CN108899874A - A kind of monitoring circuit, dust catcher and monitoring method - Google Patents
A kind of monitoring circuit, dust catcher and monitoring method Download PDFInfo
- Publication number
- CN108899874A CN108899874A CN201810619837.2A CN201810619837A CN108899874A CN 108899874 A CN108899874 A CN 108899874A CN 201810619837 A CN201810619837 A CN 201810619837A CN 108899874 A CN108899874 A CN 108899874A
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- Prior art keywords
- voltage
- control circuit
- brush motor
- earth brush
- sampling resistor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
Abstract
The invention discloses a kind of monitoring circuits, are applied to dust catcher, the dust catcher includes earth brush motor, adapter, battery and the earth brush motor control circuit and charging control circuit that are separately connected the battery, and the monitoring circuit includes：Sampling resistor, described sampling resistor one end connect the adapter or the earth brush motor, and the other end connects the battery；The monitoring circuit further includes：Amplifier module and processing module；Wherein, the amplifier module determines detection voltage for obtaining and amplifying the voltage of the sampling resistor, and according to the voltage after enhanced processing；The processing module, for indicating that the earth brush motor control circuit or the charging control circuit disconnect according to the detection voltage.The invention also discloses a kind of dust catcher and monitoring methods.
Description
Technical field
The present invention relates to voltage detecting technology more particularly to a kind of monitoring circuits, dust catcher and monitoring method.
Background technique
Currently, dust catcher overall structure tends to lightweight, cause to install inside dust catcher printed circuit board (PCBA,
Printed Circuit Board+Assembly) space substantially reduces, the security performance of electric control part is required it is stringenter,
It needs to play when over current of motor, short circuit or charging overcurrent occurs in dust catcher and movement is effectively protected, to protect the master of dust catcher
Control module.
Summary of the invention
In view of this, an embodiment of the present invention is intended to provide a kind of monitoring circuit, dust catcher and monitoring methods.
In order to achieve the above objectives, the technical proposal of the invention is realized in this way：
The embodiment of the invention provides a kind of monitoring circuits, are applied to dust catcher, and the dust catcher includes earth brush motor, fits
Orchestration, battery and the earth brush motor control circuit and charging control circuit that are separately connected the battery, the monitoring circuit packet
It includes：Sampling resistor, described sampling resistor one end connect the earth brush motor or the adapter, and the other end connects the battery；
The monitoring circuit further includes：Amplifier module and processing module；Wherein,
The amplifier module, for obtaining and amplifying the voltage of the sampling resistor, and according to the voltage after enhanced processing
Determine detection voltage；
The processing module, for indicating that the earth brush motor control circuit or the charging are controlled according to the detection voltage
Circuit processed disconnects.
In above scheme, the voltage of the sampling resistor is first voltage or second voltage；Wherein, the first voltage is
The voltage obtained according to the electric current that the anode of the battery flows to the sampling resistor；The second voltage is according to the battery
Cathode flow to the sampling resistor electric current obtain voltage；
The processing module, for detecting voltage to the earth brush motor control according to correspond to the first voltage first
Circuit processed sends the first control instruction, to disconnect the earth brush motor control circuit；Alternatively, according to the second voltage is corresponded to
Second detection voltage to the charging control circuit send the second control instruction, to disconnect the charging control circuit.
In above scheme, the monitoring circuit further includes：Trigger module；
The trigger module, for exporting trigger signal to the processing module according to the detection voltage；The triggering
Signal indicates that the earth brush motor control circuit disconnects for the processing module.
In above scheme, the amplifier module includes operational amplifier；
The non-inverting input terminal of the operational amplifier connects the sampling resistor, the output end connection of the operational amplifier
The trigger module and the processing module.
In above scheme, the trigger module includes field effect transistor；The first port of the field effect transistor connects
The operational amplifier is connect, the second port of the field effect transistor receives operating voltage and connects the processing module, institute
State the third port ground connection of field effect transistor.
In above scheme, the amplifier module further includes：First resistor, second resistance, 3rd resistor and the 4th resistance；
One end of the first resistor connects the non-inverting input terminal of the operational amplifier, and the other end receives the detection electricity
Pressure；
One end of the second resistance connects the inverting input terminal of the operational amplifier, other end ground connection；
One end of the 3rd resistor connects the inverting input terminal of the operational amplifier, and the other end connects the fortune
Calculate the output end of amplifier；
One end of 4th resistance connects the non-inverting input terminal of the operational amplifier, and the other end receives work electricity
Pressure.
In above scheme, the circuit further includes voltage reduction module, and the voltage reduction module includes low pressure difference linear voltage regulator
(LDO, Low Dropout Regulator)；
The output end of the LDO connects the processing module, and the input terminal of the LDO connects the anode of the battery.
The embodiment of the invention also provides a kind of dust catcher, the dust catcher includes any one above-described monitoring electricity
Road.
The embodiment of the invention also provides a kind of monitoring method, the method is applied to any one above-described monitoring
Circuit, the method includes：
The voltage of the sampling resistor is obtained and amplified, and detection voltage is determined according to the voltage after enhanced processing；
Indicate that the earth brush motor control circuit or the charging control circuit disconnect according to the detection voltage.
In above scheme, the voltage of the sampling resistor is first voltage or second voltage；Wherein, the first voltage is
The voltage obtained according to the electric current that the anode of the battery flows to the sampling resistor；The second voltage is according to the battery
Cathode flow to the sampling resistor electric current obtain voltage；
It is described to indicate that the earth brush motor control circuit or the charging control circuit disconnect according to the detection voltage, packet
It includes：
The first control is sent to the earth brush motor control circuit according to the first detection voltage for corresponding to the first voltage
System instruction, to disconnect the earth brush motor control circuit；Alternatively, according to correspond to the second voltage second detection voltage to
The charging control circuit sends the second control instruction, to disconnect the charging control circuit.
In above scheme, the first detection voltage that the basis corresponds to the first voltage is controlled to the earth brush motor
Circuit sends the first control instruction, including：
When determining the first detection voltage drop as low as first threshold, the first control is sent to the earth brush motor control circuit
System instruction；
The second detection voltage that the basis corresponds to the second voltage sends the second control to the charging control circuit
System instruction, including：
When determining that the second detection voltage increases to second threshold, the second control is sent to the charging control circuit and is referred to
It enables.
In above scheme, the dust catcher further includes：Trigger module；The method also includes：
The trigger module is received according to the trigger signal of the detection voltage output；Institute is indicated according to the trigger signal
State the disconnection of earth brush motor control circuit.
A kind of monitoring circuit, dust catcher provided by the embodiment of the present invention and monitoring method, the dust catcher include scrubbing brush
Motor, adapter, battery and the earth brush motor control circuit and charging control circuit that are separately connected the battery, the monitoring
Circuit includes：Sampling resistor, described sampling resistor one end connect the earth brush motor or the adapter, described in other end connection
Battery；The monitoring circuit further includes：Amplifier module and processing module；Wherein, the amplifier module, for obtaining and amplifying institute
The voltage of sampling resistor is stated, and detection voltage is determined according to the voltage after enhanced processing；The processing module, for according to
It detects voltage and indicates that the earth brush motor control circuit or the charging control circuit disconnect.Side provided in an embodiment of the present invention
Case, the interior detection for realizing over current of motor, short circuit and the overcurrent that charges, can accurately identify over current of motor, short circuit in a limited space
With charging overcurrent, and corresponding protection act is made, provide circuit safety guarantee for dust catcher.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for monitoring circuit provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of dust catcher provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another dust catcher provided in an embodiment of the present invention；
Fig. 4 is a kind of flow diagram of monitoring method provided in an embodiment of the present invention.
Specific embodiment
In the embodiment of the present invention, a kind of monitoring circuit applied to dust catcher, the dust catcher includes earth brush motor, adaptation
Device, battery and the earth brush motor control circuit and charging control circuit that are separately connected the battery, the monitoring circuit include：
Sampling resistor, described sampling resistor one end connect the earth brush motor or the adapter, and the other end connects the battery；It is described
Monitoring circuit further includes：Amplifier module and processing module；Wherein, the amplifier module, for obtaining and amplifying the sampling electricity
The voltage of resistance, and detection voltage is determined according to the voltage after enhanced processing；The processing module, for according to the detection voltage
Indicate that the earth brush motor control circuit or the charging control circuit disconnect.
Below with reference to embodiment, the present invention is further described in more detail.
Fig. 1 is a kind of structural schematic diagram for monitoring circuit provided in an embodiment of the present invention；As shown in Figure 1, the monitoring electricity
Road is applied to dust catcher, and the dust catcher includes earth brush motor, adapter, battery and the scrubbing brush electricity for being separately connected the battery
Machine control circuit and charging control circuit.
In the present embodiment, the monitoring circuit works as determination for detecting whether the earth brush motor occurs overcurrent or short circuit
When overcurrent or short circuit occur for the earth brush motor, the earth brush motor control circuit is disconnected, earth brush motor is made to stop working；With
And the overcurrent that charges whether occurs when detecting the adaptor charge, when charging overcurrent occurring when determining the adaptor charge,
The charging control circuit is disconnected, charging is stopped.
Here, the monitoring circuit using resistance sampling mode detect the earth brush motor whether occur overcurrent or short circuit,
Whether occur when detecting the adaptor charge charge overcurrent, and indicate according to testing result the earth brush motor control circuit or
Charging control circuit disconnects.
Specifically, the monitoring circuit, including：Sampling resistor；Described sampling resistor one end connect the adapter or
The earth brush motor, the other end connect the battery.
The monitoring circuit, including：Amplifier module and processing module；Wherein,
The amplifier module, for obtaining and amplifying the voltage of the sampling resistor, and according to the voltage after enhanced processing
Determine detection voltage；
The processing module, for indicating that the earth brush motor control circuit or the charging are controlled according to the detection voltage
Circuit processed disconnects.
Here, one end of the sampling resistor connects the cathode of the adapter or the cathode of the earth brush motor, another
End connects the amplifier module；Specifically, the input terminal of the amplifier module connects the sampling resistor, the amplifier module
Output end connect the input terminal of the processing module, the output end of the processing module connects the earth brush motor control circuit
And charging control circuit.The detection voltage obtained according to the voltage of the sampling resistor is sent to by the amplifier module
The processing module is realized according to the detection voltage by the processing module and is controlled to the earth brush motor control circuit and charging
The monitoring of circuit processed.
Specifically, the voltage of the sampling resistor is first voltage or second voltage；Wherein, the first voltage is root
The voltage obtained according to the electric current that the anode of the battery flows to the sampling resistor；The second voltage is according to the battery
Cathode flows to the voltage that the electric current of the sampling resistor obtains；The voltage of sampling resistor is denoted as described when dust catcher being discharged
One voltage, the voltage of sampling resistor is denoted as the second voltage when dust catcher is charged.
Here, it is further illustrated for the first voltage and the second voltage；
The electric current that the anode of the battery flows to the sampling resistor is denoted as the first electric current, when first electric current flows through
When the sampling resistor, the voltage that the sampling resistor both ends obtain is first voltage；Here, the flow direction of first electric current
Specially：The anode of battery → earth brush motor control loop → earth brush motor → sampling resistor → battery cathode；
The electric current that the cathode of the battery flows to the sampling resistor is denoted as the second electric current, when second electric current flows through
When the sampling resistor, the voltage that the sampling resistor both ends obtain is second voltage；The flow direction of second electric current is specific
For：The anode of adapter → charge control loop → battery anode → inside battery → battery cathode → sampling resistor → suitable
The cathode of orchestration.
The processing module, for detecting voltage to the earth brush motor control according to correspond to the first voltage first
Circuit processed sends the first control instruction, to disconnect the earth brush motor control circuit；Alternatively, according to the second voltage is corresponded to
Second detection voltage to the charging control circuit send the second control instruction, to disconnect the charging control circuit.
Specifically, when the amplifier module for the voltage in the sampling resistor is first voltage, described the is obtained
One voltage amplifies processing to the first voltage, determines the first detection voltage according to the first voltage after enhanced processing；Or
Person obtains the second voltage, amplifies place to the second voltage when the voltage of the sampling resistor is second voltage
Reason, determines the second detection voltage according to the second voltage after enhanced processing.
Correspondingly, the processing module, for detecting voltage to institute according to correspond to the first voltage described first
It states earth brush motor control circuit and sends the first control instruction, to disconnect the earth brush motor control circuit；Alternatively, according to corresponding to
The second detection voltage of the second voltage sends the second control instruction to the charging control circuit, to fill described in disconnection
Electric control circuit.
Specifically, the processing module preserves first threshold and second threshold；Here, the first threshold and described
Second threshold is preset by circuit designer and is stored in the processing module；When the processing module determines described
When one detection voltage drop is as low as first threshold, determines that overcurrent occurs for the earth brush motor, sent out to the earth brush motor control circuit
The first control instruction is sent, to disconnect the earth brush motor control circuit；When the processing module determines the second detection voltage
When increasing to second threshold, charging overcurrent occurs when determining the adaptor charge, sends second to the charging control circuit
Control instruction, to disconnect the charging control circuit.
In practical application, the processor can pass through central processing unit (CPU, Central Processing Unit), number
Word signal processor (DSP, Digital Signal Processor), micro-control unit (MCU, Microcontroller
Unit) or programmable gate array (FPGA, Field-Programmable Gate Array) is realized.
Specifically, the amplifier module includes operational amplifier；Described in the non-inverting input terminal connection of the operational amplifier
Sampling resistor, output end connect trigger module and the processing module.
Here, the operational amplifier receives the voltage of the sampling resistor, puts to the voltage of the sampling resistor
Big processing obtains detection voltage according to the voltage of the sampling resistor after enhanced processing.
Specifically, the monitoring circuit can also include：Trigger module；
The trigger module, for exporting trigger signal to the processing module according to the detection voltage；The triggering
Signal indicates that the earth brush motor control circuit disconnects for the processing module.
Specifically, the trigger module includes field effect transistor；The first port of the field effect transistor connects institute
Operational amplifier is stated, the second port of the field effect transistor receives operating voltage and connects the processing module, the field
The third port of effect transistor is grounded.
Here, the field effect transistor can be technotron (JFET) or isolated gate FET (metal-oxide-semiconductor)；
By taking metal-oxide-semiconductor as an example, the output end that pole grid (G) of the metal-oxide-semiconductor, i.e. first port connect the operational amplifier, leakage pole (D),
I.e. second port receives operating voltage and connects the processing module, and the pole source (S), i.e. third port are grounded.Here, the work
Voltage can be 3.3V.
It should be noted that needing in short-term here it is considered that earth brush motor short-circuit ratio earth brush motor overcurrent is more dangerous
Interior to be protected, therefore, monitoring circuit described in the present embodiment further includes having trigger module.Circuit designer is set in circuit
The conducting voltage of the trigger module (here by taking metal-oxide-semiconductor as an example) is set as by timing：Fortune when with the earth brush motor short circuit
The identical voltage value of detection voltage of amplification module output.When the earth brush motor short circuit, electric current becomes larger, by the amplifier mould
The amplified detection voltage of block is greater than the conducting voltage of the metal-oxide-semiconductor, when the metal-oxide-semiconductor receives the detection voltage and is connected
When, low level signal (the i.e. described trigger signal) can be exported to the processing module, the processing module receives the low electricity
After ordinary mail number, that is, it can determine the earth brush motor short circuit, then the processing module sends first control instruction to describedly
Brush motor control circuit, to disconnect the earth brush motor control circuit, earth brush motor stops working, and carries out circuit in a short time
Protection.
Specifically, the amplifier module further includes：First resistor, second resistance, 3rd resistor and the 4th resistance；
One end of the first resistor connects the non-inverting input terminal of the operational amplifier, and the other end receives the detection electricity
Pressure；
One end of the second resistance connects the inverting input terminal of the operational amplifier, other end ground connection；
One end of the 3rd resistor connects the inverting input terminal of the operational amplifier, and the other end connects the operation and puts
The output end of big device；
One end of 4th resistance connects the non-inverting input terminal of the operational amplifier, and the other end receives operating voltage.
When design monitors circuit, by the resistance that the first resistor, second resistance, 3rd resistor and the 4th resistance is arranged
Value, may be implemented the configuration of the amplification factor to the operational amplifier.
Specifically, the monitoring circuit further includes voltage reduction module, and the voltage reduction module includes LDO；
When the monitoring circuit includes the LDO, the output end of the LDO connects the processing module, and the LDO's is defeated
Enter the anode that end connects the battery, the LDO is used to provide the electricity for supporting the processing module to work to the processing module
Pressure.
Fig. 2 is a kind of structural schematic diagram of dust catcher provided in an embodiment of the present invention；As shown in Fig. 2, the dust catcher packet
Include earth brush motor, battery and the earth brush motor control circuit and charging control circuit that are separately connected the battery；The dust catcher
It further include interface, the earth brush motor control circuit is connect by the interface with the earth brush motor.The dust catcher also wraps
Include monitoring circuit；The monitoring circuit indicates institute for detecting whether earth brush motor occurs overcurrent, short circuit according to testing result
State the disconnection of earth brush motor control circuit.
Here, the monitoring circuit includes：Sampling resistor R14；The one end the sampling resistor R14 passes through described in interface connection
Earth brush motor, the other end connect the battery BT1；
The monitoring circuit further includes：Amplifier module, trigger module and processing module；Here, as an implementation,
The processing module can be realized by MCU；
The amplifier module includes operational amplifier U3A；Here, as an implementation, the operational amplifier can
Using the operational amplifier of LMV358 model；
The trigger module includes field effect transistor；Here, as an implementation, the field effect transistor can
To use metal-oxide-semiconductor Q18.
In the present embodiment, the operational amplifier LMV358 is obtained according to supply current I2_Moto and the sampling resistor
The supply voltage (voltage of the i.e. described sampling resistor) that R14 is obtained, here, the value of the supply voltage are equal to the supply current
I2_Moto multiplied by resistance R14 value；Processing is amplified to the supply voltage, is obtained according to the supply voltage after enhanced processing
Voltage V must be detectedout。
The supply voltage is first voltage, and here, supply voltage when dust catcher is discharged is denoted as first voltage；It will be right
The detection voltage that processing obtains, which is amplified, according to the first voltage is denoted as the first detection voltage.
For attached drawing 2, the first voltage is the voltage that the first electric current flows through that the sampling resistor obtains；Described
The flow direction of one electric current is：The anode of battery BT1 → earth brush motor control loop → earth brush motor → sampling resistor → battery BT1
Cathode；
The MCU determines the first detection voltage VoutWhen being reduced to first threshold, sent to the earth brush motor control circuit
First control instruction, to disconnect the earth brush motor control circuit；
Alternatively, the metal-oxide-semiconductor Q18 receives the first detection voltage VoutAnd when being connected, low level signal is exported to the MCU
(i.e. trigger signal), the MCU receives low level signal and then sends first control instruction to be controlled to the earth brush motor
Circuit, to disconnect the earth brush motor control circuit.
It should be noted that the supply voltage amplifies processing, the operation through the operational amplifier LMV358
Amplifier LMV358 is according to the supply voltage output detection voltage after enhanced processing.When design monitors circuit, circuit design people
Member can configure the amplification factor of the operational amplifier LMV358 by R30, R31, R24, R28, and meet the scrubbing brush
When over current of motor, the detection voltage VoutThe requirement of conducting voltage lower than metal-oxide-semiconductor Q18.
Here, the non-inverting input terminal of the operational amplifier LMV358 is provided with operating voltage (operating voltage is
3.3V).The operational amplifier LMV358 output end output detection voltage be：
Wherein, R30 is the resistance value of the first resistor, R28 is the resistance value of the second resistance, R24 is the third electricity
The resistance value of resistance, the resistance value that R31 is the 4th resistance.
Fig. 3 is the structural schematic diagram of another dust catcher provided in an embodiment of the present invention；As shown in figure 3, the dust catcher
Including adapter, battery and the earth brush motor control circuit and charging control circuit that are separately connected the battery；The dust catcher
It further include interface, the charging control circuit is connect by the interface with the adapter.The dust catcher further includes monitoring
Circuit；The monitoring circuit indicates according to testing result for the overcurrent that charges whether to occur when detecting the adaptor charge
The charging control circuit disconnects.
Here, the monitoring circuit includes：Sampling resistor R14；The one end the sampling resistor R14 is connected by the interface
The adapter, the other end connect the battery BT1；
The monitoring circuit further includes：Amplifier module, trigger module and processing module；Here, as an implementation,
The processing module can be realized by MCU；
The amplifier module includes operational amplifier U3A；Here, as an implementation, the operational amplifier can
Using the operational amplifier of LMV358 model；
The trigger module includes field effect transistor；Here, as an implementation, the field effect transistor can
To use metal-oxide-semiconductor Q18.
In the present embodiment, the operational amplifier LMV358 is obtained according to supply current I2_Moto and the sampling resistor
The supply voltage (voltage of the i.e. described sampling resistor) that R14 is obtained, here, the value of the supply voltage are equal to the supply current
I2_Moto multiplied by resistance R14 value；Processing is amplified to the supply voltage, is obtained according to the supply voltage after enhanced processing
Voltage V must be detectedout。
The supply voltage is second voltage, and here, supply voltage when dust catcher is charged is denoted as second voltage；It will be right
The detection voltage that processing obtains, which is amplified, according to the second voltage is denoted as the second detection voltage.
For attached drawing 3, the second voltage is the voltage that the second electric current flows through that the sampling resistor obtains；Described
The flow direction of two electric currents is：Anode → charge control loop → battery BT1 anode → inside battery → battery BT1 of adapter
Cathode → sampling resistor → adapter cathode.
The MCU determines the second detection voltage VoutWhen increasing to second threshold, second is sent to the charging control circuit
Control instruction, to disconnect the charging control circuit.
It should be noted that the supply voltage amplifies processing, the operation through the operational amplifier LMV358
Amplifier LMV358 is according to the supply voltage output detection voltage after enhanced processing.When design monitors circuit, circuit design people
Member can configure the amplification factor of the operational amplifier LMV358 by R30, R31, R24, R28, and meet the scrubbing brush
When over current of motor, voltage V is detectedoutThe requirement of conducting voltage lower than metal-oxide-semiconductor Q18.
The monitoring process of the monitoring circuit is said during being charged and discharged below in conjunction with Fig. 2 and Fig. 3 to dust catcher
It is bright：
When dust catcher runs (i.e. discharge process), scrubbing brush current direction flows to B point, the supply current I2_Moto by A point
Generate forward voltage drop；When the earth brush motor overcurrent, the supply current I2_Moto can change, the operation amplifier
First detection voltage V of device LMV358 outputoutAlso it changes therewith, the operational amplifier output overcurrent signal
(Overcurrent_Signal) MCU is given；The MCU determines the earth brush motor overcurrent according to the over-current signal, to
The earth brush motor control circuit sends the first control instruction, to disconnect earth brush motor control circuit, so that the earth brush motor
It stops working.Here, the over-current signal is the first detection voltage Vout, the MCU determines the first detection voltage VoutIt reduces
When to first threshold, earth brush motor overcurrent is determined, then send the first control instruction to the earth brush motor control circuit, to close
The earth brush motor control circuit.
When earth brush motor short circuit, the supply current I2_Moto can change, and the operational amplifier LMV358 is defeated
The first detection voltage V outoutThe conducting voltage of metal-oxide-semiconductor Q18 can be reached, the Short_Signal of the metal-oxide-semiconductor Q18 is by high electricity
It is flat to become low level, when the MCU detects low level, exports first control instruction and give earth brush motor control electricity
Road, to disconnect the earth brush motor control circuit, earth brush motor stops working.
When dust catcher charges, current direction flows to A point by B point, and the supply current I2_Moto generates negative sense pressure drop；When
When charging current is excessive, the supply current I2_Moto can change, the second inspection of the operational amplifier LMV358 output
Survey voltage VoutAlso it can change therewith, the operational amplifier output overcurrent signal (Overcurrent_Signal) gives institute
State MCU；When the MCU determines charging overcurrent according to the over-current signal, the second control is sent to the charging control circuit and is referred to
It enables, to disconnect charging control circuit, stops charging.Here over-current signal is the second detection voltage Vout, the MCU determination
The second detection voltage VoutWhen increasing to second threshold, charging overcurrent occurs when determining adaptor charge, then to the charging
Control circuit sends the second control instruction, to disconnect the charging control circuit, stops charging.
Fig. 4 is a kind of flow diagram of monitoring method provided in an embodiment of the present invention；The method is applied to shown in Fig. 1
Monitoring circuit, as shown in figure 4, the method includes：
Step 401, the voltage for obtaining and amplifying the sampling resistor, and detection electricity is determined according to the voltage after enhanced processing
Pressure；
Step 402 indicates that the earth brush motor control circuit or the charging control circuit are disconnected according to the detection voltage
It opens.
Specifically, the voltage of the sampling resistor is first voltage or second voltage；Wherein, according to the first voltage
The anode of the battery flows to the voltage that the electric current of the sampling resistor obtains；The second voltage is according to the negative of the battery
Pole flows to the voltage that the electric current of the sampling resistor obtains；
It is described to indicate that the earth brush motor control circuit or the charging control circuit disconnect according to the detection voltage, packet
It includes：
The first control is sent to the earth brush motor control circuit according to the first detection voltage for corresponding to the first voltage
System instruction, to disconnect the earth brush motor control circuit；Alternatively, according to correspond to the second voltage second detection voltage to
The charging control circuit sends the second control instruction, to disconnect the charging control circuit.
Here, the first detection voltage that the basis corresponds to the first voltage is sent out to the earth brush motor control circuit
The first control instruction is sent, including：
When determining the first detection voltage drop as low as first threshold, the first control is sent to the earth brush motor control circuit
System instruction；
Here, the second detection voltage that the basis corresponds to the second voltage sends the to the charging control circuit
Two control instructions, including：
When determining that the second detection voltage increases to second threshold, the second control is sent to the charging control circuit and is referred to
It enables.
Here, the monitoring circuit can preserve first threshold and second threshold；Here, the first threshold and described
Second threshold is preset by circuit designer and is stored in the monitoring circuit.
Specifically, the dust catcher further includes：Trigger module；The method also includes：
The trigger module is received according to the trigger signal of the detection voltage output；Institute is indicated according to the trigger signal
State the disconnection of earth brush motor control circuit.
Here, the trigger module can use field effect transistor；The field effect transistor can imitate for junction type field
(JFET) or isolated gate FET (metal-oxide-semiconductor) should be managed.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention, it is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and principles in the present invention, should be included in protection of the invention
Within the scope of.
Claims (12)
1. a kind of monitoring circuit, is applied to dust catcher, the dust catcher includes earth brush motor, adapter, battery and is separately connected
The earth brush motor control circuit and charging control circuit of the battery, which is characterized in that the monitoring circuit includes：Sampling electricity
Resistance, described sampling resistor one end connect the earth brush motor or the adapter, and the other end connects the battery；The monitoring electricity
Road further includes：Amplifier module and processing module；Wherein,
The amplifier module is determined for obtaining and amplifying the voltage of the sampling resistor, and according to the voltage after enhanced processing
Detect voltage；
The processing module, for indicating the earth brush motor control circuit or charge control electricity according to the detection voltage
Road disconnects.
2. monitoring circuit according to claim 1, which is characterized in that the voltage of the sampling resistor is first voltage or the
Two voltages；Wherein, the first voltage is the voltage for flowing to the electric current of the sampling resistor according to the anode of the battery and obtaining；
The second voltage is the voltage for flowing to the electric current of the sampling resistor according to the cathode of the battery and obtaining；
The processing module, for controlling electricity to the earth brush motor according to the first detection voltage for corresponding to the first voltage
Road sends the first control instruction, to disconnect the earth brush motor control circuit；Alternatively, according to corresponding to the of the second voltage
Two detection voltages send the second control instruction to the charging control circuit, to disconnect the charging control circuit.
3. monitoring circuit according to claim 1, which is characterized in that the monitoring circuit further includes：Trigger module；
The trigger module, for exporting trigger signal to the processing module according to the detection voltage；The trigger signal
Indicate that the earth brush motor control circuit disconnects for the processing module.
4. monitoring circuit according to claim 3, which is characterized in that the amplifier module includes operational amplifier；
The non-inverting input terminal of the operational amplifier connects the sampling resistor, described in the output end connection of the operational amplifier
Trigger module and the processing module.
5. monitoring circuit according to claim 4, which is characterized in that the trigger module includes field effect transistor；Institute
The first port for stating field effect transistor connects the operational amplifier, and the second port of the field effect transistor receives work
Voltage simultaneously connects the processing module, the third port ground connection of the field effect transistor.
6. monitoring circuit according to claim 4, which is characterized in that the amplifier module further includes：First resistor, second
Resistance, 3rd resistor and the 4th resistance；
One end of the first resistor connects the non-inverting input terminal of the operational amplifier, and the other end receives the detection voltage；
One end of the second resistance connects the inverting input terminal of the operational amplifier, other end ground connection；
One end of the 3rd resistor connects the inverting input terminal of the operational amplifier, and the other end connects the operation and puts
The output end of big device；
One end of 4th resistance connects the non-inverting input terminal of the operational amplifier, and the other end receives operating voltage.
7. monitoring circuit according to claim 1, which is characterized in that the circuit further includes voltage reduction module, the decompression
Module includes low pressure difference linear voltage regulator LDO；
The output end of the LDO connects the processing module, and the input terminal of the LDO connects the anode of the battery.
8. a kind of dust catcher, which is characterized in that the dust catcher includes the described in any item monitoring circuits of claim 1 to 7.
9. a kind of monitoring method, the method is applied to any monitoring circuit of claim 1 to 7, which is characterized in that described
Method includes：
The voltage of the sampling resistor is obtained and amplified, and detection voltage is determined according to the voltage after enhanced processing；
Indicate that the earth brush motor control circuit or the charging control circuit disconnect according to the detection voltage.
10. monitoring method according to claim 9, which is characterized in that the voltage of the sampling resistor be first voltage or
Second voltage；Wherein, the first voltage is the electricity for flowing to the electric current of the sampling resistor according to the anode of the battery and obtaining
Pressure；The second voltage is the voltage for flowing to the electric current of the sampling resistor according to the cathode of the battery and obtaining；
It is described to indicate that the earth brush motor control circuit or the charging control circuit disconnect according to the detection voltage, including：
The first control is sent to the earth brush motor control circuit according to the first detection voltage for corresponding to the first voltage to refer to
It enables, to disconnect the earth brush motor control circuit；Alternatively, according to the second detection voltage of the second voltage is corresponded to described
Charging control circuit sends the second control instruction, to disconnect the charging control circuit.
11. monitoring method according to claim 10, which is characterized in that the basis corresponds to the of the first voltage
One detection voltage sends the first control instruction to the earth brush motor control circuit, including：
When determining the first detection voltage drop as low as first threshold, the first control is sent to the earth brush motor control circuit and is referred to
It enables；
The second detection voltage that the basis corresponds to the second voltage sends the second control to the charging control circuit and refers to
It enables, including：
When determining that the second detection voltage increases to second threshold, the second control instruction is sent to the charging control circuit.
12. monitoring method according to claim 9, which is characterized in that the dust catcher further includes：Trigger module；It is described
Method further includes：
The trigger module is received according to the trigger signal of the detection voltage output；Describedly according to trigger signal instruction
Brush motor control circuit disconnects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810619837.2A CN108899874B (en) | 2018-06-14 | 2018-06-14 | Monitoring circuit, dust collector and monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810619837.2A CN108899874B (en) | 2018-06-14 | 2018-06-14 | Monitoring circuit, dust collector and monitoring method |
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| CN108899874A true CN108899874A (en) | 2018-11-27 |
| CN108899874B CN108899874B (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111317402A (en) * | 2018-12-17 | 2020-06-23 | 江苏美的清洁电器股份有限公司 | Control device and method of dust collector and dust collector |
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| CN101677733A (en) * | 2007-09-20 | 2010-03-24 | 三菱电机株式会社 | Electric vacuum cleaner |
| CN201518412U (en) * | 2009-11-02 | 2010-06-30 | 金莱克电气股份有限公司 | Control protective circuit for stalling of floor brushing motor |
| CN205693592U (en) * | 2016-06-15 | 2016-11-16 | 上海英恒电子有限公司 | A kind of three-phase brushless motor control system |
| CN107492867A (en) * | 2017-08-09 | 2017-12-19 | 深圳腾势新能源汽车有限公司 | Protection system for motor |
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| CN101677733A (en) * | 2007-09-20 | 2010-03-24 | 三菱电机株式会社 | Electric vacuum cleaner |
| CN201518412U (en) * | 2009-11-02 | 2010-06-30 | 金莱克电气股份有限公司 | Control protective circuit for stalling of floor brushing motor |
| CN205693592U (en) * | 2016-06-15 | 2016-11-16 | 上海英恒电子有限公司 | A kind of three-phase brushless motor control system |
| CN107492867A (en) * | 2017-08-09 | 2017-12-19 | 深圳腾势新能源汽车有限公司 | Protection system for motor |
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| CN111317402A (en) * | 2018-12-17 | 2020-06-23 | 江苏美的清洁电器股份有限公司 | Control device and method of dust collector and dust collector |
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| CN108899874B (en) | 2020-02-18 |
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