituted
< relay 20, dc motor 30 explanation >
Relay 20 shown in Fig. 1 is built-in with 2 group relaies of action independently of each other.That is, a group relay is made up of electric coil 21 and switch 23, and another group relay is made up of electric coil 22 and switch 24.It is to say, utilize the energising of electric coil 21/non-energized, make the movable part of switch 23 move, switch electrical contact.It addition, the energising of utilization switch 23/non-energized, make the movable part of switch 24 move, switch electrical contact.
Relay 20 be the energising in order to switch dc motor 30 Guan Bi/disconnection and energising direction and arrange.When the state shown in Fig. 1, namely switch 23 and 24 simultaneously switch off, the terminal 31 of dc motor 30 is connected to earth lead 41 (4) via connection terminal 45 and switch 23, terminal 32 is also connected to earth lead 41 (4) via connection terminal 46 and switch 24, and therefore do not flow motor current i30.
On the other hand, when switch 23 Guan Bi of relay 20, switch 24 disconnection, it is formed for making motor current i30 be flowed to the paths of earth lead 41 (4) by switch 23, connection terminal 45, terminal 31, dc motor 30, terminal 32, connection terminal 46 and switch 24 from power line (such as, supplying the voltage of+12V) 40.
Additionally, when switch 23 disconnects, switchs 24 Guan Bi, it is formed for making reciprocal motor current i30 by switch 24, connection terminal 46, terminal 32, dc motor 30, terminal 31, connection terminal 45 and switch 23 paths flowed to earth lead 41 (4) from power line 40.
For an electric coil 21 of relay 20, the terminal of hot side is connected to power line 40 via diode D3, and the terminal of low potential side is connected to the connection terminal 17A of relay drive circuit 10 output.It addition, for another electric coil 22 of relay 20, the terminal of hot side is connected to power line 40 via diode D3, the terminal of low potential side is connected to the connection terminal 17B of relay drive circuit 10 output.
Therefore, by controlling the current potential connecting terminal 17A of relay drive circuit 10 output such that it is able to the energising of the electric coil 22 of switching relay 20/non-energized, by controlling to connect the current potential of terminal 17B such that it is able to the energising of switching electric coil 22/non-energized.
The composition > of < relay drive circuit 10
Relay drive circuit 10 shown in Fig. 1 possesses: switch element 11A and 11B, switch element 12A and 12B, switch element 13, microcomputer (CPU) 14, resistor R11～R16, resistor R21～R24, diode D1 and D2.
The switch element 11A and switch element 12A that are configured in upside are the loops for controlling to connect the current potential of terminal 17A, are connected in series to the path of coil current i21.It addition, the switch element 11B and switch element 12B that are configured in downside are the loops for controlling to connect the current potential of terminal 17B, it is connected in series to the path of coil current i22.Switch element 13 is the switch of the Guan Bi/disconnection of the switch element 12B for the switch element 12A and downside universally controlling upside.
In the relay drive circuit 10 shown in Fig. 1, in order to easily realize reliable switch, as switch element 11A and 11B, adopt the MOSFET (FET) of N ditch type.It addition, as switch element 12A and 12B, adopt PNP transistor, as switch element 13, adopt NPN transistor.
Microcomputer 14 is by performing the program being previously charged into, thus realizing the control function required for vehicle mounted electric assembling device 100.Such as, output according to not shown upper electronic control unit (ECU) or export " rotating forward indication signal " and " reversion indication signal " according to being utilized button that user is operable to, exports control signal SGA, SGB and SGC respectively to each output port 14a, 14b and 14c.
Control signal SGA is the signal of the Guan Bi/disconnection for switching switch element 11A, is applied to the gate control terminal 11Ag of switch element 11A via resistor R12 from output port 14a.Control signal SGB is the signal of the Guan Bi/disconnection of switching switch element 11B, is applied to the gate control terminal 11Bg of switch element 11B via resistor R22 from output port 14b.Control signal SGC is the signal for closing/disconnect switch element 13, switch element 12A and 12B, is applied to the base stage control terminal of switch element 13 via resistor R16 from output port 14c.
It addition, be connected with earth lead 41 (1) for switch element 11A, source terminal 11As, drain terminal 11Ad is connected by the collector terminal 12Ac with switch element 12A via distribution 16A.Similarly, for switch element 11B, source terminal is connected with earth lead 41 (2), and drain terminal is connected by the collector terminal with switch element 12B via distribution 16B.
The base terminal 12Ab of switch element 12A is connected with the collector terminal of switch element 13 via resistor R14.Similarly, the base stage control terminal of switch element 12B is also connected with the collector terminal of switch element 13 via resistor R24.
It addition, be connected between the base terminal 12Ab and emitter terminal 12Ae of switch element 12A resistor R13, emitter terminal 12Ae via distribution 15A be connected terminal 17A connect.Similarly, between base stage control terminal and the emitter terminal of switch element 12B, be connected to resistor R23, emitter terminal via distribution 15B be connected terminal 17B connect.
The path of the coil current i21 flowing through the electric coil 21 of relay 20 is as follows.Namely, electric current is from power line 40, by diode D3, electric coil 21, connecting terminal 17A, distribution 15A, switch element 12A (emitter stage-inter-collector), distribution 16A, switch element 11A (between Drain-Source), stream arrives earth lead 41 (1).Wherein, in switch element 11A and switch element 12A, at least one disconnects, coil current i21 is cut off.
It addition, the path flowing through the coil current i22 of the electric coil 22 of relay 20 is as follows.Namely, electric current is from power line 40, by diode D3, electric coil 22, connect terminal 17B, distribution 15B, switch element 12B (emitter stage-inter-collector), distribution 16B, switch element 11B (between Drain-Source), flow to earth lead 41 (2).Wherein, when in switch element 11B and switch element 12B, at least one disconnects, coil current i22 is cut off.
The explanation > of < action
The action of the relay drive circuit 10 shown in Fig. 1 is illustrated for Fig. 2.
< original state and halted state >
Microcomputer 14 disconnects (low level: close to the voltage of earthing potential) to control signal SGA, SGB and SGC of each output port 14a～14c output.The situation of halted state is too.
When control signal SGA disconnects, the potential difference between the gate control terminal 11Ag and source terminal 11As of switch element 11A diminishes, and becomes non-conduction (disconnection) between the drain terminal 11Ad and source terminal 11As of switch element 11A.Similarly, when control signal SGB disconnects, the potential difference between gate control terminal and the source terminal of switch element 11B diminishes, and becomes non-conduction (disconnection) between drain terminal and the source terminal of switch element 11B.
It addition, when control signal SGC disconnects, the potential difference between base stage control terminal 13b and the emitter terminal 13e of switch element 13 diminishes, between the collector terminal 13c and emitter terminal 13e of switch element 13, become non-conduction (disconnection).Being additionally, since switch element 13 to be off, therefore, switch element 12A and 12B disconnects.It is to say, no current flows in resistor R13, R14, therefore, the potential difference between the emitter terminal 12Ae and base terminal 12Ab of switch element 12A diminishes, and switch element 12A becomes disconnection.Similarly, also no current flows in resistor R23, R24, therefore, the potential difference between emitter terminal and the base terminal of switch element 12B diminishes, and switch element 12B becomes disconnection.
In the above-described state, the flow path of coil current i21 is cut off by switch element 11A, and is also cut off by switch element 12A.It addition, the flow path of coil current i22 is cut off by switch element 11B, and also cut off by switch element 12B.
It is to say, coil current i21 does not flow in electric coil 21, therefore, this relay is off, switch 23 maintenance state shown in Fig. 1.It addition, coil current i22 does not flow in electric coil 22, therefore, this relay is also off, switch 24 maintenance state shown in Fig. 1.Therefore, flowing without motor current i30 in dc motor 30, dc motor 30 becomes halted state.
The state > that < drives in forward direction
Such as, if driver operates certain button to open vehicle window (motorized window), then " rotating forward indication signal " temporarily (T21 in Fig. 2 is interval) that be applied to microcomputer 14 becomes Guan Bi.
If " rotating forward indication signal " closes, then control signal SGA is switched to Guan Bi by disconnection by microcomputer 14, meanwhile, by disconnection, control signal SGC is switched to Guan Bi.Control signal SGB maintains the state disconnected.
When control signal SGA closes, potential difference between the gate control terminal 11Ag and source terminal 11As of switch element 11A reaches more than threshold value, is switched through (Guan Bi) state between the drain terminal 11Ad and source terminal 11As of switch element 11A.
Additionally, when control signal SGC closes, potential difference between base stage control terminal 13b and the emitter terminal 13e of switch element 13 reaches more than threshold value, therefore, is switched through (Guan Bi) state between the collector terminal 13c and emitter terminal 13e of switch element 13.
Being additionally, since switch element 13 to close, therefore, switch element 12A and 12B is switched to Guan Bi.It is to say, electric current flows in resistor R13, R14, therefore, the potential difference between the emitter terminal 12Ae and base terminal 12Ab of switch element 12A reaches more than threshold value, and switch element 12A becomes Guan Bi.Similarly, electric current also flows in resistor R23, R24, and therefore, the potential difference between emitter terminal and the base terminal of switch element 12B reaches more than threshold value, and switch element 12B becomes Guan Bi.
In the above-described state, switch element 11A Guan Bi and switch element 12A close, and therefore, form the path for line of flow loop current i21.That is, electric current is from power line 40, by diode D3, electric coil 21, connect terminal 17A, distribution 15A, switch element 12A (emitter stage-inter-collector), distribution 16A, switch element 11A (between Drain-Source), flow to earth lead 41 (1).It addition, switch element 12B becomes Guan Bi, but switch element 11B maintains off-state, therefore, remains cut-off state for the path of line of flow loop current i22.
It is to say, coil current i21 flows in electric coil 21, this relay (upsides of 20) becomes Guan Bi, and the connection status of switch 23 is switched.Based on this, motor current i30, from power line 40, by switch 23, connects terminal 45, terminal 31, dc motor 30, terminal 32, connection terminal 46 and switch 24, flows to earth lead 41 (4).It is to say, motor current i30 forward flow, therefore, dc motor 30 is driven in forward direction.
If the T21 interval shown in Fig. 2 is terminated, " rotating forward indication signal " is switched to disconnection, then control signal SGA and SGC is switched to disconnection again.Based on this, switch element 11A and switch element 12A, 12B are switched to disconnection respectively, and the path of coil current i21 is cut off again.Therefore, the driving of dc motor 30 stops.
As in figure 2 it is shown, the length of the interval T21B of coil current i21 flowing is generally with the interval T21 of " rotating forward indication signal " on an equal basis (situation in rear description fault).Therefore, coil current i21 state of long-time flowing continuously in electric coil 21 will not be there is.
The state > that < drives in reverse directions
Such as, if driver operates certain button to close vehicle window (motorized window), then " reversion indication signal " temporarily (T22 in Fig. 2 is interval) that be applied to microcomputer 14 becomes Guan Bi.
If " reversion indication signal " closes, then control signal SGB is switched to Guan Bi from disconnection by microcomputer 14, meanwhile, from disconnection, control signal SGC is switched to Guan Bi.Control signal SGA maintains the state disconnected.
When control signal SGB closes, the potential difference between gate control terminal and the source terminal of switch element 11B reaches more than threshold value, is switched through (Guan Bi) state between drain terminal and the source terminal of switch element 11B.
Additionally, when control signal SGC closes, potential difference between base stage control terminal 13b and the emitter terminal 13e of switch element 13 reaches more than threshold value, therefore, is switched through (Guan Bi) state between the collector terminal 13c and emitter terminal 13e of switch element 13.
Being additionally, since switch element 13 to close, therefore switch element 12A and 12B is switched to Guan Bi.It is to say, have electric current to flow in resistor R13, R14, therefore, the potential difference between the emitter terminal 12Ae and base terminal 12Ab of switch element 12A reaches more than threshold value, and switch element 12A becomes Guan Bi.Similarly, also having electric current to flow in resistor R23, R24, therefore, the potential difference between emitter terminal and the base terminal of switch element 12B arrives more than threshold value, and switch element 12B becomes Guan Bi.
In the above-described state, switch element 11B Guan Bi and switch element 12B close, and therefore, form the path for line of flow loop current i22.That is, electric current is from power line 40, by diode D3, electric coil 22, connect terminal 17B, distribution 15B, switch element 12B (emitter stage-inter-collector), distribution 16B, switch element 11B (between Drain-Source), flow to earth lead 41 (2).Although it addition, switch element 12A becomes Guan Bi, but switch element 11A maintains off-state, therefore, the path for line of flow loop current i21 remains in that cut-off state.
It is to say, coil current i22 flows in electric coil 22, this relay (downsides of 20) becomes Guan Bi, and the connection status of switch 24 is switched.Based on this, motor current i30, from power line 40, by switch 24, connects terminal 46, terminal 32, dc motor 30, terminal 31, connection terminal 45 and switch 23, flows to earth lead 41 (4).It is to say, motor current i30 reverse flow, therefore, dc motor 30 is driven in reverse directions.
If the T22 interval shown in Fig. 2 is terminated, " reversion indication signal " is switched to disconnection, then control signal SGB and SGC is switched to disconnection again.Based on this, switch element 11B and switch element 12B is switched to disconnection respectively, and the path of coil current i22 is cut off again.Therefore, the driving of dc motor 30 stops.
As in figure 2 it is shown, the length of the interval T22B of coil current i22 flowing is generally with the interval T22 of " reversion indication signal " on an equal basis (situation in rear description fault).Therefore, coil current i22 state of long-time flowing continuously in electric coil 22 will not be there is.
< there occurs action > when fault
Various parts occasionally there are the situation of fault.Such as, each of switch element 11A, 11B, 12A and the 12B in Fig. 1 is semiconductor switch, therefore there is the aging and probability of fault.As concrete example, it is contemplated that be fixed to the situation of the state tending to remain on (short circuit) between the drain electrode of switch element 11A (11Ad)-source electrode (source terminal 11As).It addition, it is also contemplated that be fixed to the situation of the state tending to remain on (short circuit) between the emitter stage of switch element 12A (12Ae)-colelctor electrode (collector terminal 12Ac).For switch element 11B, 12B, too.
The fault of switch element 11A as described above, switch element 12A fault the flow path of coil current i21 is had impact.Just in case, coil current i21 keeps flowing not change, it is likely that: the heating of electric coil 21 causes that temperature anomaly rises, thus the skin that covers of electric coil 21 is destroyed, smolders, catches fire.If it addition, coil current i22 keeps flowing not change, it is likely that: the heating of electric coil 22 causes that temperature anomaly rises, thus the skin that covers of electric coil 22 is destroyed, smolders, catches fire.
But, in the relay drive circuit 10 shown in Fig. 1, in the flow path of coil current i21, switch element 11A and switch element 12A it is inserted with series connection, therefore, if able to by any one controls for disconnecting, then can be cut off by coil current i21 in switch element 11A and 12A, smolder what cause because being energized continuously, catch fire and prevent trouble before it happens.
It practice, switch element 11A and the switch element 12A the two simultaneous faults typically not existence of such situation.Therefore, when switch element 11A there occurs fault, by switch element 12A is controlled into disconnection such that it is able to coil current i21 is cut off.It addition, when switch element 12A there occurs fault, by switch element 11A is controlled into disconnection such that it is able to coil current i21 is cut off.
As described above, when switch element 11B there occurs fault, by switch element 12B being controlled for disconnecting such that it is able to coil current i22 is cut off.It addition, when switch element 12B there occurs fault, by switch element 11B is controlled as disconnecting such that it is able to coil current i22 is cut off.
Therefore, even if one there occurs fault in switch element 11A and switch element 12A, the length of the interval T21B of the coil current i21 shown in Fig. 2 is without change.Even if it addition, in switch element 11B and switch element 12B, one there occurs fault, the length of the interval T22B of the coil current i22 shown in Fig. 2 is without change.
Even if it addition, when switch element 13 there occurs fault, if switch element 11A is switched to disconnection, then can cutting line loop current i21, if switch element 11B is switched to disconnection, then coil current i22 can be cut off.
< the 2nd embodiment >
2nd embodiment is the variation of above-mentioned 1st embodiment.The composition of the major part of the vehicle mounted electric assembling device of the relay drive circuit 10B comprising the 2nd embodiment is illustrated in Fig. 3.It addition, the diagnostic action by the relay drive circuit 10B shown in Fig. 3 is illustrated in Fig. 4.It should be noted that in figure 3, the key element general with the 1st embodiment is marked identical accompanying drawing labelling and illustrates.
The explanation > of < variation point
In the relay drive circuit 10 of the 1st above-mentioned embodiment, even if any one of switch element 11A and 12A there occurs the situation of fault, switch element 11B and 12B any one there occurs fault when, it is also possible to be assuredly shut off coil current i21 and i22.But, when also contemplating at 1 component malfunction and keep this state, the situation that remaining parts break down further.Such as, it is possible to expect that switch element 11A and 12A there occurs that the state of fault, switch element 11B and 12B there occurs the probability of the state of fault.That is, be absorbed in can not the situation of cutting line loop current i21 or i22, there is the probability smoldered, catch fire.
There occurs the situation of fault in order to avoid being absorbed in multiple parts as above, it is necessary to after initial parts there occurs fault, before long-time, repair fault.In the 2nd embodiment, add for utilizing the diagnosis automatically of relay drive circuit 10B to detect the function that this fault occurs and reports when fault being detected of fault.Based on this, before being absorbed in the worst situation, it is possible to urge the user of vehicle, Inspection person's repair a breakdown.
The explanation > of the circuit that < adds
In the relay drive circuit 10B shown in Fig. 3, use additional distribution 18A, the voltage VdA of distribution 16A is applied to the analog input end mouth 14d of microcomputer 14.It addition, use the distribution 18B added, the voltage VdB of distribution 16B is applied to the analog input end mouth 14e of microcomputer 14.
It addition, the function (program) being used for monitoring voltage VdA and VdB tracing trouble is appended to microcomputer 14.Its action is shown in Fig. 4.It addition, for report diagnostic result, display 50 is connected to microcomputer 14.About composition in addition, identical with the relay drive circuit 10 of Fig. 1.
The explanation > of < voltage VdA and VdB
The current potential shown in distribution 16A between 2 switch element 11A and 12A that voltage VdA is connected.When not breaking down, all becoming the timing of disconnection at 2 switch element 11A and 12A, voltage VdA becomes middle current potential or the current potential determined by the circuit of surrounding.On the other hand, when there occurs the switch element 11A fault being fixed to closure state, voltage VdA is fixed to the value close with earthing potential all the time.It addition, when there occurs the switch element 12A fault being fixed to the state of Guan Bi, voltage VdA is fixed to the value close with the current potential of power line 40 all the time.Therefore, by voltage VdA is compared with the threshold value (current potential in the middle of such as) determined in advance such that it is able to identify there is fault-free.
Voltage VdB is the current potential shown in the distribution 16B between 2 switch element 11B and 12B connected.When not breaking down, all becoming the timing of disconnection at 2 switch element 11B and 12B, voltage VdB reaches the current potential of centre or by the current potential of the decision of loop around.On the other hand, when there occurs the switch element 11B fault being fixed to the state of Guan Bi, voltage VdB is fixed to the value close with earthing potential all the time.It addition, when there occurs the switch element 12B fault being fixed to closure state, voltage VdB is fixed to the value close with the current potential of power line 40 all the time.Therefore, by voltage VdB is compared with the threshold value (current potential in the middle of such as) determined in advance such that it is able to identify there is fault-free.
The explanation > of < diagnostic action
Microcomputer 14 in relay drive circuit 10B shown in Fig. 3 implements the diagnostic action shown in Fig. 4, it is thus possible to the serious fault automatically detected in switch element 11A, 11B, 12A and 12B (state fixed with closure state), and report diagnostic result.
Microcomputer 14 is envisioned for: once power supply Guan Bi, then, after carrying out predetermined initialization in S11, identify whether to meet the condition that diagnosis starts in S12.Such as, often begin to diagnosis through certain time, enter into the later process of S13.
In step s 13, microcomputer 14 identifies whether control signal SGA, SGC all disconnect, and enters S14 when meeting this condition, enters S16 when being unsatisfactory for condition.
In step S14, the voltage VdA being applied to analog input end mouth 14d is sampled by microcomputer 14, and measures this magnitude of voltage.It addition, in following step S15, by the magnitude of voltage of the VdA measured in S14 with the threshold ratio determined in advance relatively, thus identifying there is fault-free.
When control signal SGA, SGC disconnect, as it was previously stated, generally, voltage VdA is middle current potential or the current potential determined by the loop of surrounding.But, when there occurs the switch element 11A fault fixed with closure state, VdA becomes electronegative potential, and when there occurs the switch element 12A fault fixed with closure state, VdA becomes high potential.Therefore, by comparing voltage VdA in S15 such that it is able to the fault of identification switch element 11A and the fault of switch element 12A.
In step s 16, microcomputer 14 identifies whether control signal SGB, SGC all disconnect, and enters S17 when meeting this condition, when being unsatisfactory for condition, enters S19.
In step S17, the voltage VdB being applied to analog input end mouth 14e is sampled by microcomputer 14, and measures this magnitude of voltage.It addition, in following step S18, by the magnitude of voltage of the VdB measured in S17 with the threshold ratio determined in advance relatively, thus identifying there is fault-free.
When control signal SGB, SGC disconnect, as it was previously stated, generally, voltage VdB is middle current potential or the current potential determined by the loop of surrounding.But, when there occurs the switch element 11B fault fixed with closure state, VdB becomes electronegative potential, and when there occurs the switch element 12B fault fixed with closure state, VdB becomes high potential.Therefore, by comparing voltage VdB in S18 such that it is able to the fault of identification switch element 11B and the fault of switch element 12B.
In step S19, microcomputer 14 is with reference to the comparative result of S15 and S18, thus identifying with or without detecting fault, entering S20 when fault being detected, if do not detected, returning S12.
In step S20, the state of the fault that microcomputer 14 detects to user, inspection operator's report.Such as, the picture of display 50 shows the message or the mark that represent that relay drive circuit 10 there occurs fault.It addition, by can determine there occurs the position of fault, the information of parts is automatically registered in the nonvolatile memory (not shown) within microcomputer 14.Alternatively, it is also possible to fault is notified upper electronic control unit (ECU: not shown) by communicating.
< the 3rd embodiment >
2nd embodiment is the variation of above-mentioned 1st embodiment.The composition of the major part of the vehicle mounted electric assembling device of the relay drive circuit 10C comprising the 3rd embodiment is illustrated in Fig. 5.It should be noted that in Figure 5, the key element general with the 1st embodiment is marked identical accompanying drawing labelling and illustrates.
The explanation > of < variation point
In the relay drive circuit 10C of Fig. 5, replace switch element 12A and 12B in Fig. 1, and adopt switch element 12C and 12D.That switch element 12C and 12D is P ditch type MOSFET (FET) respectively.It addition, along with switch element 12C and 12D is changed to FET, their peripheral circuit is also changed.But, in the same manner as the composition of Fig. 1, switch element 11A and 12C is connected in series to the path of coil current i21.It addition, switch element 11B and 12D is also connected in series to the path of i22.
So, in 2 switch elements 11A, 12C of series connection, adopt N ditch type MOSFET at low potential side, and adopt P ditch type MOSFET at hot side such that it is able to they are reliably switched.
At the gate control terminal 12Cg of switch element 12C, apply the control signal exported of the output port 14c from microcomputer 14.It addition, at the gate control terminal 12Dg of switch element 12D, apply the control signal exported of the output port 14f from microcomputer 14.
Therefore, in the relay drive circuit 10C of Fig. 5, microcomputer 14 utilizes the control signal exporting output port 14c to control the Guan Bi/disconnection of switch element 12C, and utilizes the control signal exporting output port 14f to control the Guan Bi/disconnection of switch element 12D.About control in addition, identical with the situation of the relay drive circuit 10 of Fig. 1.
In the relay drive circuit 10C shown in Fig. 5, switch element 11A and 12C is also connected, and therefore, even if when the one of switch element 11A and 12C there occurs fault, the residue element of non-fault also is able to reliably be cut off by coil current i21.It addition, switch element 11B and 12D is connected, therefore, even if when the one of switch element 11B and 12D there occurs fault, the residue element of non-fault also is able to reliably be cut off by coil current i22.Therefore, it is possible to avoid coil current i21 or coil current i22 to flow continuously for a long time and occur abnormal temperature to rise.
Herein, the feature of the embodiment of the relay drive circuit above-mentioned present invention related to briefly is summarized respectively and displays as following [1]～[5].
[1] a kind of relay drive circuit (10), it is characterised in that possess:
Relay (20), it comprises the electric coil (21 or 22) of the restriction with continuous conduction time；
1st switch element (11A or 11B), it is configured in the electrical path of described electric coil of described relay；
2nd switch element (12A or 12B), it is arranged in described electrical path with the state with described 1st switch elements in series；And
Energising control portion (microcomputer 14), it is when making described electric coil become "on" position, described 1st switch element and described both 2nd switch elements are controlled for closure state, and when making described electric coil become non-power status, described 1st switch element and described both 2nd switch elements are switched to off-state (with reference to Fig. 2).
[2] relay drive circuit as described in above-mentioned [1], it is characterised in that
Described 1st switch element and described 2nd switch element are the semiconductor switch being respectively provided with control input terminal, and have diverse composition each other.
[3] relay drive circuit as described in above-mentioned [2], it is characterised in that
Described 2nd switch element (12A or 12B) is connected than described 1st switch element (11A or the 11B) position by hot side,
Described relay drive circuit is also equipped with the 3rd switch element (13), and described 3rd switch element (13) controls the current potential of the control input terminal (base terminal 12Ab) of described 2nd switch element.
[4] relay drive circuit as described in above-mentioned [3], it is characterised in that
Possess multiple described 1st switch element and multiple described 2nd switch element,
The lead-out terminal of described 3rd switch element is universally connected to the control input terminal of multiple described 2nd switch element (12A and 12B) (with reference to Fig. 1).
[5] relay drive circuit as according to any one of above-mentioned [1]～[4], it is characterised in that
It is also equipped with fault monitoring portion (14, S12～S18), described fault monitoring portion (14, S12～S18) is at least when making described electric coil become non-power status, monitor the current potential between described 1st switch element and described 2nd switch element, identify there is fault-free.
Claims (5)
1. a relay drive circuit, it is characterised in that possess
Relay, it comprises the electric coil of the restriction with continuous conduction time；
1st switch element, it is configured in the electrical path of described electric coil of described relay；
2nd switch element, it is arranged in described electrical path with the state with described 1st switch elements in series；And
Energising control portion, it is when to make described electric coil be "on" position, control to be closure state by described 1st switch element and described both 2nd switch elements, when being non-power status making described electric coil, described 1st switch element and described both 2nd switch elements are switched to off-state.
2. relay drive circuit according to claim 1, it is characterised in that
Described 1st switch element and described 2nd switch element are the semiconductor switch being respectively provided with control input terminal, and have diverse composition each other.
3. relay drive circuit according to claim 2, it is characterised in that
Described 2nd switch element is connected the position leaning on hot side than described 1st switch element,
Described relay drive circuit is also equipped with the 3rd switch element, and described 3rd switch element controls the current potential of the control input terminal of described 2nd switch element.
4. relay drive circuit according to claim 3, it is characterised in that
Possess multiple described 1st switch element and multiple described 2nd switch element,
The lead-out terminal of described 3rd switch element is universally connected to the control input terminal of multiple described 2nd switch element.
5. the relay drive circuit according to any one of Claims 1 to 4, it is characterised in that
Being also equipped with fault monitoring portion, described fault monitoring portion, at least when to make described electric coil be non-power status, monitors the current potential between described 1st switch element and described 2nd switch element, identifies there is fault-free.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014261281A JP6145446B2 (en) | 2014-12-24 | 2014-12-24 | Relay drive circuit |
| JP2014-261281 | 2014-12-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105742119A true CN105742119A (en) | 2016-07-06 |
| CN105742119B CN105742119B (en) | 2018-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510983427.2A Active CN105742119B (en) | 2014-12-24 | 2015-12-24 | Relay drive circuit |
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| JP (1) | JP6145446B2 (en) |
| CN (1) | CN105742119B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106704997A (en) * | 2017-03-07 | 2017-05-24 | 广东南能汇智节能科技有限公司 | Street lamp control device |
| CN112444720A (en) * | 2019-08-30 | 2021-03-05 | 宁德时代新能源科技股份有限公司 | Detection circuit and detection method of electric control device |
| CN113281641A (en) * | 2020-02-19 | 2021-08-20 | 丰田自动车株式会社 | Control device for power supply circuit |
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| JPS50112760A (en) * | 1974-02-16 | 1975-09-04 | ||
| JPH10106415A (en) * | 1996-09-25 | 1998-04-24 | Fuji Electric Co Ltd | Protective relay |
| CN1362920A (en) * | 2000-02-18 | 2002-08-07 | 三洋电机株式会社 | Relay fusion detector for electrically driven vehicles |
| JP2002279880A (en) * | 2001-03-15 | 2002-09-27 | Toyota Motor Corp | Conducting time limiting electric circuit device |
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| JPS50112760A (en) * | 1974-02-16 | 1975-09-04 | ||
| JPH10106415A (en) * | 1996-09-25 | 1998-04-24 | Fuji Electric Co Ltd | Protective relay |
| CN1362920A (en) * | 2000-02-18 | 2002-08-07 | 三洋电机株式会社 | Relay fusion detector for electrically driven vehicles |
| JP2002279880A (en) * | 2001-03-15 | 2002-09-27 | Toyota Motor Corp | Conducting time limiting electric circuit device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106704997A (en) * | 2017-03-07 | 2017-05-24 | 广东南能汇智节能科技有限公司 | Street lamp control device |
| CN112444720A (en) * | 2019-08-30 | 2021-03-05 | 宁德时代新能源科技股份有限公司 | Detection circuit and detection method of electric control device |
| US11435389B2 (en) | 2019-08-30 | 2022-09-06 | Contemporary Amperex Technology Co., Limited | Electrical control device detection circuit, detection method, and electric vehicle |
| CN113281641A (en) * | 2020-02-19 | 2021-08-20 | 丰田自动车株式会社 | Control device for power supply circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6145446B2 (en) | 2017-06-14 |
| JP2016122544A (en) | 2016-07-07 |
| CN105742119B (en) | 2018-06-19 |
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