CN209217691U - A kind of load driving abnormity protection circuit and washing machine - Google Patents
A kind of load driving abnormity protection circuit and washing machine Download PDFInfo
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- CN209217691U CN209217691U CN201920084531.1U CN201920084531U CN209217691U CN 209217691 U CN209217691 U CN 209217691U CN 201920084531 U CN201920084531 U CN 201920084531U CN 209217691 U CN209217691 U CN 209217691U
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Abstract
The utility model discloses a kind of load driving abnormity protection circuit and washing machines; it is related to electrical equipment control field; wherein load driving abnormity protection circuit includes first switch, second switch and controller; the first switch and the second switch are connected in load driving circuits; each switch in parallel has a switch condition detection circuit, the closing or opening for detection switch；The controller issues the closing or opening that first control signal is used to control first switch, or issues the closing or opening that second control signal is used to control second switch；The controller controls the first switch or second switch disconnects according to first detection signal and first control signal and the second detection signal and second control signal.The utility model accesses concatenated biswitch in load driving circuits, and be arranged switch condition detection circuit the on-off of biswitch is monitored and failure anticipation, when a failure occurs, timely switching off load driving circuit solves electric appliance in routine use because control switch generates security risk extremely.
Description
Technical field
The utility model relates to electrical equipment control field more particularly to a kind of load driving abnormity protection circuits and washing machine.
Background technique
The driving circuit of the functional component (such as motor, heater) of household electrical appliance is because of control circuit damage or abnormal nothing at present
Method stops in time or when abnormal work, can cause electric appliance overheat, the waste of energy that works repeatedly, burn the security risks such as on fire of giving up.For
The problems such as preventing electric appliance from overheating, the protection of major part electrical appliance functional component mostly uses temperature switch, temperature protection pipe at present,
In overcurrent turn-off function or Zapping circuit, stop electrical work.These protection elements are all passive protection device, can not carry out self-test
It is prejudged with failure, sending warning cannot be made in time.
Utility model content
In view of the above drawbacks of the prior art, the technical problem to be solved by the utility model is to provide a kind of load drives
Dynamic abnormity protection circuit provides biswitch control protection, directly the working condition in load driving circuits can be monitored and
Failure anticipation solves electric appliance in routine use because electronic device generates security risk extremely.
To achieve the above object, the utility model provides a kind of load driving abnormity protection circuit, including first switch
And second switch, the first switch and the second switch are connected in load driving circuits, the first switch is parallel with
First detection circuit, the second switch are parallel with the second detection circuit, and first detection circuit detects first switch both ends
Voltage difference, and export first detection signal, the voltage difference at the second detection circuit detection second switch both ends, and export the
Two detection signals；
The controller receives the first detection signal, and forms first switch status information；The controller receives
First detection signal, and form second switch status information；
The controller issues the closing or opening that first control signal is used to control first switch, and forms the first control
Information；The control issues the closing or opening that second control signal is used to control second switch, and forms the second control information；
The controller compares first state information and the first control information and the second status information and the second control letter
Breath, when the meaning of first state information and the first control information is inconsistent, the controller controls the second switch and disconnects；
When the meaning of the second status information and the second control information is inconsistent, the controller controls the first switch and disconnects.
Further, the detection circuit includes optocoupler, and the optocoupler includes photophore and light-receiving device, the hair of the optocoupler
Control switch both ends, the output end output detection signal of the light-receiving device of the optocoupler are parallel to after light device and resistance series connection.
Further, the first switch has multiple, and multiple first switches are followed by with second switch series connection
Enter corresponding load driving circuits.
Further, the load is AC load.
Further, the electric-controlled switch is relay or silicon-controlled.
Further, the load is DC load.
Further, the electric-controlled switch is relay or semiconductor switch pipe.
Further, the controller is single-chip microcontroller.
The utility model also provides a kind of washing machine, drives abnormity protection circuit using load as described above.
The utility model has the beneficial effects that
(1) control switch is parallel with detection circuit, can online more current control switch state whether with control
Device setting is consistent；
(2) each load receives biswitch control, when one of switch occurs abnormal, can detect in time and by another
One switch disconnects load driving；
(3) this circuit can support various control to switch, and have extensive adaptability, and the application for being suitble to safety requirements high is special
Not Shi He motor control, heating wire control etc. high-power applications；
(4) this circuit can be applied to alternating current load driving circuit, can also be applied to DC load driving circuit；
The load driving abnormity protection circuit of the utility model accesses concatenated biswitch in load driving circuits, and is arranged
Switch condition detection circuit is monitored to the on-off of biswitch and failure anticipation, and when a failure occurs, timely switching off load drives
Dynamic circuit solves electric appliance in routine use because control switch generates security risk extremely.
Detailed description of the invention
Fig. 1 is the functional block diagram of the load driving abnormity protection circuit of the utility model.
Fig. 2 is the multichannel loading drive part schematic diagram of the multichannel loading driving abnormity protection circuit of the utility model.
Fig. 3 is the circuit diagram one of the load driving abnormity protection circuit of the washing machine of specific embodiment of the utility model.
Fig. 4 is the circuit diagram two of the load driving abnormity protection circuit of the washing machine of specific embodiment of the utility model.
Specific embodiment
To further illustrate each embodiment, the utility model is provided with attached drawing.These attached drawings are in the utility model discloses
A part of appearance mainly to illustrate embodiment, and can cooperate the associated description of specification former come the running for explaining embodiment
Reason.Cooperation refers to these contents, and those of ordinary skill in the art will be understood that other possible embodiments and sheet are practical new
The advantages of type.Component in figure is not necessarily to scale, and similar component symbol is conventionally used to indicate similar component.
Now in conjunction with the drawings and specific embodiments, the present invention will be further described.
As shown in Figure 1, the utility model load driving abnormity protection circuit functional block diagram, including first switch K1 and
Second switch K2, first switch K1 and second switch K2 are connected in load LOAD driving main circuit, and first switch K1 is parallel with
First detection circuit 1, second switch K2 have the second detection circuit 2, and the first detection circuit 1 detects the voltage at the both ends first switch K1
Difference, and first detection signal TP1 is exported, the second detection circuit 2 detects the voltage difference at 2 both ends of second switch, and exports the second inspection
Survey signal TP2；
Controller MCU exports the closing or opening of first control signal CTRL1 control first switch K1, and forms the first control
Information S_CTRL1 processed；Controller MCU exports the closing or opening of second control signal CTRL2 control second switch K2, CTRL1
And the second control information S_CTRL2 is formed,
Controller MCU receives the detection signal TP2 of first detection signal TP1 and second, and forms first state information S_TP1
With the second status information S_TP2.When the meaning of the first control information S_CTRL1 and first state information S_TP1 is inconsistent, the
One switch K1 is abnormal or damages；Equally, as the second control information S_CTRL2 and the second status information S_TP2 inconsistent, second
Switch K2 is abnormal or damages.The meaning of each status information includes open and close.
In the present embodiment, the first detection circuit 1 and the second detection circuit 2 are all made of photoelectric coupled circuit, with the first detection electricity
Road 1 is for example, the first detection circuit includes optocoupler U1, and the inside optocoupler U1 includes photophore and light-receiving device, the first optocoupler U1's
First input end and the second input terminal are connected respectively to the both ends of photophore, and wherein first input end and the second input terminal lead to respectively
Cross resistance R1, resistance R2 is connected to the both ends of first switch K1, formation detection bypass；The first output end of first optocoupler U1 and
Two output ends are connected respectively to the both ends of light-receiving device, wherein the first output end is pulled upward to control power vd D by resistance R5, and defeated
First detection signal TP1 gives controller MCU, second output terminal ground connection out.
When first switch K1 in the closure state, the voltage at the both ends first switch K1 is 0 or is close to 0, is less than optocoupler
The conducting voltage of the photophore of U1, photophore do not shine.
When first switch K1 is in an off state, electric current passes through the input terminal of optocoupler U1, when the both ends first switch K1 are made
The conducting voltage of photophore for the voltage of optocoupler U1 input terminal greater than the first optocoupler U1, photophore shine and drive light-receiving device
Conducting, the first output end drop-down output low level of the first optocoupler U1, first detection signal TP1 is low level；Work as first switch
Less than the conducting voltage of the light emitting diode of the first optocoupler U1, the first output end of the first optocoupler U1 will pass through the voltage at the both ends K1
External pull-up resistor R5 exports high level, and the first detection signal TP1 of the first optocoupler U1 output is high level signal.
It is AC load that this load, which drives the load of abnormity protection circuit, AC power source is connected, when first switch K1 is in
When off-state, the voltage cycle at the both ends first switch K1 greater than the first optocoupler U1 photophore conducting voltage, first
The first detection signal TP1 of optocoupler U1 output is square-wave signal.
Resistance R1, resistance R2 play current-limiting protection, and limitation is avoided by the electric current of the photophore of the first optocoupler U1 because of list
A resistance damage causes the risk of the first optocoupler U1 overcurrent damage, and then leads to the risk that detection circuit fails or appearance is short-circuit.
Likewise, working as second switch K2 in the closure state, the second detection of the second optocoupler U2 output signal TP2 is high electric
Ordinary mail number；When second switch K2 is in an off state, the second detection signal TP2 of the second optocoupler U2 output is square-wave signal.
First switch K1 and second switch K2 are controlled by controller MCU, in normal condition, the first control of controller MCU output
Signal CTRL1 processed controls first switch K1 closing or opening, and forms the first control information S_CTRL1, when controller MCU is exported
When first control signal CTRL1 is close command, the first control information S_CTRL1 are as follows: closure；When controller MCU exports first
When control signal CTRL1 is open command, the first control information S_CTRL1 are as follows: disconnect.By certain delay, controller MCU
It receives first detection signal TP1 and forms first state information S_TP1, when first detection signal TP1 is high level, first state
Information S_TP1 are as follows: closure；When first detection signal TP1 is square-wave signal, first state information S_TP1 are as follows: disconnect.When
When the meaning of the control of one status information S_TP1 and first information S_CTRL1 is inconsistent, first switch K1 operation irregularity or damage are indicated
It is bad.
Similarly, when the meaning of the control of the second status information S_TP2 and second information S_CTRL2 is inconsistent, second is indicated
Switch K2 operation irregularity or damage.
When first switch K1 and second switch K2 is closed, power drives loaded work piece.When controller MCU sends instructions notice
When first switch K1 shutdown stops working, first switch K1 occurs abnormal and can not turn off, and controller MCU detects first switch
The exception of K1, and load driving circuits long-time abnormal work is avoided by second switch K2 switching off load driving circuit in time,
It causes danger.
As shown in Fig. 2, in a particular application, usually setting a total control switch in a device, which is
Second switch K2, and multiple first switch K1, such as K1-1, K1-2 ... ... are equipped with, K1-n is for controlling different loads.When appoint
There is abnormal, controller MCU shutdown second switch K2, shutdown all loads in one first switch K1.When second switch K2 appearance is different
Often, controller MCU will turn off whole first switch K1, such as K1-1, K1-2 ... ..., and K1-n is to turn off whole loads.Guaranteed with this
Device using safe.
Fig. 3 and it is shown in Fig. 4 be washing machine load driving abnormity protection circuit circuit diagram.
Washing machine has multiple AC loads, and circuit can be divided into multiple circuit modules.
As shown in Fig. 3-d, control output ZZ, FZ, PS, JS and BZ of controller MCU is exported by driving chip U4: motor
Positive rotaring signal ULN_ZZ, motor reversal signal ULN_FZ, drain signal ULN_PS, water inlet signal ULN_JS and warning information ULN_
BZ and master control signal ULN_L_OUT_SW.
The motor for washer driving circuit as shown in Fig. 3-a, motor use silicon-controlled progress positive and negative rotation control, positive rotaring signal
ULN_ZZ and reverse signal ULN_FZ controls silicon-controlled Q1, Q2, one end difference of silicon-controlled Q1, Q2 by optocoupler U1, U2 respectively
It is connected to N_ZZ and N_FZ, silicon-controlled Q1, Q2 other end is connected to L_OUT, N_ZZ and N_FZ, accesses motor.As silicon-controlled Q1
When conducting, motor is rotated forward；When silicon-controlled Q2 conducting, motor reversal.
The washing machine as shown in Fig. 3-b is controlled into draining control circuit, water inlet using relay, drain signal PS, water inlet
Signal JS is connected respectively to the control terminal of relay RL1, RL2, and the output end of relay RL1 is connected respectively to N_JS and L_OUT,
The output of relay RL2 is connected respectively to N_PS and L_OUT, and N_JS and N_PS access water intake and drainage control device.As relay RL1
When conducting, washing machine inflow；When relay RL2 conducting, washing machine drainage.
The washing machine as shown in Fig. 3-c drives total control circuit, and master control is controlled using relay, master control signal ULN_
L_OUT_SW is connected to the control terminal of relay RL3, and the output of relay RL3 is connected respectively to L and L_OUT.As relay RL3
When conducting, motor can work into load driving circuits such as drainings；When relay RL3 shutdown, motor is filled into draining control
It the loads such as sets to stop working.
In this application, silicon-controlled Q1, Q2, relay RL1, RL2 are first switch K1, and relay RL3 is second switch
K2.L_OUT is the tie point of each switch, and detection circuit is parallel on each switch, and Fig. 4 provides 5 groups of detection circuits, respectively simultaneously
Be coupled to silicon-controlled Q1, Q2 and relay RL1, RL2, RL3, and export detection signal JS_TP, PS_TP, FZ_TP, ZZ_TP and
RL3_TP, the output that wherein RL3_TP is master control relay RL3 detect signal.
U4 is ULN2003, and ULN2003 is large driven current density array, is chiefly used in single-chip microcontroller, intelligence instrument, PLC, digital quantity
In the control circuits such as output card, the load such as relay can be directly driven.
The controller MCU connected in this load driving abnormity protection circuit, is the control MCU of washing machine, the control of this circuit
System is only a part of its digital output modul, using its part number I/O port, output control signal L_OUT_SW, BZ, JS,
PS, FZ and ZZ, and input detection signal JS_TP, PS_TP, FZ_TP, ZZ_TP and RL3_TP.
Controller MCU can meet the control requirement of this load driving abnormity protection circuit, tool using general single-chip microcontroller
Depending on the model of controller MCU is because of the functional requirement of washing machine in body application, it is not limited here.
This load driving abnormity protection circuit is also applied for other AC load applications, and such as heater is applied to hair
It is electrodeless to be applicable in relay, silicon-controlled etc. by the driving abnormal protection of the loads such as heat pipe, first switch K1 and second switch K2 therein
Property switch.
This load driving abnormity protection circuit can also be applied to DC load, such as negative applied to direct current generator, heat-generating pipe
The driving abnormal protection of load.First switch K1 and second switch K2 therein, be applicable in the nonpolarity switch such as relay and triode,
The semiconductor switch such as metal-oxide-semiconductor.In the load driving abnormity protection circuit for being applied to DC load, the first input end of optocoupler is connect
Forward voltage, the second input termination negative voltage.
By the combination control and detection of biswitch, controller MCU can realize switch control and monitoring one, pass through state
The on state or off state of confirmation switch is compared, realizes fault detection and fault location function.
Although specifically showing and describing the utility model in conjunction with preferred embodiment, those skilled in the art is answered
This is understood, in the spirit and scope for not departing from the utility model defined by the appended claims, in form and details
On the utility model can be made a variety of changes, be the protection scope of the utility model.
Claims (9)
1. a kind of load drives abnormity protection circuit, it is characterised in that: described including first switch, second switch and controller
First switch and the second switch are connected in load driving circuits, and the first switch is parallel with the first detection circuit, institute
It states second switch and is parallel with the second detection circuit, the voltage difference at the first detection circuit detection first switch both ends, and export
First detection signal, the voltage difference at the second detection circuit detection second switch both ends, and export the second detection signal；
The controller receives the first detection signal and the second detection signal；
The controller issues the closing or opening that first control signal is used to control first switch, or issues second control signal
For controlling the closing or opening of second switch；
The controller is according to first detection signal and first control signal and the second detection signal and second control signal, control
It makes the first switch or second switch disconnects.
2. load driving abnormity protection circuit as described in claim 1, it is characterised in that: the first switch have it is multiple, it is more
A first switch and after second switch series connection accesses corresponding load driving circuits.
3. load driving abnormity protection circuit as described in claim 1, it is characterised in that: the detection circuit includes optocoupler,
The optocoupler includes photophore and light-receiving device, is parallel to control switch both ends, institute after photophore and the resistance series connection of the optocoupler
State the output end output detection signal of the light-receiving device of optocoupler.
4. load as described in any one of claims 1-3 drives abnormity protection circuit, it is characterised in that: the load is exchange
Load.
5. load driving abnormity protection circuit as claimed in claim 4, it is characterised in that: the first switch and the second switch
It is relay or silicon-controlled.
6. load as described in any one of claims 1-3 drives abnormity protection circuit, it is characterised in that: the load is direct current
Load.
7. load driving abnormity protection circuit as claimed in claim 6, it is characterised in that: the first switch and the second switch
It is relay or semiconductor switch pipe.
8. load as described in any one of claims 1-3 drives abnormity protection circuit, it is characterised in that: the controller is single
Piece machine.
9. a kind of washing machine, it is characterised in that: the washing machine includes that load driving a method as claimed in any one of claims 1-8 is different
Often protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920084531.1U CN209217691U (en) | 2019-01-18 | 2019-01-18 | A kind of load driving abnormity protection circuit and washing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920084531.1U CN209217691U (en) | 2019-01-18 | 2019-01-18 | A kind of load driving abnormity protection circuit and washing machine |
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| CN209217691U true CN209217691U (en) | 2019-08-06 |
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| CN201920084531.1U Active CN209217691U (en) | 2019-01-18 | 2019-01-18 | A kind of load driving abnormity protection circuit and washing machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253629A (en) * | 2020-05-09 | 2021-08-13 | 九阳股份有限公司 | Control circuit for electric heating kettle and electric heating kettle |
| CN114530911A (en) * | 2022-02-25 | 2022-05-24 | 苏州浪潮智能科技有限公司 | Power supply protection method and device, power supply protection circuit, equipment and medium |
-
2019
- 2019-01-18 CN CN201920084531.1U patent/CN209217691U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253629A (en) * | 2020-05-09 | 2021-08-13 | 九阳股份有限公司 | Control circuit for electric heating kettle and electric heating kettle |
| CN114530911A (en) * | 2022-02-25 | 2022-05-24 | 苏州浪潮智能科技有限公司 | Power supply protection method and device, power supply protection circuit, equipment and medium |
| CN114530911B (en) * | 2022-02-25 | 2024-01-09 | 苏州浪潮智能科技有限公司 | Power supply protection method, device, power supply protection circuit, equipment and medium |
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