CN106848998B - A kind of power output protection circuit and device - Google Patents
A kind of power output protection circuit and device Download PDFInfo
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- CN106848998B CN106848998B CN201710112319.7A CN201710112319A CN106848998B CN 106848998 B CN106848998 B CN 106848998B CN 201710112319 A CN201710112319 A CN 201710112319A CN 106848998 B CN106848998 B CN 106848998B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
Abstract
The invention discloses a kind of power output protection circuit and devices, comprising: sampling module, switch control module and processing and control module；Wherein, received supply voltage is converted to sampled voltage by sampling module in proportion; processing and control module confirmation load short circuits or overcurrent when judging that sampled voltage is not more than default overcurrent voltage; cut-off control signal is sent to switch control module; control switch control module stops transmitting received supply voltage to sampling module, realizes overcurrent protection.Processing and control module sends conductivity control signal to switch control module when judging that sampled voltage is greater than default overcurrent voltage, control switch control module constant conduction is with to the received supply voltage of sampling module continuous transmission, it is transferred to power output end after dividing again by sampling module to received supply voltage, to power to the load.It can thus be avoided the problem of being damaged when load short circuits or overcurrent to the power supply of power input connection.
Description
Technical field
The present invention relates to electronic circuit technology field, in particular to a kind of power output protection circuit and device.
Background technique
In warning device, it is often necessary to which externally providing a low-voltage dc power supply (generally 12V) is detector, warning signal
And the external equipments power supply such as configuration keyboard.The electric current consumed by these external equipments work normally is simultaneously less and in order to drop
Low design cost, generally by low-voltage dc power supply and one power supply of power sharing for warning device power supply.However outside
There is abnormal or when by artificial destruction, such as short circuit or overcurrent in portion's equipment, may be to low-voltage dc power supply even power supply
It adversely affects, to influence the normal work of warning device, such as exceptional reset, fails to report.
Existing low-voltage dc power supply output protection circuit, mainly to realize based on overcurrent protection.And overcurrent protection is general
Mostly use series connection PTC (Positive Temperature Coefficient, posive temperature coefficient thermistor), fuse or base
In the electronic circuit protected mode of electric current winding detection.When using series connection PTC protected mode, although PTC has high reliablity
And the advantages such as maintenance cost is low, but the action response time of its overcurrent protection is longer, and over-current protection point is not accurate enough.It is using
When fuse protected mode, fuse has many advantages, such as that high reliablity and action response time are shorter, but can not be extensive after its fusing
It is multiple, cause maintenance cost higher.When using the electronic circuit protected mode detected based on electric current winding, with overcurrent protection
Point is relatively accurate, and protection act is timely, but since it generally carries out electric current winding detection by way of sampling resistor of connecting, and
Sampling resistor can have some impact on the normal work of load, and not prompt enough for abnormal high current failure response, from
And cause its reliability relatively low.
Summary of the invention
The embodiment of the present invention provides a kind of power output protection circuit and device, to improve reliability, reduce protection
Action response time and maintenance reduce cost.
Therefore, the embodiment of the invention provides a kind of power output protection circuits, comprising: sampling module, switch control mould
Block and processing and control module；Wherein,
The sampling module, for receiving the supply voltage of the switch control module transmission, and to the institute received
It states and is transferred to power output end after supply voltage is divided, and the supply voltage received is converted in proportion and is adopted
The processing and control module is transferred to after sample voltage；
The processing and control module, for receiving the sampled voltage, and the sampled voltage received in judgement is not
When greater than default overcurrent voltage, Xiang Suoshu switch control module sends cut-off control signal, in the sampling that judgement receives
When voltage is greater than default overcurrent voltage, continue to send conductivity control signal to the switch control module；
The switch control module, for receiving the supply voltage, the conductivity control signal and institute of power input
Cut-off control signal is stated, and transmits the power supply received to the sampling module when receiving the conductivity control signal
Voltage stops transmitting the supply voltage received to the sampling module when receiving the cut-off control signal.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the power supply output protection electricity
Road further include: Logic control module；The processing and control module passes through the Logic control module to the switch control module
Send cut-off control signal and the conductivity control signal；
The cut-off that the Logic control module is used to receive the sampled voltage and the processing and control module is sent
Signal is controlled, and the cut-off received control signal is transferred to the switch control module, and described for receiving
The conductivity control signal that sampled voltage and the processing and control module are sent, and the conductivity control signal that will be received
It is transferred to the switch control module.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the Logic control module packet
It includes: with door；Wherein,
The first input end with door is used to receive for receiving the sampled voltage, second input terminal with door
The cut-off control signal and the conductivity control signal, the output end with door that the processing and control module is sent are used for
The cut-off received control signal and the conductivity control signal are exported to the switch control module.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the sampling module includes: two
Pole pipe, the first transistor, first resistor, second resistance, 3rd resistor and the 4th resistance；Wherein,
The anode of the diode is used to receive the supply voltage of the switch control module transmission, cathode and the power supply
Output end is connected for the supply voltage after partial pressure to be transferred to the power output end；
The source electrode of the first end of the first resistor and the first transistor is connected with the anode of the diode,
The drain electrode of the second end of the first resistor and the first transistor is connected with the first end of the second resistance；
The second end of the second resistance is connected with the first end of the 3rd resistor, and the second of the second resistance
End is for exporting the sampled voltage；
The second end of the 3rd resistor is connected with ground terminal；
The first end of 4th resistance is connected with the cathode of the diode, the grid of second end and the first transistor
Extremely it is connected；
The default overcurrent voltage V0Meet formula:Wherein, UDRepresent leading for the diode
Logical pressure drop, r1Represent the resistance value of the first resistor, r2Represent the resistance value of the second resistance, r3Represent the third electricity
The resistance value of resistance.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the switch control module packet
It includes: second transistor, third transistor, the 5th resistance and the 6th resistance；Wherein,
The power supply that the source electrode of the second transistor is connected with the power input for receiving the power input
Voltage, drain electrode are used for transmission the supply voltage received, the first end and the third of grid and the 5th resistance
The source electrode of transistor is connected；
The second end of 5th resistance is connected with the source electrode of the second transistor；
The grid of the third transistor is connected with the first end of the 6th resistance, and drain electrode is connected with ground terminal；
The second end of 6th resistance controls signal for receiving the conductivity control signal and the cut-off.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the switch control module is also
It include: the 7th resistance and capacitor；Wherein
7th resistance is connected between the grid of the second transistor and the source electrode of the third transistor；
The capacitance connection is between the first end and its second end of the 5th resistance.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the power supply output protection electricity
Road further include: be connected to drive control module between the source electrode of the third transistor and the ground terminal；Wherein,
The processing and control module is also used to hold when the sampled voltage that judgement receives is greater than default overcurrent voltage
Continue and send conduction pulses driving signal to the drive control module, and is not more than in the sampled voltage that judgement receives
When default overcurrent voltage, Xiang Suoshu drive control module sends disabling pulse driving signal；
The drive control module is used to receive the conduction pulses driving signal and the disabling pulse driving signal, and
The source electrode and the ground terminal that the third transistor is connected when receiving the conduction pulses driving signal, receiving
The source electrode and the ground terminal of the third transistor are disconnected when stating disabling pulse driving signal.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the drive control module packet
It includes: the 4th transistor and the 8th resistance；Wherein,
The first end of 8th resistance is believed for receiving the conduction pulses driving signal and disabling pulse driving
Number, second end is connected with the grid of the 4th transistor；
The source electrode of 4th transistor is connected with the source electrode of the third transistor, the drain electrode of the 4th transistor with
The ground terminal is connected.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the power supply output protection electricity
Road further include: surge suppression modules；Wherein, the input terminal of the surge suppression modules is connected with the power output end；It is described
Surge suppression modules are used to prevent the surge voltage of the power output end from inputting the sampling module；And/or
The power output protection circuit further include: state indicator module；Wherein, the processing and control module is also used to
When judging that the sampled voltage received is not more than default overcurrent voltage, Xiang Suoshu state indicator module sends controlling alarm letter
Number；
The state indicator module is used for the alert after receiving the alarm control signal.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, in the power supply output protection
When circuit further includes surge suppression modules, the surge suppression modules include: transient voltage suppressor；Wherein, the wink
Time variant voltage inhibits the cathode of diode for the input terminal of the surge suppression modules, the anode of the transient voltage suppressor
It is connected with ground terminal；
When the power output protection circuit further includes state indicator module, the state indicator module includes: the 9th
Resistance and light emitting diode；Wherein, the first end of the 9th resistance is for receiving the alarm control signal, second end and institute
The anode for stating light emitting diode is connected, and the cathode of the light emitting diode is connected with the ground terminal.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the processing and control module packet
It includes: microcontroller；Wherein,
The receiving port of the microcontroller is for receiving the sampled voltage, and the first output port is for exporting described lead
Logical control signal and the cut-off control signal.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, in the power supply output protection
When circuit further includes drive control module, the microcontroller further include: for exporting the disabling pulse driving signal and institute
State the second output terminal mouth of conduction pulses driving signal；
When the power output protection circuit further includes state indicator module, the microcontroller further include: for defeated
The third output port of the alarm control signal out.
Preferably, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the power supply output protection electricity
Road further include: posive temperature coefficient thermistor；Wherein, the switch control module by the posive temperature coefficient thermistor to
The sampling module transmits the supply voltage received.
Correspondingly, the embodiment of the invention also provides a kind of power supply output protecting devices, including the embodiment of the present invention to provide
Any of the above-described kind of power output protection circuit.
The present invention has the beneficial effect that:
Power output protection circuit and device provided in an embodiment of the present invention, comprising: sampling module, switch control module with
And processing and control module；Wherein, received supply voltage is converted to by sampled voltage by sampling module in proportion, then is led to
It crosses the sampled voltage that receives of processing and control module judgement and whether is greater than default overcurrent voltage, and judging that sampled voltage is not more than
The load short circuits or overcurrent of power output end connection can be confirmed when default overcurrent voltage, and send and end to switch control module
Signal is controlled, control switch control module stops transmitting received supply voltage to sampling module, so that it is defeated to disconnect power supply
Enter the damage for the power supply that end and sampling module connect power input to avoid load short circuits or overcurrent, realizes that overcurrent is protected
Shield.When processing and control module judges that sampled voltage is greater than default overcurrent voltage, conducting control letter is sent to switch control module
Number, control switch control module constant conduction is with to the received supply voltage of sampling module continuous transmission, then passes through sampling
Module is transferred to power output end after dividing to received supply voltage, to power to the load.Therefore, by above-mentioned
The mutual cooperation of three modules, can be to avoid asking to the power supply damage of power input connection when load short circuits or overcurrent
Topic, to keep circuit more reliable and more stable.
Detailed description of the invention
Fig. 1 is one of the structural schematic diagram of power output protection circuit provided in an embodiment of the present invention；
Fig. 2 is the second structural representation of power output protection circuit provided in an embodiment of the present invention；
Fig. 3 a is the concrete structure schematic diagram of power output protection circuit shown in FIG. 1；
Fig. 3 b is the concrete structure schematic diagram of power output protection circuit shown in Fig. 2；
Fig. 3 c is the third structural representation of power output protection circuit provided in an embodiment of the present invention；
Fig. 3 d is the structural schematic diagram of power output protection circuit shown in Fig. 3 c.
Specific embodiment
In order to make the purpose of the present invention, the technical scheme and advantages are more clear, with reference to the accompanying drawing, to the embodiment of the present invention
The power output protection circuit of offer and the specific embodiment of device are described in detail.It should be appreciated that disclosed below
Preferred embodiment only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.And in the absence of conflict, originally
The feature in embodiment and embodiment in application can be combined with each other.
The embodiment of the invention provides a kind of power output protection circuits, as shown in Figure 1, comprising: sampling module 1, switch
Control module 2 and processing and control module 3；Wherein,
Sampling module 1, for receiving the supply voltage of the transmission of switch control module 2, and to the supply voltage received
It is transferred to power output end VOUT after being divided, and is passed after the supply voltage received is converted to sampled voltage in proportion
It is defeated by processing and control module 3；
Processing and control module 3, for receiving sampled voltage, and the sampled voltage received in judgement is not more than default overcurrent
When voltage, cut-off control signal is sent to switch control module 2, is greater than default overcurrent voltage in the sampled voltage that judgement receives
When, continue to send conductivity control signal to switch control module 2；
Switch control module 2, for receiving the supply voltage, conductivity control signal and cut-off control of power input VIN
Signal processed, and the supply voltage received is transmitted to sampling module 1 when receiving conductivity control signal, receiving cut-off control
Stop transmitting the supply voltage received to sampling module when signal processed.
Above-mentioned power output protection circuit provided in an embodiment of the present invention, comprising: sampling module, switch control module and
Processing and control module；Wherein, received supply voltage is converted to by sampled voltage by sampling module in proportion, then is passed through
Whether the sampled voltage that processing and control module judgement receives is greater than default overcurrent voltage, and is judging sampled voltage no more than pre-
If the load short circuits or overcurrent of power output end connection can be confirmed when overcurrent voltage, and cut-off control is sent to switch control module
Signal processed, control switch control module stops transmitting received supply voltage to sampling module, to disconnect power input
The damage for the power supply that end and sampling module connect power input to avoid load short circuits or overcurrent realizes that overcurrent is protected
Shield.When processing and control module judges that sampled voltage is greater than default overcurrent voltage, conducting control letter is sent to switch control module
Number, control switch control module constant conduction is with to the received supply voltage of sampling module continuous transmission, then passes through sampling
Module is transferred to power output end after dividing to received supply voltage, to power to the load.Therefore, the present invention is real
The above-mentioned power output protection circuit for applying example offer passes through the mutual cooperation of above three module, can be to avoid load short circuits or mistake
The problem of power supply of power input connection is damaged when stream, to keep circuit more reliable and more stable.
Further, when circuit is in and stablizes output state, when short circuit or over current fault occur for load, in order to
Power input VIN and sampling module 1 are quickly disconnected, the influence to power input VIN is reduced, in the specific implementation, at this
In the above-mentioned power output protection circuit that inventive embodiments provide, as shown in Fig. 2, power output protection circuit can also include:
Logic control module 4；Processing and control module 3 by Logic control module 4 to switch control module 2 send cut-off control signal and
Conductivity control signal；Wherein,
The cut-off control signal that Logic control module 4 is used to receive sampled voltage and processing and control module 3 is sent, and will connect
The cut-off control signal received is transferred to switch control module 2, and sends for receiving sampled voltage and processing and control module 3
Conductivity control signal, and the conductivity control signal received is transferred to switch control module 2.
Further, abnormal surge voltage is generated when load is switched in or out in order to prevent to power output protection circuit
Influence, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, as shown in Fig. 2, power supply
Output protection circuit can also include: surge suppression modules 5；Wherein,
The input terminal of surge suppression modules 5 is connected with power output end VOUT；Surge suppression modules 5 are for preventing power supply defeated
The surge voltage input sample module 1 of outlet VOUT.
Further, in order to be notified in time in load short circuits or overcurrent, in the specific implementation, in the present invention
In the above-mentioned power output protection circuit that embodiment provides, as shown in Fig. 2, power output protection circuit further include: state instruction
Module 6；Wherein,
Processing and control module 3 is also used to when the sampled voltage that judgement receives is not more than default overcurrent voltage, to state
Indicating module 6 sends alarm control signal；
State indicator module 6 is used for the alert after receiving alarm control signal.
Combined with specific embodiments below, the present invention is described in detail.It should be noted that be in the present embodiment in order to
It preferably explains the present invention, but does not limit the present invention.
Specifically, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, such as Fig. 3 a
To shown in Fig. 3 d, sampling module 1 be can specifically include: diode D, the first transistor M1, first resistor R1, second resistance R2,
3rd resistor R3 and the 4th resistance R4；Wherein,
The anode of diode D is used to receive the supply voltage of the transmission of switch control module 2, cathode and power output end VOUT
It is connected for the supply voltage after partial pressure to be transferred to power output end VOUT；
The first end of first resistor R1 and the source electrode of the first transistor M1 are connected with the anode of diode D, the first electricity
The drain electrode of the second end and the first transistor M1 that hinder R1 is connected with the first end of second resistance R2；
The second end of second resistance R2 is connected with the first end of 3rd resistor R3, and the second end of second resistance R2 is used for
Export sampled voltage；
The second end of 3rd resistor R3 is connected with ground terminal GND；
The first end of 4th resistance R4 is connected with the cathode of diode D, and second end is connected with the grid of the first transistor M1；
Default overcurrent voltage V0Meet formula:Wherein, UDRepresent the conduction voltage drop of diode, r1
Represent the resistance value of first resistor, r2Represent the resistance value of second resistance, r3Represent the resistance value of 3rd resistor.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, as shown in Figure 3a, the
One transistor M1 can be PNP triode, and the base stage of PNP triode is the grid of the first transistor M1 at this time, PNP triode
The current collection extremely source electrode of the first transistor M1, the transmitting extremely source electrode of the first transistor M1 of PNP triode.Certainly, first is brilliant
Body pipe M1 may be P type metal oxide semiconductor field-effect tube (MOS, Metal Oxide Scmiconductor).In reality
In the application of border, the specific structure of the first transistor M1 needs to design determination according to actual application environment, is not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, work as power output end
Connect load and when to load supplying, there is electric current between the anode of diode and its cathode, diode have stable pressure drop i.e. its
Conduction voltage drop.Due to the presence of the conduction voltage drop, the voltage difference V between the grid of the first transistor and its source electrode can be madegs
(M1) relationship between its threshold voltage vt h (M1) meets formula: | Vgs(M1) | > | Vth(M1) |, to make first crystal
Pipe conducting.Also, the conduction voltage drop of general diode is within the scope of 0.6V-0.7V.The threshold voltage V of the first transistorth(M1)
Generally within the scope of 0.5V-0.6V.In addition, outside can also be prevented since diode also has the function of reversely ending
Electric current reverse irrigation impacts power output protection circuit.In practical applications, the conduction voltage drop and the first transistor of diode
Threshold voltage need according to actual application environment to design determination, be not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, diode is silicon two
Pole pipe.It can make that there is a relatively-stationary conduction voltage drop between the anode of diode and its cathode in this way.Certainly, diode
It may be germanium diode.In practical applications, the specific structure of diode needs to design determination according to actual application environment,
It is not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, first resistor, second
The resistance value needs of resistance, 3rd resistor and the 4th resistance design determination according to actual application environment, are not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, work as the first transistor
When for p-type metal-oxide-semiconductor, the resistance value of the 4th resistance can be 0.
The above is only the specific structures for illustrating sampling module in power output protection circuit to adopt in the specific implementation
The specific structure of egf block is not limited to above structure provided in an embodiment of the present invention, can also be skilled person will appreciate that
Other structures are not limited thereto.
Specifically, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, such as Fig. 3 a
Shown, switch control module 2 can specifically include: second transistor M2, third transistor M3, the electricity of the 5th resistance R5 and the 6th
Hinder R6；Wherein,
The supply voltage that the source electrode of second transistor M2 is connected with power input VIN for receiving power input VIN,
Drain electrode is used for transmission the supply voltage received, grid and the first end of the 5th resistance R5 and the source electrode phase of third transistor M3
Even；
The second end of 5th resistance R5 is connected with the source electrode of second transistor M2；
The grid of third transistor M3 is connected with the first end of the 6th resistance R6, and drain electrode is connected with ground terminal GND；
The second end of 6th resistance R6 is for receiving conductivity control signal and cut-off control signal.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, as shown in Figure 3a, the
Two-transistor M2 can be P type metal oxide semiconductor field-effect tube (MOS, Metal Oxide Scmiconductor).When
So, second transistor M2 may be p-type triode, and the base stage of p-type triode is the grid of second transistor M2, p-type at this time
The current collection of the triode extremely source electrode of second transistor M2, the transmitting extremely drain electrode of second transistor M2 of p-type triode.In reality
In the application of border, the specific structure of second transistor M2 needs to design determination according to actual application environment, is not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, second transistor exists
Its grid is connected when having low level voltage signal, so as to so that power input is connected with the input terminal of sampling module,
The supply voltage of power input has been transferred to the input terminal of sampling module.In practical applications, second transistor is in its grid
Voltage difference V between pole and its source electrodegs(M2) with its threshold voltage Vth(M2) relationship between meets formula: | Vgs(M2) | > |
Vth(M2) | when be connected.Also, after second transistor conducting, the resistance value of equivalent resistance is smaller, is flowing through second transistor
Electric current it is smaller when, the pressure drop at both ends can be ignored, reduce voltage loss.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, as shown in Figure 3a, the
Three transistor M3 can be NPN triode, and the base stage of NPN triode is the grid of third transistor M3 at this time, NPN triode
The current collection extremely source electrode of third transistor M3, the transmitting extremely drain electrode of third transistor M3 of NPN triode.Certainly, third is brilliant
Body pipe M3 may be N-type metal-oxide-semiconductor.In practical applications, the specific structure of third transistor M3 is needed according to practical application ring
Determination is designed in border, is not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, third transistor exists
Its grid is connected when having the voltage signal of high level, so as to so as to form one between the second end and ground terminal of the 5th resistance
Access.In practical applications, voltage difference V of the third transistor between its grid and its source electrodegs(M3) with its threshold voltage
Vth(M3) relationship between meets formula: | Vgs(M3) | > | Vth(M3) | when be connected.Also, after third transistor conducting,
The resistance value of equivalent resistance is smaller, and when the electric current for flowing through third transistor is smaller, the pressure drop at both ends be can be ignored, drop
Low-voltage loss.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, in third transistor
When for N-type metal-oxide-semiconductor, the resistance value of the 6th resistance can be 0.In practical applications, the resistance value of the 5th resistance and the 6th resistance
Resistance value need according to actual application environment to design determination, be not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, conductivity control signal
For the voltage signal with high level, cut-off control signal is with low level voltage signal.
Further, it in order to be filtered, in the specific implementation, is protected in above-mentioned power supply output provided in an embodiment of the present invention
In protection circuit, as shown in Fig. 3 b to Fig. 3 d, switch control module 2 specifically can also include: the 7th resistance R7 and capacitor C；Wherein
7th resistance R7 is connected between the grid of second transistor M2 and the source electrode of third transistor M3；
Capacitor C is connected between the first end and its second end of the 5th resistance R5.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the electricity of the 7th resistance
Resistance value needs to design determination according to actual application environment, is not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the capacitance of capacitor
It needs to design determination according to actual application environment, be not limited thereto.
The above is only the specific structures for illustrating switch control module in power output protection circuit, are being embodied
When, the specific structure of switch control module is not limited to above structure provided in an embodiment of the present invention, can also be art technology
Other structures known to personnel, are not limited thereto.
Specifically, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, such as Fig. 3 b
To shown in Fig. 3 d, Logic control module 4 be can specifically include: with door &；Wherein,
First input end A with door is for receiving sampled voltage, and the second input terminal B with door is for receiving processing control
The cut-off control signal and conductivity control signal that module 3 is sent, the cut-off control for being used to receive with the output end F of door & are believed
It number exports to switch control module 2 with conductivity control signal.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, with door only its
When one input terminal and its second input terminal are the voltage signal with high level, output end can just be exported with high level
Voltage signal, otherwise, output end output have low level voltage signal.Sampled voltage can be converted with door by using in this way
For the voltage signal of third transistor conducting and cut-off in control switch control module, mould is controlled so as to quick control switch
The conducting and cut-off of third transistor in block reduce the response time.And it can also be shielded under the control of processing and control module
Sampled voltage.
In the specific implementation, big in sampled voltage in above-mentioned power output protection circuit provided in an embodiment of the present invention
When default overcurrent voltage, it is directed to and door, sampled voltage is the voltage signal with high level.In sampled voltage no more than pre-
If when overcurrent voltage, being directed to and door, sampled voltage being with low level voltage signal.In practical applications, with the tool of door
Body structure needs to design determination according to actual application environment, is not limited thereto.
The above is only the specific structures for illustrating Logic control module in power output protection circuit, are being embodied
When, the specific structure of Logic control module is not limited to above structure provided in an embodiment of the present invention, can also be art technology
Other structures known to personnel, are not limited thereto.
When further, in order to guarantee that power output protection circuit is transferred to open state by disconnecting, load overcurrent is to circuit
Caused by influence, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, such as Fig. 3 c institute
Show, power output protection circuit can also include: the driving control being connected between the source electrode of third transistor M3 and ground terminal GND
Molding block 7；Wherein,
Processing and control module 3 is also used to continue when the sampled voltage that judgement receives is greater than default overcurrent voltage to drive
Dynamic control module 7 sends conduction pulses driving signal, and the sampled voltage received in judgement is not more than default overcurrent voltage
When, disabling pulse driving signal is sent to drive control module 7；
Drive control module 7 is led for receiving conduction pulses driving signal and disabling pulse driving signal receiving
The source electrode and ground terminal GND of conducting third transistor M3 when logical pulse drive signal, when receiving disabling pulse driving signal
Disconnect the source electrode and ground terminal GND of third transistor M3.
In the specific implementation, it in above-mentioned power output protection circuit provided in an embodiment of the present invention, as shown in Figure 3d, drives
Dynamic control module 7 can specifically include: the 4th transistor M4 and the 8th resistance R8；Wherein,
The first end of 8th resistance R8 for receiving conduction pulses driving signal and disabling pulse driving signal, second end and
The grid of 4th transistor M4 is connected；
The source electrode of 4th transistor M4 is connected with the source electrode of third transistor M3, the drain electrode of the 4th transistor M4 and ground terminal
GND is connected.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, as shown in Figure 3d, the
Four transistor M4 can be NPN triode, and the base stage of NPN triode is the grid of the 4th transistor M4 at this time, NPN triode
The current collection extremely source electrode of the 4th transistor M4, the transmitting extremely drain electrode of the 4th transistor M4 of NPN triode.Certainly, the 4th is brilliant
Body pipe M4 may be N-type metal-oxide-semiconductor.In practical applications, the specific structure of the 4th transistor M4 is needed according to practical application ring
Determination is designed in border, is not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the 4th transistor exists
Its grid is connected when having the voltage signal of high level, so as to so as to form one between the second end and ground terminal of the 5th resistance
Access.In practical applications, voltage difference V of the 4th transistor between its grid and its source electrodegs(M4) with its threshold voltage
Vth(M4) relationship between meets formula: | Vgs(M4) | > | Vth(M4) | when be connected.Also, after the 4th transistor turns,
The resistance value of equivalent resistance is smaller, and when the electric current for flowing through the 4th transistor is smaller, the pressure drop at both ends be can be ignored, drop
Low-voltage loss.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, conduction pulses driving
Signal is the voltage signal with high level, and disabling pulse driving signal is and arteries and veins to be connected with low level voltage signal
Driving signal and disabling pulse driving signal are rushed using PWM (Pulse Width Modulation, the modulation of control pulse width)
Technology is controlled.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the electricity of the 8th resistance
Resistance value needs to design determination according to actual application environment, is not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, when the 4th transistor
When M4 is N-type metal-oxide-semiconductor, the resistance value of the 8th resistance can be 0.
Specifically, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, such as Fig. 3 a
Into Fig. 3 d, it may include: microcontroller that processing and control module 3, which has,；Wherein,
The receiving port AI of microcontroller is for receiving sampled voltage, and the first output port IO1 is for exporting conducting control
Signal processed and cut-off control signal.The sampled voltage that can be exported in this way by microcontroller real-time detection sampling module, and
When control switch control module.
Further, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, such as scheme
Shown in 3c and Fig. 3 d, when power output protection circuit further includes drive control module 7, microcontroller further include: for defeated
The second output terminal mouth IO2 of disabling pulse driving signal and conduction pulses driving signal out.
Further, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, such as scheme
Shown in 3b to Fig. 3 d, when power output protection circuit further includes state indicator module 6, microcontroller further include: for defeated
The third output port IO3 of alarm control signal out.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the tool of microcontroller
Body structure is same as the prior art, it will be apparent to an ordinarily skilled person in the art that having, it is not described here in detail, does not also answer
As limitation of the present invention.
The above is only the specific structures for illustrating processing and control module in power output protection circuit, are being embodied
When, the specific structure of processing and control module is not limited to above structure provided in an embodiment of the present invention, can also be art technology
Other structures known to personnel, are not limited thereto.
Specifically, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, such as Fig. 3 b
To shown in Fig. 3 d, surge suppression modules 5 be can specifically include: transient voltage suppressor TVS；Wherein,
The cathode of transient voltage suppressor TVS is the input terminal 5a of surge suppression modules 5, and transient voltage inhibits two poles
The anode of pipe TVS is connected with ground terminal GND.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, transient voltage inhibits
Diode can be unidirectional transient voltage suppressor, alternatively, transient voltage suppressor may be two-way transient electrical
Constrain diode processed.The concrete type needs of transient voltage suppressor design determination according to actual application environment, herein
It is not construed as limiting.
The above is only the specific structures for illustrating surge suppression modules in power output protection circuit, are being embodied
When, the specific structure of surge suppression modules is not limited to above structure provided in an embodiment of the present invention, can also be art technology
Other structures known to personnel, are not limited thereto.
Specifically, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, such as Fig. 3 b
To shown in Fig. 3 d, state indicator module 6 be can specifically include: the 9th resistance R9 and light emitting diode L；Wherein,
For receiving alarm control signal, second end is connected the first end of 9th resistance R9 with the anode of light emitting diode L,
The cathode of light emitting diode L is connected with ground terminal GND.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, state indicator module
When receiving alarm control signal, light emitting diode is in quick flashing state.Certainly, it is disconnected in power input and power output end
Not to when power supply, the microcontroller control light emitting diode in processing and control module is in close state.Power input with
Microcontroller control luminous two when power output end is connected and is in the normal condition to power to the load, in processing and control module
Pole pipe is in and is always on state.Microcontroller control luminous two in load cut-off or not connected load, in processing and control module
Pole pipe is in slow flash state.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, the electricity of the 9th resistance
Resistance value needs to design determination according to actual application environment, is not limited thereto.
In the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, state indicator module
It can also be including buzzer etc. with the element of alarm prompt function.
The above is only the specific structures for illustrating state indicator module in power output protection circuit, are being embodied
When, the specific structure of state indicator module is not limited to above structure provided in an embodiment of the present invention, can also be art technology
Other structures known to personnel, are not limited thereto.
Further, in the specific implementation, in above-mentioned power output protection circuit provided in an embodiment of the present invention, such as scheme
Shown in 3c and Fig. 3 d, power output protection circuit can also include: posive temperature coefficient thermistor PTC；Wherein,
Switch control module 2 transmits the power supply received electricity to sampling module 1 by posive temperature coefficient thermistor PTC
Pressure.
Below shown in Fig. 3 a and Fig. 3 d for specific structure to the work of power output protection circuit provided by the invention
It is illustrated as process.Wherein, the supply voltage of power input VIN is Vin, preset overcurrent voltage V0Meet formula:
Embodiment one,
As shown in Figure 3a, the first transistor is PNP triode, and second transistor is p-type metal-oxide-semiconductor, third transistor NPN
Triode.
(1) when the load of power output end VOUT connection works normally not short-circuit, i.e. power input VIN and power supply are defeated
When outlet VOUT is connected, diode D has stable conduction voltage drop, to make the V of the first transistor M1gs(M1)>Vth(M1) and
Conducting can be ignored since the equivalent resistance of the first transistor M1 after conducting is smaller.Therefore first resistor R1 is short
Road, source electrode, second resistance R2, the 3rd resistor R3 of the first transistor M1 form access, so that the second end of second resistance R2
Voltage V1I.e. sampled voltage meets formula:Wherein, U1For the voltage of the anode of diode D at this time, r2It is
The resistance value of two resistance R2, r3For the resistance value of 3rd resistor R3.Required electric current is smaller when being worked normally due to load,
The pressure drop of second transistor M2 can be ignored, and make U1≈Vin.ThereforeTo meet formula: V1>V0, micro-
Controller MCU persistently exports conductivity control signal to third transistor M3, to control third transistor M3 constant conduction, makes second
The grid and ground terminal GND constant conduction of transistor M2, so that the anode for controlling power input VIN and diode D is persistently led
It is logical, to transmit supply voltage V to the anode of diode Din。
(2) in the load cut-off of the not connected load of power output end VOUT or connection, i.e. power input VIN and power supply
When output end VOUT is disconnected, diode D is not turned on, so that its both ends does not have conduction voltage drop, therefore the first transistor M1 ends,
First resistor R1, second resistance R2,3rd resistor R3 form access, so that the voltage V of the second end of second resistance R22Sample
Voltage meets formula:Wherein, U2For the voltage of the anode of diode D at this time, r1For first resistor R1's
Resistance value.The voltage U of diode D anode at this time2≈Vin.ThereforeTo meet formula: V2>V0, micro-
Controller MCU exports conductivity control signal to third transistor M3, to control third transistor M3 conducting, makes second transistor M2
Grid be connected with ground terminal GND, so that the anode for controlling power input VIN and diode D is connected.
(3) in the load short circuits of power output end VOUT connection, i.e. the cathode of diode D is directly grounded, to make two
The voltage of the anode of pole pipe D is the conduction voltage drop of diode, and since the cathode of diode D is grounded, the first transistor M1 is cut
Only, first resistor R1, second resistance R2,3rd resistor R3 form access, so that the voltage V of the second end of second resistance R23I.e.
Sampled voltage meets formula:To meet formula: V3=V0, microcontroller is to third transistor
M3 output cut-off control signal disconnects the grid and ground terminal GND of second transistor M2 to control third transistor M3 cut-off,
It disconnects, makes between power input VIN and power output end VOUT to control the anode of power input VIN and diode D
Overcurrent protection is realized in open circuit.
Embodiment two,
As shown in Figure 3d, the first transistor is PNP triode, and second transistor is p-type metal-oxide-semiconductor, third transistor NPN
Triode.
(1) when the load of power output end VOUT connection works normally not short-circuit, i.e. power input VIN and power supply are defeated
When outlet VOUT is connected, diode D has stable conduction voltage drop, to make the V of the first transistor M1gs(M1)>Vth(M1) and
Conducting can be ignored since the equivalent resistance of the first transistor M1 after conducting is smaller.Therefore first resistor R1 is short
Road, source electrode, second resistance R2, the 3rd resistor R3 of the first transistor M1 form access, so that the second end of second resistance R2
Voltage V1I.e. sampled voltage meets formula:Wherein, U1For the voltage of the anode of diode D at this time, r2It is
The resistance value of two resistance R2, r3For the resistance value of 3rd resistor R3.Required electric current is smaller when being worked normally due to load,
The pressure drop of second transistor M2 can be ignored, and make U1≈Vin.ThereforeTo meet formula: V1>V0, micro-
Controller MCU continues to the conductivity control signal with high level is sent with the first input end A of door &, due to second with door &
Input terminal B has the voltage signal of high level, therefore has the voltage signal of high level with the output end F of door & output, thus will
The conductivity control signal for the high level that its first input end A is received is transferred to third transistor M3, to control third transistor
M3 constant conduction, the grid and ground terminal GND of second transistor M2 is connected, to control power input VIN and diode D
Positive constant conduction.And the light emitting diode L in microcontroller state of a control indicating module 6 be in be always on state with
It is prompted.
(2) in the load cut-off of the not connected load of power output end VOUT or connection, i.e. power input VIN and power supply
When output end VOUT is disconnected, diode D is not turned on, so that its both ends does not have conduction voltage drop, therefore the first transistor M1 ends,
First resistor R1, second resistance R2,3rd resistor R3 form access, so that the voltage V of the second end of second resistance R22Sample
The voltage of voltage meets formula:Wherein, U2For the voltage of the anode of diode D at this time, r1It is first
The resistance value of resistance R1.The voltage U of diode D anode at this time2≈Vin.ThereforeTo meet formula:
V2>V0, microcontroller is to the conductivity control signal with high level is sent with the first input end A of door &, due to door &'s
Second input terminal B has the voltage signal of high level, therefore has the voltage signal of high level with the output end F of door & output, from
And the conductivity control signal of its first input end A high level received is transferred to third transistor M3, to control third crystalline substance
Body pipe M3 conducting, is connected the grid and ground terminal GND of second transistor M2, to control power input VIN's and diode D
Anode conducting.And the light emitting diode L in microcontroller control instructions module 6 is in slow flash state to carry out alarm and mention
Show.
(3) in the load short circuits of power output end VOUT connection, i.e. the cathode of diode D is directly grounded, to make two
The voltage of the anode of pole pipe D is the conduction voltage drop of diode, and since the cathode of diode D is grounded, the first transistor M1 is cut
Only, first resistor R1, second resistance R2,3rd resistor R3 form access, so that the voltage V of the second end of second resistance R23I.e.
The voltage of sampled voltage meets formula:To meet formula: V3=V0, so that defeated with the second of door &
Enter to hold the voltage signal of B input low level, therefore can quickly export with the output end F of door & with low level voltage signal,
So as to control third transistor M3 cut-off in time.Wherein, since microcontroller is judging V3No more than V0When, Cai Huixiang
Low level cut-off is sent with the first input end A of door & and controls signal, so that the output end F with door & is exported with low level
Voltage signal.Therefore since microcontroller has to the processing deterministic process of sampled voltage, as long as and with door & its first
When input terminal A or its second input terminal B receive low level voltage signal, low-voltage will be exported by output end F immediately
Voltage signal, with control third transistor M3 cut-off, therefore, can make the grid of second transistor M2 using with door and connect
Ground terminal GND is quickly disconnected, and is disconnected so as to quickly control the anode of power input VIN and diode D, is made power input
Open circuit between VIN and power output end VOUT is held, timely to realize overcurrent protection.And microcontroller is to state instruction
Module 6 sends alarm control signal, and after receiving alarm control signal, control light emitting diode L is in state indicator module 6
Quick flashing state is to carry out warning note.And due to the effect of transient voltage suppressor TVS, can further prevent loading
Influence of the abnormal caused abnormal voltage to power output protection circuit.And due to the effect of posive temperature coefficient thermistor,
Lead to influence of the overcurrent to power input when may further ensure that load short circuits.
(4) when power input VIN and power output end VOUT become open state from disconnecting, microcontroller to
Sending with the first input end A of door &, there is low level cut-off to control signal, therefore have low electricity with the output end F of door & output
Flat voltage signal, so that the low level cut-off control signal that its first input end A is received is transferred to third transistor
M3, to control third transistor M3 cut-off.Microcontroller drives letter to the conduction pulses of the 4th transistor M4 output high level
Number with control the 4th transistor M4 conducting, the grid of second transistor M2 is connected with ground terminal GND, to control power input
The anode of VIN and diode D is held to be connected.In load short circuits, the voltage of the anode of diode D is the conduction voltage drop of diode,
So that the voltage V of the second end of second resistance R23That is the voltage of sampled voltage meets formula:Meet
Formula: V3=V0.Microcontroller exports low level disabling pulse driving signal to the 4th transistor M4 to control the 4th crystalline substance
Body pipe M4 cut-off disconnects the grid of second transistor M2 and ground terminal GND, to control power input VIN and diode D
Anode disconnect, realize overcurrent protection.Otherwise, microcontroller uses the duty of PWM technical controlling conduction pulses driving signal
It is full duty ratio in the duty ratio of conduction pulses driving signal than being full duty ratio to control the 4th transistor M4 constant conduction
Afterwards, microcontroller is to sending the conductivity control signal with high level with the first input end A of door &, due to the with door &
Two input terminal B have the voltage signal of high level, therefore have the voltage signal of high level with the output end F of door & output, thus
The conductivity control signal of its first input end A high level received is transferred to third transistor M3, to control third crystal
Pipe M3 conducting, is connected the grid of second transistor M2 with ground terminal GND, to control power input VIN's and diode D
Anode conducting.After stablizing output with door &, microcontroller exports low level disabling pulse driving to the 4th transistor M4
Signal disconnects the grid of second transistor M2 and ground terminal GND, so that it is defeated to control power supply to control the 4th transistor M4 cut-off
Enter to hold the anode of VIN and diode D to disconnect, to realize overcurrent protection with door & collective effect by Micro-processor MCV.?
When load short circuits, the voltage of the anode of diode D is the conduction voltage drop of diode, so that the voltage of the second end of second resistance R2
V3That is the voltage of sampled voltage meets formula:Meet formula: V3=V0.So that with door &'s
The voltage signal of second input terminal B input low level, therefore can quickly export with the output end F of door & with low level electricity
Signal is pressed, so as to control third transistor M3 cut-off in time.Wherein, since microcontroller is judging V3No more than V0
When, just the first input end A of meeting Xiang Yumen sends low level cut-off and controls signal, so that the output end F with door exports tool
There is low level voltage signal.Therefore since microcontroller has the processing deterministic process to sampled voltage, and only with door &
Output end F will be passed through immediately when its first input end A or its second input terminal B receive low level voltage signal
The voltage signal of low-voltage is exported, to control third transistor M3 cut-off, therefore, second transistor M2 can be made using with door
Grid quickly disconnected with ground terminal GND, disconnected so as to quickly control the anode of power input VIN and diode D,
Make open circuit between power input VIN and power output end VOUT, timely to realize overcurrent protection.
Based on the same inventive concept, the embodiment of the invention also provides a kind of power supply output protecting devices, including the present invention
Any of the above-described kind of power output protection circuit that embodiment provides.The principle that the power supply output protecting device solves the problems, such as with it is aforementioned
Power output protection circuit is similar, therefore the implementation of the power supply output protecting device may refer to aforementioned power source output protection circuit
Implementation, repeat place details are not described herein.The power supply output protecting device can have power supply defeated for warning device etc. is any
The products or components of function out.Other essential component parts for the power supply output protecting device are this field
Those of ordinary skill should be understood that have, and this will not be repeated here, also should not be taken as limiting the invention.
Power output protection circuit and device provided in an embodiment of the present invention, comprising: sampling module, switch control module with
And processing and control module；Wherein, received supply voltage is converted to by sampled voltage by sampling module in proportion, then is led to
It crosses the sampled voltage that receives of processing and control module judgement and whether is greater than default overcurrent voltage, and judging that sampled voltage is not more than
The load short circuits or overcurrent of power output end connection can be confirmed when default overcurrent voltage, and send and end to switch control module
Signal is controlled, control switch control module stops transmitting received supply voltage to sampling module, so that it is defeated to disconnect power supply
Enter the damage for the power supply that end and sampling module connect power input to avoid load short circuits or overcurrent, realizes that overcurrent is protected
Shield.When processing and control module judges that sampled voltage is greater than default overcurrent voltage, conducting control letter is sent to switch control module
Number, control switch control module constant conduction is with to the received supply voltage of sampling module continuous transmission, then passes through sampling
Module is transferred to power output end after dividing to received supply voltage, to power to the load.Therefore, by above-mentioned
The mutual cooperation of three modules, can be to avoid asking to the power supply damage of power input connection when load short circuits or overcurrent
Topic, to keep circuit more reliable and more stable.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (13)
1. a kind of power output protection circuit characterized by comprising sampling module, switch control module and processing control
Module；Wherein,
The sampling module, for receiving the supply voltage of the switch control module transmission, and to the electricity received
Source voltage is transferred to power output end after being divided, and the supply voltage received is converted to sampling electricity in proportion
The processing and control module is transferred to after pressure；The sampling module includes: diode, the first transistor, first resistor, the second electricity
Resistance, 3rd resistor and the 4th resistance；Wherein, the anode of the diode is used to receive the electricity of the switch control module transmission
Source voltage, cathode are connected for the supply voltage after partial pressure to be transferred to the power output end with the power output end；Institute
The source electrode of the first end and the first transistor of stating first resistor is connected with the anode of the diode, first electricity
The drain electrode of the second end of resistance and the first transistor is connected with the first end of the second resistance；The second resistance
Second end is connected with the first end of the 3rd resistor, and the second end of the second resistance is for exporting the sampling electricity
Pressure；The second end of the 3rd resistor is connected with ground terminal；The first end and the cathode phase of the diode of 4th resistance
Even, second end is connected with the grid of the first transistor；Default overcurrent voltage V0Meet formula:Its
In, UDRepresent the conduction voltage drop of the diode, r1Represent the resistance value of the first resistor, r2Represent the second resistance
Resistance value, r3Represent the resistance value of the 3rd resistor；
The processing and control module is not more than for receiving the sampled voltage, and in the sampled voltage that judgement receives
When default overcurrent voltage, Xiang Suoshu switch control module sends cut-off control signal, in the sampled voltage that judgement receives
When greater than default overcurrent voltage, continue to send conductivity control signal to the switch control module；
The switch control module, for receiving the supply voltage of power input, the conductivity control signal and described section
Signal is only controlled, and transmits the switch control module to the sampling module when receiving the conductivity control signal and receives
The supply voltage arrived stops transmitting the switch control to the sampling module when receiving the cut-off control signal
The supply voltage that module receives.
2. power output protection circuit as described in claim 1, which is characterized in that the power output protection circuit also wraps
It includes: Logic control module；The processing and control module is sent to the switch control module by the Logic control module and is cut
Only control signal and the conductivity control signal；
The cut-off control that the Logic control module is used to receive the sampled voltage and the processing and control module is sent
Signal, and the cut-off received control signal is transferred to the switch control module, and for receiving the sampling
The conductivity control signal that voltage and the processing and control module are sent, and the conductivity control signal received is transmitted
To the switch control module.
3. power output protection circuit as claimed in claim 2, which is characterized in that the Logic control module includes: and door；
Wherein,
The first input end with door is used to receive described for receiving the sampled voltage, second input terminal with door
The cut-off control signal and the conductivity control signal that processing and control module is sent, the output end with door are used to connect
The cut-off control signal received and the conductivity control signal are exported to the switch control module.
4. power output protection circuit as described in claim 1, which is characterized in that the switch control module includes: second
Transistor, third transistor, the 5th resistance and the 6th resistance；Wherein,
The supply voltage that the source electrode of the second transistor is connected with the power input for receiving the power input,
Drain electrode is used for transmission the supply voltage received, the first end and the third transistor of grid and the 5th resistance
Source electrode be connected；
The second end of 5th resistance is connected with the source electrode of the second transistor；
The grid of the third transistor is connected with the first end of the 6th resistance, and drain electrode is connected with ground terminal；
The second end of 6th resistance controls signal for receiving the conductivity control signal and the cut-off.
5. power output protection circuit as claimed in claim 4, which is characterized in that the switch control module further include: the
Seven resistance and capacitor；Wherein
7th resistance is connected between the grid of the second transistor and the source electrode of the third transistor；
The capacitance connection is between the first end and its second end of the 5th resistance.
6. power output protection circuit as claimed in claim 4, which is characterized in that the power output protection circuit also wraps
It includes: being connected to drive control module between the source electrode of the third transistor and the ground terminal；Wherein,
The processing and control module is also used to when the sampled voltage that receives of judgement is greater than default overcurrent voltage, continue to
The drive control module sends conduction pulses driving signal, and in the sampled voltage for judging to receive no more than default
When overcurrent voltage, Xiang Suoshu drive control module sends disabling pulse driving signal；
The drive control module is connecing for receiving the conduction pulses driving signal and the disabling pulse driving signal
The source electrode and the ground terminal that the third transistor is connected when receiving the conduction pulses driving signal are receiving described cut
The source electrode and the ground terminal of the third transistor are only disconnected when pulse drive signal.
7. power output protection circuit as claimed in claim 6, which is characterized in that the drive control module includes: the 4th
Transistor and the 8th resistance；Wherein,
The first end of 8th resistance is used to receive the conduction pulses driving signal and the disabling pulse driving signal, the
Two ends are connected with the grid of the 4th transistor；
The source electrode of 4th transistor is connected with the source electrode of the third transistor, the drain electrode of the 4th transistor with it is described
Ground terminal is connected.
8. power output protection circuit as described in claim 1, which is characterized in that the power output protection circuit also wraps
It includes: surge suppression modules；Wherein, the input terminal of the surge suppression modules is connected with the power output end；The surge suppression
Molding block is used to prevent the surge voltage of the power output end from inputting the sampling module；And/or
The power output protection circuit further include: state indicator module；Wherein, the processing and control module is also used to judging
When the sampled voltage received is not more than default overcurrent voltage, Xiang Suoshu state indicator module sends alarm control signal；
The state indicator module is used for the alert after receiving the alarm control signal.
9. power output protection circuit as claimed in claim 8, which is characterized in that also wrapped in the power output protection circuit
When including surge suppression modules, the surge suppression modules include: transient voltage suppressor；Wherein, the transient electrical is constrained
The cathode of diode processed is the input terminal of the surge suppression modules, the anode and ground terminal of the transient voltage suppressor
It is connected；
When the power output protection circuit further includes state indicator module, the state indicator module includes: the 9th resistance
And light emitting diode；Wherein, the first end of the 9th resistance is for receiving the alarm control signal, second end and the hair
The anode of optical diode is connected, and the cathode of the light emitting diode is connected with the ground terminal.
10. such as the described in any item power output protection circuits of claim 1-9, which is characterized in that the processing and control module
It include: microcontroller；Wherein,
The receiving port of the microcontroller is for receiving the sampled voltage, and the first output port is for exporting the conducting control
Signal processed and the cut-off control signal.
11. power output protection circuit as claimed in claim 10, which is characterized in that the power output protection circuit also
When including drive control module, the microcontroller further include: driven for exporting disabling pulse driving signal and conduction pulses
The second output terminal mouth of signal；
When the power output protection circuit further includes state indicator module, the microcontroller further include: for exporting report
The third output port of alert control signal.
12. such as the described in any item power output protection circuits of claim 1-7, which is characterized in that the power supply output protection
Circuit further include: posive temperature coefficient thermistor；Wherein, the switch control module passes through the posive temperature coefficient thermistor
The supply voltage received is transmitted to the sampling module.
13. a kind of power supply output protecting device, which is characterized in that including the described in any item power supply outputs of such as claim 1-12
Protect circuit.
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| CN108429239A (en) * | 2018-04-24 | 2018-08-21 | 广州金升阳科技有限公司 | A kind of output overvoltage protection circuit and the power supply comprising the circuit |
| CN109240154A (en) * | 2018-09-03 | 2019-01-18 | 中车大连电力牵引研发中心有限公司 | Output-controlling device and vehicle low voltage control system |
| CN110275058A (en) * | 2019-06-20 | 2019-09-24 | 华立科技股份有限公司 | The communication module overload identification protection circuit and method of intelligent electric energy meter |
| CN111337735B (en) * | 2020-02-17 | 2022-09-13 | 上海艾为电子技术股份有限公司 | Chip and current sampling circuit |
| CN113497486B (en) * | 2020-03-20 | 2024-01-30 | 华为技术有限公司 | Power supply combining circuit, diagnosis method, device and system |
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| CN115799001A (en) * | 2022-11-09 | 2023-03-14 | 东方博沃（北京）科技有限公司 | Relay driving device |
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| CN106848998A (en) | 2017-06-13 |
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