CN104810781B - A kind of protective switch circuit and load protector - Google Patents
A kind of protective switch circuit and load protector Download PDFInfo
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- CN104810781B CN104810781B CN201510198330.0A CN201510198330A CN104810781B CN 104810781 B CN104810781 B CN 104810781B CN 201510198330 A CN201510198330 A CN 201510198330A CN 104810781 B CN104810781 B CN 104810781B
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Abstract
The present invention provides a kind of protective switch circuit and load protector, field is protected applied to the output loading based on fault detection, the present invention come power failure condition in detection system and exports a power failure signal by power detection module, suitable for various power detecting situations, it ensure that the comprehensive and safety of power detecting, power failure signal conversion is generated into an enable signal to drive protective switch circuit via switch module again, the enable signal is for quickly blocking the connection of output loading, to find failure and effectively disconnection loaded work piece route in time when breaking down, patient may be damaged with achieving the purpose that protection power source and being supported on power failure operation.
Description
Technical field
The present invention relates to power protection fields, more particularly to a kind of protective switch circuit and load protector.
Background technique
Requirement with people to medical technique level is higher and higher, traditional surgical operation is smaller to wound, bleeding more
Few direction is developed, and the update of Medical Devices technology is promoted.Such as Digital Subtraction and intervention operation, hysteroscope technology and hysteroscope hand
Art, ultrasonic technique and ultrasound knife etc..Especially ultrasound knife technology can make operation more accurate, more clear without the visual field in eschar generation, art
The advantages that clear, is widely used in surgical operation.
Also just in this way, make ultrasound knife technical application occasion determine its to energy output safety have high requirements,
Because the output of energy that ultrasound knife technology is relied on be with energy-rich radiation output, if when system breaks down cannot and
When shutdown output, it would be possible that patient can be caused accidentally injure do harm to.And in existing power faiture safe, there is event in system power supply
When barrier for control energy output control signal can not timely and effectively turn off, and there is also response speed it is unhappy and ring
Answer not sensitive enough situation.
So wish can be in ultrasound knife system power failure by designing one kind by those skilled in the art of the present technique
When, rapidly switch off in time output loading and and make police instruction, to effectively raise the safety of ultrasound knife system, with
System failure output is reduced to the full extent to the accidental injury evil of patient.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of protective switch circuit and loads
Protective device is effectively to turn off in time for solving the problems, such as output loading in the prior art in failure.
In order to achieve the above objects and other related objects, the present invention the following technical schemes are provided:
Scheme one
A kind of protective switch circuit, input terminal and output end including normally closed connection and for receiving making for enable signal
Energy end, the enable end receive enable signal and simultaneously drive the input terminal of normally closed connection and output end to disconnect according to it.
As the preferred embodiment of above-mentioned protective switch circuit, the protective switch circuit includes resistance R11, resistance R12, two
The drain electrode of pole pipe D11, diode D12 and metal-oxide-semiconductor Q11 and power supply V0, the metal-oxide-semiconductor Q11 are as the protective switch circuit
Input terminal, output end of the source electrode of the metal-oxide-semiconductor Q11 as the protective switch circuit, the grid of the metal-oxide-semiconductor Q11 is logical
Cross the resistance R11 connection power supply V0, the anode of the diode D11 connects the grid of the metal-oxide-semiconductor Q11, and described two
The anode of enable end of the cathode of pole pipe D11 as the protective switch circuit, the diode D12 passes through the resistance R12
The source electrode of the metal-oxide-semiconductor Q11 is connected, the cathode of the diode D12 connects the enable end of the protective switch circuit.
Scheme two
On the basis of above scheme one, the present invention also provides a kind of load protectors, comprising: power detection module,
For obtaining the voltage value of power supply to be detected and being compared it with predetermined reference voltage value, and in the power supply to be detected
Voltage value Amplitude of Hypotensive generates a power failure signal when being more than the predetermined reference voltage value, and is exported；Switch module,
The power detection module is connected, for receiving the power failure signal and generating an enable signal according to it, and is exported；
Protective switch circuit module, the input terminal and output end including normally closed connection and the enable end for connecing the switch module, institute
It states enable end and connects the switch module to receive the enable signal and drive input terminal and the output of normally closed connection according to it
End disconnects.
As the preferred embodiment of above-mentioned load protector, the power detection module is one for detecting the electricity to be detected
Source is positive, the first power supply comparing unit of negative power signal, the first power supply comparing unit include resistance R51, resistance R52,
Resistance R53, resistance R54, resistance R55, resistance R56, pull-up resistor R57, capacitor C51, voltage-stabiliser tube D51, predetermined reference voltage letter
Number and the inverting input terminal of amplifier U51 and amplifier U52, the amplifier U51 connect predetermined reference voltage signal, it is described
The non-inverting input terminal of amplifier U51 connects the positive power signal in the power supply to be detected by resistance R51, and passes through capacitor
C51 ground connection, the resistance R53 are connected in parallel in the both ends of the capacitor C51, and the inverting input terminal of the amplifier U52 passes through
Resistance R52 connection predetermined reference voltage signal, and the negative power signal in the power supply to be detected, institute are connected by resistance R54
The cathode for stating voltage-stabiliser tube D51 connects the inverting input terminal of the amplifier U52, and the plus earth of the voltage-stabiliser tube D51 is described to put
The non-inverting input terminal of big device U52 connects the non-inverting input terminal of the amplifier U51 by resistance R55, and is connect by resistance R56
The output end of ground, the amplifier U51 and amplifier U52 connect the pull-up resistor R57 and jointly as the power detectings
The output end of module.
As the preferred embodiment of above-mentioned load protector, the power detection module is one for detecting the electricity to be detected
Source is the second source comparing unit of positive power signal, and the second source comparing unit includes resistance R59, resistance R510, electricity
The inverting input terminal for holding C52 and comparator U53, the comparator U53 connects predetermined reference voltage signal, the comparator U53
Non-inverting input terminal by the resistance R59 connection positive power signal to be detected, it is described and by capacitor C52 ground connection
Resistance R510 is connected in parallel in the both ends of the capacitor C52, and the output end of the capacitor C52 is more single as the second source
The output end of member simultaneously connects the pull-up resistor R57.
As advanced optimizing for above two preferred embodiment, the switch module includes metal-oxide-semiconductor Q41, resistance R41 and electricity
Input terminal of the grid of source V5, the metal-oxide-semiconductor Q41 as the input terminal connection power detection module of switch module, the metal-oxide-semiconductor
Q41 drain electrode as switch module output end and the power supply V5 is connected to by the resistance R41, the metal-oxide-semiconductor Q41's
Source electrode ground connection.
As the above-mentioned one-step optimization again advanced optimized, the protective switch circuit module includes resistance R11, resistance
R12, diode D11, diode D12 and metal-oxide-semiconductor Q11 and power supply, the drain electrode of the metal-oxide-semiconductor Q11 is as the protective switch
The input terminal of circuit, output end of the source electrode of the metal-oxide-semiconductor Q11 as the protective switch circuit, the grid of the metal-oxide-semiconductor Q11
By the resistance R11 connection power supply, the anode of the diode D11 connects the grid of the metal-oxide-semiconductor Q11, described for pole
The anode of enable end of the cathode of diode D11 as the protective switch circuit, the diode D12 passes through the resistance
R12 connects the source electrode of the metal-oxide-semiconductor Q11, and the cathode of the diode D12 connects the enable end of the protective switch circuit.
Shown in sum up, the present invention is at least had the advantages that by the present invention in that energy signal carrys out fast driving protection
Switching circuit makes disconnection protection act, and provides abundant and selectable power detection module simultaneously, various to be suitable for
Power detecting situation ensure that the comprehensive and safety of power detecting, still further provides various early warning protections, event is occurring
Failure can be found when barrier in time and effectively disconnects loaded work piece route, achievees the purpose that while protecting system and patient.Institute
With the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value
Detailed description of the invention
Fig. 1 is a kind of embodiment schematic diagram of protective switch circuit provided by the invention.
Fig. 2 is a kind of specific implementation circuit diagram of protective switch circuit described in Fig. 1.
Fig. 3 is a kind of embodiment schematic diagram of load protector provided by the invention.
Fig. 4 is a kind of specific implementation circuit diagram of power detection module in a kind of load protector provided by the invention.
Fig. 5 is a kind of implementing circuit figure of the first power supply comparing unit in power detection module.
Fig. 6 is a kind of implementing circuit figure of second source comparing unit in power detection module.
Fig. 7 is a kind of implementing circuit figure of power detection module.
Fig. 8 is a kind of embodiment circuit diagram of switch module.
Fig. 9 switch module and protective switch circuit are cooperated the circuit connection diagram to realize load protection.
Figure 10 is the another embodiment circuit diagram of switch module.
Figure 11 is a kind of application principle figure of load protector provided by the invention in practice.
Drawing reference numeral explanation
10 protective switch circuits
20 pwm signal output ends
30 loads
40 switch modules
50 power detection modules
51 first power supply comparing units
511 reference voltage generation units
52 second source comparing units
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in schema then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
Embodiment 1
The present invention provides a kind of protective switch circuits 10 to show the implementation of the protective switch circuit 10 referring to Fig. 1
Mode schematic diagram, as shown, the setting of protective switch circuit 10, between pwm signal output end and load 30, protective switch is electric
Input terminal and output end of the road 10 including normally closed connection and the enable end for receiving enable signal, protective switch circuit 10
Input terminal connects pwm signal output end 20, and output end connection load 30, the enable end of protective switch circuit 10 can believe for receiving
Number E simultaneously drives the input terminal of normally closed connection and output end to disconnect according to it, blocks pwm signal output end 20 and negative with this
Carry the connection between 30.Enable signal can be generated when monitoring failure by protective switch circuit 10 or by Conversion fault
It rapidly disconnects, comes when driving the input terminal and output end of the normally closed connection in protective switch circuit 10 at enable signal
Achieve the purpose that make load 30 to stop working and avoid load 30 to work on the possible unexpected injury of institute.
Specifically, in conjunction with Fig. 2, a kind of specific implementation circuit diagram of protective switch circuit 10 is given, as shown in Fig. 2, protecting
Shield switching circuit 10 is at least made of resistance R11, resistance R12, diode D11, diode D12 and transistor, wherein this
Transistor selects N-type metal-oxide-semiconductor Q11 in embodiment, and the drain electrode of N-type metal-oxide-semiconductor Q11 connects pwm signal output end 20, N-type metal-oxide-semiconductor
The source electrode connection load 30 of Q11, (specific voltage value can be according to tool by resistance R11 connection power supply V0 for the grid of N-type metal-oxide-semiconductor Q11
Depending on body performance), the grid of the anode connection N-type metal-oxide-semiconductor Q11 of diode D11, the cathode of diode D11 is as protection
The enable end of switching circuit 10 simultaneously passes through resistance R12 connection N-type metal-oxide-semiconductor Q11 for the anode of connection enable signal E, diode D12
Source electrode, the cathode of diode D12 is connected to enable end.The working principle of protective switch circuit 10 are as follows: in supply voltage V0 (example
Such as 15V) under the action of (be equivalent to N-type metal-oxide-semiconductor Q11 grid keep high level), between the drain electrode and source electrode of N-type metal-oxide-semiconductor Q11
Conducting can guarantee to make in normally closed connection status when enable end receives between pwm signal output end 20 and load 30 in this way
When energy signal E (low level), enable signal E here is that low level is effective, and the grid of N-type metal-oxide-semiconductor Q11 becomes low level, that
It is blocked between the drain electrode and source electrode of N-type metal-oxide-semiconductor Q11, that is to say and keep blocking between pwm signal output end 20 and load 30
State；But in view of the output of pwm signal output end 20 is pwm signal, if energy signal E intervention is just height in pwm signal
Intervention when level persistently exports, even when the moment that enable signal E blocks the drain electrode of N-type metal-oxide-semiconductor Q11 and source electrode, load
There are also of short duration output high level outputs at 30 ends, so that the purpose for blocking 30 work of load can not be rapidly reached in time, therefore
It is allowing the source electrode (that is to say and loading 30 ends) of N-type metal-oxide-semiconductor Q11 to connect with for the enable end for accessing enable signal E, thus may be used
Can drag down the voltage at 30 ends of load immediately in enable signal E intervention and load 30 allowed to stop working immediately.In this implementation
In example, it is further ensured that load 30 can by being sequentially connected in series resistance R12 and diode D12 between load 30 and enable end
Be stabilized in the voltage level of enable signal E, to avoid be blocked device due to other electric signals to load 30 bring it is secondary
It influences, to improve the stability of circuit.
It should be noted that the diode D11 and diode D12 also preferably use pressure stabilizing two in above-described embodiment 1
Pole pipe, but it is preferred that the selection of accessory will not influence understanding and reality of the those skilled in the art for above-mentioned technical proposal
It applies, therefore hereafter repeats no more to the preferred of accessory.
Embodiment 2
On the basis of above-described embodiment 1, the present embodiment additionally provides a kind of load protection circuit device, negative for protecting
Work can be blocked when system power supply breaks down in time by carrying 30, to reach the mesh of protection system safety operation and patient
's.Fig. 3 is referred to, a kind of embodiment schematic diagram of load protection circuit device provided by the invention, the load are given
Circuit device is protected to be arranged between pwm signal output end 20 and output loading 30, it is whether extremely next quick for monitoring power supply
And the connection between pwm signal output end 20 and output loading 30 is effectively cut off, as shown in figure 3, the load protection
Circuit device includes at least 10 module of power detection module 50, switch module 40 and protective switch circuit, wherein power detecting
Module 50, switch module 40 and protective switch circuit are sequentially connected, and power detection module 50 is used to obtain the electricity of power supply to be detected
It is simultaneously compared by pressure value with predetermined reference voltage value, and is more than described pre- in the voltage step-down amplitude of the power supply to be detected
If generating a power failure signal when reference voltage value and being exported, switch module 40 connects the power detection module 50,
For receiving the power failure signal and generating an enable signal according to it, 10 module of protective switch circuit includes normally closed connection
Input terminal and output end and for connecing the enable end of the switch module 40, the enable end connect the switch module 40 with
It receives the enable signal and drives the input terminal of normally closed connection and output end to disconnect according to it.
2 scheme through the foregoing embodiment, can be by power detection module 50 come the fortune of various power supplys in acquisition system
Market condition, and a power failure signal is exported when any power supply breaks down, and power failure is believed via switch module 40
Number conversion generates an enable signal to drive 10 module of protective switch circuit, and 10 module of protective switch circuit is enabled according to this
The next connection quickly blocked between pwm signal output end 20 and load 30 of signal reaches protection power source and load 30 in power supply event
Barrier operation may be to the purpose that patient damages.
Embodiment 3
In conjunction with Fig. 4, a kind of specific implementation electricity of power detection module 50 in above-described embodiment 2 is given in the present embodiment
Lu Tu, due to may include multiple power supply signals, such as positive and negative power supply signal, positive power signal, therefore electricity in power supply to be detected
Source detection module 50 includes multiple power supply comparing units, such as at least the first power supply comparing unit 51 and the multiple second sources in figure
Comparing unit 52, wherein the case where the first power supply comparing unit 51 is positive for detecting power supply to be detected, negative power signal, the
Two power supply comparing units 52 are for detecting the case where power supply to be detected is positive power signal.It should be appreciated that the power detecting mould
Block 50 can be with regard to only one power detecting power supply, for example, the first power supply comparing unit 51 or second source comparing unit
52, it can also be the combination of the first power supply comparing unit 51 or second source comparing unit 52, it below will be in detail to various electricity
Source comparing unit is explained.
Embodiment 4
Specifically, Fig. 5 is referred to, a kind of implementation electricity of the first power supply comparing unit 51 in power detection module 50 is given
Lu Tu, the first power supply comparing unit 51 include resistance R51, resistance R52, resistance R53, resistance R54, resistance R55, resistance R56, on
Pull-up resistor R57, capacitor C51, voltage-stabiliser tube D51, predetermined reference voltage signal and amplifier U51 and amplifier U52, amplifier U51
Inverting input terminal connect predetermined reference voltage signal, the non-inverting input terminal of amplifier U51 passes through resistance R51 connection electricity to be detected
Positive power signal V1 (such as+15V) in source, and be grounded by capacitor C51, resistance R53 is connected in parallel in the two of capacitor C51
End, the inverting input terminal of amplifier U52 by resistance R52 connection predetermined reference voltage signal, and by resistance R54 connection survey to
The negative power signal V2 (such as -15V) in power supply is detected, the cathode of voltage-stabiliser tube D51 connects the inverting input terminal of amplifier U52,
The plus earth of voltage-stabiliser tube D51, the non-inverting input terminal of amplifier U52 pass through the homophase input of resistance R55 connection amplifier U51
End, and be grounded by resistance R56, the output end of amplifier U51 and amplifier U52 connect pull-up resistor R57 and jointly as electricity
The output end of source detection module 50.
4 circuit structure through the foregoing embodiment can be used for being detected as in positive-negative power power supply system, such as generally will be electric
The voltage operation amplitude in source is arranged in 2V or so, i.e., 2V or so is set by predetermined reference voltage signal, then positive power signal
V1 (such as+15V) if voltage value reduce amplitude be more than the voltage value (when such as 2V) of predetermined reference voltage signal to 13V when,
So the first power detecting will export a power failure signal (power supply event in the present embodiment at output end (i.e. comparator U51)
Hindering signal is that high level is effective)；Similarly, negative power signal V2 (such as -15V) is also the same.
More specifically, the predetermined reference voltage signal in the first power supply comparing unit 51 can be generated by a reference voltage
Unit 511 generates, and incorporated by reference to Fig. 5, reference voltage generation unit 511 is at least by a power supply voltage signal, resistance R58 and voltage-stabiliser tube
D52 is constituted, and one end of the resistance R58 connects the power supply V3, the output of other end generation unit 511 as the reference voltage
Hold and be connected to the cathode of the voltage-stabiliser tube D52, the plus earth of the voltage-stabiliser tube D52.Reference voltage generation unit 511 it is defeated
What outlet was exported is exactly the pressure value of predetermined reference voltage signal, it should be understood that in the actual implementation process, can pass through resistance
R58 and power supply V3 size adjust the pressure value of predetermined reference voltage signal, and which is not described herein again.
Embodiment 5
Further, referring back to Fig. 6, a kind of implementation of second source comparing unit 52 in power detection module 50 is shown
Circuit diagram, if shown, second source comparing unit 52 includes resistance R59, resistance R510, capacitor C52 and comparator U53, than
Inverting input terminal compared with device U53 connects predetermined reference voltage signal, and the non-inverting input terminal of comparator U53 is connected by resistance R59
The positive power signal (power supply V4) to be detected, and be grounded by the capacitor C52, the resistance R510 is connected in parallel in institute
State the both ends of capacitor C52, the output end of the capacitor C52 as the second source comparing unit 52 output end and connect institute
State pull-up resistor R57.Circuit structure in the present embodiment 5 can be used as power detection module 50, for only having in detection system
Or the case where only needing single positive supply to power.
It further, can also be by the second source comparing unit 52 and above-described embodiment 4 in above-described embodiment 5
One power supply comparing unit 51 is combined as power detection module 50, may refer to Fig. 7, is equivalent to and compares second source
Unit 52 is connected between predetermined reference voltage signal and pull-up resistor R57, since above-described embodiment 4 and 5 has been presented in detail
Thin connection type, which is not described herein again.
Embodiment 6
Fig. 8 is referred to, a kind of embodiment circuit diagram of switch module 40 in the present invention is given, as shown, described
Switch module 40 is transistor, wherein transistor Q41 specifically selects N-type metal-oxide-semiconductor Q41, and the grid of N-type metal-oxide-semiconductor Q41 is for connection
The drain electrode of power detection module 50, N-type metal-oxide-semiconductor Q41 passes through one power supply V5 (15V) of resistance R41 connection, the source of N-type metal-oxide-semiconductor Q41
Pole grounding connection.
Specifically, 10 module of protective switch circuit in load protection circuit device and the circuit structure one in embodiment 2
Sample, therefore which is not described herein again, the switch module 40 being described more detail below in the present embodiment 6 be how with protective switch circuit 10
Cooperated to realize 30 protection of load, incorporated by reference to Fig. 9, when the N-type metal-oxide-semiconductor Q41 grid in switch module 40 receives electricity
After the power failure signal exported in source detection module 50, the drain electrode of N-type metal-oxide-semiconductor Q41 and source conduction, so that protection is opened
The enable end on powered-down road 10 is grounded, and also that is, the output of switch module 40 one is low level enable signal, protection in this way is opened
The drain electrode of N-type metal-oxide-semiconductor Q11 and source electrode are blocked in powered-down road 10, to block 30 work of load.
Preferably, a light emitting diode can also be concatenated between the drain electrode of N-type metal-oxide-semiconductor Q41 and resistance R41 again in fig. 8
D41, in this way, switch module 40 receives fault-signal when making drain electrode and the source conduction of N-type metal-oxide-semiconductor Q41, light emitting diode
D41 will be lit, to achieve the purpose that police instruction.
Embodiment 7
Further, on the basis of above-described embodiment 6, referring back to Figure 10, switch module 40 in the present invention is given
Another embodiment circuit diagram, as shown, further include transistor Q42 and relay SW41 in the switch module 40,
In, transistor equally uses N-type metal-oxide-semiconductor Q42, normally closed switch one end of the grid connection relay SW41 of metal-oxide-semiconductor Q42, and MOS
The grid of pipe Q42 also passes through the power supply V6 of one 3.3V of resistance R42 connection, the other end grounding connection of relay SW41, metal-oxide-semiconductor
The drain electrode of the drain electrode connection metal-oxide-semiconductor Q41 of Q42, the source electrode ground connection of metal-oxide-semiconductor Q42, relay SW41 are used to detect heat alarm, and
The heat alarm is responded to disconnect relay SW41 switch, such metal-oxide-semiconductor Q42 conducting, diode D41 is lit, while
40 output end of switch module also exports a low level signal.In the present embodiment, relay SW41 is for detecting heat alarm simultaneously
The normally closed switch of relay SW41 is disconnected after detecting heat alarm, and exports an enable signal outward.
Further, it in order to make those skilled in the art be better understood when technical solution of the present invention, enumerates below
One of the invention one practices.Such as the load protection circuit device in the present invention is applied in ultrasound knife medical instrument,
For protecting output loading 30, referring to Figure 11, power detection module 50 can be combined using multiple power supply comparing units,
Then by the 50 connection switch module 40 of power detection module, and switch module 40 is separately connected multiple protective switch circuits
10 connections the case where (because, there may be multiple output loading 30 in practice), the input terminal of each protective switch circuit 10 and
Output end is separately connected PMW signal input part and output loading 30, in the load protection circuit device provided through the invention
Power detection module 50 carrys out the working condition of power supply in detection system, and defeated by power detection module 50 when power supply breaks down
Power failure signal out, then receive the fault-signal via switch module 40 and generate an enable signal according to it, and by being somebody's turn to do
Enable signal come drive protective switch circuit 10 work, PMW signal output end is connected with the blocking of output loading 30, thus
Achieve the purpose that quickly to stop 30 work of load, and then reaches protection medical patient and receive unexpected injury, while also protecting system
It is unlikely to be burned.
In conclusion load protection circuit device provided by the present invention, is opened by enable signal come fast driving protection
Disconnection protection act is made on powered-down road 10, and provides abundant and selectable power detection module 50 simultaneously, each to be suitable for
Kind power detecting situation, ensure that the comprehensive and safety of power detecting, still further provides various early warning protections, is occurring
Failure can be found when failure in time and effectively disconnects 30 working lines of load, reaches while protecting system and the mesh of patient
's.So the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (12)
1. a kind of load protector characterized by comprising
Power detection module, for obtaining the voltage value of power supply to be detected and being compared it with predetermined reference voltage value, and
A power failure signal is generated when the voltage value Amplitude of Hypotensive of the power supply to be detected is more than the predetermined reference voltage value, and
It is exported；
The power detection module is one for detecting the first power supply that the power supply to be detected is positive power signal, negative power signal
Comparing unit, the first power supply comparing unit include resistance R51, resistance R52, resistance R53, resistance R54, resistance R55, resistance
R56, pull-up resistor R57, capacitor C51, voltage-stabiliser tube D51, predetermined reference voltage signal and amplifier U51 and amplifier U52, institute
The inverting input terminal connection predetermined reference voltage signal of amplifier U51 is stated, the non-inverting input terminal of the amplifier U51 passes through resistance
R51 connects the positive power signal in the power supply to be detected, and is grounded by capacitor C51, and the resistance R53 is connected in parallel in institute
The both ends of capacitor C51 are stated, the inverting input terminal of the amplifier U52 is led to by resistance R52 connection predetermined reference voltage signal
It crosses resistance R54 and connects negative power signal in the power supply to be detected, the cathode of the voltage-stabiliser tube D51 connects the amplifier
The non-inverting input terminal of the inverting input terminal of U52, the plus earth of the voltage-stabiliser tube D51, the amplifier U52 passes through resistance R55
The non-inverting input terminal of the amplifier U51 is connected, and is grounded by resistance R56, the amplifier U51 and amplifier U52's is defeated
Outlet connects the pull-up resistor R57 and the output end as the power detection module jointly；
Switch module connects the power detection module, for receiving the power failure signal and generating an enabled letter according to it
Number, and exported；
Protective switch circuit module, input terminal and output end and confession including normally closed connection connect the enabled of the switch module
End, the enable end connect the switch module with receive the enable signal and driven according to it normally closed connection input terminal and
Output end disconnects.
2. load protector according to claim 1, which is characterized in that further include in the first power supply comparing unit
One for generating the reference voltage generation unit of the predetermined reference voltage signal, and the reference voltage generation unit is at least by an electricity
Source voltage signal V3, resistance R58 and voltage-stabiliser tube D52 are constituted, and one end of the resistance R58 connects a power supply voltage signal
V3, the other end output end of generation unit and are connected to the cathode of the voltage-stabiliser tube D52 as the reference voltage, the voltage-stabiliser tube
The plus earth of D52.
3. load protector according to claim 1, which is characterized in that the switch module includes metal-oxide-semiconductor Q41, electricity
Input terminal of the grid of resistance R41 and power supply V5, the metal-oxide-semiconductor Q41 as the input terminal connection power detection module of switch module,
The metal-oxide-semiconductor Q41 drain electrode as switch module output end and the power supply V5 is connected to by the resistance R41, it is described
The source electrode of metal-oxide-semiconductor Q41 is grounded.
4. load protector according to claim 3, which is characterized in that the switch module further includes a relay
SW41, metal-oxide-semiconductor Q42 and resistance R42 and power supply V6, the grid of the metal-oxide-semiconductor Q42 connect the normally closed of relay SW41 and open
One end is closed, and the power supply V6 is connected to by resistance R42, the normally closed switch other end ground connection of the relay SW41 is described
The switch triggering end of relay SW41 is supplied in response to heat alarm, and the drain electrode of the metal-oxide-semiconductor Q42 connects the leakage of the metal-oxide-semiconductor Q41
Pole, the source electrode ground connection of the metal-oxide-semiconductor Q42.
5. load protector according to claim 3, which is characterized in that the drain electrode of the metal-oxide-semiconductor Q41 and resistance R41
A light emitting diode D41 is also in series in connection line.
6. load protector according to claim 3, which is characterized in that the protective switch circuit module includes resistance
R11, resistance R12, diode D11, diode D12 and metal-oxide-semiconductor Q11 and power supply, described in the drain electrode of the metal-oxide-semiconductor Q11 is used as
The input terminal of protective switch circuit, output end of the source electrode of the metal-oxide-semiconductor Q11 as the protective switch circuit, the metal-oxide-semiconductor
The grid of Q11 connects the grid of the metal-oxide-semiconductor Q11 by the resistance R11 connection power supply, the anode of the diode D11
Pole, enable end of the cathode of the diode D11 as the protective switch circuit, the anode of the diode D12 pass through institute
The source electrode that resistance R12 connects the metal-oxide-semiconductor Q11 is stated, the cathode of the diode D12 connects the enabled of the protective switch circuit
End.
7. a kind of load protector characterized by comprising
Power detection module, for obtaining the voltage value of power supply to be detected and being compared it with predetermined reference voltage value, and
A power failure signal is generated when the voltage value Amplitude of Hypotensive of the power supply to be detected is more than the predetermined reference voltage value, and
It is exported；
The power detection module is one for detecting the second source comparing unit that the power supply to be detected is positive power signal, institute
Stating second source comparing unit includes resistance R59, resistance R510, capacitor C52 and comparator U53, the reverse phase of the comparator U53
Input terminal connects predetermined reference voltage signal, and the non-inverting input terminal of the comparator U53 passes through resistance R59 connection institute to be detected
Positive power signal is stated, and is grounded by the capacitor C52, the resistance R510 is connected in parallel in the both ends of the capacitor C52, institute
State output end of the output end of comparator U53 as the second source comparing unit, the second source comparing unit it is defeated
Outlet connects pull-up resistor R57；
Switch module connects the power detection module, for receiving the power failure signal and generating an enabled letter according to it
Number, and exported；
Protective switch circuit module, input terminal and output end and confession including normally closed connection connect the enabled of the switch module
End, the enable end connect the switch module with receive the enable signal and driven according to it normally closed connection input terminal and
Output end disconnects.
8. load protector according to claim 7, which is characterized in that it further include the first power supply comparing unit, it is described
First power supply comparing unit further includes one for generating the reference voltage generation unit of the predetermined reference voltage signal, the reference
Voltage generating unit is at least made of a power supply voltage signal V3, resistance R58 and voltage-stabiliser tube D52, and one end of the resistance R58 connects
Meet the power supply voltage signal V3, the other end output end of generation unit and is connected to the voltage-stabiliser tube as the reference voltage
The cathode of D52, the plus earth of the voltage-stabiliser tube D52.
9. load protector according to claim 7, which is characterized in that the switch module includes metal-oxide-semiconductor Q41, electricity
Input terminal of the grid of resistance R41 and power supply V5, the metal-oxide-semiconductor Q41 as the input terminal connection power detection module of switch module,
The metal-oxide-semiconductor Q41 drain electrode as switch module output end and the power supply V5 is connected to by the resistance R41, it is described
The source electrode of metal-oxide-semiconductor Q41 is grounded.
10. load protector according to claim 9, which is characterized in that the switch module further includes a relay
SW41, metal-oxide-semiconductor Q42 and resistance R42 and power supply V6, the grid of the metal-oxide-semiconductor Q42 connect the normally closed of relay SW41 and open
One end is closed, and the power supply V6 is connected to by resistance R42, the normally closed switch other end ground connection of the relay SW41 is described
The switch triggering end of relay SW41 is supplied in response to heat alarm, and the drain electrode of the metal-oxide-semiconductor Q42 connects the leakage of the metal-oxide-semiconductor Q41
Pole, the source electrode ground connection of the metal-oxide-semiconductor Q42.
11. load protector according to claim 9, which is characterized in that the drain electrode of the metal-oxide-semiconductor Q41 and resistance R41
A light emitting diode D41 is also in series in connection line.
12. load protector according to claim 9, which is characterized in that the protective switch circuit module includes electricity
R11, resistance R12, diode D11, diode D12 and metal-oxide-semiconductor Q11 and power supply are hindered, the drain electrode of the metal-oxide-semiconductor Q11 is as institute
State the input terminal of protective switch circuit, output end of the source electrode of the metal-oxide-semiconductor Q11 as the protective switch circuit, the MOS
The grid of pipe Q11 connects the metal-oxide-semiconductor Q11's by the resistance R11 connection power supply, the anode of the diode D11
Grid, enable end of the cathode of the diode D11 as the protective switch circuit, the anode of the diode D12 pass through
The resistance R12 connects the source electrode of the metal-oxide-semiconductor Q11, and the cathode of the diode D12 connects making for the protective switch circuit
It can end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510198330.0A CN104810781B (en) | 2015-04-24 | 2015-04-24 | A kind of protective switch circuit and load protector |
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| CN201510198330.0A CN104810781B (en) | 2015-04-24 | 2015-04-24 | A kind of protective switch circuit and load protector |
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| CN104810781B true CN104810781B (en) | 2019-01-22 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108599747B (en) * | 2018-04-09 | 2022-06-28 | 北京市科通电子继电器总厂有限公司 | Double-signal on-off control circuit and system |
| CN111766533B (en) * | 2019-04-01 | 2021-10-01 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8040647B2 (en) * | 2008-11-11 | 2011-10-18 | Infineon Technologies Austria Ag | System and method for protection against loss of battery in reverse battery protected devices |
| CN103117536A (en) * | 2013-01-15 | 2013-05-22 | 费新华 | Storage battery protective circuit |
| CN104242252A (en) * | 2013-06-14 | 2014-12-24 | 海洋王（东莞）照明科技有限公司 | Battery over-discharge protecting circuit |
| CN104319742A (en) * | 2014-10-28 | 2015-01-28 | 无锡中星微电子有限公司 | Battery protection circuit |
| CN204651881U (en) * | 2015-04-24 | 2015-09-16 | 重庆康美唯外科器械有限公司 | A kind of protection switch circuit and load protector |
-
2015
- 2015-04-24 CN CN201510198330.0A patent/CN104810781B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8040647B2 (en) * | 2008-11-11 | 2011-10-18 | Infineon Technologies Austria Ag | System and method for protection against loss of battery in reverse battery protected devices |
| CN103117536A (en) * | 2013-01-15 | 2013-05-22 | 费新华 | Storage battery protective circuit |
| CN104242252A (en) * | 2013-06-14 | 2014-12-24 | 海洋王（东莞）照明科技有限公司 | Battery over-discharge protecting circuit |
| CN104319742A (en) * | 2014-10-28 | 2015-01-28 | 无锡中星微电子有限公司 | Battery protection circuit |
| CN204651881U (en) * | 2015-04-24 | 2015-09-16 | 重庆康美唯外科器械有限公司 | A kind of protection switch circuit and load protector |
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