CN207939194U - A kind of overvoltage crowbar - Google Patents
A kind of overvoltage crowbar Download PDFInfo
- Publication number
- CN207939194U CN207939194U CN201820457028.1U CN201820457028U CN207939194U CN 207939194 U CN207939194 U CN 207939194U CN 201820457028 U CN201820457028 U CN 201820457028U CN 207939194 U CN207939194 U CN 207939194U
- Authority
- CN
- China
- Prior art keywords
- voltage
- unit
- level
- master control
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model discloses a kind of overvoltage crowbar, which includes peak value sampling unit, partial pressure unit, threshold setting unit, drop-down unit of powering；Peak value sampling unit obtains high voltage direct current level for carrying out peak value sampling to rectification bridge output end voltage；Partial pressure unit obtains low-voltage DC level for carrying out voltage division processing to high voltage direct current level；Threshold setting unit, for setting the voltage stabilizing value needed for master control IC；Power supply drop-down unit, for according to the comparison between low-voltage DC level and voltage stabilizing value, determine the working condition of master control IC, when low-voltage DC level is more than the voltage stabilizing value of setting, drop-down unit of powering conducting, master control IC are stopped, when low-voltage DC level is less than voltage stabilizing value, drop-down unit of powering shutdown, master control IC normal works.The utility model have it is at low cost, be not necessarily to externally fed, circuit energy consumption is small, the high advantage of stability.
Description
Technical field
The utility model is related to a kind of power supply, more specifically a kind of overvoltage crowbar.
Background technology
In Switching Power Supply application, in the unstable area of some input power grids, input ac voltage is it is possible that very
Big fluctuation, when input voltage height to a certain extent when, it is likely that power supply is damaged, the power supply applied under these scenes is usual
Additional design communication overvoltage crowbar is needed, prevents power supply from damaging.Existing protection circuit against input over-voltage has following two
Scheme, the first overvoltage crowbar, referring to Fig. 1, overvoltage crowbar is by voltage detecting circuit, overvoltage protection IC, current limliting
A few part compositions of resistance, switching tube, detect the voltage after rectification by over-voltage detection circuit and carry out voltage division processing, treated
Signal is supplied to dedicated overvoltage protection IC, the on-off switching tube when voltage is higher, to cut off main power circuit.Second of mistake
Voltage protection circuit, referring to Fig. 2, overvoltage crowbar is by voltage detection unit, comparator, current-limiting resistance, several parts of relay
Composition, the voltage after over-pressed detection unit detection rectification are compared with comparator, if input voltage is excessively high, control relay
Device is threaded off, and main loop of power circuit is cut off.
The higher device of some costs is used in two kinds of above-mentioned prior arts, such as the first overvoltage protection electricity
Overvoltage protection IC, the high-pressure MOS switching tube on road, the comparator, relay cost in second of overvoltage crowbar are higher, unfavorable
In the control of power supply totle drilling cost.In addition overvoltage protection IC and comparator are both needed to externally fed, need additional designs power supply circuit, electricity
More complicated in the design of road, switching tube and relay size are larger, increase difficulty in power supply architecture design.
In addition, in order to reduce the impact of booting moment input current switch tube and relay, it usually needs in switching tube
With relay front end series limiting resistor, to reduce dash current, the current-limiting resistance in the first overvoltage crowbar and switch
Current-limiting resistance in pipe and the first overvoltage crowbar is connected in main circuit always in normal work, and energy consumption is larger,
It is reduced so as to cause the working efficiency of power supply, simultaneously because energy consumption is larger, generated fever can influence the reliability of circuit.
Therefore, it is necessary to design a kind of at low cost, it is not necessarily to externally fed, the high overvoltage crowbar of reliability.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of overvoltage crowbar.
To achieve the above object, the utility model uses following technical scheme：A kind of overvoltage crowbar, including peak value are adopted
Sample unit, partial pressure unit, threshold setting unit, drop-down unit of powering；Wherein, peak value sampling unit, for being exported to rectifier bridge
Terminal voltage carries out peak value sampling, obtains high voltage direct current level；The partial pressure unit, for being carried out at partial pressure to high voltage direct current level
Reason, obtains low-voltage DC level；The threshold setting unit, for setting the voltage stabilizing value needed for master control IC；The power supply drop-down
Unit, for according to the comparison between low-voltage DC level and voltage stabilizing value, determining the working condition of master control IC, working as low-voltage DC
When the flat voltage stabilizing value for being more than setting, power supply drop-down unit conducting, master control IC is stopped, when low-voltage DC level is less than voltage stabilizing value
When, power supply drop-down unit shutdown, master control IC normal works.
Its further technical solution is：The peak value sampling unit includes diode D7 and capacitance C101.
Its further technical solution is：The capacitance C101 is epitaxial capacitance.
Its further technical solution is：The partial pressure unit includes resistance R6, resistance R7, resistance R101, resistance R102 and
Capacitance C102.
Its further technical solution is：The threshold setting unit includes capacitance C103, resistance R103 and voltage-stabiliser tube ZD11.
Its further technical solution is：The power supply drop-down unit includes switching tube Q6 and diode D6.
The advantageous effect of the utility model compared with prior art is：A kind of overvoltage crowbar of the utility model, passes through
Peak value sampling unit, partial pressure unit, threshold setting unit, drop-down unit of powering, using peak value sampling unit to rectifier bridge are set
Output end voltage carries out peak value sampling, obtains high voltage direct current level, and voltage division processing is carried out to high voltage direct current level by partial pressure unit,
Low-voltage DC level is obtained, voltage stabilizing value is set using threshold setting unit further according to the demand of master control IC, finally power supply drop-down is single
Member determines the working condition of master control IC, entire circuit cost is low, is not necessarily to according to the comparison between low-voltage DC level and voltage stabilizing value
Externally fed, circuit energy consumption is small, and stability is high.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the utility model technology
Means can be implemented in accordance with the contents of the specification, and in order to allow above and other purpose of the utility model, feature and excellent
Point can be clearer and more comprehensible, and special below to lift preferred embodiment, detailed description are as follows.
Description of the drawings
Fig. 1 is the circuit diagram of the first overvoltage crowbar in the prior art；
Fig. 2 is the circuit diagram of second of overvoltage crowbar in the prior art；
Fig. 3 is a kind of structure diagram of overvoltage crowbar specific embodiment of the utility model；
Fig. 4 is a kind of circuit diagram of overvoltage crowbar specific embodiment of the utility model.
Specific implementation mode
In order to more fully understand the technology contents of the utility model, with reference to specific embodiment to the skill of the utility model
Art scheme is further described and illustrates, but not limited to this.
Please refer to Fig. 3,4, a kind of overvoltage crowbar of the utility model, including peak value sampling unit 2, partial pressure unit 3, threshold
It is worth setup unit 4, drop-down unit 5 of powering；Wherein, peak value sampling unit 2 is adopted for carrying out peak value to rectification bridge output end voltage
Sample obtains high voltage direct current level；Partial pressure unit 3 obtains low-voltage DC for carrying out voltage division processing to high voltage direct current level
It is flat；Threshold setting unit 4, for setting the voltage stabilizing value needed for master control IC6 (size of voltage stabilizing value can be set according to actual conditions)；
Power supply drop-down unit 5, for according to the comparison between low-voltage DC level and voltage stabilizing value, determining the working condition of master control IC6, when
When low-voltage DC level is more than the voltage stabilizing value of setting, power supply drop-down unit 5 is connected, and master control IC6 is stopped, and works as low-voltage DC
When putting down less than voltage stabilizing value, power supply drop-down unit 5 turns off, master control IC6 normal works.
Further, peak value sampling unit 2 includes diode D7 and capacitance C101.Preferably, capacitance C101 is epitaxial electricity
Hold.Peak value sampling unit 2 is sampled to the input voltage 1 after being arranged by rectifier circuit, the anode of diode D7
It is connect with the output end of rectifier bridge single channel, cathode and the capacitance C101, capacitance C101 and diode D7 of diode D7 are concatenated
Connection relation.Wherein, the stagnant ring that peak value uses unit that can adjust overvoltage crowbar by the selection of capacitance C101 capacity is big
It is small.
Further, partial pressure unit 3 includes resistance R6, resistance R7, resistance R101, resistance R102 and capacitance C102.Specifically
, resistance R6, resistance R7, resistance R101, resistance R102 are sequentially connected in series, resistance R6, resistance R7, resistance R101, and resistance R102 is whole
Body is in parallel with capacitance C101, and capacitance C102 is parallel to the both ends of resistance R101, resistance R102.Partial pressure unit 3 passes through resistance R6, electricity
R7 is hindered, resistance R101, the calculation formula that low-voltage DC level Vx, Vx is adjusted in resistance R102 matchings is Vx=√ 2Vin (R101+
R102)/(R6+R7+R101+R102)。
Further, threshold setting unit 4 includes capacitance C103, resistance R103 and voltage-stabiliser tube ZD11.Wherein, resistance R103
In parallel with capacitance C103, resistance R103, capacitance C103 integrally connect with voltage-stabiliser tube ZD11, capacitance C103, resistance R103, voltage-stabiliser tube
ZD11 is whole in parallel with capacitance C102.Further, power supply drop-down unit 5 includes switching tube Q6 and diode D6.Wherein, it switchs
The grid of pipe Q6 is connected with voltage-stabiliser tube ZD11, the source electrode ground connection of switching tube Q6, the moon of the drain electrode and diode D6 of switching tube Q6
Pole connects, and the anode of diode D6 is connected with master control IC6 and load.Low-voltage DC level Vx and voltage stabilizing value (in the present embodiment, threshold
The voltage stabilizing value that value setup unit 4 is set is 15V) it is compared, work as Vx>When 15V, switching tube Q6 conductings, the pin of master control IC6
VDD is pulled down to low level, and master control IC6 is stopped, and stops power supply output, works as Vx<When 15V, switching tube Q6 is disconnected, master control
IC6 is worked normally, and power supply normally exports.
In summary：A kind of overvoltage crowbar of the utility model, by be arranged peak value sampling unit 2, partial pressure unit 3,
Threshold setting unit 4, drop-down unit 5 of powering carry out peak value sampling using peak value sampling unit 2 to rectification bridge output end voltage,
High voltage direct current level is obtained, voltage division processing is carried out to high voltage direct current level by partial pressure unit 3, obtains low-voltage DC level, then root
Voltage stabilizing value is set using threshold setting unit 4 according to the demand of master control IC6, drop-down unit 5 of finally powering is according to low-voltage DC level
With the comparison between voltage stabilizing value, the working condition of master control IC6 is determined, entire circuit cost is low, is not necessarily to externally fed, circuit energy consumption
Small, stability is high.
In addition, when utility model works, using following step, which includes：
Peak value sampling is carried out to rectification bridge output end voltage, obtains high voltage direct current level；
Voltage division processing is carried out to high voltage direct current level, obtains low-voltage DC level；
Set the voltage stabilizing value needed for master control IC6；
According to the comparison between low-voltage DC level and voltage stabilizing value, determines the working condition of master control IC6, work as low-voltage DC
When the flat voltage stabilizing value for being more than setting, power supply drop-down unit 5 is connected, and master control IC6 is stopped, when low-voltage DC level is less than voltage stabilizing
When value, power supply drop-down unit 5 turns off, master control IC6 normal works.
Specifically, carrying out peak value sampling to rectification bridge output end voltage by peak value sampling unit 2, high voltage direct current is obtained
It is flat；Voltage division processing is carried out to high voltage direct current level by partial pressure unit 3, obtains low-voltage DC level；Pass through threshold setting unit 4
Set the voltage stabilizing value needed for master control IC6 (size of voltage stabilizing value can be set according to actual conditions)；Pass through 5 basis of drop-down unit of powering
Comparison between low-voltage DC level and voltage stabilizing value determines the working condition of master control IC6, when low-voltage DC level is more than setting
When voltage stabilizing value, power supply drop-down unit 5 is connected, and master control IC6 is stopped, when low-voltage DC level is less than voltage stabilizing value, under power supply
Unit 5 is drawn to turn off, master control IC6 normal works.
Further, peak value sampling unit 2 includes diode D7 and capacitance C101.Preferably, capacitance C101 is epitaxial electricity
Hold.Peak value sampling unit 2 is sampled to the input voltage 1 after being arranged by rectifier circuit, the anode of diode D7
It is connect with the output end of rectifier bridge single channel, cathode and the capacitance C101, capacitance C101 and diode D7 of diode D7 are concatenated
Connection relation.Wherein, the stagnant ring that peak value uses unit that can adjust overvoltage crowbar by the selection of capacitance C101 capacity is big
It is small.
Further, partial pressure unit 3 includes resistance R6, resistance R7, resistance R101, resistance R102 and capacitance C102.Specifically
, resistance R6, resistance R7, resistance R101, resistance R102 are sequentially connected in series, resistance R6, resistance R7, resistance R101, and resistance R102 is whole
Body is in parallel with capacitance C101, and capacitance C102 is parallel to the both ends of resistance R101, resistance R102.Partial pressure unit 3 passes through resistance R6, electricity
R7 is hindered, resistance R101, the calculation formula that low-voltage DC level Vx, Vx is adjusted in resistance R102 matchings is Vx=√ 2Vin (R101+
R102)/(R6+R7+R101+R102)。
Further, threshold setting unit 4 includes capacitance C103, resistance R103 and voltage-stabiliser tube ZD11.Wherein, resistance R103
In parallel with capacitance C103, resistance R103, capacitance C103 integrally connect with voltage-stabiliser tube ZD11, capacitance C103, resistance R103, voltage-stabiliser tube
ZD11 is whole in parallel with capacitance C102.Further, power supply drop-down unit 5 includes switching tube Q6 and diode D6.Wherein, it switchs
The grid of pipe Q6 is connected with voltage-stabiliser tube ZD11, the source electrode ground connection of switching tube Q6, the moon of the drain electrode and diode D6 of switching tube Q6
Pole connects, and the anode of diode D6 is connected with master control IC6 and load.Low-voltage DC level Vx and voltage stabilizing value (in the present embodiment, threshold
The voltage stabilizing value that value setup unit 4 is set is 15V) it is compared, work as Vx>When 15V, switching tube Q6 conductings, the pin of master control IC6
VDD is pulled down to low level, and master control IC6 is stopped, and stops power supply output, works as Vx<When 15V, switching tube Q6 is disconnected, master control
IC6 is worked normally, and power supply normally exports.
In summary, the step of being used when utility model works is adopted by carrying out peak value to rectification bridge output end voltage
Sample obtains high voltage direct current level, then carries out voltage division processing to high voltage direct current level, low-voltage DC level is obtained, according to master control IC6
Demand setting voltage stabilizing value determine the work shape of master control IC6 finally by the comparison between low-voltage DC level and voltage stabilizing value
State, entire circuit cost is low, is not necessarily to externally fed, and circuit energy consumption is small, and stability is high.
The above-mentioned technology contents that the utility model is only further illustrated with embodiment, in order to which reader is easier to understand,
But the embodiment for not representing the utility model is only limitted to this, and any technology done according to the utility model extends or recreation,
Protected by the utility model.The scope of protection of the utility model is subject to claims.
Claims (6)
1. a kind of overvoltage crowbar, which is characterized in that including peak value sampling unit, partial pressure unit, threshold setting unit, power supply
Drop-down unit；Wherein, peak value sampling unit obtains high voltage direct current for carrying out peak value sampling to rectification bridge output end voltage
It is flat；The partial pressure unit obtains low-voltage DC level for carrying out voltage division processing to high voltage direct current level；The threshold value setting
Unit, for setting the voltage stabilizing value needed for master control IC；The power supply drop-down unit, for according to low-voltage DC level and voltage stabilizing value
Between comparison, determine the working condition of master control IC, when low-voltage DC level be more than setting voltage stabilizing value when, power drop-down unit
Conducting, master control IC are stopped, when low-voltage DC level is less than voltage stabilizing value, power supply drop-down unit shutdown, and the normal works of master control IC
Make.
2. a kind of overvoltage crowbar according to claim 1, which is characterized in that the peak value sampling unit includes two poles
Pipe D7 and capacitance C101.
3. a kind of overvoltage crowbar according to claim 2, which is characterized in that the capacitance C101 is epitaxial capacitance.
4. a kind of overvoltage crowbar according to claim 1, which is characterized in that the partial pressure unit includes resistance R6,
Resistance R7, resistance R101, resistance R102 and capacitance C102.
5. a kind of overvoltage crowbar according to claim 1, which is characterized in that the threshold setting unit includes capacitance
C103, resistance R103 and voltage-stabiliser tube ZD11.
6. a kind of overvoltage crowbar according to claim 1, which is characterized in that the power supply drop-down unit includes switch
Pipe Q6 and diode D6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820457028.1U CN207939194U (en) | 2018-04-03 | 2018-04-03 | A kind of overvoltage crowbar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820457028.1U CN207939194U (en) | 2018-04-03 | 2018-04-03 | A kind of overvoltage crowbar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207939194U true CN207939194U (en) | 2018-10-02 |
Family
ID=63656346
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820457028.1U Active CN207939194U (en) | 2018-04-03 | 2018-04-03 | A kind of overvoltage crowbar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207939194U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448538A (en) * | 2018-04-03 | 2018-08-24 | 深圳茂硕电子科技有限公司 | A kind of overvoltage crowbar and its method |
-
2018
- 2018-04-03 CN CN201820457028.1U patent/CN207939194U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108448538A (en) * | 2018-04-03 | 2018-08-24 | 深圳茂硕电子科技有限公司 | A kind of overvoltage crowbar and its method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104577993B (en) | Switching Power Supply input voltage protection circuit | |
| CN109638786B (en) | Photovoltaic module turn-off protection circuit and module turn-off device | |
| CN105703614A (en) | Anti-reverse-connection and anti-backward-flow protective circuit | |
| CN203205845U (en) | Battery protection circuit with post-discharge overcurrent protection self-recovery function | |
| CN202384752U (en) | Switching power supply overcurrent protection circuit | |
| CN103457232A (en) | Short-circuit protection circuit of direct-current load and illuminator | |
| CN107294058A (en) | A kind of overvoltage undervoltage detection circuit applied to solar energy power accumulating power supply | |
| CN106443502B (en) | The current detecting and protection circuit of a kind of high-precision power floating ground port | |
| CN108448538A (en) | A kind of overvoltage crowbar and its method | |
| CN104218558B (en) | Anti-surging high tension protection circuit | |
| CN203367965U (en) | High voltage arc extinction timing control circuit | |
| CN105048422B (en) | Switching transistor pressure drop holding circuit and application have the lithium battery protection circuit of the pressure drop holding circuit | |
| CN207939194U (en) | A kind of overvoltage crowbar | |
| CN101771338B (en) | Switching power supply module with high reliability and low power consumption | |
| CN107294199A (en) | A kind of compound voltage detecting switching circuit of logic | |
| CN208753976U (en) | A kind of under-voltage protecting circuit with lag function | |
| CN203553906U (en) | Protection circuit for input voltage of switch power supply | |
| CN209282877U (en) | A kind of battery discharge control circuit | |
| CN206727643U (en) | A kind of under-voltage and overvoltage crowbar | |
| CN102857177B (en) | Control and protection circuit for solid-state microwave power amplifier | |
| CN109474045A (en) | A kind of battery discharge control circuit | |
| CN109613326A (en) | A kind of input over-voltage detection circuit that can work independently and its implementation | |
| CN211744440U (en) | Slow output switch circuit | |
| CN203339686U (en) | Constant current source short circuit protection inhibition circuit | |
| CN209267544U (en) | The driving of IGBT a kind of and protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |