CN104882849B - Electrical equipment and its low pressure shutdown circuit - Google Patents
Electrical equipment and its low pressure shutdown circuit Download PDFInfo
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- CN104882849B CN104882849B CN201410073784.0A CN201410073784A CN104882849B CN 104882849 B CN104882849 B CN 104882849B CN 201410073784 A CN201410073784 A CN 201410073784A CN 104882849 B CN104882849 B CN 104882849B
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Abstract
The invention discloses a kind of electrical equipment and its low pressure shutdown circuits, wherein the low pressure shutdown circuit of electrical equipment includes: supply voltage test side, is connected with the power supply of electrical equipment；The voltage of first reference voltage module, the power supply for being detected according to supply voltage test side generates the first reference voltage；The voltage of second reference voltage module, the power supply for being detected according to supply voltage test side generates the second reference voltage；Comparison module, it is connected respectively with the first reference voltage module and the second reference voltage module, for comparison module for being compared to the first reference voltage and the second reference voltage, and when the second reference voltage is less than the first reference voltage, comparison module generates control signal to cut off the power supply of electrical equipment.Electrical equipment and its low pressure shutdown circuit of the invention can the power supply of electrical equipment voltage it is low to preset threshold when, the accurate power supply for cutting off electrical equipment, structure is simple, high reliablity, and low manufacture cost.
Description
Technical field
The present invention relates to electronic technology field, in particular to the low pressure shutdown circuit of a kind of electrical equipment and a kind of electricity consumption are set
It is standby.
Background technique
Currently, it is designed with the backup power source constituted with charge storage element mostly in electronic instrument and equipment, it is urgent to cope with
Situation for example powers off.
In the related technology, when the voltage of backup power source it is low to preset threshold when, in order to protect charge storage element not because
Overdischarge and damage, the voltage of backup power source is usually monitored by low pressure shutdown circuit, and in the voltage of backup power source
It shuts down when low.
But low pressure shutdown circuit in the related technology designs complexity mostly, cost of manufacture is higher.Therefore, the relevant technologies
In low pressure shutdown circuit there are improved necessity.
Summary of the invention
The present invention is directed to solve above-mentioned one of technical problem at least to a certain extent.
For this purpose, an object of the present invention is to provide a kind of low pressure shutdown circuit of electrical equipment, the electrical equipment
Low pressure shutdown circuit structure is simple, low manufacture cost.
It is another object of the present invention to propose a kind of electrical equipment.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of low pressure shutdown circuit of electrical equipment, should
The low pressure shutdown circuit of electrical equipment includes: supply voltage test side, the supply voltage test side and the electrical equipment
Power supply is connected；First reference voltage module, first reference voltage module are connected with the supply voltage test side, and described
The voltage for the power supply that one reference voltage module is used to be detected according to the supply voltage test side generates first with reference to electricity
Pressure；Second reference voltage module, second reference voltage module are connected with the supply voltage test side, second reference
The voltage for the power supply that voltage module is used to be detected according to the supply voltage test side generates the second reference voltage；With than
Compared with module, the comparison module is connected with first reference voltage module and second reference voltage module respectively, described
Comparison module works as second reference voltage for being compared to first reference voltage and second reference voltage
When less than first reference voltage, the comparison module generates control signal to cut off the power supply of the electrical equipment.
The low pressure shutdown circuit of the electrical equipment of the embodiment of the present invention generates first with reference to electricity in the first reference voltage module
After pressure and the second reference voltage module generate the second reference voltage, by comparing module to the first reference voltage and second with reference to electricity
Pressure is compared, and when the second reference voltage is less than the first reference voltage, and comparison module generates control signal to cut off electricity consumption
The power supply of equipment.The low pressure shutdown circuit of the electrical equipment can electrical equipment supply voltage it is low to a certain extent when,
The power supply of accurate cutting electrical equipment, structure is simple, low manufacture cost.
Further, in one embodiment of the invention, the first reference voltage module includes: first resistor, and described
One end of one resistance is connected with the supply voltage test side；Voltage-reference, the cathode of the voltage-reference and described the
The other end of one resistance is connected, the plus earth of the voltage-reference, the cathode of the voltage-reference and first electricity
There is first node, the voltage of the first node is first reference voltage between the other end of resistance；And first capacitor, institute
It is in parallel with the voltage-reference to state first capacitor.
Further, in one embodiment of the invention, the second reference voltage module includes: second resistance, and described
One end of two resistance is connected with the supply voltage test side；3rd resistor, one end of the 3rd resistor and second electricity
The other end of resistance is connected, the other end ground connection of the 3rd resistor, and one end of the 3rd resistor is another with the second resistance
There is second node, the voltage of the second node is second reference voltage between one end；With the second capacitor, described second
Capacitor is in parallel with the 3rd resistor.
Further, in one embodiment of the invention, the low pressure shutdown circuit of the electrical equipment further include: two poles
Pipe, the anode of the diode are connected with the first node, and the cathode of the diode is connected with the second node.
Further, in one embodiment of the invention, the comparison module includes: first comparator, and described first
The in-phase end of comparator is connected with the second node, and the reverse side of the first comparator is connected with the first node, institute
The output end for stating first comparator is connected with the second node；Second comparator, the reverse side of second comparator and institute
It states second node to be connected, the in-phase end of second comparator is connected with the first node, the power supply of second comparator
End is connected with the supply voltage test side, the ground terminal ground connection of second comparator.
Further, in one embodiment of the invention, the low pressure shutdown circuit of the electrical equipment further include: the 4th
One end of resistance, the 4th resistance is connected with the supply voltage test side, the other end of the 4th resistance and described the
The output end of two comparators is connected.
Further, in one embodiment of the invention, the voltage-reference is parallel connection type band gap voltage reference source.
In order to achieve the above objectives, another aspect of the present invention embodiment also proposed a kind of electrical equipment, the electrical equipment packet
Include the low pressure shutdown circuit of the electrical equipment.
The electrical equipment of the embodiment of the present invention cuts off the power supply of electrical equipment by the low pressure shutdown circuit of electrical equipment.
The electrical equipment can electrical equipment supply voltage it is low to a certain extent when, the accurate power supply for cutting off electrical equipment,
Structure is simple, low manufacture cost.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect and advantage of the invention will become from the following description of the accompanying drawings of embodiments
Obviously and it is readily appreciated that, in which:
Fig. 1 is the circuit diagram according to the low pressure shutdown circuit of the electrical equipment of the embodiment of the present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not construed as limiting the claims.
Following disclosure provides many different embodiments or example is used to realize different structure of the invention.For letter
Change disclosure of the invention, hereinafter the component of specific examples and setting are described.Certainly, they are merely examples, and
It is not intended to limit the present invention.In addition, the present invention can in different examples repeat reference numerals and/or letter.It is this heavy
It is for purposes of simplicity and clarity, itself not indicate the relationship between discussed various embodiments and/or setting again.This
Outside, the present invention provides various specific techniques and material example, but those of ordinary skill in the art may be aware that
The applicable property of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it
The structure of "upper" may include the embodiment that the first and second features are formed as directly contacting, and also may include other feature shape
At the embodiment between the first and second features, such first and second feature may not be direct contact.
In the description of the present invention, it should be noted that unless otherwise specified and limited, term " installation ", " connected ",
" connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, the connection being also possible to inside two elements can
, can also indirectly connected through an intermediary, for the ordinary skill in the art to be to be connected directly, it can basis
Concrete condition understands the concrete meaning of above-mentioned term.
It describes the low pressure shutdown circuit of the electrical equipment proposed according to embodiments of the present invention with reference to the accompanying drawings and has
Its electrical equipment.
As shown in Figure 1, the low pressure shutdown circuit of the electrical equipment of the embodiment of the present invention include: supply voltage test side 10,
First reference voltage module 20, the second reference voltage module 30 and comparison module 40.Wherein, supply voltage test side 10 and electricity consumption
The power supply of equipment is connected.First reference voltage module 20 is connected with supply voltage test side 10, and the first reference voltage module 20 is used
The first reference voltage V1 is generated in the voltage Vin of the power supply detected according to supply voltage test side 10.Second reference voltage mould
Block 30 is connected with supply voltage test side 10, what the second reference voltage module 30 was used to be detected according to supply voltage test side 10
The voltage Vin of power supply generates the second reference voltage V2.Comparison module 40 is referred to the first reference voltage module 20 and second respectively
Voltage module 30 is connected, and comparison module 40 is for being compared the first reference voltage V1 and the second reference voltage V2, and when the
When two reference voltage V2 are less than the first reference voltage V1, comparison module 40 generates control signal to cut off the power supply of electrical equipment.
Specifically, in one embodiment of the invention, the first reference voltage module 20 may include: first resistor R1,
Voltage-reference U1 and first capacitor C1.Wherein, one end of first resistor R1 is connected with supply voltage test side 10.Voltage reference
The cathode of source U1 is connected with the other end of first resistor R1, the plus earth of voltage-reference U1, the cathode of voltage-reference U1
There is first node J1 between the other end of first resistor R1, the voltage of first node J1 is the first reference voltage V1.First
Capacitor C1 is in parallel with voltage-reference U1.Further, in one embodiment of the invention, when electrical equipment works, electricity
The voltage Vin for the power supply that source voltage detection terminal 10 detects through first resistor R1 output services electric current to voltage-reference U1, into
And voltage-reference U1 generates the first stable reference voltage V1.Wherein, the value of first resistor R1 can satisfy following calculating
Formula:
(Vin-V1)/R1>=Min_I1
Wherein, Min_I1 is the minimum working current of voltage-reference U1.Specifically, in one embodiment of the present of invention
In, voltage-reference U1 can be parallel connection type band gap voltage reference source such as LM285-2.5, also, when voltage-reference U1 is
When LM285-2.5, the first reference voltage V1 that voltage-reference U1 is generated is 2.5V.
Specifically, in one embodiment of the invention, the second reference voltage module 30 may include: second resistance R2,
3rd resistor R3 and the second capacitor C2.Wherein, one end of second resistance R2 is connected with supply voltage test side 10.3rd resistor R3
One end be connected with the other end of second resistance R2, the other end of 3rd resistor R3 ground connection, one end of 3rd resistor R3 and second
There is second node J2, the voltage of second node J2 is the second reference voltage V2 between the other end of resistance R2.Second capacitor C2
It is in parallel with 3rd resistor R3.
It should be noted that ensure that the low pressure shutdown circuit of electrical equipment as shown in Figure 1 can be realized accurately
The supply voltage of electrical equipment it is low to a certain extent when, cut off the power supply of electrical equipment, the setting of each component values can in Fig. 1
To meet the following conditions: the value of first capacitor C1 and the second capacitor C2 ensure that the climbing of the second reference voltage V2 is greater than first
The climbing of reference voltage V1.The second reference voltage V2 after the partial pressure of second resistance R2 and 3rd resistor R3 is greater than the first reference
Voltage V1.Furthermore it is possible to which the voltage for the power supply that comparison module 40 generates when controlling signal is arranged are as follows:
Vin_d=V1*(R2+R3)/R3
In other words, Vin_d is the voltage value of power supply when comparison module 40 generates control signal.
Further, in one embodiment of the invention, the low pressure shutdown circuit of electrical equipment can also include: two poles
The anode of pipe D1, diode D1 are connected with first node J1, and the cathode of diode D1 is connected with second node J2.
Specifically, in one embodiment of the invention, comparison module 40 may include: first comparator U1A for example
LM393 and the second comparator U1B such as LM393.Wherein, the in-phase end of first comparator U1A is connected with second node J2, and first
The reverse side of comparator U1A is connected with first node J1, and the output end of first comparator U1A is connected with second node J2.Second
The reverse side of comparator U1B is connected with second node J2, and the in-phase end of the second comparator U1B is connected with first node J1, and second
The power end of comparator U1B is connected with supply voltage test side 10, the ground terminal ground connection of the second comparator U1B.It should be noted that
In one embodiment of the invention, the output end of the second comparator U1B can be used as the power supply shutdown control terminal of electrical equipment.
Specifically, in one embodiment of the invention, when electrical equipment is started to work, the voltage Vin of power supply is greater than
Vin_d, at this point, reverse side voltage of the second reference voltage V2 greater than the first reference voltage V1, the second comparator U1B is higher than second
The output voltage of the in-phase end voltage of comparator U1B, the second comparator U1B is low level, which can be used for controlling it
The power source control element of its diversified forms, so that electric energy is saved, it is more environmentally-friendly.In addition, the in-phase end voltage of first comparator U1A
The output of reverse side voltage higher than first comparator U1A, first comparator U1A is open collector, will not affect that second
The size of reference voltage V2.In addition, diode D1 is in reverse blocking state.At this point, the electrical equipment of the embodiment of the present invention
Low pressure shutdown circuit is in booting stable state.
Specifically, in another embodiment of the present invention, electrical equipment after a period of work, due to disappearing for electric energy
Consumption, the voltage Vin of power supply will be slow decline, when the voltage Vin of power supply drops to Vin_d and/or Vin_d or less, the second ginseng
Examine the in-phase end that reverse side voltage of the voltage V2 less than the first reference voltage V1, the second comparator U1B is lower than the second comparator U1B
The output of voltage, the second comparator U1B is open collector, to cut off the power supply of electrical equipment.In addition, first comparator
The in-phase end voltage of U1A is lower than the reverse side voltage of first comparator U1A, and first comparator U1A overturns and exports low level, makes
The second reference voltage V2 is obtained close to 0V, so that it is guaranteed that after the power supply of cutting electrical equipment, it will not be due to the voltage Vin of power supply
Go up and be again started up electrical equipment, shutdown is accurate reliable.In addition, diode D1 and first capacitor C1 constitutes discharge loop, it should
Discharge loop discharges to first capacitor C1, so that starting next time for electrical equipment is ready.
Further, in one embodiment of the invention, the low pressure shutdown circuit of electrical equipment can also include: the 4th
Resistance R4, one end of the 4th resistance R4 are connected with supply voltage test side 10, the other end and the second comparator of the 4th resistance R4
The output end of U1B is connected.
The low pressure shutdown circuit of the electrical equipment of the embodiment of the present invention generates first with reference to electricity in the first reference voltage module
After pressure and the second reference voltage module generate the second reference voltage, by comparing module to the first reference voltage and second with reference to electricity
Pressure is compared, and when the second reference voltage is less than the first reference voltage, and comparison module generates control signal to cut off use
The power supply of electric equipment.The low pressure shutdown circuit of the electrical equipment can electrical equipment supply voltage it is low to a certain extent
When, the accurate power supply for cutting off electrical equipment, structure is simple, high reliablity, and low manufacture cost.
In order to achieve the above objectives, another aspect of the present invention embodiment also proposed a kind of electrical equipment, the electrical equipment packet
The low pressure shutdown circuit of the electrical equipment included.
The electrical equipment of the embodiment of the present invention cuts off the power supply of electrical equipment by the low pressure shutdown circuit of electrical equipment.
The electrical equipment can electrical equipment supply voltage it is low to a certain extent when, the accurate power supply for cutting off electrical equipment,
Structure is simple, high reliablity, and low manufacture cost.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is by appended claims and its equivalent limits.
Claims (6)
1. a kind of low pressure shutdown circuit of electrical equipment characterized by comprising
Supply voltage test side, the supply voltage test side are connected with the power supply of the electrical equipment；
First reference voltage module, first reference voltage module are connected with the supply voltage test side, first ginseng
The voltage for examining the power supply of the voltage module for detecting according to the supply voltage test side generates the first reference voltage, institute
Stating the first reference voltage module includes:
First resistor, one end of the first resistor are connected with the supply voltage test side；
Voltage-reference, the cathode of the voltage-reference are connected with the other end of the first resistor, the voltage-reference
Plus earth, there is first node between the cathode of the voltage-reference and the other end of the first resistor, described the
The voltage of one node is first reference voltage；With
First capacitor, the first capacitor are in parallel with the voltage-reference；
Second reference voltage module, second reference voltage module are connected with the supply voltage test side, second ginseng
The voltage for examining the power supply of the voltage module for detecting according to the supply voltage test side generates the second reference voltage, institute
Stating the second reference voltage module includes:
Second resistance, one end of the second resistance are connected with the supply voltage test side；
3rd resistor, one end of the 3rd resistor are connected with the other end of the second resistance, the 3rd resistor it is another
End ground connection, has second node, the second node between one end of the 3rd resistor and the other end of the second resistance
Voltage be second reference voltage；With
Second capacitor, second capacitor are in parallel with the 3rd resistor；
Wherein, first capacitor and the value of the second capacitor ensure that the climbing of the second reference voltage is greater than the upper of the first reference voltage
The rate of liter；
Comparison module, the comparison module respectively with first reference voltage module and the second reference voltage module phase
Even, the comparison module is for being compared first reference voltage and second reference voltage, and works as described second
When reference voltage is less than first reference voltage, the comparison module generates control signal to cut off the electricity of the electrical equipment
Source；
Wherein, the voltage of power supply when the comparison module generates control signal are as follows:
Vin_d=V1* (R2+R3)/R3
Wherein, Vin_d is the voltage value of power supply when comparison module generates control signal, and V1 is the first reference voltage, R2 second
The resistance value of resistance, R3 are the resistance value of 3rd resistor.
2. the low pressure shutdown circuit of electrical equipment as described in claim 1, which is characterized in that further include:
Diode, the anode of the diode are connected with the first node, the cathode of the diode and the second node
It is connected.
3. the low pressure shutdown circuit of electrical equipment as claimed in claim 2, which is characterized in that the comparison module includes:
First comparator, the in-phase end of the first comparator are connected with the second node, the reverse phase of the first comparator
End is connected with the first node, and the output end of the first comparator is connected with the second node；
The reverse side of second comparator, second comparator is connected with the second node, the same phase of second comparator
End is connected with the first node, and the power end of second comparator is connected with the supply voltage test side, and described second
The ground terminal of comparator is grounded.
4. the low pressure shutdown circuit of electrical equipment as claimed in claim 3, which is characterized in that further include:
One end of 4th resistance, the 4th resistance is connected with the supply voltage test side, the other end of the 4th resistance
It is connected with the output end of second comparator.
5. the low pressure shutdown circuit of electrical equipment as described in claim 1, which is characterized in that the voltage-reference is parallel connection
Type band gap voltage reference source.
6. a kind of electrical equipment, which is characterized in that the low pressure including electrical equipment according to any one of claims 1 to 5 is closed
Electromechanical road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410073784.0A CN104882849B (en) | 2014-02-28 | 2014-02-28 | Electrical equipment and its low pressure shutdown circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410073784.0A CN104882849B (en) | 2014-02-28 | 2014-02-28 | Electrical equipment and its low pressure shutdown circuit |
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| Publication Number | Publication Date |
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| CN104882849A CN104882849A (en) | 2015-09-02 |
| CN104882849B true CN104882849B (en) | 2019-02-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410073784.0A Active CN104882849B (en) | 2014-02-28 | 2014-02-28 | Electrical equipment and its low pressure shutdown circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107318195A (en) * | 2017-07-17 | 2017-11-03 | 韩超 | The centralized management circuit of emergency light in a kind of embedded illuminator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521475A (en) * | 2009-03-30 | 2009-09-02 | 中国科学院等离子体物理研究所 | High-voltage pulse power source fire-striking counting protection device |
| CN201450311U (en) * | 2009-04-28 | 2010-05-05 | 中山大洋电机股份有限公司 | Temperature control circuit of motor |
| CN203164244U (en) * | 2013-01-18 | 2013-08-28 | 南京民盛电子仪器有限公司 | Primary protective circuit for withstand voltage tester |
| CN103325633A (en) * | 2013-05-08 | 2013-09-25 | 江苏国星电器有限公司 | Electromagnetic type undervoltage release |
| EP3015872A1 (en) * | 2014-10-30 | 2016-05-04 | DET International Holding Limited | Threshold detection circuit |
-
2014
- 2014-02-28 CN CN201410073784.0A patent/CN104882849B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101521475A (en) * | 2009-03-30 | 2009-09-02 | 中国科学院等离子体物理研究所 | High-voltage pulse power source fire-striking counting protection device |
| CN201450311U (en) * | 2009-04-28 | 2010-05-05 | 中山大洋电机股份有限公司 | Temperature control circuit of motor |
| CN203164244U (en) * | 2013-01-18 | 2013-08-28 | 南京民盛电子仪器有限公司 | Primary protective circuit for withstand voltage tester |
| CN103325633A (en) * | 2013-05-08 | 2013-09-25 | 江苏国星电器有限公司 | Electromagnetic type undervoltage release |
| EP3015872A1 (en) * | 2014-10-30 | 2016-05-04 | DET International Holding Limited | Threshold detection circuit |
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| CN104882849A (en) | 2015-09-02 |
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