阅读说明：本技术 电源装置 (Power supply device ) 是由 志治肇 鹈野良之 水岛吉昭 广濑翔平 于 2018-03-20 设计创作，主要内容包括：在通常模式时电压检测部(16)检测的电压值超过第一阈值的情况下,异常判定部(17)将第三开关(SW1)设为断开,使变换器控制部(15)停止。在使变换器控制部(15)停止了的状态下电压值超过第二阈值的情况下,异常判定部(17)判定为第一开关(Q1)异常。在使变换器控制部(15)停止了的状态下电压值小于第二阈值的情况下,异常判定部(17)使变换器(15)动作。在使变换器(15)动作了的状态下电压值超过第三阈值的情况下,异常判定部(17)判定为变换器控制部(15)异常。(In the case that the voltage value that voltage detection department (16) detects in normal mode is more than first threshold, third switch (SW1) is set as disconnecting by abnormality determination unit (17), stops convertor controls portion (15).In the case that voltage value is more than second threshold in the state of stopped convertor controls portion (15), abnormality determination unit (17) is determined as that first switch (Q1) is abnormal.In the case that voltage value is less than second threshold in the state of stopped convertor controls portion (15), abnormality determination unit (17) acts converter (15).In the case that voltage value is more than third threshold value in the state of having acted converter (15), abnormality determination unit (17) is determined as that convertor controls portion (15) is abnormal.)

1. a kind of power supply device, has:

First connecting portion, for connecting the first DC power supply；

Second connecting portion, for connecting the second DC power supply；

First switch and second switch are connected to the first connecting portion between ground connection with being sequentially connected in series；

Inductor and capacitor, be connected to the first switch and second switch tie point with being sequentially connected in series extremely are grounded Between；

Third switch, is connected between the tie point of the inductor and the capacitor and the second connecting portion；

Voltage detection department detects the voltage value of the tie point of the inductor and the capacitor；

Convertor controls portion controls the on-off state of the first switch and the second switch, so that by the electricity Press the voltage value of test section detection close to target value；And

The state model that the convertor controls portion and the third switch is switched to normal mode, the by abnormality determination unit Any one of one abnormal determination mode and the second abnormal determination mode are sentenced based on the voltage of voltage detection department detection It is fixed abnormal,

The normal mode is to act the convertor controls portion and the third switch is made to be the state mould of on-state Formula,

The first abnormal determination mode is to stop the movement in the convertor controls portion and make the first switch and institute Second switch is stated to be off-state and the third switch is made to be the state model of off-state,

The second abnormal determination mode is to act the convertor controls portion and the third switch is made to be off-state State model,

Abnormality determination unit voltage value of the voltage detection department detection in the normal mode is more than the feelings of first threshold Under condition, the state model is switched to the first abnormal determination mode from the normal mode, is sentenced in first exception In the case that the voltage value of the voltage detection department detection is more than second threshold under mould-fixed, it is determined as that the first switch is different Often,

The voltage value of abnormality determination unit voltage detection department detection in the first abnormal determination mode is less than second In the case where threshold value, by the state model from the first abnormal determination pattern switching be the second abnormal determination mode, In the case that the voltage value of the voltage detection department detection is more than third threshold value under the second abnormal determination mode, it is determined as The convertor controls portion is abnormal.

2. power supply device according to claim 1, wherein

The third switch is MOSFET,

The cathode of the body diode of the MOSFET is connect with the tie point of the inductor and the capacitor,

The anode of the body diode of the MOSFET is connect with the second connecting portion.

3. power supply device according to claim 1, wherein

The third switch becomes two MOSFET in mutually opposite direction comprising being connected in series for the direction of body diode.

4. power supply device according to claim 1, wherein

The third switch is bilateral switching element.

5. power supply device according to any one of claims 1 to 4, wherein

Be also equipped with: non-volatile memories portion, for storing the judgement based on the abnormality determination unit as a result,

The abnormality determination unit makes in the case where the non-volatile memories portion stores and shows in the presence of abnormal judgement result The movement in the convertor controls portion stops and makes the first switch and the second switch off-state, and makes institute Stating third switch is off-state.

Technical field

The present invention relates to the power supply devices for being boosted or being depressured to DC voltage.

Background technique

Conventionally, there is known sentencing to the exception of the power supply device generation in the DC-DC converter being connect with DC power supply Fixed technology.

The abnormal determination in a kind of power supply device is disclosed in Japanese Unexamined Patent Publication 2016-140118 bulletin (patent document 1) Method, the power supply device have: first switching element and second switch element are connected to the first DC power supply with being sequentially connected in series To between ground connection；Inductor and capacitor are connected to the connection of first switching element and second switch element with being sequentially connected in series Point is between ground connection；And third switch element, it is connected between the tie point of inductor and capacitor and the second DC power supply.

Specifically, the voltage value of the tie point of inductor and third switch element is first threshold or more under usual movement In the case where, execute the control that third switch element is disconnected and disconnects first switching element and second switch element switches State.Under the state of a control, the case where the voltage value of inductor and the tie point of third switch element is greater than second threshold Under, it is determined as more abnormal by the first direct current source than third switch element.

In the case where being determined as than third switch element by the first direct current source exception, execute first switching element The state of a control that~third switch element disconnects.Under the state of a control, in the tie point of inductor and third switch element In the case that voltage is third threshold value or more, it is determined as first switching element exception.In the company of inductor and third switch element In the case that the voltage of contact is less than third threshold value, it is determined as control system exception.

Citation

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2016-140118 bulletin

Summary of the invention

Subject to be solved by the invention

However, can be led to the problem of in the technology that Japanese Unexamined Patent Publication 2016-140118 bulletin is recorded following.Usually dynamic In the case that the voltage of the tie point of inductor and third switch element is first threshold or more under making, executes and third is switched into member The state of a control that part disconnects and disconnects first switching element and second switch element switches.At this point, in first switching element In the case where short circuit breakdown, it is possible to which second switch element also can be breakdown.That is, trouble unit is possible to will increase.

The disclosure is completed to solve the above problems, it is intended that failure can not increased by providing one kind The power supply device of abnormal judgement is carried out in the case where component.

A technical solution to solve project

According to the disclosure some in terms of power supply device have: first connecting portion, for connect the first DC power supply；The Two interconnecting pieces, for connecting the second DC power supply；First switch and second switch are connected to first connecting portion with being sequentially connected in series To between ground connection；Inductor and capacitor, be connected to first switch and the second switch tie point with being sequentially connected in series extremely are grounded Between；Third switch, is connected between the tie point of inductor and capacitor and second connecting portion；Voltage detection department, detection electricity The voltage value of the tie point of sensor and capacitor；Convertor controls portion controls the on-off of first switch and second switch State, so that by the voltage value of voltage detection department detection close to target value；And abnormality determination unit, by convertor controls portion and The state model of third switch is switched to any in normal mode, the first abnormal determination mode and the second abnormal determination mode Person determines exception based on the voltage of voltage detection department detection.Normal mode is to act convertor controls portion and make third Switch is the state model of on-state.First abnormal determination mode is to stop the movement in convertor controls portion and make first to open It closes and second switch is off-state and third switch is made to be the state model of off-state.Second abnormal determination mode is It acts convertor controls portion and third switch is made to be the state model of off-state.Abnormality determination unit is electric in normal mode In the case where pressing the voltage value of test section detection to be more than first threshold, state model is switched to the first exception from normal mode and is sentenced Mould-fixed is determined as in the case that the voltage value that voltage detection department detects under the first abnormal determination mode is more than second threshold First switch is abnormal.The abnormality determination unit voltage value that voltage detection department detects in the first abnormal determination mode is less than second threshold In the case where, by state model from the first abnormal determination pattern switching be the second abnormal determination mode, in the second abnormal determination mould In the case that the voltage value that voltage detection department detects under formula is more than third threshold value, it is determined as convertor controls portion exception.

Preferably, third switch is MOSFET.The cathode of the body diode of MOSFET and the connection of inductor and capacitor Point connection.The anode of the body diode of MOSFET is connect with second connecting portion.

Preferably, third switch becomes two of mutually opposite direction comprising being connected in series the direction for body diode MOSFET。

Preferably, third switch is bilateral switching element.

Preferably, power supply device is also equipped with the non-volatile memories for storing the judgement result based on abnormality determination unit Portion.Abnormality determination unit makes converter control in the case where non-volatile memories portion stores and shows in the presence of abnormal judgement result The movement in portion processed stops and makes first switch and second switch off-state, and third switch is made to be off-state.

Invention effect

The power supply device of the disclosure can carry out abnormal judgement in the case where not increasing trouble unit.

Detailed description of the invention

Fig. 1 is the circuit block diagram for showing the structure for the power supply device that embodiments of the present invention 1 are related to.

Fig. 2 is the flow chart for showing the process of the abnormal determination processing in the power supply device that embodiment 1 is related to.

Fig. 3 is the circuit diagram for showing the power supply device that the embodiment 1 of embodiment 1 is related to.

Fig. 4 is the circuit diagram for showing the power supply device that another embodiment 2 of embodiment 1 is related to.

Fig. 5 is the circuit block diagram for showing the structure for the power supply device that embodiment 2 is related to.

Specific embodiment

Referring to attached drawing, detailed description of embodiments of the present invention.In addition, for the same or suitable portion in figure Minute mark infuses same appended drawing reference and its explanation is not repeated.In addition, each embodiment described below or variation can also be with Properly selecting property it is combined.

<embodiment 1>

(structure of power supply device)

Fig. 1 is the circuit block diagram for showing the structure for the power supply device 1 that embodiments of the present invention 1 are related to.As shown in Figure 1, Power supply device 1 has external connection terminals 11~14, first switch Q1, second switch Q2, inductor L1, capacitor C1, third Switch SW1, convertor controls portion 15, voltage detection department 16 and abnormality determination unit 17.

DC power supply V1 is connected in external connection terminals 11,12.DC power supply is connected in external connection terminals 13,14 V2.External connection terminals 12,14 and grounding connection.The voltage of DC power supply V1 is higher than the voltage of DC power supply V2.

In the case where the electric power that will be received in external connection terminals 11,12 is exported from external connection terminals 13,14, electricity Source device 1 is functioned as the buck converter being depressured to the DC voltage for being applied to external connection terminals 11,12. At this point, the topological structure for the converter that power supply device 1 has is the buck circuit of synchronous commutation type, power supply device 1 is exported The DC voltage forced down than the direct current of input.On the other hand, in the electric power that will be received in external connection terminals 13,14 from outer In the case that portion's connection terminal 11,12 exports, power supply device 1 is as to the DC voltage for being applied to external connection terminals 13,14 The booster converter that boosts and function.At this point, the topological structure for the converter that power supply device 1 has is synchronous rectification The boost chopper of type, power supply device 1 export the DC voltage higher than the DC voltage of input.Like this, 1 energy of power supply device It is enough bidirectionally to transmit electric power.

First switch Q1 and second switch Q2 is connected between external connection terminals 11,12 with being sequentially connected in series.First Switch Q1 and second switch Q2 is n-channel MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, Metal Oxide Semiconductor Field Effect Transistor).In addition, second switch Q2 can also be made of diode.In In this case, the cathode of diode is connect with first switch Q1.

Between first switch Q1 and the tie point and ground connection of second switch Q2, be connected with being sequentially connected in series inductor L1 and Capacitor C1.

The tie point N1 of inductor L1 and capacitor C1 is connect via third switch SW1 with external connection terminals 13.Third Switch SW1 is for example made of MOSFET etc..As aftermentioned, connection of the third switch SW1 in inductor L1 and capacitor C1 The voltage value of point N1 is turned on when being in normal range (NR), in the voltage value of the tie point N1 of inductor L1 and capacitor C1 Become off-state when becoming abnormal high.Third switch SW1 is used as and prevents from applying electricity to external connection terminals 13,14 as a result, The protective switch of pressure and function.

In turn, when connecting DC power supply V2 to external connection terminals 13,14, third switch SW1 is also set to disconnection shape State.This is to flow through in order to prevent when external connection terminals 13,14 are connected to the DC power supply V2 for making opposite polarity state Big short circuit current and make power supply device failure.

Convertor controls portion 15 controls the on-off state of first switch Q1 and second switch Q2, carries out to being input to Buck converter that the DC voltage of external connection terminals 11,12 is depressured movement or to being input to external connection terminals 13, the booster converter movement that 14 DC voltage boosts.In addition, in the case where second switch is diode, transformation Device control unit 15 only controls the on-off state of first switch Q1.Convertor controls portion 15 determines first switch Q1 and second During the work of on-state in switch Q2 (duty period), and according to during the work of decision to first switch Q1 with And the on-off state of second switch Q2 is controlled.

Convertor controls portion 15 receives the voltage value Vs from tie point N1 from voltage detection department 16.Convertor controls portion 15 exists Buck converter carries out following feedback control when acting, that is, the on-off of control first switch Q1 and second switch Q2 State, so that converging on target value from the received voltage value Vs of voltage detection department 16.

Voltage detection department 16 detects the voltage value Vs at tie point N1.Voltage value Vs at tie point N1 is being depressured Converter is the voltage value of the DC voltage acted by buck converter when acting.The electricity that voltage detection department 16 will test Pressure value Vs is output to convertor controls portion 15 and abnormality determination unit 17.

Abnormality determination unit 17 determines the exception of the voltage value Vs at tie point N1.Abnormal original as voltage value Vs Cause, it is contemplated that the surge of DC power supply V2 is abnormal, the short circuit of first switch Q1 punctures, the feedback control in convertor controls portion 15 Exception.

The surge of so-called DC power supply V2 is abnormal, is the phenomenon that DC power supply V2 moment generating exception high voltage.Root It is carried out according to the state for the load, generator being connect with DC power supply V2 or to external connection terminals 13,14 and DC power supply V2 The inductance of the line of connection, it is possible to produce the surge of DC power supply V2 is abnormal.If the surge for generating DC power supply V2 is abnormal, pass through Become abnormal high by the voltage value Vs of external connection terminals 13 and third switch SW1, tie point N1 also moment.DC power supply V2 Surge be moment extremely, then, the voltage range when voltage value of DC power supply V2 converges on normal.

The short circuit breakdown of so-called first switch Q1, is the phenomenon that first switch Q1 punctures and becomes on state always.If The short circuit breakdown of first switch Q1 is generated, then the voltage value Vs of tie point N1 is got higher singularly to the voltage value of DC power supply V1.

The exception of feedback control in so-called convertor controls portion 15 is following phenomenon, that is, convertor controls portion 15 into When row buck converter acts, the on-off state of first switch Q1 and second switch Q2 are not controlled normally, connection The voltage value Vs of point N1 becomes higher than target value singularly.For example, for some reason and mistake is determined as target value and voltage The difference of value Vs is bigger than actual value, and convertor controls portion 15 will be promoted to maximum value during the connection of first switch Q1, in the feelings Under condition, the exception of feedback control is generated.

Abnormality determination unit 17 by the state model in convertor controls portion 15 and third switch SW1 be switched to normal mode, Any one of first abnormal determination mode and the second abnormal determination mode.

Normal mode is the state model for acting convertor controls portion 15 and making third switch SW1 on-state. When carrying out buck converter movement under normal mode, convertor controls portion 15 carries out feedback control.

First abnormal determination mode is following state model, that is, stops the movement in convertor controls portion 15 and makes One switch Q1 and second switch Q2 is off-state, and makes third switch SW1 off-state.

Second abnormal determination mode is the shape for acting convertor controls portion 15 and making third switch SW1 off-state Morphotype formula.Under the second abnormal determination mode, convertor controls portion 15 carries out feedback control.

In the case that the voltage value Vs that voltage detection department 16 detects in normal mode is more than first threshold, abnormality determination unit State model is switched to the first abnormal determination mode from normal mode by 17.First threshold is following value, that is, ratio is producing The surge of DC power supply V2 is abnormal, times in the short-circuit exception of first switch Q1 and feedback exception in convertor controls portion 15 The minimum value of tie point N1 desirable voltage value is small when one, and ratio tie point N1 when power supply device 1 is normal condition is desirable Voltage value maximum value it is big.First threshold Vth1 is preset.

The case where voltage value Vs that voltage detection department 16 detects under the first abnormal determination mode is more than second threshold Vth2 Under, abnormality determination unit 17 is determined as that first switch Q1 is abnormal (that is, producing short-circuit breakdown in first switch Q1).Second Threshold value Vth2 is following value, that is, the tie point N1 desirable voltage value than in the short circuit breakdown for producing first switch Q1 Minimum value is small, and the maximum value of the voltage value more desirable than the tie point N1 when power supply device 1 is normal condition is big.Second threshold Vth2 is preset.

The voltage value Vs that voltage detection department 16 detects in the first abnormal determination mode is less than the case where second threshold Vth2 Under, abnormality determination unit 17 by state model from the first abnormal determination pattern switching be the second abnormal determination mode.

The case where voltage value Vs that voltage detection department 16 detects under the second abnormal determination mode is more than third threshold value Vth3 Under, abnormality determination unit 17 is determined as that convertor controls portion 15 is abnormal (that is, producing the exception of feedback control).Third threshold Value Vth3 is following value, that is, tie point N1 can use when ratio produces the exception of feedback control in convertor controls portion 15 The minimum value of voltage value is small, and the maximum value of the voltage value more desirable than the tie point N1 when power supply device 1 is normal condition is big.The Three threshold value Vth3 are preset.

The voltage value Vs that voltage detection department 16 detects under the second abnormal determination mode is third threshold value Vth3 feelings below Under condition, abnormality determination unit 17 is determined as the surge exception due to DC power supply V2 and voltage value Vs moment gets higher.

First threshold Vth1, second threshold Vth2 and third threshold value Vth3 can be identical value, or each other Different values.For example, in the case where DC power supply V1 is made of 48V battery, DC power supply V2 is made of 12V battery, first Threshold value Vth1, second threshold Vth2 and third threshold value Vth3 are for example set as 27V degree.In DC power supply V1 by 48V battery In the case where composition, if considering the variation of the output voltage of battery, 30~more than 50 V are applied in external connection terminals 11,12 The voltage of degree.On the other hand, in the case where DC power supply V2 is made of 12V battery, if consider the output voltage of battery It changes, is then applied the voltage of 10~16V degree in external connection terminals 13,14.Decompression change is normally carried out in power supply device 1 Parallel operation act in the case where, be applied to external connection terminals 11,12 DC voltage be depressurized for be applied to external connection terminal The identical degree of DC voltage of son 13,14.That is, the voltage value of the tie point N1 of inductor L1 and capacitor C1 become 10~ 16V degree.Therefore, by the way that first threshold Vth1, second threshold Vth2 and third threshold value Vth3 are set as 27V degree, from And it can determine the exception of the voltage value Vs of tie point N1.

(process of the processing of power supply device)

It is illustrated referring to Fig. 2 process handled the abnormal determination in power supply device 1.Fig. 2 is shown in power supply device 1 Abnormal determination processing process flow chart.

Firstly, the state model in convertor controls portion 15 and third switch SW1 is set as usual by abnormality determination unit 17 Mode (step S1).That is, third switch SW1 is turned on, first switch Q1 and second switch Q2 connect disconnected Open control.

Then, abnormality determination unit 17 from step S1 to have passed through after given time (such as 10ms) by voltage detecting The voltage value Vs and first threshold Vth1 that portion 16 is detected are compared, and determine whether to meet Vs > Vth1 (step S2).

In the case where Vs≤Vth1 ("No" in S2), processing returns to arrive step S1 for abnormal determination.In the feelings of Vs > Vth1 Under condition ("Yes" in S2), abnormality determination unit 17 is by the state model of convertor controls portion 15 and third switch SW1 from usual mould Formula is switched to the first abnormal determination mode (step S3).That is, first switch Q1, second switch Q2 and third switch SW1 become Off-state.

Then, abnormality determination unit 17 by voltage detection department 16 to being detected after it have passed through given time from step S3 Voltage value Vs and second threshold Vth2 are compared, and determine whether to meet Vs > Vth2 (step S4).Switch from by normal mode It is standby until by given time for the first abnormal determination mode, it is to discharge and accumulate in normal mode in connection The charge of point N1.Here, given time is suitably set, for example, several seconds (2 according to the circuit structure of power supply device 1 ~3 seconds).

Here, the voltage value Vs of tie point N1 rises to direct current in the case where first switch Q1 produces short circuit breakdown The voltage value of power supply V1.Therefore, in the case where meeting Vs > Vth2 ("Yes" in S4), abnormality determination unit 17 is determined as that first opens It is abnormal (step S9) to close Q1.After step S9, processing terminate for abnormal determination.

On the other hand, in the case where Vs≤Vth2 ("No" in S4), abnormality determination unit 17 by convertor controls portion 15 with And the state model of third switch SW1 from the first abnormal determination pattern switching be the second abnormal determination mode (step S5).That is, the Three switch SW1 become off-state, carry out on-off control to first switch Q1 and second switch Q2.

Then, abnormality determination unit 17 by voltage detection department 16 to being detected after it have passed through given time from step S5 Voltage value Vs and third threshold value Vth3 are compared, and determine whether to meet Vs > Vth3 (step S6).From by the first abnormal determination Pattern switching is that the second abnormal determination mode is standby until by given time, is to discharge in the first abnormal determination Accumulation is in the charge of tie point N1 when mode.Here, given time is suitably set according to the circuit structure of power supply device 1 It is fixed, for example, several seconds (2~3 seconds).

Here, in the case where producing the exception of feedback control in convertor controls portion 15, when buck converter acts The voltage value Vs of tie point N1 become abnormal high.Therefore, ("Yes" in S6), abnormal determination in the case where meeting Vs > Vth3 Portion 17 is determined as that convertor controls portion 15 is abnormal (step S8).

On the other hand, in the case where Vs≤Vth3 ("No" in S6), abnormality determination unit 17 determines are as follows: sentences in step s 2 The reason of being set to Vs > Vth1 be it is temporary as caused by the surge exception in DC power supply V2, it is without exception in current point in time (step S7).

After step S7, S8, abnormality determination unit 17 makes the state model in convertor controls portion 15 and third switch SW1 The first abnormal determination mode is returned to from the second abnormal determination mode, the converter in power supply device 1 is acted and stops (step S10).After step slo, processing terminate for abnormal determination.

In addition, power supply device 1 restarts if receiving restarting instruction after step slo.At this point, upper In secondary abnormal determination processing, although being determined as that it is without exception that Vs > Vth1 is determined as in the step s 7 in step s 2 In the case of, the exception of last time is temporary, therefore power supply device 1 can normally restart converter movement.Another party Face, in the case where being determined as convertor controls portion 15 or first switch Q1 exception in the abnormal determination of last time processing, as long as Do not execute repairing etc. maintenance, power supply device 1 just again by step S10 stop transformation device act.

As above, the voltage value Vs that voltage detection department 16 detects in normal mode is more than the feelings of first threshold Vth1 Under condition, state model is switched to the first abnormal determination mode from normal mode by abnormality determination unit 17.That is, abnormality determination unit 17 will Third switch SW1 is set as disconnecting, and stops convertor controls portion 15.Voltage value Vs is more than second under the first abnormal determination mode In the case where threshold value Vth2, abnormality determination unit 17 is determined as that first switch Q1 is abnormal.In addition, electric in the first abnormal determination mode In the case that pressure value Vs is less than second threshold Vth2, state model is by abnormality determination unit 17 from the first abnormal determination pattern switching Second abnormal determination mode.That is, third switch SW1 is set as disconnecting by abnormality determination unit 17, act convertor controls portion 15.In In the case that voltage value Vs is more than third threshold value Vth3 under second abnormal determination mode, abnormality determination unit 17 is determined as converter control Portion 15 processed is abnormal.

Like this, in the case that in normal mode, voltage value Vs is more than first threshold Vth1, third switch SW1 is set as The movement of off-state, convertor controls portion 15 stops.Then, in this state, judgement first switch Q1 has without exception.So Afterwards, after it confirmed first switch Q1 not and be exception, act convertor controls portion 15, determine convertor controls portion 15 whether there is or not It is abnormal.Therefore, in the state that first switch Q1 causes short circuit breakdown, convertor controls portion 15 is failure to actuate.As a result, energy The failure of enough second switch Q2 for inhibiting the short circuit breakdown due to first switch Q1.Thereby, it is possible to not increase trouble unit In the case where carry out abnormal judgement.

(embodiment 1 of power supply device)

Then, the specific embodiment for the power supply device 1 being related to present embodiment 1 is illustrated.Power supply device 1 is applied In the system for carrying two different DC power supply V1, V2.For example, can also apply to have as DC power supply V1 is lithium The 48V battery of ion battery and have as DC power supply V2 be lead storage battery 12V battery Vehicular system etc..

Fig. 3 is the circuit diagram for showing the power supply device 1a that the embodiment 1 of embodiment 1 is related to.As shown in figure 3, power supply fills It sets 1a and has external connection terminals 11~14, communication port 19, first switch Q1, second switch Q2, n-channel MOSFET20, electricity Sensor L1, capacitor C1, C2, resistance R1~R4, DC/DC control circuit 151, driver 152 and microcomputer (hereinafter, Referred to as " microcomputer ") 18.

In external connection terminals 11,12, load 2 is also connected with other than the DC power supply V1 as lithium ion battery. Load 2 is driven by the voltage of DC power supply V1.On the other hand, in external connection terminals 13,14, in addition to as lead storage battery DC power supply V2 except be also connected with load 3 and generator 4.Load 3 is driven by the voltage of DC power supply V2.Generator 4 be, for example, alternating current generator.

In the case where the charged state of DC power supply V2 is low, power supply device 1 to from DC power supply V1 using by receiving To DC voltage be depressured obtained from DC voltage charge to DC power supply V2.On the other hand, in DC power supply In the case that the charged state of V1 is low, power supply device 1 is using by the direct current received from generator 4 and DC power supply V2 DC voltage obtained from voltage is boosted charges to DC power supply V1.

N-channel MOSFET20 is the switch element functioned as third switch SW1.The leakage of n-channel MOSFET20 Extreme son is connect with the tie point N1 of inductor L1 and capacitor C1.The source terminal and external connection terminal of n-channel MOSFET20 Son 13 connects.At this point, the cathode of the body diode D1 of n-channel MOSFET20 is connect with tie point N1, the anode of body diode D1 It is connect with external connection terminals 13.Even if as a result, tie point N1 become voltage value it is extremely high in the case where, also can be by making N-channel MOSFET20 prevents the voltage high from external connection terminals 13,14 output abnormalities for off-state.

Capacitor C2 is connected between external connection terminals 11 and external connection terminals 12, makes to be input to external connection terminals 11,12 DC voltage stability.

Resistance R1, R2 are connected between tie point N1 and ground connection with being sequentially connected in series, and are divided the voltage at tie point N1 Pressure.Similarly, resistance R3, R4 is connected between tie point N1 and ground connection with being sequentially connected in series, and is carried out to the voltage at tie point N1 Partial pressure.The tie point of resistance R1 and resistance R2 are connect with DC/DC control circuit 151.The tie point of resistance R3 and resistance R4 with it is micro- Machine 18 connects.

DC/DC control circuit 151 and driver 152 constitute convertor controls portion 15.DC/DC control circuit 151 is packet Containing CPU (Central Processing Unit, central processing unit), ROM (Read Only Memory, read-only memory), The integrated circuit of RAM (Random Access Memory, random access memory) and interface.151 base of DC/DC control circuit Carry out the voltage value Vs at operation tie point N1 in the voltage value of the tie point of resistance R1 and resistance R2.That is, resistance R1, resistance R2 with And a part of DC/DC control circuit 151 constitutes voltage detection department 16.151 machine voltage value Vs of DC/DC control circuit and specified Target value potential difference.DC/DC control circuit 151 is based on the potential difference of operation come operation first switch Q1 and second switch During the respective work for being equivalent to the length during connecting of Q2.DC/DC control circuit 151 passes through so-called P control, PI control Or during PID control carrys out operation.The output of driver 152 is referred to during work of the DC/DC control circuit 151 based on operation It enables.

In addition, DC/DC control circuit 151 is only transported during receiving action signal from microcomputer 18 to during work It calculates.DC/DC control circuit 151 is during receiving stop signal from microcomputer 18, by first switch Q1 and second switch Q2 Connection during be set as 0, make first switch Q1 and second switch Q2 off-state.

Driver 152 is connect with the gate terminal of first switch Q1 and second switch Q2.Driver 152 is according to coming from The instruction of DC/DC control circuit 151 generates pulse signal, and by the output of pulse signal of generation to first switch Q1 and second The gate terminal of switch Q2.Driver 152 carries out the on-off control of first switch Q1 and second switch Q2 as a result,.

Microcomputer 18 is the computer comprising CPU, ROM, RAM and interface.Microcomputer 18 includes to carry out analog/digital conversion A/D converter 181.The analogue value of the voltage of the tie point of resistance R3 and resistance R4 is transformed to the electricity of digital value by A/D converter 181 Pressure value Vs.Resistance R3, resistance R4 and A/D converter 181 constitute voltage detection department 16.

The program of the processing for carrying out above-mentioned abnormality determination unit 17 is previously stored in the ROM of microcomputer 18.Microcomputer 18 CPU by execute the program, to be functioned as abnormality determination unit 17.DC/DC control electricity is connected in microcomputer 18 The gate terminal on road 151 and n-channel MOSFET20.Microcomputer 18 is determined according to based on the voltage value Vs obtained by A/D converter 181 State model, to 151 output action signal of DC/DC control circuit or stop signal.In turn, microcomputer 18 according to decision shape Morphotype formula, will turn on signal or cut-off signal is output to the gate terminal of n-channel MOSFET20.

Microcomputer 18 is connect with communication port 19, and the data that will show the result of abnormal determination processing are defeated via communication port 19 External device (ED) is arrived out.User can be via external device (ED) confirmation abnormal determination processing as a result, it is possible to carry out and the result as a result, Corresponding operation is (for example, the maintenance of any one of first switch Q1, DC/DC control circuit 151, driver 152 and more It changes).

(embodiment 2 of power supply device)

Fig. 4 is the circuit diagram for showing the power supply device 1b that another embodiment 2 of embodiment 1 is related to.As shown in figure 3, Power supply device 1b only difference is that have n-channel MOSFET21 compared with the power supply device 1a that embodiment 1 is related to.In reality It applies in the power supply device 1b that example 2 is related to, constitutes third switch SW1 by two n-channel MOSFET20,21.

N-channel MOSFET21 is connected between n-channel MOSFET20 and external connection terminals 13.N-channel MOSFET21's The cathode of body diode D2 is connect with external connection terminals 13, the anode of body diode D2 and two pole of body of n-channel MOSFET20 The anode of pipe D1 connects.That is, n-channel MOSFET20,21 be connected as respective body diode D1, D2 direction it is mutually opposite.It is logical Cross the direction opposite direction for making body diode D1, D2, thus even if the side DC power supply V2 compared with the side DC power supply V1 at In the case where for high potential, the electric current that inductor L1 is flowed to from external connection terminals 13,14 can be also cut off.Even if existing as a result, In the case where causing stable overvoltage exception in DC power supply V2, the abnormality determination unit 17 being made of microcomputer 18 is (referring to figure 1) also first switch Q1 or convertor controls portion can be determined in the case where not influenced by stable overvoltage exception 15 exception.In addition, the so-called situation for causing stable overvoltage exception in DC power supply V2, is as accidentally wishing voltage ratio The high battery of the voltage (such as 12V) of prestige is connected to the such situation of external connection terminals 13,14.

In turn, the electric current of inductor L1 is flowed to from external connection terminals 13,14 by cutting off, so as to prevent electric current to Second switch Q2 is flowed into, and is able to suppress the component breakdown of second switch Q2.

In addition, third switch SW1 is also possible to the bilateral switching element that bidirectionally can be connected and be cut off.As Bilateral switching element, be able to use do not formed body diode IGBT (Insulated Gate Bipolar Transistor, Insulated gate bipolar transistor), as GaN-FET, mechanical switch as relay etc. of wide band gap semiconducter switch.At this In the case of, third switch SW1 can be constituted with an element, therefore space saving can be sought.

<embodiment 2>

Hereinafter, being illustrated referring to Fig. 5 to the power supply device 10 that embodiments of the present invention 2 are related to.Fig. 5 is to show implementation The circuit block diagram of the structure for the power supply device 10 that mode 2 is related to.

As shown in figure 5, power supply device 10 is compared with power supply device 1 shown in FIG. 1, the difference lies in that having non-volatile Property storage unit 22, and replace abnormality determination unit 17 and have abnormality determination unit 17a.Other aspects and power supply shown in FIG. 1 fill It is identical to set 1, therefore will not be repeated again below in relation to their explanation.

Non-volatile memories portion 22 is the memory for storing the newest judgement result based on abnormality determination unit 17a. Non-volatile memories portion 22 can also for example be built in microcomputer 18 shown in Fig. 3.

Abnormality determination unit 17a also has function below other than the function of the abnormality determination unit 17 of embodiment 1.In It is determined as the situation (referring to the step S9 of Fig. 2) of first switch Q1 exception and is determined as the abnormal situation in convertor controls portion 15 Under (referring to the step S8 of Fig. 2), abnormality determination unit 17a will show and be saved in non-volatile memories portion in the presence of abnormal judgement result 22.In the case where being determined as without exception (referring to the step S7 of Fig. 2), abnormality determination unit 17a will show judgement knot without exception Fruit is saved in non-volatile memories portion 22.In addition, non-volatile when performing any processing in step S7~S9 shown in Fig. 2 Property storage unit 22 be stored with determine result in the case where, abnormality determination unit 17a sentences 22 storage of non-volatile memories portion Determine result to be updated.

In the case where non-volatile memories portion 22 is stored with and shows in the presence of abnormal judgement result, abnormality determination unit 17a Stop the movement in convertor controls portion 15 and make first switch Q1 and second switch Q2 off-state, and opens third Pass SW1 is off-state.Even if as a result, after it will show the judgement result in the presence of exception and be saved in non-volatile memories portion 22 In the case where having restarted power supply device 1, also it is able to suppress from external connection terminals 13,14 output over-voltages.

But in the case where non-volatile memories portion 22 is stored with and shows in the presence of abnormal judgement result, abnormal determination Portion 17a executes the processing of step S4~S10 shown in Fig. 3 in given timing.Here, so-called given timing, is from upper Control unit, which receives, to be determined the timing of instruction again, have passed through from restarting power supply device 1a given time (such as several seconds (2~3 seconds)) timing etc..Even if being saved in as a result, in the judgement result that will show presence exception due to misinterpretation non-easy In the case where the property lost storage unit 22, abnormality determination unit 17a can also be determined again in given timing, will be stored in non-easy The judgement result of the property lost storage unit 22 is updated to without exception.As a result, power supply device 1 can restart.Alternatively, due to In the case that conductor touches first switch Q1 and is determined as first switch Q1 exception, abnormality determination unit 17a can removed Given timing after the conductor is determined again.As a result, being updated, so that being stored in non-volatile memories portion 22 judgement result shows without exception, and power supply device 1 can restart.

Being considered as this disclosed embodiment in all aspects is illustration, rather than restrictive.Of the invention Range is not shown by above-mentioned explanation, is shown in the claims, it is intended to encompass the meaning being equal with claims And all changes in range.

Description of symbols

1,1a, 1b, 10: power supply device, 2,3: load, 4: generator, 11~14: external connection terminals, 15: converter control Portion processed, 16: voltage detection department, 17,17a: abnormality determination unit, 18: microcomputer, 19: communication port, 20,21:n channel mosfet, 22: non-volatile memories portion, 151:DC/DC control circuit, 152: driver, 181:AD converter, C1, C2: capacitor, D1, D2: body diode, L1: inductor, N1: tie point, Q1: first switch, Q2: second switch, R1, R2, R3, R4: resistance, SW1: Third switch, V1, V2: direct current Shen source.