CN106771807A - The detection method of heater switch fault - Google Patents
The detection method of heater switch fault Download PDFInfo
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- CN106771807A CN106771807A CN201611179025.8A CN201611179025A CN106771807A CN 106771807 A CN106771807 A CN 106771807A CN 201611179025 A CN201611179025 A CN 201611179025A CN 106771807 A CN106771807 A CN 106771807A
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- power device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
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- General Physics & Mathematics (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention discloses a kind of detection method of heater switch fault, the method includes：Upper electricity；Control Shang Qiao, lower bridge are in open circuit；Detection electric current, if electric current is not zero, bridge is damaged in judgement, by detecting each lower bridge electric current, bridge short trouble and lower bridge short trouble in judgement；Otherwise, bridge is in open circuit in control, and lower bridge is in channel status；Detection electric current, if electric current is not zero, bridge Damage by Short Circuit in judgement, by detection lower bridge electric current, bridge failure and lower bridge failure in judgement；Otherwise, control Shang Qiao, lower bridge are in path；Detection electric current, if electric current is zero, bridge open fault or each equal open fault of lower bridge in judgement；Otherwise, it is determined that upper bridge is normal, the lower bridge electric current of detection judges lower bridge open circuit or short trouble.The detection method can be able to detect that the failure of switch to be changed when the heater element for occurring when tube failure short circuit is switched for, the branch road is corresponding remains able to the situation of normal work by fault detection method.
Description
Technical field
It is especially a kind of heater switch fault the present invention relates to the air heating apparatus used on a kind of automobile
Detection method.
Background technology
The heater switch circuit of prior art as shown in figure 1, heater switch electric routing switch pipe Q1, Q2, Q3, Q4, Q5,
Q6, heater element A, B, C, resistance R1, R2, R3 are formed by connecting.The heater switch circuit has three heater elements, in reality
Also there can be two heater elements in application process.During work, distinguish the G of controlling switch pipe extremely by control chip to control
Whether is the work of switching tube Q1, Q2, Q3, Q4, Q5, Q6, and then working condition to heater element A, B, C is controlled.It is above-mentioned
The heater switch circuit of structure has the following disadvantages：When one switch tube failure short circuit when, due to same branch road also exist it is another
The switching tube of individual series connection, so the corresponding heater element of the branch road still can be controlled.But because it uses six switching tubes
Three heater elements (four switching tubes are control two heating elements) are controlled, therefore its production cost is higher.It is heavier
Want, cannot independently be detected during due to above-mentioned switch tube failure, therefore when the switching tube that another is connected is damaged, the heating
On-off circuit it is out of hand and may continuous firing, so not only result in the waste of electric energy, and security incident can occur.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of detection method for switching heater circuit failure, the detection side
Method remains able to the situation of normal work in the heater element for occurring when tube failure short circuit is switched for, the branch road is corresponding
When, by fault detection method the failure of switch can be able to detect that to be changed.
The technical scheme is that, there is provided a kind of detection method of heater switch fault, including at least three work(
Rate device 1,2,4, at least two heater elements 1,2 and a control chip；Described power device 4 is upper bridge power device,
Power device 1,2 is lower bridge power device；The quantity of the power device than heater element quantity more than one；The power device
The input of part 4 is connected with positive source, the output end of the power device 4 and one end of heater members 1, heater members 2
One end connects；Input, the power of the other end of the heater members 1, the other end of heater members 2 respectively at power device 1
The input connection of device 2；The output end of the power device 1, the output end of power device 2 are connected with power cathode respectively；
The control end of the power device 1, the control end of power device 2, the control end of power device 4 are connected with control chip；Institute
The control chip stated also is connected by a current sampling circuit with one end of heater members 1, one end of heater members 2；
Described detection method is comprised the following steps：
(1), upper electricity；
(2), the upper bridge power device of control chip control, lower bridge power device are in off state；
(3), control chip has detected whether electric current, if electric current is not zero, bridge power device Damage by Short Circuit in judgement leads to
Cross control chip and detect whether each lower bridge power device has electric current to flow through, bridge power device short trouble and lower bridge in judgement
Power device short trouble；Otherwise, step (4) is performed；
(4), the upper bridge power device of control chip control is in off state, and lower bridge power device is in channel status；
(5), control chip has detected whether electric current, if electric current is not zero, bridge power device Damage by Short Circuit in judgement leads to
Cross whether the lower bridge power device of control chip detection has electric current to flow through, bridge power device short trouble and lower bridge power in judgement
Device open fault；Otherwise, step (6) is performed；
(6), the upper bridge power device of control chip control, lower bridge power device are in channel status；
(7), control chip has detected whether electric current, if electric current is zero, bridge power device open fault or each in judgement
The lower equal open fault of bridge power device；Otherwise, step (8) is performed；
(8), then judge that upper bridge power device is normal, detect whether lower bridge power device has electric current stream by control chip
Cross, bridge power device short trouble and lower bridge power device open fault in judgement.
Described control chip is also connected by a current sampling circuit with positive source or negative pole；Using the attachment structure
Detecting step (8) be：Then judge that upper bridge power device is normal, the upper bridge power device of control chip control, power device 1 are in
Channel status, power device 2 is in off state；(9), control chip has detected whether electric current, if electric current is zero, judges work(
Rate device 1 is opened a way；Otherwise, step (10) is performed；(10), then judge that power device 1 is normal；The upper bridge power device of control chip control
Part, power device 2 are in channel status, and power device 1 is in off state；(11), control chip has detected whether electric current, if
Electric current is zero, then judge that power device 2 is opened a way；Otherwise, it is determined that power device 2 is normal.
A kind of heater switch circuit of the detection method for realizing heater switch fault, including three switching tube Q1, Q2,
Q4, two resistance R1, R2, two heating elements A, B；The C poles of the switching tube Q4 are connected with the positive pole of high-tension battery；It is described to open
The E poles for closing pipe Q4 are connected with an electric connecting terminal of heater element A, an electric connecting terminal of heater element B；The heater element A's
Another electric connecting terminal is connected with the C poles of switching tube Q1；The E poles of the switching tube Q1 are connected with one end of resistance R1；The heating
Another electric connecting terminal of element B is connected with the C poles of switching tube Q2；The E poles of the switching tube Q2 are connected with one end of resistance R2；Institute
The other end of resistance R1, the other end of resistance R2 is stated to be connected with the negative pole of high-tension battery；G poles, the switching tube of the switching tube Q1
The G poles of Q2, the G of switching tube Q3 are extremely connected with control chip.
Described heater switch circuit also includes that one is used to that the induced-current that heater element is produced to be carried out water conservancy diversion to prevent
The diode D1 that switching tube Q1 is damaged, the anode of the diode D1 is connected with the C poles of switching tube Q1；The moon of the diode D1
Pole is connected with the positive pole of high-tension battery.
Described heater switch circuit also includes that one is used to that the induced-current that heater element is produced to be carried out water conservancy diversion to prevent
The diode D2 that switching tube Q2 is damaged, the anode of the diode D2 is connected with the C poles of switching tube Q2；The moon of the diode D2
Pole is connected with the positive pole of high-tension battery.
Described heater switch circuit also prevents from reversal connection high voltage power supply both positive and negative polarity to damage the two of switching tube Q1, Q2 including one
Pole pipe D4, the anode of the diode D4 is connected with the negative pole of high-tension battery, the negative electrode of the diode D4 and the E of switching tube Q4
Pole connects.
After above structure, the present invention compared with prior art, with advantages below：
The detection method of failure of the present invention is able to detect that making for upper bridge and lower bridge breaker in middle pipe by the self-inspection of upper electricity
With state, therefore when any one switching tube is damaged, i.e., the position of switching tube can be directly judged to be changed, from
And avoid result in the waste of electric energy, and it may happen that security incident.Heater switch circuit of the present invention passes through control chip
Carry out the conducting of controlling switch pipe Q1, Q2, Q4 and close, so as to control the break-make of two heating elements A, B.When switching tube Q4 is damaged
When, switching tube Q4 is internally formed path, and at this moment switching tube Q1, Q2 conductings remain able to control two heating elements A, B conducting.And
When switching tube Q1 is damaged, switching tube Q1 is internally formed path, and at this moment switching tube Q4 conductings remain able to control heater element A and lead
It is logical.Similarly, it is also such when switching tube Q2 is damaged.Therefore, when the circuit is when tube failure short circuit is switched for one, the branch road phase
Corresponding heater element remains able to normal work.In the prior art, four switching tubes are control two heating elements, and at this
In application, three switching tubes can control two heating elements, therefore reduce production cost relative to prior art.For this
Application, the heating cause of control is more, and the effect that it reduces production cost is more notable.
Further, described heater switch circuit also includes that one is used to lead the induced-current that heater element is produced
The diode D1 to prevent switching tube Q1 from damaging is flowed, the anode of the diode D1 is connected with the C poles of switching tube Q1；Two pole
The negative electrode of pipe D1 is connected with the positive pole of high-tension battery.Diode D1's sets the induced electricity conductance that can be produced heater element
Go out, so as to prevent damaging switching tube Q1, and then ensure that the functional reliability of the application heater switch circuit.
Further, described heater switch circuit also includes that one is used to lead the induced-current that heater element is produced
The diode D2 to prevent switching tube Q2 from damaging is flowed, the anode of the diode D2 is connected with the C poles of switching tube Q2；Two pole
The negative electrode of pipe D2 is connected with the positive pole of high-tension battery.Diode D2's sets the induced electricity conductance that can be produced heater element
Go out, so as to prevent damaging switching tube Q2, and then ensure that the functional reliability of the application heater switch circuit.
Further, described heater switch circuit also prevents reversal connection high voltage power supply both positive and negative polarity from damaging switching tube including one
The diode D4 of Q1, Q2, the anode of the diode D4 is connected with the negative pole of high-tension battery, the negative electrode of the diode D4 with open
Close the E poles connection of pipe Q4.Electric current can be led back to high voltage power supply and born by the setting of diode D4 when high voltage power supply both positive and negative polarity is reversed
Pole, so as to prevent damaging switching tube, and then improves the functional reliability of the application heater switch circuit.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of prior art heater switch circuit.
Fig. 2 is the circuit theory diagrams of heater switch circuit embodiments 1 of the present invention.
Fig. 3 is the circuit theory diagrams of heater switch circuit embodiments 2 of the present invention.
Fig. 4 is the circuit theory diagrams of heater switch circuit embodiments 3 of the present invention.
Fig. 5 is a kind of flow chart of the detection method embodiment 1 of heater switch fault of the invention.
Fig. 6 is a kind of hardware block diagram of the detection method embodiment 1 of heater switch fault of the invention.
Fig. 7 is a kind of hardware block diagram of the detection method embodiment 2 of heater switch fault of the invention.
Fig. 8 is a kind of hardware block diagram of the detection method embodiment 3 of heater switch fault of the invention.
Specific embodiment
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
As shown in Fig. 5, Fig. 6, Fig. 7, Fig. 8, a kind of detection method of heater switch fault of the invention, including at least three
Individual power device 1,2,4, at least two heater elements 1,2 and a control chip；Described power device 4 is upper bridge power device
Part, power device 1,2 is lower bridge power device；The quantity of the power device than heater element quantity more than one；The work(
The input of rate device 4 is connected with positive source, the output end of the power device 4 and one end, the heater members of heater members 1
2 one end connection；Input, the work(of the other end of the heater members 1, the other end of heater members 2 respectively at power device 1
The input connection of rate device 2；The output end of the power device 1, the output end of power device 2 connect with power cathode respectively
Connect；The control end of the power device 1, the control end of power device 2, the control end of power device 4 are connected with control chip；
Described control chip is also connected by a current sampling circuit with one end of heater members 1, one end of heater members 2, the knot
Structure sampling single control loop electric current；In the present embodiment, use two-way control loop, a control loop by heater element and
Power device is constituted, but it is also possible to using three tunnel control loops, four tunnel control loops etc.；Described control chip is also by an electricity
Stream sample circuit and three loops are all connected with；
Described detection method is comprised the following steps：
(1), upper electricity；
(2), the upper bridge power device of control chip control, lower bridge power device are in off state；
(3), control chip has detected whether electric current, if electric current is not zero, bridge power device Damage by Short Circuit in judgement leads to
Cross control chip and detect whether each lower bridge power device has electric current to flow through, bridge power device short trouble and lower bridge in judgement
Power device short trouble；Otherwise, step (4) is performed；
(4), the upper bridge power device of control chip control is in off state, and lower bridge power device is in channel status；
(5), control chip has detected whether electric current, if electric current is not zero, bridge power device Damage by Short Circuit in judgement leads to
Cross whether the lower bridge power device of control chip detection has electric current to flow through, bridge power device short trouble and lower bridge power in judgement
Device open fault；Otherwise, step (6) is performed；
(6), the upper bridge power device of control chip control, lower bridge power device are in channel status；
(7), control chip has detected whether electric current, if electric current is zero, bridge power device open fault or each in judgement
The lower equal open fault of bridge power device；Otherwise, step (8) is performed；
(8), then judge that upper bridge power device is normal, detect whether lower bridge power device has electric current stream by control chip
Cross, bridge power device short trouble and lower bridge power device open fault in judgement.
The attachment structure is collection total current, described control chip also by a current sampling circuit and positive source or
Negative pole is connected；Use the detecting step (8) of the attachment structure for：Then judge that upper bridge power device is normal, in control chip control
Bridge power device, power device 1 are in channel status, and power device 2 is in off state；(9), control chip has been detected whether
Electric current, if electric current is zero, judges that power device 1 is opened a way；Otherwise, step (10) is performed；(10), then power device 1 is being judged just
Often；The upper bridge power device of control chip control, power device 2 are in channel status, and power device 1 is in off state；(11)、
Control chip has detected whether electric current, if electric current is zero, judges that power device 2 is opened a way；Otherwise, it is determined that power device 2 is normal.
As shown in Fig. 2 a kind of heater switch circuit, including three switching tube Q1, Q2, Q4, two resistance R1, R2, R4,
R5, two heating elements A, B；The C poles of the switching tube Q4 are connected with the positive pole of high-tension battery；The E poles of the switching tube Q4 with
The one electric connecting terminal connection of one electric connecting terminal, heater element B of heater element A；Another electric connecting terminal of the heater element A with
The C poles connection of switching tube Q1；The E poles of the switching tube Q1 are connected with one end of resistance R1；Described the another of heater element B is electrically connected
End is connect to be connected with the C poles of switching tube Q2；The E poles of the switching tube Q2 are connected with one end of resistance R2；The resistance R1's is another
End, the other end of resistance R2 are connected with the negative pole of high-tension battery；The G poles of the switching tube Q1, the G poles of switching tube Q2, switching tube
The G of Q3 is extremely connected with control chip；In the present embodiment, being taken as resistance using resistance R4, R5 is carried out, the resistance R4
One end, one end of resistance R5 be connected with control chip, one end of the resistance R4, one end of resistance R5 are respectively with resistance R1's
One end, one end connection of resistance R2, one end of the resistance R4, one end of resistance R5 can also be another with power device 1 respectively
One end, the other end connection of power device 2, as long as one end of resistance R4, one end access power device 1 of resistance R5 and heating unit
In the loop 2 of the loop 1 of the composition of part 1 or power device 1 and the composition of heater element 1.Heater element A, B are generally PTC, electricity
Resistance silk etc., switching tube is IGBT or is MOSFET；In this application, control chip is generally microprocessor.In the present embodiment
In, can also again add a heater element C, while increasing resistance R3, switching tube Q3, you can.So it is by four switching tubes
Control is capable of achieving, it is specific as shown in Figure 4.DC+, DC- connect high-tension battery.
As shown in figure 3, described heater switch circuit also includes that one is used to carry out the induced-current that heater element is produced
Diode D1 of the water conservancy diversion to prevent switching tube Q1 from damaging, the anode of the diode D1 is connected with the C poles of switching tube Q1；Described two
The negative electrode of pole pipe D1 is connected with the positive pole of high-tension battery.
Described heater switch circuit also includes that one is used to that the induced-current that heater element is produced to be carried out water conservancy diversion to prevent
The diode D2 that switching tube Q2 is damaged, the anode of the diode D2 is connected with the C poles of switching tube Q2；The moon of the diode D2
Pole is connected with the positive pole of high-tension battery.
Described heater switch circuit also prevents from reversal connection high voltage power supply both positive and negative polarity to damage the two of switching tube Q1, Q2 including one
Pole pipe D4, the anode of the diode D4 is connected with the negative pole of high-tension battery, the negative electrode of the diode D4 and the E of switching tube Q4
Pole connects.
Below only highly preferred embodiment of the present invention is described, but is not to be construed as limiting the scope of the invention.This
Invention is not limited only to above example, and its concrete structure allows to change.In every case in the protection model of independent claims of the present invention
Enclose interior made various change within the scope of the present invention.
Claims (6)
1. a kind of detection method of heater switch fault, it is characterised in that：Including at least three power devices 1,2,4, extremely
Few two heating elements 1,2 and a control chip；Described power device 4 is upper bridge power device, under power device 1,2 is
Bridge power device；The quantity of the power device than heater element quantity more than one；The input of the power device 4 and electricity
Source positive pole connection, the output end of the power device 4 is connected with one end of one end of heater members 1, heater members 2；The hair
The other end of thermal device 1, the other end of heater members 2 connect respectively at the input of power device 1, the input of power device 2
Connect；The output end of the power device 1, the output end of power device 2 are connected with power cathode respectively；The power device 1
Control end, the control end of power device 2, the control end of power device 4 are connected with control chip；Described control chip also leads to
A current sampling circuit is crossed to be connected with one end of heater members 1, one end of heater members 2；
Described detection method is comprised the following steps：
(1), upper electricity；
(2), the upper bridge power device of control chip control, lower bridge power device are in off state；
(3), control chip has detected whether electric current, if electric current is not zero, bridge power device Damage by Short Circuit in judgement, by control
Each descends whether bridge power device has electric current to flow through to chip detection processed, bridge power device short trouble and lower bridge power in judgement
Shorted devices failure；Otherwise, step (4) is performed；
(4), the upper bridge power device of control chip control is in off state, and lower bridge power device is in channel status；
(5), control chip has detected whether electric current, if electric current is not zero, bridge power device Damage by Short Circuit in judgement, by control
Whether bridge power device has electric current to flow through under chip detection processed, bridge power device short trouble and lower bridge power device in judgement
Open fault；Otherwise, step (6) is performed；
(6), the upper bridge power device of control chip control, lower bridge power device are in channel status；
(7), control chip has detected whether electric current, if electric current is zero, bridge power device open fault or each lower bridge in judgement
The equal open fault of power device；Otherwise, step (8) is performed；
(8), then judge that upper bridge power device is normal, detect whether lower bridge power device has electric current to flow through by control chip, sentence
Fix bridge power device open circuit or short trouble.
2. the detection method of heater switch fault according to claim 1, it is characterised in that：Described control chip is also
It is connected with positive source or negative pole by a current sampling circuit；Use the detecting step (8) of the attachment structure for：On then judging
Bridge power device is normal, and the upper bridge power device of control chip control, power device 1 are in channel status, and power device 2 is in disconnected
Line state；(9), control chip has detected whether electric current, if electric current is zero, judges that power device 1 is opened a way；Otherwise, step is performed
Suddenly (10)；(10), then judge that power device 1 is normal；The upper bridge power device of control chip control, power device 2 are in path shape
State, power device 1 is in off state；(11), control chip has detected whether electric current, if electric current is zero, judges power device
Part 2 is opened a way；Otherwise, it is determined that power device 2 is normal.
3. a kind of heater switch circuit for realizing the detection method of claim 1 heater switch fault, including three
Switching tube Q1, Q2, Q4, two resistance R1, R2, R4, R5, two heating elements A, B；It is characterized in that：The C of the switching tube Q4
Pole is connected with the positive pole of high-tension battery；The E poles of the switching tube Q4 and an electric connecting terminal of heater element A, the one of heater element B
Electric connecting terminal is connected；Another electric connecting terminal of the heater element A is connected with the C poles of switching tube Q1；The E poles of the switching tube Q1
One end with resistance R1 is connected；Another electric connecting terminal of the heater element B is connected with the C poles of switching tube Q2；The switching tube
The E poles of Q2 are connected with one end of resistance R2；The negative pole of the other end, the other end of resistance R2 and high-tension battery of the resistance R1 connects
Connect；The G poles of the switching tube Q1, the G poles of switching tube Q2, the G of switching tube Q3 are extremely connected with control chip；The resistance R4's
One end, one end of resistance R5 are connected with control chip, and one end of the resistance R4, one end of resistance R5 are respectively with the one of resistance R1
End, one end connection of resistance R2.
4. heater switch circuit according to claim 3, it is characterised in that：Described heater switch circuit also includes that one uses
The diode D1 for carrying out water conservancy diversion in the induced-current produced to heater element to prevent switching tube Q1 from damaging, the diode D1's
Anode is connected with the C poles of switching tube Q1；The negative electrode of the diode D1 is connected with the positive pole of high-tension battery.
5. heater switch circuit according to claim 3, it is characterised in that：Described heater switch circuit also includes that one uses
The diode D2 for carrying out water conservancy diversion in the induced-current produced to heater element to prevent switching tube Q2 from damaging, the diode D2's
Anode is connected with the C poles of switching tube Q2；The negative electrode of the diode D2 is connected with the positive pole of high-tension battery.
6. heater switch circuit according to claim 3, it is characterised in that：Described heater switch circuit also includes that one prevents
Only reversal connection high voltage power supply both positive and negative polarity is damaging the diode D4 of switching tube Q1, Q2, the anode and high-tension battery of the diode D4
Negative pole connection, the negative electrode of the diode D4 is connected with the E poles of switching tube Q4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611179025.8A CN106771807B (en) | 2016-12-19 | 2016-12-19 | The detection method of heater switch fault |
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| CN201611179025.8A CN106771807B (en) | 2016-12-19 | 2016-12-19 | The detection method of heater switch fault |
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| CN106771807B CN106771807B (en) | 2019-08-13 |
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|---|---|---|---|---|
| CN110907858A (en) * | 2018-09-14 | 2020-03-24 | 杭州先途电子有限公司 | Fault detection method of heating switch circuit and electric heater |
| CN110907858B (en) * | 2018-09-14 | 2022-03-15 | 杭州先途电子有限公司 | Fault detection method of heating switch circuit and electric heater |
| CN109347065A (en) * | 2018-11-09 | 2019-02-15 | 浙江国自机器人技术有限公司 | A kind of three-phase drive device detection method, system, equipment and readable storage medium storing program for executing |
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| Publication number | Publication date |
|---|---|
| CN106771807B (en) | 2019-08-13 |
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