CN208672722U - A kind of DC load fault condition detection circuit - Google Patents
A kind of DC load fault condition detection circuit Download PDFInfo
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- CN208672722U CN208672722U CN201821281206.6U CN201821281206U CN208672722U CN 208672722 U CN208672722 U CN 208672722U CN 201821281206 U CN201821281206 U CN 201821281206U CN 208672722 U CN208672722 U CN 208672722U
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Abstract
The utility model discloses a kind of DC load fault condition detection circuits.It includes controller, power supply VCC1, power supply VCC2, relay RY2, switch module and feed circuit, and the feed circuit includes diode D2, diode D3, resistance R12, resistance R14, resistance R16, resistance R17, triode Q3, capacitor C7.The utility model circuit is simple and reliable, and the number of devices used is few, and failure rate is low, and cost is relatively low, does not introduce amplifier device, and strong antijamming capability is not likely to produce erroneous judgement.
Description
Technical field
The utility model relates to fault detection technique fields, especially relate to a kind of DC load fault condition detection circuit.
Background technique
Existing field of household appliances, many products all use some low-voltage direct accessories such as pump, valve, to control the stream of liquid
To or pipeline on-off, and these loads are in use if damage, and consumer cannot intuitively accuse these failures very much
Tell the after-sales service personnel of product, after-sales service personnel can not quickly position the device of damage, and replace in time.
Existing DC load fault condition detection circuit is after being divided by sampling resistor, by amplifier to faint electricity
Signal enhanced processing is pressed, then is sampled by the AD mouth of single-chip microcontroller, detects the working condition of load, but this detection mode needs
More accurate current sampling resistor and amplifier are used, single-chip microcontroller also needs AD mouthfuls of resources of configuration, and the device that circuit is used is more, leads
Cause overall failure rate higher, higher cost can also amplify interference signal, be easy to cause erroneous judgement due to introducing amplifier.
Summary of the invention
In order to solve the above-mentioned technical problem the utility model, provides a kind of DC load fault condition detection circuit,
Circuit is simple and reliable, and the number of devices used is few, and failure rate is low, and cost is relatively low, does not introduce amplifier device, anti-interference ability
By force, it is not likely to produce erroneous judgement.
To solve the above-mentioned problems, the utility model is achieved using following technical scheme:
A kind of DC load fault condition detection circuit of the utility model, including controller, power supply VCC1, power supply
VCC2, relay RY2, switch module and feed circuit, the feed circuit include diode D2, diode D3, resistance R12,
Resistance R14, resistance R16, resistance R17, triode Q3, capacitor C7, coil first end and the power supply VCC1 of relay RY2 are electrically connected
It connects, the coil second end of relay RY2 is grounded by switch module, and the control terminal of switch module and the output end of controller are electrically connected
It connects, normally opened contact switch one end of relay RY2 is electrically connected with the power vd D of powering load, the normally opened contact of relay RY2
The switch other end is electrically connected with load anode, and diode D2 anode is electrically connected with load cathode, the one end resistance R16, diode D2
Cathode is grounded by diode D3, and the resistance R16 other end is electrically connected with the base stage of the one end resistance R17, triode Q3, triode Q3
Collector be electrically connected with the one end resistance R12, the one end resistance R14, the resistance R12 other end is electrically connected with power supply VCC2, resistance R14
The other end is electrically connected with the input terminal of the one end capacitor C7, controller, the capacitor C7 other end, the resistance R17 other end, triode Q3
Emitter is all grounded.
In the technical scheme, controller is powered by the coil that switch module controls relay RY2, relay RY2's
Normally opened contact switch closure.
If load is normal, there is operating current followed by load, diode D2, diode D3 to GND, in diode D2
Anode have the voltage of about 1.4V, triode Q3 conducting, the input terminal input low level of controller.
If load faulty causes to open a way, diode D2 and diode D3 are flowed through without electric current, in the anode of diode D2
Upper no voltage, triode Q3 cut-off, the input terminal input high level of controller.
Controller according to input terminal input be low level or high level judge load whether failure.
This programme is connected in series in load circuit using two diodes (silicone tube), using the C-V characteristic of diode, negative
When load circuit is normal or abnormal, triode Q3 is allowed to be on or end working condition respectively, collector exports stable height
Working condition of the level signal for controller detection load.
Preferably, the switch module includes resistance R13, resistance R15, triode Q2, the one end resistance R13 and controller
Output end electrical connection, the resistance R13 other end is electrically connected with the base stage of the one end resistance R15, triode Q2, the current collection of triode Q2
Pole is electrically connected with the coil second end of relay RY2, and the emitter of the resistance R15 other end and triode Q2 are all grounded.
Preferably, the controller is single-chip microcontroller.
The beneficial effects of the utility model are: circuit is simple and reliable, the number of devices used is few, and failure rate is low, cost compared with
It is low, amplifier device is not introduced, strong antijamming capability is not likely to produce erroneous judgement.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.
Embodiment: a kind of DC load fault condition detection circuit of the present embodiment, as shown in Figure 1, including controller, electricity
Source VCC1, power supply VCC2, relay RY2, switch module and feed circuit, switch module include resistance R13, resistance R15, three poles
Pipe Q2, feed circuit include diode D2, diode D3, resistance R12, resistance R14, resistance R16, resistance R17, triode Q3,
Capacitor C7, the one end resistance R13 are electrically connected with the output end of controller, the resistance R13 other end and the one end resistance R15, triode Q2
Base stage electrical connection, the collector of triode Q2 is electrically connected with the coil second end of relay RY2, the resistance R15 other end and three
The emitter of pole pipe Q2 is all grounded, and the coil first end of relay RY2 is electrically connected with power supply VCC1, the normally opened touching of relay RY2
Point switch one end is electrically connected with the power vd D of powering load, the normally opened contact switch other end and load anode of relay RY2
Electrical connection, diode D2 anode are electrically connected with load cathode, the one end resistance R16, diode D2 cathode and diode D3 anode electricity
Connection, diode D3 cathode ground connection, the resistance R16 other end are electrically connected with the base stage of the one end resistance R17, triode Q3, triode
The collector of Q3 is electrically connected with the one end resistance R12, the one end resistance R14, and the resistance R12 other end is electrically connected with power supply VCC2, resistance
The R14 other end is electrically connected with the input terminal of the one end capacitor C7, controller, the capacitor C7 other end, the resistance R17 other end, triode
The emitter of Q3 is all grounded.
Controller is single-chip microcontroller.Controller is powered by the coil that switch module controls relay RY2, relay RY2's
Normally opened contact switch closure.
If load is normal, there is operating current followed by load, diode D2, diode D3 to GND, in diode D2
Anode have the voltage of about 1.4V, triode Q3 conducting, the input terminal input low level of controller.
If load faulty causes to open a way, diode D2 and diode D3 are flowed through without electric current, in the anode of diode D2
Upper no voltage, triode Q3 cut-off, the input terminal input high level of controller.
Controller according to input terminal input be low level or high level judge load whether failure.
This programme is connected in series in load circuit using two diodes (silicone tube), using the C-V characteristic of diode, negative
When load circuit is normal or abnormal, triode Q3 is allowed to be on or end working condition respectively, collector exports stable height
Working condition of the level signal for controller detection load.
Claims (3)
1. a kind of DC load fault condition detection circuit, which is characterized in that including controller, power supply VCC1, power supply VCC2, after
Electric appliance RY2, switch module and feed circuit, the feed circuit include diode D2, diode D3, resistance R12, resistance R14,
The coil first end of resistance R16, resistance R17, triode Q3, capacitor C7, relay RY2 are electrically connected with power supply VCC1, relay
The coil second end of RY2 is grounded by switch module, and the control terminal of switch module is electrically connected with the output end of controller, relay
Normally opened contact switch one end of RY2 is electrically connected with the power vd D of powering load, and the normally opened contact switch of relay RY2 is another
End is electrically connected with load anode, and diode D2 anode is electrically connected with load cathode, the one end resistance R16, and diode D2 cathode passes through
Diode D3 ground connection, the resistance R16 other end are electrically connected with the base stage of the one end resistance R17, triode Q3, the collector of triode Q3
Be electrically connected with the one end resistance R12, the one end resistance R14, the resistance R12 other end is electrically connected with power supply VCC2, the resistance R14 other end with
The one end capacitor C7, controller input terminal electrical connection, the capacitor C7 other end, the resistance R17 other end, triode Q3 emitter all
Ground connection.
2. a kind of DC load fault condition detection circuit according to claim 1, which is characterized in that the switch module
Including resistance R13, resistance R15, triode Q2, the one end resistance R13 is electrically connected with the output end of controller, the resistance R13 other end
It is electrically connected with the base stage of the one end resistance R15, triode Q2, the collector of triode Q2 and the coil second end electricity of relay RY2
The emitter of connection, the resistance R15 other end and triode Q2 are all grounded.
3. a kind of DC load fault condition detection circuit according to claim 1, which is characterized in that the controller is
Single-chip microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821281206.6U CN208672722U (en) | 2018-08-09 | 2018-08-09 | A kind of DC load fault condition detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821281206.6U CN208672722U (en) | 2018-08-09 | 2018-08-09 | A kind of DC load fault condition detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208672722U true CN208672722U (en) | 2019-03-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821281206.6U Active CN208672722U (en) | 2018-08-09 | 2018-08-09 | A kind of DC load fault condition detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208672722U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111412629A (en) * | 2020-03-30 | 2020-07-14 | 珠海格力电器股份有限公司 | Load control device, air conditioner and load control method of air conditioner |
-
2018
- 2018-08-09 CN CN201821281206.6U patent/CN208672722U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111412629A (en) * | 2020-03-30 | 2020-07-14 | 珠海格力电器股份有限公司 | Load control device, air conditioner and load control method of air conditioner |
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