CN204794034U - Input undervoltage protection circuit - Google Patents
Input undervoltage protection circuit Download PDFInfo
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- CN204794034U CN204794034U CN201520618284.0U CN201520618284U CN204794034U CN 204794034 U CN204794034 U CN 204794034U CN 201520618284 U CN201520618284 U CN 201520618284U CN 204794034 U CN204794034 U CN 204794034U
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Abstract
The utility model provides an input undervoltage protection circuit, includes: rectifier unit circuit, under -voltage element circuit, excessive pressure element circuit, NPN type triode, MOS pipe and pulse driving circuit, NPN type triode, its base end is connected with the output of rectifier unit circuit, and its collector terminal is connected with the grid end of MOS pipe, under -voltage element circuit, its input is connected with the output of rectifier unit circuit, and its output is connected with the base end of NPN type triode, the excessive pressure element circuit, its input is connected with the output of rectifier unit circuit, and its output is connected with the base end of NPN type triode, the MOS pipe, its grid end is connected with the output of rectifier unit circuit, and its drain electrode end is connected with pulse driving circuit. The utility model discloses utilize stabilivolt and triode constitution excessive pressure element circuit and under -voltage element circuit, ensured protection circuit's normal operating to guarantee drive circuit's life, the characteristics of technique are simple structure, and are with low costs, avoid starting in succession and the unable problem that starts.
Description
Technical field
The utility model relates to LED power technical field, especially relates to the one input over under-voltage protection circuit for LED.
Background technology
Drive circuit there will be continuous starting problem or cannot starting problem close to starting when crossing pressure point; pressure point is crossed again much larger than voltage when directly starting after starting; such as AC directly inputs the just protection of 300V power supply; if but power supply was from when being transferred to pressure point again after low-voltage starts, and to cross pressure point much larger than 300V(traditional circuit be 320V)) simultaneously without low pressure under-voltage protection function; when causing brownout, metal-oxide-semiconductor bears excessive peak current, reduces useful life or quick-fried machine.
Utility model content
The purpose of this utility model is to solve the not good problem causing the metal-oxide-semiconductor life-span to decline of protective circuit structure in above-mentioned prior art.
To achieve these goals, the one input over under-voltage protection circuit designed by the utility model, comprising: rectification unit circuit, under-voltage element circuit, overvoltage element circuit, NPN type triode, metal-oxide-semiconductor and pulse driving circuit; Described NPN type triode, its base terminal is connected with the output of described rectification unit circuit, and its collector terminal is connected with the gate terminal of described metal-oxide-semiconductor, its emitter terminal ground connection; Described under-voltage element circuit, its input is connected with the output of described rectification unit circuit, and its output is connected with the base terminal of described NPN type triode; Described overvoltage element circuit, its input is connected with the output of described rectification unit circuit, and its output is connected with the base terminal of described NPN type triode; Described metal-oxide-semiconductor, its gate terminal is connected with the output of described rectification unit circuit, and its drain electrode end is connected with pulse driving circuit, its source terminal ground connection.
Preferably, between described rectification unit circuit and described NPN type triode, be also in series with the first resistance, and with the first electric capacity of described first resistor coupled in parallel.
Preferably, described NPN type triode is the first NPN type triode pipe; Described under-voltage element circuit is at least made up of the first voltage-stabiliser tube and the second NPN type triode; Described first voltage-stabiliser tube, its negative pole end is as the input of described under-voltage element circuit, and its positive terminal is connected with the base terminal of described second NPN type triode; Described second NPN type triode, its collector terminal as the input of described under-voltage element circuit, its emitter terminal ground connection.
Preferably, described overvoltage element circuit is at least made up of the second voltage-stabiliser tube and PNP type triode; Described second voltage-stabiliser tube, its negative pole end is as the input of described overvoltage element circuit, and its positive terminal is connected with the base terminal of described PNP type triode; Described PNP type triode, its emitter connects the output of described overvoltage element circuit, its collector terminal ground connection.
Preferably, described rectification unit circuit is bridge rectifier, and its output connects described metal-oxide-semiconductor, NPN type triode, overvoltage element circuit, under-voltage element circuit by the diode that connects successively, the second resistance, the 3rd resistance; Wherein, described diode just connects.
Preferably, the 4th resistance is in series with between described 3rd resistance and described metal-oxide-semiconductor.
Preferably, the output of described rectification unit circuit is connected with the second electric capacity of ground connection.
Preferably, the negative pole end of described diode is connected with the polar capacitor of ground connection; The positive terminal of described polar capacitor is connected with the negative pole end of described diode, its negative pole end ground connection.
Preferably, one end that described 3rd resistance is connected with described metal-oxide-semiconductor, NPN type triode, overvoltage element circuit, under-voltage element circuit is connected to the 3rd electric capacity of ground connection, and the first pull down resistor.
Preferably, the gate terminal of described metal-oxide-semiconductor is connected to the second pull down resistor.
The one input over under-voltage protection circuit that the utility model obtains; voltage-stabiliser tube and triode is utilized to form overvoltage element circuit and under-voltage element circuit; ensure that the normal operation of protective circuit circuit; and ensure that the useful life of drive circuit; the feature of these technology is that structure is simple; cost is low, avoids the problem starting continuously and cannot start.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of embodiment.
In figure: component names is numbered, rectification unit circuit BD1, under-voltage element circuit ZQ1, overvoltage element circuit ZQ2, the first NPN type triode Q1, metal-oxide-semiconductor Q4, pulse driving circuit PWM, the first resistance R3, the first electric capacity C1, the first voltage-stabiliser tube ZD3, the second NPN type triode Q2, the second voltage-stabiliser tube ZD4, PNP type triode Q3, diode D1, the second resistance R1, the 3rd resistance R2, the 4th resistance R4, the second electric capacity CBB1, polar capacitor EC1, the 3rd electric capacity C2, the first pull down resistor R6, the second pull down resistor R5, GND.
Embodiment
First brief description is carried out to main thought of the present utility model:
AC-DC overvoltage protection (lightning surge) circuit is as Fig. 1, in single-stage PFC circuit, alternating current becomes the steamed bun ripple of 94-120HZ after rectification, often design with lower input voltage for meeting full voltage requirement designer, thus metal-oxide-semiconductor bears larger peak current when causing low pressure, temperature rise raises the work of normal phase may quick-fried machine, minimum input voltage can be set after adding this circuit, when dividing potential drop drives higher than closing during ZD4 lower than ZD3 set point or dividing potential drop, at ZD3, normally work time in ZD4 window ranges, this overvoltage crowbar can prevent because starting continuously close to crossing when pressure point starts compared with traditional overvoltage crowbar when transient state inputs simultaneously, traditional circuit does not connect C1 electric capacity, cause there will be continuous starting problem or cannot starting problem close to starting when crossing pressure point, starting high-frequency signal instantaneously after access C1 electric capacity makes Q1 turning circuit normally start through C1 electric capacity, solve close to circuit continuous problem during mistake pressure point, booster action (thunderbolt is instantaneously because overvoltage is worked) is effectively played when lightning surge.
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Embodiment:
As shown in Figure 1, disclose a kind of input over under-voltage protection circuit, comprising: rectification unit circuit BD1, under-voltage element circuit ZQ1, overvoltage element circuit ZQ2, NPN type triode Q1, metal-oxide-semiconductor Q4 and pulse driving circuit PWM; Described NPN type triode Q1, its base terminal is connected with the output of described rectification unit circuit BD1, and its collector terminal is connected with the gate terminal of described metal-oxide-semiconductor Q4, its emitter terminal ground connection GND; Described under-voltage element circuit ZQ1, its input is connected with the output of described rectification unit circuit BD1, and its output is connected with the base terminal of described NPN type triode Q1; Described overvoltage element circuit ZQ2, its input is connected with the output of described rectification unit circuit BD1, and its output is connected with the base terminal of described NPN type triode Q1; Described metal-oxide-semiconductor Q4, its gate terminal is connected with the output of described rectification unit circuit BD1, and its drain electrode end is connected with pulse driving circuit PWM, its source terminal ground connection GND.
The one input over under-voltage protection circuit that the utility model obtains; voltage-stabiliser tube and triode is utilized to form overvoltage element circuit and under-voltage element circuit; ensure that the normal operation of protective circuit circuit; and ensure that the useful life of drive circuit; the feature of these technology is that structure is simple, and cost is low, avoids the problem starting continuously and cannot start; effectively prevent because the too low MOS of input voltage bears the electric current of too high peak value or the too high maximum voltage exceeding metal-oxide-semiconductor Vds of input voltage.
In some illustrative embodiment, between described rectification unit circuit BD1 and described NPN type triode Q1, be also in series with the first resistance R3, and the first electric capacity C1 in parallel with described first resistance R3.
In some illustrative embodiment, described NPN type triode Q1 is the first NPN type triode pipe; Described under-voltage element circuit ZQ1 is at least made up of the first voltage-stabiliser tube ZD3 and the second NPN type triode Q2; Described first voltage-stabiliser tube ZD3, its negative pole end is as the input of described under-voltage element circuit ZQ1, and its positive terminal is connected with the base terminal of described second NPN type triode Q2; Described second NPN type triode Q2, its collector terminal as the input of described under-voltage element circuit ZQ1, its emitter terminal ground connection GND.
In some illustrative embodiment, described overvoltage element circuit ZQ2 is at least made up of the second voltage-stabiliser tube ZD4 and PNP type triode Q3; Described second voltage-stabiliser tube ZD4, its negative pole end is as the input of described overvoltage element circuit ZQ2, and its positive terminal is connected with the base terminal of described PNP type triode Q3; Described PNP type triode Q3, its emitter connects the output of described overvoltage element circuit ZQ, its collector terminal ground connection GND.
In some illustrative embodiment, described rectification unit circuit BD1 is bridge rectifier, and its output connects described metal-oxide-semiconductor Q4, NPN type triode Q1, overvoltage element circuit ZQ2, under-voltage element circuit ZQ1 by the diode D1, the second resistance R1 that connect successively, the 3rd resistance R2; Wherein, described diode D1 just connects.
In some illustrative embodiment, between described 3rd resistance R2 and described metal-oxide-semiconductor Q2, be in series with the 4th resistance R4.
In some illustrative embodiment, the output of described rectification unit circuit BD1 is connected with the second electric capacity CBB1 of ground connection GND.
In some illustrative embodiment, the negative pole end of described diode D1 is connected with the polar capacitor EC1 of ground connection GND; The positive terminal of described polar capacitor EC1 is connected with the negative pole end of described diode D1, its negative pole end ground connection GND.
In some illustrative embodiment, one end that described 3rd resistance R2 is connected with described metal-oxide-semiconductor Q4, NPN type triode Q1, overvoltage element circuit ZQ2, under-voltage element circuit ZQ1 is connected to the 3rd electric capacity C2 of ground connection GND, and the first pull down resistor R6.
In some illustrative embodiment, the gate terminal of described metal-oxide-semiconductor Q4 is connected to the second pull down resistor R5.
It is the input voltage meeting full voltage input reply country variant in LED power field, for preventing from exceeding because input voltage fluctuation is too high the voltage that power supply normally works, add the normal work of the effective electronic devices and components of over under-voltage protection circuit, input voltage overvoltage or too high all by closedown metal-oxide-semiconductor G pole drive singal, normally start after voltage is normal, effectively prevent because the too low MOS of input voltage bears the electric current of too high peak value, or the too high maximum voltage exceeding metal-oxide-semiconductor Vds of input voltage, can effectively solve because input voltage is close to the problem that normally cannot play machine when crossing pressure point add C1 compared with traditional overvoltage after, start rear pressure point of crossing (just to protect as AC directly inputs 300V power supply much larger than voltage when directly starting again, if but power supply was from when being transferred to pressure point again after low-voltage starts, and to cross pressure point much larger than 300V(traditional circuit be 320V)) simultaneously without low pressure under-voltage protection function, when causing brownout, metal-oxide-semiconductor bears excessive peak current, reduce useful life or quick-fried machine.
In actual conditions; the direct input voltage of AC with normally work after be transferred to pressure point voltage close to (just protect as AC directly inputs 300V overvoltage, if but power supply was transferred to pressure point again after low-voltage startup time to cross pressure point be about 307V (traditional circuit is greater than 320V)).
For the utility model person of an ordinary skill in the technical field; without departing from the concept of the premise utility; its framework form can be flexible and changeable; just make some simple deduction or replace, all should be considered as belonging to the scope of patent protection that the utility model is determined by submitted to claims.
Claims (10)
1. input an over under-voltage protection circuit, it is characterized in that, comprising: rectification unit circuit (BD1), under-voltage element circuit (ZQ1), overvoltage element circuit (ZQ2), NPN type triode (Q1), metal-oxide-semiconductor (Q4) and pulse driving circuit (PWM);
Described NPN type triode (Q1), its base terminal is connected with the output of described rectification unit circuit (BD1), and its collector terminal is connected with the gate terminal of described metal-oxide-semiconductor (Q4), its emitter terminal ground connection (GND);
Described under-voltage element circuit (ZQ1), its input is connected with the output of described rectification unit circuit (BD1), and its output is connected with the base terminal of described NPN type triode (Q1);
Described overvoltage element circuit (ZQ2), its input is connected with the output of described rectification unit circuit (BD1), and its output is connected with the base terminal of described NPN type triode (Q1);
Described metal-oxide-semiconductor (Q4), its gate terminal is connected with the output of described rectification unit circuit (BD1), and its drain electrode end is connected with pulse driving circuit (PWM), its source terminal ground connection (GND).
2. one input over under-voltage protection circuit according to claim 1; it is characterized in that; the first resistance (R3) is also in series with between described rectification unit circuit (BD1) and described NPN type triode (Q1), and first electric capacity (C1) in parallel with described first resistance (R3).
3. one input over under-voltage protection circuit according to claim 1, it is characterized in that, described NPN type triode (Q1) is the first NPN type triode pipe;
Described under-voltage element circuit (ZQ1) is at least made up of the first voltage-stabiliser tube (ZD3) and the second NPN type triode (Q2);
Described first voltage-stabiliser tube (ZD3), its negative pole end is as the input of described under-voltage element circuit (ZQ1), and its positive terminal is connected with the base terminal of described second NPN type triode (Q2);
Described second NPN type triode (Q2), its collector terminal as the input of described under-voltage element circuit (ZQ1), its emitter terminal ground connection (GND).
4. one input over under-voltage protection circuit according to claim 1, it is characterized in that, described overvoltage element circuit (ZQ2) is at least made up of the second voltage-stabiliser tube (ZD4) and PNP type triode (Q3);
Described second voltage-stabiliser tube (ZD4), its negative pole end is as the input of described overvoltage element circuit (ZQ2), and its positive terminal is connected with the base terminal of described PNP type triode (Q3);
Described PNP type triode (Q3), its emitter connects the output of described overvoltage element circuit (ZQ), its collector terminal ground connection (GND).
5. one input over under-voltage protection circuit according to claim 1, it is characterized in that, described rectification unit circuit (BD1) is bridge rectifier, and its output connects described metal-oxide-semiconductor (Q4), NPN type triode (Q1), overvoltage element circuit (ZQ2), under-voltage element circuit (ZQ1) by the diode (D1) that connects successively, the second resistance (R1), the 3rd resistance (R2); Wherein, described diode (D1) just connects.
6. one input over under-voltage protection circuit according to claim 5, is characterized in that, be in series with the 4th resistance (R4) between described 3rd resistance (R2) and described metal-oxide-semiconductor (Q2).
7. one input over under-voltage protection circuit according to claim 5, it is characterized in that, the output of described rectification unit circuit (BD1) is connected with second electric capacity (CBB1) of ground connection (GND).
8. one input over under-voltage protection circuit according to claim 5, it is characterized in that, the negative pole end of described diode (D1) is connected with the polar capacitor (EC1) of ground connection (GND);
The positive terminal of described polar capacitor (EC1) is connected with the negative pole end of described diode (D1), its negative pole end ground connection (GND).
9. one input over under-voltage protection circuit according to claim 5; it is characterized in that; one end that described 3rd resistance (R2) is connected with described metal-oxide-semiconductor (Q4), NPN type triode (Q1), overvoltage element circuit (ZQ2), under-voltage element circuit (ZQ1) is connected to the 3rd electric capacity (C2) of ground connection (GND), and the first pull down resistor (R6).
10. one input over under-voltage protection circuit according to claim 1, it is characterized in that, the gate terminal of described metal-oxide-semiconductor (Q4) is connected to the second pull down resistor (R5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520618284.0U CN204794034U (en) | 2015-08-18 | 2015-08-18 | Input undervoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520618284.0U CN204794034U (en) | 2015-08-18 | 2015-08-18 | Input undervoltage protection circuit |
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| Publication Number | Publication Date |
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| CN204794034U true CN204794034U (en) | 2015-11-18 |
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| CN201520618284.0U Active CN204794034U (en) | 2015-08-18 | 2015-08-18 | Input undervoltage protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107704004A (en) * | 2017-09-05 | 2018-02-16 | 河南省大方重型机器有限公司 | A kind of crane travel switch contact voltage circuit for regulating and controlling |
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2015
- 2015-08-18 CN CN201520618284.0U patent/CN204794034U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107704004A (en) * | 2017-09-05 | 2018-02-16 | 河南省大方重型机器有限公司 | A kind of crane travel switch contact voltage circuit for regulating and controlling |
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