CN109088393A - Under-voltage protecting circuit and electronic equipment - Google Patents
Under-voltage protecting circuit and electronic equipment Download PDFInfo
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- CN109088393A CN109088393A CN201710445745.2A CN201710445745A CN109088393A CN 109088393 A CN109088393 A CN 109088393A CN 201710445745 A CN201710445745 A CN 201710445745A CN 109088393 A CN109088393 A CN 109088393A
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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
- H02H3/24—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 undervoltage or no-voltage
- H02H3/243—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 undervoltage or no-voltage for DC systems
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Abstract
A kind of under-voltage protecting circuit and electronic equipment; under-voltage protecting circuit includes: undervoltage detection circuit; input port is coupled to receive input voltage; the first voltage-stabiliser tube is in series in undervoltage detection circuit; it is greater than the breakdown voltage of the first voltage-stabiliser tube in response to input voltage; the output end of undervoltage detection circuit generates the first conducting voltage, and the first conducting voltage is associated with input voltage and breakdown voltage；Voltage transmission circuit, it is respectively coupled to input port and output port, its control terminal accesses the first conducting voltage, it is greater than the first preset value in response to the first conducting voltage, voltage transmission circuit control input port to the access between output port is connected, it is less than or equal to the first preset value, voltage transmission circuit control input port to the access shutdown between output port in response to the first conducting voltage.Circuit complexity, cost and power consumption can be reduced using technical solution of the present invention, and improve the stability of circuit working state.
Description
Technical field
The present invention relates to circuit protection technical field, in particular to a kind of under-voltage protecting circuit and electronic equipment.
Background technique
In the electronic device, due to short trouble etc., being greatly lowered very can occur in a short time in line voltage distribution
To disappear the phenomenon that, damage can be brought to route and electronic equipment, for example, make motor it is tired fall, stall, thus generation be several times as much as
The overcurrent of rated current, burns out motor.Under-voltage protection is indicated when line voltage distribution is reduced to critical voltage, is carried out to equipment
The purpose of the movement of protection, under-voltage protection mainly prevents equipment from burning because of overload.Specifically, can by relay or
Other devices with open pipe function cut off supply access of the line voltage distribution to electronic equipment, to realize under-voltage protection.
Currently, the mode that under-voltage protecting circuit in the prior art mostly uses greatly voltage to compare determine input voltage whether mistake
It is low, carrying out under-voltage protection by way of cutting off the transmission channel of the input voltage when too low.Specifically, the input voltage
It can be busbar voltage, by acquisition busbar voltage, then the busbar voltage divided to obtain an operation voltage, it is described dynamic
Make voltage to be compared with reference voltage, the comparator that can be relatively made of integrated operational amplifier (abbreviation amplifier) is real
It is existing, decide whether to trigger under-voltage protection mechanism further according to comparison result.If the operation voltage is lower than the reference voltage, root
Under-voltage trigger signal is generated according to the comparison result, the power switch tube for being used for transmission the busbar voltage to electronic equipment is closed
It is disconnected, realize under-voltage protection.
Firstly, needing that bleeder circuit, amplifier is arranged in above-mentioned under-voltage protecting circuit and being used to provide the described reference voltage
Voltage source (such as band gap reference) may also need additionally to be arranged low-tension supply and power to the amplifier, so that circuit complexity
And higher cost.Secondly, the leakage current that above-mentioned each device generates is larger, quiescent dissipation is higher, since the busbar voltage is general
It is higher, and the bleeder circuit divided to it is generally made of divider resistance, therefore the power consumption of its consumption is especially pronounced.Again,
Since the driving capability of the under-voltage trigger signal is limited, so that the circuit is generally unsuitable for powerful application scenarios.This
Outside, existing under-voltage protecting circuit at work, if the busbar voltage is attached just at critical state or in critical state
Nearly fluctuation, circuit is easy to appear hiccup phenomenon, so that unstable working condition.
Therefore, under-voltage protecting circuit in the prior art is at high cost, power consumption is big, application scenarios are limited and work shape
The defect of state stability difference.
Summary of the invention
Present invention solves the technical problem that be how to reduce the circuit complexity, cost and power consumption of under-voltage protecting circuit, and
Improve the stability of circuit working state.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of under-voltage protecting circuit, the under-voltage protecting circuit
Include: undervoltage detection circuit, couples input port to receive input voltage, the first pressure stabilizing is in series in the undervoltage detection circuit
Pipe, the breakdown voltage of first voltage-stabiliser tube is greater than in response to the input voltage, and the output end of the undervoltage detection circuit produces
Raw first conducting voltage, first conducting voltage are associated with the input voltage and breakdown voltage；Voltage transmission circuit, respectively
The input port and output port are coupled, control terminal accesses first conducting voltage, in response to first electric conduction
Pressure is greater than the first preset value, and input port to the access between the output port described in the voltage transmission circuit control is led
It is logical, it is less than or equal to first preset value in response to first conducting voltage, is inputted described in the voltage transmission circuit control
Port to the access between the output port turns off.
Optionally, the voltage transmission circuit includes: first switch circuit, and control terminal accesses first electric conduction
Pressure is greater than first preset value in response to first conducting voltage, and the first switch circuit conducting is led with generating second
Be powered pressure, is less than or equal to first preset value, the first switch circuit shutdown in response to first conducting voltage；Second
Switching circuit, control terminal access second conducting voltage, and first end couples the input port, and second end couples institute
Output port is stated, in response to second conducting voltage, the second switch circuit conducting.
Optionally, the first switch circuit includes: first switch tube, and control terminal accesses first conducting voltage,
Its first end ground connection, second end directly or indirectly export second conducting voltage.
Optionally, the first switch circuit further include: the first potential-divider network, first end connect the input port,
Its second end connects the second end of the first switch tube, and the partial pressure output end output described second of first potential-divider network is led
Be powered pressure.
Optionally, the first switch circuit further include: capacitor, one end of the capacitor connect the first switch tube
Control terminal, other end ground connection.
Optionally, the first switch circuit further include: the second voltage-stabiliser tube, cathode couple the control of the first switch tube
End processed, plus earth.
Optionally, the second switch circuit includes: second switch, described in control terminal directly or indirectly couples
The first end of the control terminal of second switch circuit, the second switch couples the input port, the second switch
Second end couples the output port.
Optionally, the second switch circuit further include: third voltage-stabiliser tube, cathode couple the input port, just
Pole couples the control terminal of the second switch circuit.
Optionally, the undervoltage detection circuit further include: the second potential-divider network is connected with first voltage-stabiliser tube, described
The partial pressure output end of second potential-divider network exports first conducting voltage.
Optionally, the cathode of first voltage-stabiliser tube connects the input port, the anode connection of first voltage-stabiliser tube
The first end of second potential-divider network, the second end ground connection of second potential-divider network.
In order to solve the above technical problems, the embodiment of the present invention also provides a kind of electronic equipment, the electronic equipment includes institute
State under-voltage protecting circuit.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
The under-voltage protecting circuit of the embodiment of the present invention may include undervoltage detection circuit and voltage transmission circuit, this is under-voltage guarantor
Protection circuit to the whether under-voltage detection of the input voltage is realized by the voltage-stabiliser tube in the undervoltage detection circuit.It is first
First, so that circuit is simple, it is easy to real without other reference sources are accessed without additional power supply due to the undervoltage detection circuit
It applies, cost is relatively low.Secondly, the undervoltage detection circuit uses the voltage-stabiliser tube instead of resistive elements and comparator, working
Leakage current is smaller in the process, and quiescent dissipation is lower.Again, according to the device property of voltage-stabiliser tube, the under-voltage protecting circuit is owed
Hysteresis voltage can be generated between pressure protection trigger voltage and the trigger voltage resumed work, so that facing when the input voltage is in
Boundary's state or when being fluctuated near critical state, the high stability of circuit working state.
Furthermore, the undervoltage detection circuit can also include the second potential-divider network, and under-voltage protecting circuit can lead to
The allotment for crossing the intrinsic standoff ratio to second potential-divider network, neatly configures the first conducting voltage, to configure indirectly
The under-voltage protection trigger voltage of the under-voltage protecting circuit.
Furthermore, the first switch circuit can also include capacitor, and the capacitor can be used for filtering out described first
The voltage glitch of the control terminal of switching tube.
Furthermore, the first switch circuit can also include the second voltage-stabiliser tube, the setting of second voltage-stabiliser tube,
The first switch tube can be protected in the overtension of the control terminal of first switch tube, prevent it from burning.
Furthermore, the second switch circuit can also include third voltage-stabiliser tube.On the one hand, the third voltage-stabiliser tube
Setting can protect second switch；On the other hand, when the input voltage constantly increases, the third voltage-stabiliser tube can be with
Breakdown, the leakage current that the input voltage generates can be successively via the third voltage-stabiliser tube, second resistance and first switch
Pipe is released to ground, and the electric current of the control terminal of the second switch effectively increases, and can make the under-voltage of the embodiment of the present invention
Circuit is protected to be suitable for powerful application scenarios.
Detailed description of the invention
Fig. 1 is a kind of schematic block diagram of under-voltage protecting circuit of the embodiment of the present invention；
Fig. 2 is the schematic block diagram of another under-voltage protecting circuit of the embodiment of the present invention；
Fig. 3 is the circuit diagram of the under-voltage protecting circuit of first embodiment of the invention；
Fig. 4 is the circuit diagram of the under-voltage protecting circuit of second embodiment of the invention；
Fig. 5 is the circuit diagram of the under-voltage protecting circuit of third embodiment of the invention；
Fig. 6 is the circuit diagram of the under-voltage protecting circuit of fourth embodiment of the invention.
Specific embodiment
As described in the background section, under-voltage protecting circuit in the prior art may include bleeder circuit, comparator and
Switching tube determines whether the input voltage of circuit is too low, and the input voltage is cut off when too low in such a way that voltage compares
The mode of transmission channel carries out under-voltage protection.Since under-voltage protecting circuit in the prior art needs additional power supply, and have compared with
Big leakage current, and when its input voltage fluctuates near critical state, circuit is easy to appear hiccup phenomenon, therefore it has
Have that at high cost, power consumption is big, application scenarios are limited and the defect of stability under working conditions difference.
The embodiment of the present invention proposes that a kind of includes the under-voltage protecting circuit of undervoltage detection circuit and voltage transmission circuit, should
Under-voltage protecting circuit is to be realized by voltage-stabiliser tube to the whether under-voltage detection of the input voltage, so that it is with circuit complexity
Spend the advantage of the high stability of low, at low cost, small power consumption and working condition.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to this
The specific embodiment of invention is described in detail.
Fig. 1 is a kind of schematic block diagram of under-voltage protecting circuit of the embodiment of the present invention.
As shown in Figure 1, the under-voltage protecting circuit 10 of the embodiment of the present invention may include: undervoltage detection circuit 101 and voltage
Transmission circuit 102.The under-voltage protecting circuit 10 can be applied in various electronic equipments appropriate.
Wherein, the coupling input port (not shown) of undervoltage detection circuit 101 is described to owe to receive input voltage vin
The first voltage-stabiliser tube D1 is in series in pressure detection circuit 101.In response to the input voltage vin greater than the first voltage-stabiliser tube D1's
The output end of breakdown voltage, the undervoltage detection circuit 101 generates the first conducting voltage V1, the first conducting voltage V1 and institute
Input voltage vin is stated to be associated with breakdown voltage.
The voltage transmission circuit 102 is respectively coupled to the input port and output port (not shown), and the voltage passes
The control terminal on transmission of electricity road accesses the first conducting voltage V1.It is greater than the first preset value in response to the first conducting voltage V1,
The voltage transmission circuit 102 controls the input port to the access conducting between the output port, by the input electricity
Pressure Vin is transmitted to the output port, so that output port output has output voltage Vout；It is led in response to described first
The pressure that is powered V1 is less than or equal to first preset value, and the voltage transmission circuit 102 controls the input port to the output
Access shutdown between port, to realize the under-voltage protection to the output port.
In specific implementation, the input voltage vin can be DC bus-bar voltage namely voltage changer (is schemed not
Show) in the voltage that directly exports of transformer, but not limited to this, the input voltage vin can be any appropriately sized straight
Galvanic electricity pressure, the embodiment of the present invention do not limit source and the size of the input voltage vin.
It is understood to one skilled in the art that the first voltage-stabiliser tube (also known as Zener diode (ZenerDiode)) D1 tool
There is breakdown voltage.When the first voltage-stabiliser tube D1 forward conduction, VA characteristic curve and conventional diode are almost the same；
When the breakdown potential less than the first voltage-stabiliser tube D1 to the first voltage-stabiliser tube D1 application reverse voltage while the backward voltage
When pressure, the backward resistance of the first voltage-stabiliser tube D1 is very big, and reverse leakage current is minimum；When the backward voltage closes on described first
When the breakdown voltage of voltage-stabiliser tube D1, reverse leakage current increases suddenly, this process is known as puncturing, and the first voltage-stabiliser tube D1's is anti-
It is down to the value of very little suddenly to resistance, when the backward voltage continues growing, the voltage at the both ends the first voltage-stabiliser tube D1 is basic
This stable voltage is generally known as its clamping voltag, clamping voltag and its breakdown potential to realize voltage stabilizing function by upper stabilization
It presses approximately equal.
In specific implementation, the first voltage-stabiliser tube D1 can inhibit (Transient Voltage for transient state
Suppressor, abbreviation TVS) diode, or other kinds of voltage-stabiliser tube, the present embodiment is without specifically limited.Into
For one step, compared to conventional voltage-stabiliser tube, TVS diode has bigger breakdown current, has fast response time, transient state function
The advantages that rate is big, leakage current is low, breakdown voltage deviation is small, clamping voltag is relatively easy to control.
In the present embodiment, the under-voltage protecting circuit 10 is series between the input port and output port, is used
Whether the first voltage-stabiliser tube D1 is to detect the input voltage vin under-voltage.When the input voltage vin is greater than described first
When the breakdown voltage of voltage-stabiliser tube D1, it can determine whether out that the input voltage vin is not in under-voltage condition, further, when described
When one conducting voltage V1 is met greater than first preset value, the voltage transmission circuit 102 controls the input port to institute
The access conducting namely the output port stated between output port can normally receive the input voltage, at this point, described
Under-voltage protecting circuit 10 does not take under-voltage protection measure；And when the input voltage vin is less than or equal to the first voltage-stabiliser tube D1
Breakdown voltage when, can determine whether out that the input voltage vin is in under-voltage condition, further, when first conducting voltage
When V1 is less than or equal to first preset value, the voltage transmission circuit 102 controls the input port to the output port
Between access shutdown, to the output port implement under-voltage protection.
Firstly, since the under-voltage protecting circuit 10 is by described to the whether under-voltage detection of the input voltage vin
What the first voltage-stabiliser tube D1 in undervoltage detection circuit 101 was realized, therefore, the undervoltage detection circuit 101 is powered without additional,
Without accessing other reference sources, circuit is simple, and easy to implement, cost is relatively low.
Secondly, the undervoltage detection circuit 101 uses the first voltage-stabiliser tube D1 instead of resistive elements and comparator, it can
It prevents from generating biggish leakage current during the work time, quiescent dissipation is lower.
Again, according to the device property of voltage-stabiliser tube in practice, the breakdown voltage of voltage-stabiliser tube has a voltage range, the electricity
Pressure range is generally influenced by factors such as temperature.For example, the first voltage-stabiliser tube D1 that the nominal value of breakdown voltage is 27V is real
The breakdown voltage range having on border may be 25V to 29V.That is, when the input voltage vin is greater than 29V rather than 27V
When, the first voltage-stabiliser tube D1 is just breakdown and generates the first conducting voltage V1；When the input voltage vin is lower than 25V
Rather than when 27V, the first voltage-stabiliser tube D1 is just in not breakdown state and stops generating the first conducting voltage V1.By
It can make the under-voltage protecting circuit 10 that there is under-voltage protection trigger voltage and extensive in the device property of the first voltage-stabiliser tube D1
It returns to work the trigger voltage of work, the two produces hysteresis voltage, and then generates a kind of effect of sluggish triggering, so that when described under-voltage
Protect circuit 10 at work, though the input voltage vin just at under-voltage with non-under-voltage critical state, or critical
State nearby fluctuates, and hiccup phenomenon will not occur in circuit, so that the high stability of its working condition.
In summary, the under-voltage protecting circuit 10 of the embodiment of the present invention have circuit complexity is low, at low cost, small power consumption with
And the advantage of the high stability of working condition.
First embodiment
Fig. 2 is the schematic block diagram of another under-voltage protecting circuit of the embodiment of the present invention.
As shown in Fig. 2, in specific implementation, the voltage transmission circuit 102 may include: first switch circuit S1 and
Two switching circuit S2.Wherein, the control terminal of the first switch circuit S1 accesses the first conducting voltage V1.In response to described
First conducting voltage V1 is greater than first preset value, and the first switch circuit S1 conducting is to generate the second conducting voltage V2；
It is less than or equal to first preset value, the first switch circuit S1 shutdown, Ye Jiting in response to the first conducting voltage V1
Only generate the second conducting voltage V2.
Together referring to figs. 2 and 3, in specific implementation, the first switch circuit S1 may include first switch tube
MN1, control terminal access the first conducting voltage V1, and first end can be grounded, and second end is directly or indirectly defeated
The second conducting voltage V2 out.
Wherein, the control terminal of the second switch circuit S2 accesses the second conducting voltage V2, the second switch electricity
The first end of road S2 couples the input port, and the second end of the second switch circuit S2 couples the output port.Response
In the second conducting voltage V2, the second switch circuit S2 conducting.
In specific implementation, the second switch circuit S2 may include second switch MP1, control terminal directly or
The control terminal of the second switch circuit S2 is coupled indirectly, and the first end of the second switch MP1 couples the input terminal
Mouthful, the second end of the second switch MP1 couples the output port.
Preferably, the first switch tube MN1 can be NMOS transistor, and the second switch MP1 can be PMOS
Transistor, but not limited to this, the first switch tube MN1 can also be PMOS transistor, and the second switch MP1 can be with
For NMOS tube, or both for bipolar junction transistor, circuit connecting mode can be suitably adjusted in actual implementation.
It should be noted that the first switch circuit S1 and second switch circuit S2 can be switching tube, can also be
The combination of other switching devices or switching device other than switching tube can be discrete device and be also possible to be packaged in chip
Integrated switching circuit, the present embodiment not introduce one by one by expansion.
It should also be noted that, only symbolically depicting the first end ground connection of the first switch circuit S1, institute in Fig. 2
The second end output for stating first switch circuit S1 has the case where the second conducting voltage V2, but the present embodiment to this and without
It is specifically limited, for example, the first end of the first switch circuit can access the Voltage Reference port of any other potential value, only
The the second conducting voltage V2 for wanting it to generate can control the second switch circuit S2 conducting or shutdown.
It is further to note that the voltage transmission circuit 102 is not limited to using the first switch circuit S1 and the
Two switching circuit S2 are realized.For example, the voltage transmission circuit 102 can also use single, three or three with upper switch electricity
It realizes on road.It is realized to the input port according to the first conducting voltage V1 between the output port as long as can satisfy
The control of access conducting or shutdown.
In the present embodiment, first preset value is the threshold voltage of the first switch tube MN1.First conducting
Voltage V1 can be the difference of the input voltage vin and the breakdown voltage of the first voltage-stabiliser tube D1.And if only if the input
It is described when the difference of the breakdown voltage of voltage Vin and the first voltage-stabiliser tube D1 is greater than the threshold voltage of the first switch tube MN1
First switch tube MN1 conducting, so that the second switch MP1 is connected, the input port is between the output port
Access conducting.
Second embodiment
Fig. 4 is the circuit diagram of the under-voltage protecting circuit of second embodiment of the invention.
The structure and original of the under-voltage protecting circuit 10 in under-voltage protecting circuit 20 and first embodiment of the invention shown in Fig. 4
To manage essentially identical, the main distinction is, in the under-voltage protecting circuit 20, the undervoltage detection circuit 101 (referring to Fig. 1)
It can also include the second potential-divider network (not indicated in figure) that second potential-divider network can go here and there with the first voltage-stabiliser tube D1
The partial pressure output end of connection, second potential-divider network exports the first conducting voltage V1.
It is understood to one skilled in the art that potential-divider network has a first end and a second end and divides output end, it is described
Potential-divider network is suitable for dividing the difference between the voltage of its first end and the voltage of its second end, the voltage divided
Output end output is divided via it.
It should be noted that circuit side connector of the present embodiment to second potential-divider network and the first voltage-stabiliser tube D1
Formula is without particular determination, for example, the cathode of the first voltage-stabiliser tube D1 can connect the input port, first pressure stabilizing
The anode of pipe D1 can connect the first end of second potential-divider network, and the second end of second potential-divider network can be grounded.
For another example the first end of second potential-divider network can also connect the input port, the second of second potential-divider network
End can connect the cathode of the first voltage-stabiliser tube D1, and the anode of the first voltage-stabiliser tube D1 can be grounded.In addition, described under-voltage
Detection circuit 10 can also include the electrical part other than the first voltage-stabiliser tube D1 and second potential-divider network, such as protection electricity
(not shown) etc. is hindered, then needs to readjust the circuit side connector of second potential-divider network Yu the first voltage-stabiliser tube D1
Formula.The present embodiment is only illustrated by taking circuit connecting mode shown in Fig. 4 as an example.
In specific implementation, second potential-divider network may include 3rd resistor R3 and the 4th resistance R4, wherein described
The both ends of 3rd resistor R3 can be separately connected the first end and partial pressure output end of second potential-divider network, the 4th resistance
The both ends of R4 can be separately connected the second end and partial pressure output end of second potential-divider network.Point of second potential-divider network
Pressure ratio depends on the resistance value of the 3rd resistor R3 and the 4th resistance R4.
In the present embodiment, the first conducting voltage V1 is according to the input voltage vin and the first voltage-stabiliser tube D1
What the difference between breakdown voltage was divided by the 3rd resistor R3 and the 4th resistance R4.
The under-voltage protecting circuit 20 of the present embodiment can be by the allotment of the intrinsic standoff ratio to second potential-divider network, flexibly
Ground configures the first conducting voltage V1, to configure the under-voltage protection triggering electricity of the under-voltage protecting circuit 20 indirectly
Pressure.
The more information of the present embodiment refers to the associated description to first embodiment of the invention above, no longer superfluous herein
It states.
3rd embodiment
Fig. 5 is the circuit diagram of the under-voltage protecting circuit of third embodiment of the invention.
The structure and original of the under-voltage protecting circuit 20 in under-voltage protecting circuit 30 and second embodiment of the invention shown in Fig. 5
To manage essentially identical, the main distinction is, in the under-voltage protecting circuit 30, the first switch circuit S1 (referring to fig. 2)
It can also include the first potential-divider network (not indicated in figure) that the first end of first potential-divider network connects the input port,
The second end of first potential-divider network connects the second end (such as drain electrode) of the first switch tube MP1, first partial pressure
The partial pressure output end of network exports the second conducting voltage V2.
The under-voltage protecting circuit 30 of the present embodiment can be by the allotment of the intrinsic standoff ratio to first potential-divider network, flexibly
Ground configures the second conducting voltage V2, for example, when the first end of first switch tube MN1 ground connection, described the
Two conducting voltage V2 are that the input voltage vin divides to obtain by first potential-divider network, can thus be configured described
Second conducting voltage V2, to control the second switch MP1 conducting.
In specific implementation, first potential-divider network may include first resistor R1 and second resistance R2, wherein described
The both ends of first resistor R1 can be separately connected the first end and partial pressure output end of first potential-divider network, the second resistance
The both ends of R2 can be separately connected the second end and partial pressure output end of first potential-divider network.Point of first potential-divider network
Pressure ratio depends on the resistance value of the first resistor R1 and second resistance R2.More information about first potential-divider network can join
See the description in second embodiment of the invention to second potential-divider network, details are not described herein again.
Further, the first switch circuit S1 (referring to fig. 2) can also include capacitor C1, one end of the capacitor C1
Connect the control terminal MN1 of the first switch tube, other end ground connection.The capacitor C1 is noise reduction capacitor, for filtering out described the
The voltage glitch of the control terminal of one switching tube MN1.
Further, the first switch circuit S1 (referring to fig. 2) can also include the second voltage-stabiliser tube D2, cathode coupling
Connect the control terminal of the first switch tube MN1, plus earth.The setting of the second voltage-stabiliser tube D2, can be the described 4th
The overtension at the both ends resistance R4, namely when breakdown voltage more than the second voltage-stabiliser tube D2, according to its stabilizing voltage characteristic, so that
The voltage of the control terminal of the first switch tube MN1 does not increase further, protects to the first switch tube MN1, prevents
Only it burns.
The more information of the present embodiment refers to the associated description to second embodiment of the invention above, no longer superfluous herein
It states.
Fourth embodiment
Fig. 6 is the circuit diagram of the under-voltage protecting circuit of fourth embodiment of the invention.
The structure and original of the under-voltage protecting circuit 30 in under-voltage protecting circuit 40 and third embodiment of the invention shown in Fig. 6
To manage essentially identical, the main distinction is, in the under-voltage protecting circuit 40, the second switch circuit S2 (referring to fig. 2)
It can also include third voltage-stabiliser tube D3, cathode couples the input port, and anode couples the second switch circuit S2 (ginseng
See Fig. 2) control terminal.
In the present embodiment, the third voltage-stabiliser tube D3 can be used for that the second switch MP1 is prevented to be burned out, work
Mechanism is similar with previously described second voltage-stabiliser tube D2, and details are not described herein again.
Furthermore, with the continuous raising of the input voltage vin, the first conducting voltage V1 control described the
One switching tube MN1 conducting, the second conducting voltage V2 control the second switch MN2 conducting.And work as the input voltage
When Vin is further increased, the third voltage-stabiliser tube D3 can be breakdown, and the leakage current that the input voltage vin generates can be according to
It is secondary to release via the third voltage-stabiliser tube D3, second resistance R2 and first switch tube MN1 to ground, described second can be passed through
The electric current of the control terminal of switching tube MP1 effectively increases.Scheme compared with the prior art, the under-voltage protecting circuit of the present embodiment
40 can be adapted for powerful application scenarios, namely in the input voltage vin and the higher scene of its driving current.In reality
In the parts selection on border, the first switch tube MN1 and second switch MN2 can be chosen for power tube.
In summary, the under-voltage protecting circuit 40 in the embodiment of the present invention uses only MOS transistor, voltage-stabiliser tube, resistance
And capacitor is to complete under-voltage protection to electronic equipment, scheme is simple, low in cost, and leakage current is small when work, and work is steady
Qualitative height can be applicable to powerful application scenarios.It in specific implementation, can also be according to the first voltage-stabiliser tube D1's
The device property of breakdown voltage, the resistance value of first to fourth resistance and the first switch tube MN1 and second switch MN2
The first conducting voltage V1 and the second conducting voltage V2 are adjusted, to adjust the under-voltage guarantor of the under-voltage protecting circuit 40
Protect trigger voltage, and the trigger voltage resumed work.
The more information of the present embodiment refers to the associated description to third embodiment of the invention above, no longer superfluous herein
It states.
It should be noted that herein the first voltage-stabiliser tube D1, the second voltage-stabiliser tube D2 and third voltage-stabiliser tube D3 can be with
It is that a voltage-stabiliser tube is also possible to multiple voltage-stabiliser tubes and connects, correspondingly, their breakdown voltage is a voltage-stabiliser tube
Equivalent breakdown voltage after breakdown voltage or the series connection of multiple voltage-stabiliser tubes.All resistance (or capacitor) herein can be one
Resistance (or capacitor) or multiple resistance (or capacitor) series and parallel obtain, and correspondingly, their resistance value (or capacitance) is an electricity
Equivalent resistance value (or capacitance) after the resistance value (or capacitance) or multiple resistance (or capacitor) series and parallel of resistance (or capacitor).
The embodiment of the invention also discloses a kind of electronic equipment, which may include that Fig. 1 to Fig. 6 is shown respectively
Under-voltage protecting circuit 10, under-voltage protecting circuit 20, under-voltage protecting circuit 30 and under-voltage protecting circuit 40.In specific implementation, institute
Electronic equipment is stated with input port and output port；For example, the electronic equipment can be motor, but not limited to this, also
It can be other electronic equipments appropriate.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (11)
1. a kind of under-voltage protecting circuit characterized by comprising
Undervoltage detection circuit couples input port to receive input voltage, the first pressure stabilizing is in series in the undervoltage detection circuit
Pipe, the breakdown voltage of first voltage-stabiliser tube is greater than in response to the input voltage, and the output end of the undervoltage detection circuit produces
Raw first conducting voltage, first conducting voltage are associated with the input voltage and breakdown voltage；
Voltage transmission circuit is respectively coupled to the input port and output port, and control terminal accesses first conducting voltage,
It is greater than the first preset value in response to first conducting voltage, input port described in the voltage transmission circuit control is to described defeated
Access conducting between exit port is less than or equal to first preset value in response to first conducting voltage, and the voltage passes
Input port described in defeated circuit control to the access between the output port turns off.
2. under-voltage protecting circuit according to claim 1, which is characterized in that the voltage transmission circuit includes:
First switch circuit, control terminal access first conducting voltage, are greater than in response to first conducting voltage described
First preset value, the first switch circuit conducting are less than with generating the second conducting voltage in response to first conducting voltage
Equal to first preset value, the first switch circuit shutdown；
Second switch circuit, control terminal access second conducting voltage, the first end coupling input port, second
End couples the output port, in response to second conducting voltage, the second switch circuit conducting.
3. under-voltage protecting circuit according to claim 2, which is characterized in that the first switch circuit includes:
First switch tube, control terminal access first conducting voltage, and first end ground connection, second end is directly or indirectly
Ground exports second conducting voltage.
4. under-voltage protecting circuit according to claim 3, which is characterized in that the first switch circuit further include:
First potential-divider network, first end connect the input port, and second end connects the second end of the first switch tube,
The partial pressure output end of first potential-divider network exports second conducting voltage.
5. under-voltage protecting circuit according to claim 3, which is characterized in that the first switch circuit further include:
Capacitor, one end of the capacitor connect the control terminal of the first switch tube, other end ground connection.
6. under-voltage protecting circuit according to claim 3, which is characterized in that the first switch circuit further include:
Second voltage-stabiliser tube, cathode couple the control terminal of the first switch tube, plus earth.
7. under-voltage protecting circuit according to claim 2, which is characterized in that the second switch circuit includes:
Second switch, control terminal directly or indirectly couple the control terminal of the second switch circuit, and described second opens
The first end for closing pipe couples the input port, and the second end of the second switch couples the output port.
8. under-voltage protecting circuit according to claim 7, which is characterized in that the second switch circuit further include:
Third voltage-stabiliser tube, cathode couple the input port, and anode couples the control terminal of the second switch circuit.
9. under-voltage protecting circuit according to any one of claims 1 to 8, which is characterized in that the undervoltage detection circuit is also
Include:
Second potential-divider network is connected with first voltage-stabiliser tube, the partial pressure output end of second potential-divider network output described the
One conducting voltage.
10. under-voltage protecting circuit according to claim 9, which is characterized in that the cathode of first voltage-stabiliser tube connects institute
Input port is stated, the anode of first voltage-stabiliser tube connects the first end of second potential-divider network, second potential-divider network
Second end ground connection.
11. a kind of electronic equipment, which is characterized in that including the described in any item under-voltage protecting circuits of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710445745.2A CN109088393A (en) | 2017-06-13 | 2017-06-13 | Under-voltage protecting circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710445745.2A CN109088393A (en) | 2017-06-13 | 2017-06-13 | Under-voltage protecting circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109088393A true CN109088393A (en) | 2018-12-25 |
Family
ID=64838816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710445745.2A Pending CN109088393A (en) | 2017-06-13 | 2017-06-13 | Under-voltage protecting circuit and electronic equipment |
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| CN (1) | CN109088393A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3736984A1 (en) * | 2019-05-03 | 2020-11-11 | Delta Electronics, Inc. | A driving circuit and an under-voltage lockout circuit of a power circuit |
| CN112436482A (en) * | 2020-11-18 | 2021-03-02 | 潍柴动力股份有限公司 | Undervoltage protection circuit |
| CN112908277A (en) * | 2021-02-03 | 2021-06-04 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
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| US3626278A (en) * | 1969-03-12 | 1971-12-07 | Hitachi Ltd | Collector follower-type transistorized voltage regulator |
| CN203895960U (en) * | 2014-05-27 | 2014-10-22 | 深圳市振华微电子有限公司 | Undervoltage protection circuit |
| CN104242233A (en) * | 2014-09-26 | 2014-12-24 | 深圳市伊爱高新技术开发有限公司 | Overvoltage-undervoltage protecting circuit automatically supporting different power systems |
| CN104821554A (en) * | 2015-05-19 | 2015-08-05 | 中国兵器工业集团第二一四研究所苏州研发中心 | DC/DC power input overvoltage and under-voltage protection device composed of voltage-stabilizing tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3626278A (en) * | 1969-03-12 | 1971-12-07 | Hitachi Ltd | Collector follower-type transistorized voltage regulator |
| CN203895960U (en) * | 2014-05-27 | 2014-10-22 | 深圳市振华微电子有限公司 | Undervoltage protection circuit |
| CN104242233A (en) * | 2014-09-26 | 2014-12-24 | 深圳市伊爱高新技术开发有限公司 | Overvoltage-undervoltage protecting circuit automatically supporting different power systems |
| CN104821554A (en) * | 2015-05-19 | 2015-08-05 | 中国兵器工业集团第二一四研究所苏州研发中心 | DC/DC power input overvoltage and under-voltage protection device composed of voltage-stabilizing tube |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3736984A1 (en) * | 2019-05-03 | 2020-11-11 | Delta Electronics, Inc. | A driving circuit and an under-voltage lockout circuit of a power circuit |
| CN112436482A (en) * | 2020-11-18 | 2021-03-02 | 潍柴动力股份有限公司 | Undervoltage protection circuit |
| CN112908277A (en) * | 2021-02-03 | 2021-06-04 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
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Address after: No.65-1 Xinggang Road, Zhonglou Economic Development Zone, Changzhou City, Jiangsu Province Applicant after: Gelibo (Jiangsu) Co., Ltd Address before: 213023 Jiangsu province Changzhou Xingang Tower Road Economic Development Zone No. 65 Applicant before: CHANGZHOU GLOBE Co.,Ltd. |
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Application publication date: 20181225 |