CN100475594C - Power supply device for vehicle - Google Patents
Power supply device for vehicle Download PDFInfo
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- CN100475594C CN100475594C CNB2005100838202A CN200510083820A CN100475594C CN 100475594 C CN100475594 C CN 100475594C CN B2005100838202 A CNB2005100838202 A CN B2005100838202A CN 200510083820 A CN200510083820 A CN 200510083820A CN 100475594 C CN100475594 C CN 100475594C
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Abstract
A power device for the vehicle is connected with a control transistor (Qy) via a detection part of current value (400) between a vehicle power supply (200) and a load (300). The power device supplies base current (Ia) to the base of the control transistor (Qy) by an resistance (Ra). A current supply (500) and a first switch (600) are connected in series between the control transistor (Qy) and the vehicle power supply (200). A second switch (700) is connected between a connection point (P1) of the vehicle power supply (200) and the first switch (600) and the connection point (P2) of the control transistor (Qy) and the detection part of current value (400). During the reserve time of driving the load (300) of low power consumption, only the base current (Ia) is used to move the control transistor (Qy), which reduces the power consumption. When the load (300) of great power consumption is driven, the detection part of current value (400) detects the increase of the current flowing from the vehicle power supply (200) to the control transistor (Qy) to make the switch (600) and the switch (700) conductible.
Description
Technical field
The present invention relates to be used to make the vehicle power source device of vehicle-mounted electronic device action.
Background technology
As conventional art, known have Fig. 1 (a) (b) and Fig. 2 (a) (b) shown in the vehicle power source device of structure.
Vehicle power source device in the past 10 shown in Figure 1 is made of three terminal voltage stabilizers (3-terminalregulator) 40, and this three terminals voltage stabilizer 40 is located at the vehicle power (on-vehicle battery) 20 of the cell pressure VB that for example exports 12V and for example between a plurality of vehicle-mounted electronic devices (hereinafter referred to as " load ") 30 with the vehicle-mounted radio of 5V action and on-vehicle acoustic apparatus, vehicle-mounted clock and watch etc.
Herein, vehicle power 20 is connected with distribution circuit, so that when utilizing ignition key making operation ignition lock SIG, also to the supply capabilities such as self-starting motor M that are used for fire an engine.
And, though it is not shown, but between the output of each load 30 and three terminal voltage stabilizers 40, also be connected with wiring, so that when utilizing ignition key opening operation ACC switch (pilot switch), the output voltage V o of three terminal voltage stabilizers 40 only supplies with needs vehicle-mounted clock and watch that keep regular event etc. in a plurality of loads 30, and when making operation ACC switch, except that this vehicle-mounted clock and watch etc., also supply with output voltage V o to other vehicle-mounted electronic devices such as vehicle-mounted radio and on-vehicle acoustic apparatus.
Three terminal voltage stabilizers 40 are made of conductor integrated circuit device (IC), and it constitutes has: NPN transistor (hereinafter referred to as " control transistor ") Qx is connected between vehicle power 20 and the load 30, and is connected with the output of load 30 emitter-base bandgap gradings; Divider resistance R1, R2 with output voltage V o dividing potential drop and detection; Constant-current circuit STC; Acceptance is from the constant current Ic of constant-current circuit STC and produce the reference voltage generating circuit RG of reference voltage V rg; With error amplifier OP.
And, error amplifier OP detects in the voltage Vp of the point of connection generation of divider resistance R1, R2 and the voltage difference (Vp-Vrg) of reference voltage V rg, according to the base current of this voltage difference automatically regulating control with transistor Qx, thus, even when necessary electric power variation that should supply load 30, also can guarantee the output voltage V o of certain (5V), and guarantee the electric power of load 30 is supplied with.
Promptly, in the vehicle power source device in the past 10 that uses three terminal voltage stabilizers 40, after the shutoff operation of having carried out ignition lock SIG and ACC switch, the less vehicle-mounted electronic device of power consumptions such as vehicle-mounted clock and watch that needs is kept sequence, by supplying with the supply that certain output voltage V o carries out necessary electric power, on the other hand, follow the making operation of ACC switch, the vehicle-mounted electronic device action that power consumptions such as on-vehicle acoustic apparatus are bigger, error amplifier OP action is carried out the supply of necessary electric power, thus to increase the base current of control with transistor Qx, even load 30 becomes heavy, also can prevent the reduction of output voltage V o.
In addition, the vehicle power source device in the past 10 shown in Fig. 1 (b) is formed by so-called discrete circuitry, and it constitutes has: transistor Qx use in control, and its emitter-base bandgap grading is exported between the load 30 that is connected vehicle power 20 and is made of a plurality of vehicle-mounted electronic devices; Be connected the control collecting electrode of transistor Qx and the resistance R a between the base stage; Be connected the control base stage of transistor Qx and the resistance R b between the ACC switch S AC; Generation is used to set the zener diode ZD of control with the voltage of voltage regulation Vz of the base potential of transistor Qx.
That is, the vehicle power source device in the past 10 shown in Fig. 1 (b) forms by having the discrete circuitry of control with transistor Qx, resistance R 1, R2 and zener diode ZD, rather than by three terminal voltage stabilizers 40 shown in Fig. 1 (a).
And, ignition lock SIG and ACC switch S AC be carried out turn-off operation after, base current Ia flows into control transistor Qx by resistance R a, control keeps the less vehicle-mounted electronic device of power consumptions such as vehicle-mounted clock and watch of regular event to supply with certain output voltage V o with transistor Qx to needs, carries out the supply of necessary electric power thus.
On the other hand, follow the making operation of ACC switch S AC, the vehicle-mounted electronic device action that power consumptions such as on-vehicle acoustic apparatus are bigger, except that base current Ia, base current Ib also flows into the base stage of control with transistor Qx by ACC switch S AC and resistance R b, carries out the supply of necessary electric power, thus, even load 30 becomes heavy, can prevent that also output voltage V o from reducing.
In addition, in the past vehicle power source device 10 shown in Fig. 2 (a) constitutes, and connects diode D and capacitor C between three terminal voltage stabilizers 40 shown in Fig. 1 (a) and vehicle power 20.
Promptly, diode D and capacitor C constitute charge circuit, ignition lock SIG and ACC switch S AC be carried out turn-off operation after, during the less vehicle-mounted electronic device supply capability of the power consumptions such as vehicle-mounted clock and watch that needs kept regular event (hereinafter referred to as " between standby period "), under the situation that the cell pressure VB of vehicle power 20 descends, by the charging valtage that is recharged in advance in capacitor C is supplied with three terminal voltage stabilizers 40, make three terminal voltage stabilizers 40 continue to produce output voltage V o, carry out the supply of necessary electric power with certain voltage (5V).
In addition, the vehicle power source device in the past 10 shown in Fig. 2 (b) constitutes, and between the collecting electrode and vehicle power 20 of the control shown in Fig. 1 (b) with transistor Qx, the charge circuit that is made of diode D and capacitor C is set.
And, ignition lock SIG and ACC switch S AC be carried out turn-off operation after, between the standby period of the less vehicle-mounted electronic device supply capability of the power consumptions such as vehicle-mounted clock and watch that needs kept regular event, under the situation that the cell pressure VB of vehicle power 20 descends, by the charging valtage that is recharged in advance in capacitor C being supplied with control transistor Qx and resistance R a, prevent that the base current Ia that controls with transistor Qx from reducing, make control continue to produce output voltage V o, carry out the supply of necessary electric power with certain voltage with transistor Qx.
But, in the vehicle power source device in the past 10 shown in Fig. 1 (a) and Fig. 2 (a), use three terminal voltage stabilizers of ICization, as a result, can not freely select the voltage range of the desired relatively output voltage V o of cell pressure VB, exist the low problem of Design freedom.
And, in the vehicle power source device in the past 10 shown in Fig. 1 (b) and Fig. 2 (b), it only is the switching state of following the tracks of ACC switch S AC, making at control becomes electric current I a with the base current of transistor Qx or becomes the resultant current (Ia+Ib) of electric current I a and Ib, so determine the base current of control according to the switching state of ACC switch S AC, can not determine the base current of control according to the actual act state of load 30 with transistor Qx with transistor Qx.
Therefore, when ACC switch S AC is in so-called normal conducting state or off-state, because the operating state of load 30 can be corresponding consistent with the switching state of ACC switch S AC, so in above-mentioned vehicle power source device in the past, can not have problems, but, for example be carried out the transition period of conducting opening operation at ACC switch S AC, although the load 30 that on-vehicle acoustic apparatus etc. are heavier begins action, but be under the situation of off-state at ACC switch S AC, only rely on the base current Ia that resistance R a flows into that passes through shown in Fig. 1 (b) and Fig. 2 (b), control can not be supplied with necessary electric power to this load 30 with transistor Qx, causes output voltage V o to reduce thus.
And, be carried out the transition period of conducting opening operation at above-mentioned ACC switch S AC, suppose the situation of control that exist with the base current out of reach resultant current (Ia+Ib) of transistor Qx, at this situation, use the circuit structure of the bigger control of current amplification degree (hfe) though can adopt with transistor Qx, but because this current amplification degree (hfe) is acted upon by temperature changes bigger, cause when normal temperature is higher current amplification degree, it during low temperature lower current amplification degree, as a result, lower current amplification degree is that benchmark is set base current Ia in the time of can only be with low temperature.That is, resistance R a is made as lower resistance value, so that the base current Ia of big electric current flows into control transistor Qx.
But, if carry out this design, then be nothing but originally only being in order between standby period, to be designed to for example also can drive on-vehicle acoustic apparatus etc. than heavy duty for driving resistance R a that the less vehicle-mounted electronic devices of power consumption such as vehicle-mounted clock and watch are provided with, therefore between the common standby period of non-transition period, can not reduce base current Ia, cause the problem of the power consumption increase of vehicle power source device self.
Summary of the invention
The present invention proposes in view of the above problems, and its purpose is, a kind of vehicle power source device that can reduce the power consumption between standby period is provided.
And, the objective of the invention is to, provide a kind of load during transition to become under the heavy situation vehicle power source device that the reduction with output voltage prevents trouble before it happens.
And, the objective of the invention is to, a kind of vehicle power source device that can improve Design freedom is provided.
One of the present invention's vehicle power source device, be located between vehicle power and the load, and have control and use active component, the supply of cell pressure and electric current is accepted in this control from described vehicle power with active component, supply with according to the rules output voltage and control current and carried out the load driving electric power of power gain to described load, it is characterized in that, have: the current supply path of supplying with the 1st control current to described control with active component, the 1st control current is used for being carried out between the standby period of shutoff operation at the pilot switch of vehicle, controls described active component and provides load driving electric power to the load of needs action; Produce the current source cell of the 2nd control current; The current value detecting unit, when described control is powered to the described load of the action of needs between described standby period according to described the 1st control current with active component, as reference current value, detection flows into described control from described vehicle power and uses the current value of the electric current of active component whether to surpass described reference current value the current value of the electric current that flows into described control usefulness active component from described vehicle power; And switch element, detect when having surpassed described reference current value at described current value detecting unit, except that described the 1st control current, also supply with the 2nd control current to described control with active component from described current source cell, and from the described control of described vehicle power side direction with the active component load driving that is equivalent to corresponding described the 1st, the 2nd control current the electric current of increasing supply with the increase part of electric power.
Description of drawings
Fig. 1 is a circuit diagram of representing the structure of vehicle power source device in the past.
Fig. 2 is a circuit diagram of representing the structure of vehicle power source device in the past.
Fig. 3 is the circuit diagram of structure of the vehicle power source device of two kinds of forms relating to of expression embodiments of the present invention.
Fig. 4 is the circuit diagram of structure of the specific embodiment more of the vehicle power source device that relates to of expression each embodiment shown in Figure 3.
Among the figure: the 100-vehicle power source device; The 200-vehicle power; The 300-load; 400-current value test section; The 500-current source; 600-the 1st switch portion; 700-the 2nd switch portion
The specific embodiment
Below, the embodiment of vehicle power source device of the present invention is described with reference to Fig. 3.Fig. 3 (a) is the circuit diagram of structure of the vehicle power source device of expression the 1st embodiment, and Fig. 3 (b) is the circuit diagram of structure of the vehicle power source device of expression the 2nd embodiment.
(the 1st embodiment)
The structure of the 1st embodiment at first, is described with reference to Fig. 3.
This vehicle power source device 100 is formed by so-called discrete circuitry, is located at the vehicle power (on-vehicle battery) 200 of the cell pressure VB that for example exports 12V and for example between a plurality of vehicle-mounted electronic devices (hereinafter referred to as " load ") 300 with the vehicle-mounted radio of 5V action and on-vehicle acoustic apparatus, vehicle-mounted clock and watch etc.
And, though it is not shown, but be connected with wiring between each load 300 and the output of control with transistor Qy, so that when utilizing ignition key to turn-off ACC switch (pilot switch), control described later is only supplied with the output voltage V o of transistor Qy needs vehicle-mounted clock and watch that keep regular event etc. in a plurality of loads 300, and when connecting the ACC switch, remove this vehicle-mounted clock and watch etc., also to other vehicle-mounted electronic devices supply output voltage V such as vehicle-mounted radio and on-vehicle acoustic apparatus o.
And vehicle power source device 100 constitutes to have: as NPN transistor (control transistor) Qy of control with active component, its emitter-base bandgap grading output connects load 300; Current value test section 400 detects from vehicle power 200 and flows into the current value of control with the electric current I d of the collecting electrode side of active component Qy; Be connected control with the resistance R a between the plus end of the base stage of transistor Qy and vehicle power 200; Be connected in series in control with current source 500 and the 1st switch portion 600 between the plus end of the base stage of transistor Qy and vehicle power 200; Be connected the point of connection P1 of current source 500 and the 1st switch portion 600 and control with the 2nd switch portion 700 between the point of connection P2 of the collecting electrode of transistor Qy and current value test section 400; Generation is used to set the reference voltage generating unit 800 of control with constant potential (for example 5.6V) Vz of the base potential of transistor Qy.
Herein, resistance R a is in order to supply with base current Ia to control with transistor Qy and to be provided with, so that control can keep the less vehicle-mounted electronic device of power consumptions such as vehicle-mounted clock and watch of regular event to supply with necessary electric power to needs with transistor Qy, and can not reduce output voltage V o.
That is, resistance R a is formed by the big resistance of resistance value, forms the current supply path at least between standby period, is used for the less base current Ia that can drive the less vehicle-mounted electronic device of power consumption is used with current supply control as control the base stage of transistor Qy.
Current value test section 400 detects from vehicle power 200 and flows into the current value of control with the electric current I d of the collecting electrode of transistor Qy.And, be operated between open circuited standby period at the ACC switch, be defined as benchmark (hereinafter referred to as " reference current value ") flowing into the current value of control with the electric current I d of the collecting electrode side of transistor Qy, detecting when flowing through current value greater than the electric current I d of this reference current value, make 600 conductings of the 1st switch portion, switch to disconnection (not conducting) in 600 controls of following the 1st switch portion of situation in addition.
Promptly, passing through resistance R a between standby period when control flows into base current Ia with transistor Qy, flow into control with the higher limit of the electric current I d of the collecting electrode side of transistor Qy as reference current value, and pre-determine at design phase etc., when the electric current I d that surpasses this predetermined reference current value flows through current value test section 400, current value test section 400 is judged as the ACC switch and is switched on and is connected with heavier loads 300 such as on-vehicle acoustic apparatus, makes 600 conductings of the 1st switch portion.
The voltage of the 2nd switch portion 700 between point of connection P1, P2 switches to conducting when surpassing assigned voltage, switches to disconnection less than assigned voltage the time.
Promptly, the 2nd switch portion 700 disconnects in the 1st switch portion 600, the voltage between point of connection P1, the P2 is in off-state during less than assigned voltage, when the voltage of 600 conductings of the 1st switch portion, the relative point of connection P1 of point of connection P2 is high potential greater than assigned voltage, be in conducting state.
Thus, under the control of current value test section 400, the 2nd switch portion 700 is followed 600 conductings of the 1st switch portion and is moved and conducting, supplying with the collecting electrode side of control with transistor Qy from vehicle power 200 by the electric current I e that the 1st switch portion 600 flows into.
In addition, in the present embodiment, the 2nd switch portion 700 is moved according to the voltage between point of connection P1, the P2, and switches to conducting or disconnection, but also can be according to the control of current value test section 400, move and switch to conducting or disconnection with the 1st switch portion 600.
And, current source 500 is connected with base stage and 1st switch portion 600 of control with transistor Qy, so when the 1st switch portion 600 disconnects, current supply from vehicle power 200 is cut off, the result makes flow direction control stop with the supply of the base current If of transistor Qy, on the other hand, and when 600 conductings of the 1st switch portion, carry out the current supply from vehicle power 200, the result supplies with base current If to control with transistor Qy.
Below, the action of the vehicle power source device 100 with this structure is described.
At first, when the ACC switch is carried out normal shutoff operation, promptly between standby period, owing to the less vehicle-mounted electronic devices of power consumption such as having only vehicle-mounted clock and watch becomes load 300, and be connected with transistor Qy with control, so control, is supplied with necessary electric power (being load driving electric power) to this load 300, and is remained on certain output voltage V o according to the less base current Ia of current value that flows into by resistance R a with transistor Qy.
In addition, because inflow control also is the value that does not surpass reference current value with the electric current I d of the collecting electrode of transistor Qy, so current value test section 400 is judged as heavier loads such as not connecting on-vehicle acoustic apparatus, form the state that the 1st, the 2nd switch portion 600,700 disconnects and do not supply with transistor Qy to control from current source 500 base current If.
Therefore, be carried out at the ACC switch between the common standby period of normal shutoff operation, owing to do not supply with base current If from current source 500, so can reduce power consumption.
Below, the action when the ACC switch is in the normally state is described.When the ACC switch was in the normally state, heavier load such as on-vehicle acoustic apparatus 300 connected control transistor Qy, became value above reference current value so flow into the electric current I d that controls with transistor Qy side.
And current value test section 400 detects the electric current I d above reference current value, in view of the above the 1st switch portion 600 is switched to conducting, and then the 2nd switch portion 700 also is switched to conducting.In addition, current source 500 is also by the current supply of the 1st switch portion 600 acceptance from vehicle power 200.
Like this, the the 1st, the 2nd switch portion 600,700 conductings as switch element, current source 500 also is in can operating state the time, supply with base current Ia with the base stage of transistor Qy and from the base current If of current source 500 in control, at the collecting electrode of controlling with transistor Qy the electric current I d that flows into by current value test section 400 is arranged not only in addition, also by the 2nd switch portion 700 inflow current Ie.
Therefore, even load 300 becomes when weighing, control also can be supplied with necessary electric power (being load driving electric power) to this load 300 with transistor Qy, and can not reduce output voltage V o.
Below, illustrating that when the ACC switch was carried out the transition of connecting opening operation, the vehicle electronic device that power consumptions such as on-vehicle acoustic apparatus are bigger began action, the transition of ACC switch is the action of off-state.
When carrying out this transition, when heavier load 300 connections such as on-vehicle acoustic apparatus are controlled with transistor Qy and are begun to move, even the transition of ACC switch is an off-state, flow into control with the electric current I d of the collecting electrode side of transistor Qy with so-called quilt than the form that heavy duty 300 pulls, become value above reference current value.
Therefore,, form 600 conductings of the 1st switch portion, and then 700 conductings of the 2nd switch portion according to the control of current value test section 400, and current source 500 state that also can move.
And, be supplied to base current Ia with the base stage of transistor Qy and from the base current If of current source 500 in control, at the collecting electrode of controlling with transistor Qy the electric current I d that flows into by current value test section 400 is arranged not only in addition, also by the 2nd switch portion 700 inflow current Ie.
Therefore, control, even the transition of ACC switch is under the situation of off-state, also can be supplied with necessary electric power to this load 300, and can not reduce output voltage V o when load 300 is heavier with transistor Qy.
As mentioned above, vehicle power source device 100 according to present embodiment, between the standby period of the less vehicle-mounted electronic device action of the power consumption that makes needs maintenance regular events such as vehicle-mounted clock and watch, current source 500 stops action, and according to base current Ia from resistance R a, control is carried out supplying with to the electric power of load 300 with transistor Qy, so can reduce the power consumption of vehicle power source device self.
In addition, in order to reduce the power consumption between standby period, even reduced the current value of base current Ia, be operated at the ACC switch under the situation of the bigger vehicle-mounted electronic device of power consumptions such as connection and connection on-vehicle acoustic apparatus, current source 500 becomes the state that can move, increase supply and control the base current of using transistor Qy, increase supply by the 1st switch portion 700 in addition and flow to the electric current I e of control with the collecting electrode of transistor Qy, supply with necessary electric power to heavier load 300 thus, and can not reduce output voltage V o.
In addition, when the ACC switch is carried out the transition of connecting opening operation, even the ACC switch is when load 300 action under the open circuited situation, also can be according to the actual act situation of the load 300 in this action, flow to control with the base current If of transistor Qy and the supply of collector current Ie, can make it not supply with necessary electric power to load 300 by regulated output voltage Vo with not reducing.
And,,, can improve the design-calculated degree of freedom so can more freely select the voltage range of the desired relatively output voltage V o of cell pressure VB because the vehicle power source device 100 of present embodiment is made of discrete circuitry.
(the 2nd embodiment)
Below, the structure of the 2nd embodiment is described with reference to Fig. 3 (b).In addition, in Fig. 3 (b), utilize same-sign to represent identical or cooresponding part with Fig. 3 (a).
In Fig. 3 (b), this vehicle power source device 100 constitutes, and the charge circuit that is made of diode D and capacitor C is set on vehicle power source device shown in Fig. 3 (a).
That is, the negative electrode of diode D is connected the input end of current value test section 400 and the plus end of vehicle power 200 respectively with anode, connects capacitor C between negative terminal (earth terminal) GND of the negative electrode of diode D and vehicle power 200, constitutes charge circuit thus.
Below, the action of the vehicle power source device 100 with this structure is described.
At first, be operated to connect or be operated with the ACC switch and disconnect irrelevantly, diode D by the current supply capacitor C from vehicle power 200 side inflows, carries out the charging of charging valtage to capacitor C during forward bias.On the other hand, be lower than the charging valtage of capacitor C at the cell pressure VB of vehicle power 200, and diode D is when becoming reverse bias, capacitor C is supplied with charging valtage to current value test section 400 and resistance R a.
Like this, charge circuit is under the situation that cell pressure VB between standby period reduces, by making diode D become reverse bias, and supply with the charging valtage of capacitor C to resistance R a side, can supply with base current Ia to control with transistor Qy by resistance R a, make the less regular events such as vehicle-mounted clock and watch of power consumption, and can not reduce output voltage V o.
And under the situation that cell pressure VB does not reduce between standby period, base current Ia that current value is less and electric current I d flow into base stage and the collecting electrode of control with transistor Qy by diode D respectively.Because electric current I d is the value that does not surpass reference current value, so current value test section 400 is judged heavier loads such as not connecting on-vehicle acoustic apparatus, form the state that the 1st, the 2nd switch portion 600,700 disconnects and do not supply with transistor Qy to control from current source 500 base current If.
Therefore, be carried out at the ACC switch between the common standby period of normal shutoff operation, owing to do not supply with base current If from current source 500, so can reduce power consumption.
Then, when the ACC switch was in normal on-state, heavier load such as on-vehicle acoustic apparatus 300 connected control transistor Qy, became value above reference current value so flow into the electric current I d that controls with transistor Qy side by diode D.
And current value test section 400 detects the electric current I d above reference current value, in view of the above the 1st switch portion 600 is switched to conducting, and then the 2nd switch portion 700 also is switched to conducting.In addition, current source 500 is also by the current supply of the 1st switch portion 600 acceptance from vehicle power 200.
Like this, 1st, the 2nd switch portion 600,700 conductings, current source 500 also is in can operating state the time, be supplied to base current Ia with the base stage of transistor Qy and from the base current If of current source 500 in control, at the collecting electrode of controlling with transistor Qy the electric current I d that flows into by current value test section 400 is arranged not only in addition, also by the 2nd switch portion 700 inflow current Ie.
Therefore, even control uses transistor Qy when load 300 becomes heavy, also can supply with necessary electric power, and can not reduce output voltage V o to this load 300.
Below, illustrating that when the ACC switch is carried out the transition of conducting opening operation the vehicle electronic device that power consumptions such as on-vehicle acoustic apparatus are bigger begins action, the transition of ACC switch is the action of off-state.
When carrying out this transition, when heavier load 300 connections such as on-vehicle acoustic apparatus are controlled with transistor Qy and are begun to move, even the transition of ACC switch is an off-state, flowing into control by diode D also becomes value above reference current value with the electric current I d of the collecting electrode side of transistor Qy.Therefore, under the control of current value test section 400, form 600 conductings of the 1st switch portion, and then 700 conductings of the 2nd switch portion, and current source 500 state that also can move.
And, be supplied to base current Ia with the base stage of transistor Qy and from the base current If of current source 500 in control, at the collecting electrode of controlling with transistor Qy the electric current I d that flows into by current value test section 400 is arranged not only in addition, also by the 2nd switch portion 700 inflow current Ie.
Therefore, control, even be under the situation of off-state in the transition of ACC switch, also can be supplied with necessary electric power to this load 300, and can not reduce output voltage V o when load 300 is heavier with transistor Qy.
As mentioned above, according to the vehicle power source device 100 of present embodiment,, between standby period, under the situation that cell pressure VB reduces, also can make the perseverations such as vehicle-mounted clock and watch that need to keep regular event owing to be provided with charge circuit.
In addition, between standby period, current source 500 stops action, and according to the base current Ia from resistance R a, control is carried out supplying with to the electric power of load 300 with transistor Qy, so can reduce the power consumption of vehicle power source device self.
In addition, in order to reduce the power consumption between standby period, even behind the current value that reduces base current Ia, the ACC switch is operated under the situation of the bigger vehicle-mounted electronic device of power consumptions such as conducting and connection on-vehicle acoustic apparatus, current source 500 becomes can operating state, increase supply and control the base current of using transistor Qy, increase supply by the 1st switch portion 700 in addition and flow to the electric current I e of control with the collecting electrode of transistor Qy, supply with necessary electric power to heavier load 300 thus, and can not reduce output voltage V o.
In addition, when the ACC switch is carried out the transition of conducting opening operation, even the ACC switch is when load 300 action under the open circuited situation, also can be according to the actual act situation of the load 300 in this action, flow to control the base current If of transistor Qy and the supply of collector current Ie, so can supply with necessary electric power to load 300 in ground, and normal output voltage V o can not reduce it.
And the vehicle power source device of present embodiment 100 is made of discrete circuitry, so can more freely select the voltage range of the desired relatively output voltage V o of cell pressure VB, can improve the design-calculated degree of freedom.
(embodiment 1)
Below, with reference to the embodiment more specifically of the 1st embodiment shown in Fig. 4 (a) instruction diagram 3 (a).Fig. 4 (a) is the circuit diagram of structure of the vehicle power source device of expression present embodiment, utilizes same-sign to represent and the identical or cooresponding part of the vehicle power source device of Fig. 3 (a).
In Fig. 4 (a), compare explanation with the vehicle power source device of Fig. 3 (a), be located at the vehicle power 200 of the cell pressure VB that for example exports 12V, for example with the vehicle power source device 100 of the present embodiment between a plurality of loads 300 of 5V action, by being connected in series in the control collecting electrode of transistor Qy and the permanent resistor Rx of the regulation resistance value between the vehicle power 200, Ry forms current value test section 400, form the 1st switch portion 600 by PNP transistor Q600, by being connected point of connection P1, diode D700 between the P2 forms the 2nd switch portion 700, by gate-source short circuit bonded assembly field effect transister (FET) Q500 is formed current source 500, form reference voltage generating unit 800 by the zener diode ZD that produces voltage of voltage regulation (for example 5.6V) Vz that stipulates.
Herein, the base stage of PNP transistor Q600 is connected and fixed the point of connection P3 of resistance R x, Ry, and its emitter is connected and fixed the input end of resistance R x in vehicle power 200 sides, its collecting electrode connection point of connection P1.
And, determine the resistance value of permanent resistor Rx, so that be operated between open circuited standby period at the ACC switch, when the electric current I d that flows to permanent resistor Rx reaches reference current value, make the both end voltage of permanent resistor Rx can not reach the base-emitter voltage that makes PNP transistor Q600 become conducting state, the ACC switch is operated conducting, and load 300 becomes heavy, when the electric current I d that flows to permanent resistor Rx surpasses reference current value, make the both end voltage of permanent resistor Rx reach the aforementioned base emitter voltage.
Therefore, be operated at the ACC switch and disconnect and only make between the standby period of less vehicle-mounted electronic devices such as the vehicle-mounted clock and watch action of power consumption, PNP transistor Q600 ends, when the ACC switch is operated conducting and the heavier vehicle-mounted electronic device of on-vehicle acoustic apparatus even load is moved, PNP transistor Q600 conducting.
The anode of diode D700 and negative electrode are connected with point of connection P1 and P2 respectively, when the voltage difference of the relative point of connection P2 of point of connection P1 reaches so-called forward voltage (for example 0.6V), and diode D700 conducting, less than forward voltage the time, diode D700 ends.
The resistance value of permanent resistor Ry is confirmed as, and when PNP transistor Qy conducting, makes the voltage difference of point of connection P1, P2 reach the forward voltage that makes diode D700 conducting.
Promptly, determine the resistance value of permanent resistor Ry, so that when the electric current I d that flows between standby period reaches reference current value, the both end voltage that makes permanent resistor Ry is less than above-mentioned forward voltage, on the other hand, when the heavier vehicle-mounted electronic device of on-vehicle acoustic apparatus even load is moved, electric current I d becomes the value above reference current value, PNP transistor Q600 conducting is owing to descend and the voltage that produces at point of connection P2 based on the voltage of the resistance R y of this electric current I d, reach above-mentioned forward voltage with the voltage difference of the collector voltage (voltage of point of connection P1) of PNP transistor Qy.
The drain electrode of field effect transister Q500 is connected with point of connection P1, and source electrode connects the base stage of control with transistor Qy, and is connected by short circuit between the gate-source, thereby becomes from source electrode to the constant current source of control with the base stage output base current If of transistor Qy.
And, be carried out the shutoff operation at the ACC switch, PNP transistor Q600 is between the standby period of ending, field effect transister Q500 is in not the action halted state from vehicle power 200 supplying electric currents, and stop to supply with base current If with transistor Qy to control, on the other hand, be carried out the conducting operation at the ACC switch, and when making the action of the heavier vehicle-mounted electronic device of on-vehicle acoustic apparatus even load, PNP transistor Q600 conducting, field effect transister Q500 be in from vehicle power 200 supplying electric currents can operating state, and supply with base current If with transistor Qy to control.
And, resistance R a is connected between the input end of control with vehicle power 200 sides of the base stage of transistor Qy and resistance R x, between standby period, supply with the less vehicle-mounted electronic device of power consumptions such as vehicle-mounted clock and watch that is used to make needs maintenance regular event to control with the base stage of transistor Qy and move the enough little base current Ia of needed current value.
Below, the action of the vehicle power source device 100 with this structure is described.
At first, when the ACC switch has been carried out normal shutoff operation, promptly between standby period, has only the less vehicle-mounted electronic device of power consumption such as vehicle-mounted clock and watch to become load 300, and connect control transistor Qy.Therefore, control, is supplied with necessary electric power to this load 300, and is remained on certain output voltage V o according to the less base current Ia of current value that flows into by resistance R a with transistor Qy.
In addition, because inflow control also is the value that does not surpass reference current value with the electric current I d of the collecting electrode of transistor Qy, so according to the voltage that produces at resistance R x two ends, PNP transistor Q600 remain off state, and then diode D700 also ends, and field effect transister Q500 also is in the action halted state.
Therefore, the electric current I d of the reference voltage value that control is supplied with according to the base current Ia that supplies with by resistance R a with by resistance R x, Ry with transistor Qy, to load 300 supply capabilities, and the reduction that can not produce output voltage V o.
Therefore, be carried out at the ACC switch between the common standby period of normal shutoff operation, owing to do not supply with base current If from current source 500, so can reduce power consumption.
Below, the action when the ACC switch is in the normally state is described.
When the ACC switch was in the normally state, heavier load such as on-vehicle acoustic apparatus 300 connected control transistor Qy, became value above reference current value so flow into the electric current I d that controls with transistor Qy side by resistance R x, Ry.
And, along with the both end voltage of resistance R x rises, PNP transistor Q600 conducting, the pressure drop along with resistance R y increases in addition, and the voltage difference between point of connection P1, the P2 increases, and the Q500 of diode D700 conducting, and then field effect transister thus becomes can operating state.
Like this, in PNP transistor Q600 and diode D700 conducting, field effect transister Q500 also is in can operating state the time, be supplied to base current Ia with the base stage of transistor Qy and from the base current If of field effect transister Q500 in control, at the collecting electrode of controlling with transistor Qy the electric current I d that flows into by resistance R x, Ry is arranged not only in addition, the electric current I e that flows into by diode D700 is also arranged.
Therefore, even when load 300 becomes heavy, control also can be supplied with necessary electric power to this load 300 with transistor Qy, and can not reduce output voltage V o.
Below, illustrating that when the ACC switch is carried out the transition of conducting opening operation the vehicle electronic device that power consumptions such as on-vehicle acoustic apparatus are bigger begins action, the transition of ACC switch is the action of off-state.
When carrying out this transition, when heavier load 300 connections such as on-vehicle acoustic apparatus are controlled with transistor Qy and are begun to move, even the transition of ACC switch is an off-state, flowing into control also becomes value above reference current value with the electric current I d of the collecting electrode side of transistor Qy.
Therefore, along with the both end voltage rising of resistance R x, PNP transistor Q600 conducting, the pressure drop along with resistance R y increases in addition, and the voltage difference between point of connection P1, the P2 increases, and the Q500 of diode D700 conducting, and then field effect transister thus becomes can operating state.
And, be supplied to base current Ia with the base stage of transistor Qy and from the base current If of field effect transister Q500 in control, at the collecting electrode of controlling with transistor Qy the electric current I d that flows into by resistance R x, Ry is arranged not only in addition, also by diode D700 inflow current Ie.
Therefore, when load 300 is heavier and the transition of ACC switch be under the situation of off-state, control also can be supplied with necessary electric power to this load 300 with transistor Qy, and can not reduce output voltage V o.
As mentioned above, vehicle power source device 100 according to present embodiment, between the standby period of the less vehicle-mounted electronic device action of the power consumption that makes needs maintenance regular events such as vehicle-mounted clock and watch, field effect transister Q500 as current source is in the action halted state, and according to base current Ia from resistance R a, control is carried out supplying with to the electric power of load 300 with transistor Qy, so can reduce the power consumption of vehicle power source device self.
In addition, in order to reduce the power consumption between standby period, even behind the current value that reduces base current Ia, the ACC switch is operated under the situation of the bigger vehicle-mounted electronic device of power consumptions such as conducting and connection on-vehicle acoustic apparatus, field effect transister Q500 becomes can operating state, increase supply and control the base current of using transistor Qy, increase supply by diode D700 in addition and flow to the electric current I e of control with the collecting electrode of transistor Qy, supply with necessary electric power to heavier load 300 thus, and can not reduce output voltage V o.
In addition, when the ACC switch is carried out the transition of conducting opening operation, even the ACC switch is when load 300 action under the open circuited situation, also can be according to the actual act situation of the load 300 in this action, flow to control the base current If of transistor Qy and the supply of collector current Ie, so can supply with necessary electric power to load 300, and stably output voltage V o can not reduce it.
And,,, can improve the design-calculated degree of freedom so can more freely select the voltage range of the desired relatively output voltage V o of cell pressure VB because the vehicle power source device 100 of present embodiment is made of discrete circuitry.
In addition, in the present embodiment, utilize field effect transister Q500 to form the current source that produces base current If, but also can replace with following method, that is, the resistance by connection regulation resistance value between control is with the base stage of transistor Qy and point of connection P1 produces base current If.
Below (embodiment 2), with reference to the embodiment more specifically of the 2nd embodiment shown in Fig. 4 (b) instruction diagram 3 (b).Fig. 4 (b) is the circuit diagram of structure of the vehicle power source device of expression present embodiment, utilizes same-sign to represent and the identical or cooresponding part of the vehicle power source device of Fig. 3 (b).
In Fig. 4 (b), compare explanation with the vehicle power source device of Fig. 3 (b), be located at the vehicle power 200 of the cell pressure VB that for example exports 12V, for example with the vehicle power source device 100 of the present embodiment between a plurality of loads 300 of 5V action, by permanent resistor Rx with regulation resistance value, Ry forms current value test section 400, form the 1st switch portion 600 by PNP transistor Q600, by being connected point of connection P1, diode D700 between the P2 forms the 2nd switch portion 700, by being formed current source 500 by short circuit bonded assembly field effect transister (FET) Q500 between the gate-source, form reference voltage generating unit 800 by the zener diode ZD that produces voltage of voltage regulation (for example 5.6V) Vz that stipulates.
And, be connected between the emitter of vehicle power 200 and resistance R x and PNP transistor Q600 as the diode D and the capacitor C of charge circuit.
Below, the action of the vehicle power source device 100 with this structure is described.
At first, the charge circuit that utilizes the formation of diode D and capacitor C is during diode D is for forward bias, capacitor C is carried out the charging of charging valtage, between standby period and under the situation of cell pressure VB decline, diode D becomes reverse bias, to the charging valtage that resistance R a supplies with capacitor C, supplies with base current Ia to control with transistor Qy by resistance R a thus, make maintenance regular events such as the less vehicle-mounted clock and watch of power consumption, and can not reduce output voltage V o.
And, between standby period, because load 30 is lighter, so whether descend irrelevant with charging valtage VB, the electric current I d that flows through resistance R x, Ry can not surpass reference current value, so form PNP transistor Q600 and diode D700 all disconnects and field effect transister Q500 also stops the state to move, flow into base current Ia and current Ib respectively with base stage and the collecting electrode of transistor Qy in control.Therefore, the vehicle power source device 100 of present embodiment can reduce power consumption.
Below, the action when the ACC switch is in the normally state is described.When the ACC switch was in the normally state, the load 300 that on-vehicle acoustic apparatus etc. are heavier connected control transistor Qy.Therefore, flow into control by diode D and resistance R x, Ry and become value above reference current value with the electric current I d of transistor Qy side.And, along with the both end voltage of resistance R x rises PNP transistor Q600 conducting, pressure drop along with resistance R y increases in addition, voltage difference between point of connection P1, the P2 increases, diode D700 conducting thus, and then field effect transister Q500 is become can operating state.
Like this, in PNP transistor Q600 and diode D700 conducting, when field effect transister Q500 also is in the state that can move, control is supplied to base current Ia with the base stage of transistor Qy and from the base current If of field effect transister Q500, at the collecting electrode of controlling with transistor Qy the electric current I d that flows into by resistance R x, Ry is arranged not only in addition, the electric current I e that flows into by diode D700 is also arranged.
Therefore, even load 300 becomes when weighing, control also can be supplied with necessary electric power to this load 300 with transistor Qy, and can not reduce output voltage V o.
Below, illustrating that when the ACC switch is carried out the transition of conducting opening operation the vehicle electronic device that power consumptions such as on-vehicle acoustic apparatus are bigger begins action, the transition of ACC switch is the action of off-state.
When carrying out this transition, when heavier load 300 connections such as on-vehicle acoustic apparatus are controlled with transistor Qy and are begun to move, in the transition of ACC switch is under the situation of off-state, and flowing into control also becomes value above reference current value with the electric current I d of the collecting electrode side of transistor Qy.
Therefore, along with the both end voltage rising of resistance R x, PNP transistor Q600 conducting, the pressure drop along with resistance R y increases in addition, and the voltage difference between point of connection P1, the P2 increases, and the Q500 of diode D700 conducting, and then field effect transister thus becomes can operating state.
And, supply with base current Ia with the base stage of transistor Qy and from the base current If of field effect transister Q500 in control, at the collecting electrode of controlling with transistor Qy the electric current I d that flows into by resistance R x, Ry is arranged not only in addition, the electric current I e that flows into by diode D700 is also arranged.
Therefore, even the transition of ACC switch is under the situation of off-state when load 300 is heavier, control also can be supplied with necessary electric power to this load 300 with transistor Qy, and can not reduce output voltage V o.
As mentioned above, according to the vehicle power source device 100 of present embodiment,, under the situation that cell pressure VB reduces between standby period, also can make the perseverations such as vehicle-mounted clock and watch that need to keep regular event owing to be provided with charge circuit.
In addition, between standby period, stop action as the field effect transister Q500 of current source, and according to the base current Ia from resistance R a, control is carried out supplying with to the electric power of load 300 with transistor Qy, so can reduce the power consumption of vehicle power source device self.
In addition, in order to reduce the power consumption between standby period, even behind the current value that reduces base current Ia, the ACC switch is operated under the situation of the bigger vehicle-mounted electronic device of power consumptions such as conducting and connection on-vehicle acoustic apparatus, field effect transister Q500 becomes can operating state, increase supply and control the base current of using transistor Qy, increase supply by diode D700 in addition and flow to the electric current I e of control with the collecting electrode of transistor Qy, supply with necessary electric power to heavier load 300 thus, and can not reduce output voltage V o.
In addition, when the ACC switch is carried out the transition of conducting opening operation, even the ACC switch is when load 300 action under the open circuited situation, also can be according to the actual act situation of the load 300 in this action, flow to control the base current If of transistor Qy and the supply of collector current Ie, so can supply with necessary electric power to load 300 in ground, and normal output voltage V o can not reduce it.
And the vehicle power source device of present embodiment 100 is made of discrete circuitry, so can more freely select the voltage range of the desired relatively output voltage V o of cell pressure VB, can improve the design-calculated degree of freedom.
In addition, in the present embodiment, utilize field effect transister Q500 to form the current source that produces base current If, but also can replace with following method, that is, the resistance by connection regulation resistance value between control is with the base stage of transistor Qy and point of connection P1 produces base current If.
Claims (7)
1. vehicle power source device, be located between vehicle power and the load, and have control and use active component, the supply of cell pressure and electric current is accepted in this control from described vehicle power with active component, supply with according to the rules output voltage and control current and carried out the load driving electric power of power gain to described load, it is characterized in that having:
Supply with the current supply path of the 1st control current with active component to described control, the 1st control current is used for being carried out between the standby period of shutoff operation at the pilot switch of vehicle, controls described active component and provides load driving electric power to the load of needs action;
Produce the current source cell of the 2nd control current;
The current value detecting unit, when described control is powered to the described load of the action of needs between described standby period according to described the 1st control current with active component, as reference current value, detection flows into described control from described vehicle power and uses the current value of the electric current of active component whether to surpass described reference current value the current value of the electric current that flows into described control usefulness active component from described vehicle power; With
Switch element, detect when having surpassed described reference current value at described current value detecting unit, except that described the 1st control current, also supply with the 2nd control current to described control with active component from described current source cell, and from the described control of described vehicle power side direction with the active component load driving that is equivalent to corresponding described the 1st, the 2nd control current the electric current of increasing supply with the increase part of electric power.
2. vehicle power source device according to claim 1, it is characterized in that also having charhing unit, it is charged to charhing unit by described vehicle power, and when described cell pressure reduces, supply with the charging valtage that is recharged with active component to described control.
3. vehicle power source device according to claim 1 and 2, it is characterized in that described control active component is a NPN transistor, do emitter-base bandgap grading output with described load and be connected, its base stage is supplied to described control current, and collecting electrode is supplied to from the cell pressure of described vehicle power and electric current.
4. vehicle power source device according to claim 1 and 2 is characterized in that, described current source cell produces constant current, and it as described the 2nd control current.
5. vehicle power source device according to claim 1 and 2, it is characterized in that, described current value detecting unit flows into described control from described vehicle power and constitutes with the resistance of the electric current of active component by flowing through, and carries out described detection according to the voltage that produces on described resistance.
6. vehicle power source device according to claim 1 and 2, it is characterized in that, described switch element has: the 1st switch element, and it is located between described current source cell and the described vehicle power, conducting when described current value detecting unit detects above described reference current value; The 2nd switch element, be connected between the 1st point of connection and the 2nd point of connection of described control of described current source cell and the 1st switch element with active component and described vehicle power, along with the conducting of described the 1st switch element, the conducting when voltage between described the 1st, the 2nd point of connection reaches assigned voltage.
7. vehicle power source device according to claim 6 is characterized in that, described the 1st switch element is formed by transistor, and described the 2nd switch element is formed by diode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004206364 | 2004-07-13 | ||
| JP2004206364A JP4597596B2 (en) | 2004-07-13 | 2004-07-13 | Vehicle power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1721224A CN1721224A (en) | 2006-01-18 |
| CN100475594C true CN100475594C (en) | 2009-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100838202A Expired - Fee Related CN100475594C (en) | 2004-07-13 | 2005-07-07 | Power supply device for vehicle |
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| Country | Link |
|---|---|
| JP (1) | JP4597596B2 (en) |
| CN (1) | CN100475594C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI635701B (en) * | 2017-08-31 | 2018-09-11 | 絡達科技股份有限公司 | Bias circuit and power amplifier circuit |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4279854B2 (en) * | 2006-06-28 | 2009-06-17 | トヨタ自動車株式会社 | Vehicle power supply control device |
| JP4730280B2 (en) * | 2006-10-23 | 2011-07-20 | トヨタ自動車株式会社 | Vehicle power supply control device |
| CN101221224B (en) * | 2006-12-22 | 2010-12-15 | 通用汽车环球科技运作公司 | Method and system for monitoring an electrical energy storage device |
| DE102007003424B4 (en) * | 2007-01-23 | 2012-10-31 | Continental Automotive Gmbh | Device, system and method for reducing a quiescent current consumption of a motor vehicle |
| JP5144160B2 (en) * | 2007-07-26 | 2013-02-13 | パナソニック株式会社 | In-vehicle load control device, in-vehicle headlamp device, and in-vehicle taillight device |
| JP4499810B2 (en) * | 2008-05-28 | 2010-07-07 | 株式会社日本自動車部品総合研究所 | In-vehicle battery state estimation device |
| DE102010029115A1 (en) * | 2010-05-19 | 2011-11-24 | Bayerische Motoren Werke Aktiengesellschaft | Method and device for operating a motor vehicle |
| CN102117086B (en) * | 2010-12-29 | 2013-04-17 | 埃泰克汽车电子(芜湖)有限公司 | Pressure regulation control module for vehicle power supply and control method thereof |
| CN103151923B (en) * | 2013-03-28 | 2016-04-06 | 北京经纬恒润科技有限公司 | A kind of stable-pressure device |
| JP2015055598A (en) * | 2013-09-13 | 2015-03-23 | アルプス電気株式会社 | Voltage detector |
| JP7082758B2 (en) * | 2019-05-15 | 2022-06-09 | 株式会社オートネットワーク技術研究所 | Voltage regulator and backup power supply for vehicles |
| JP7010989B2 (en) * | 2020-03-11 | 2022-01-26 | 本田技研工業株式会社 | Vehicle power supply |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0724918Y2 (en) * | 1988-04-25 | 1995-06-05 | シャープ株式会社 | Constant voltage power supply for battery |
| JPH0365974U (en) * | 1989-10-31 | 1991-06-26 | ||
| JPH0659907U (en) * | 1993-01-22 | 1994-08-19 | ジェコー株式会社 | Power supply circuit |
| JPH07246904A (en) * | 1994-03-10 | 1995-09-26 | Kansei Corp | Occupant protective device for vehicle |
| JP3274025B2 (en) * | 1994-06-06 | 2002-04-15 | キヤノン株式会社 | Power supply device and power supply method thereof |
-
2004
- 2004-07-13 JP JP2004206364A patent/JP4597596B2/en not_active Expired - Fee Related
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2005
- 2005-07-07 CN CNB2005100838202A patent/CN100475594C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI635701B (en) * | 2017-08-31 | 2018-09-11 | 絡達科技股份有限公司 | Bias circuit and power amplifier circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4597596B2 (en) | 2010-12-15 |
| JP2006027364A (en) | 2006-02-02 |
| CN1721224A (en) | 2006-01-18 |
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