CN209419199U - Self-locking output overvoltage protection circuit and voltage output system - Google Patents
Self-locking output overvoltage protection circuit and voltage output system Download PDFInfo
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- CN209419199U CN209419199U CN201920142116.7U CN201920142116U CN209419199U CN 209419199 U CN209419199 U CN 209419199U CN 201920142116 U CN201920142116 U CN 201920142116U CN 209419199 U CN209419199 U CN 209419199U
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Abstract
The utility model discloses a kind of self-locking output overvoltage protection circuit and voltage output system, including the first input unit, second input unit, sampling unit, partial pressure unit, filter unit, self-locking type switch unit and control unit, first input unit is for inputting first voltage, first input unit is electrically connected with sampling unit, second input unit is for inputting second voltage, second input unit is electrically connected with sampling unit, sampling unit is electrically connected with partial pressure unit, partial pressure unit is electrically connected with filter unit, filter unit is electrically connected with self-locking type switch unit, self-locking type switch unit is electrically connected with control unit, control unit is used to control the shutdown or conducting of power supply.The utility model when occur input terminal voltage it is excessively high when, then can star over-voltage protecting function, avoid burning out the electronic component of rear end connection, avoid the occurrence of the problem of burning out circuit board because of overtension, while improving the stability and reliability of power circuit.
Description
Technical field
The utility model relates to voltage output system regions, more particularly to a kind of self-locking output overvoltage protection circuit and
Voltage output system.
Background technique
Inverse-excitation type (Flyback) transformer is also known as single-ended flyback or " Buck-Boost " converter.Because its output end exists
Energy is obtained when primary side winding disconnects power supply so gaining the name.Inverse excitation type converter is simple with its circuit structure, low in cost and deep
Liked by numerous Developmental Engineer.Flyback transformer is suitble to small-power power and various power supply adaptors.But flyback
The design difficulty of formula converter is the design of transformer, because of wide input voltage range, especially in low input, full load
Under the conditions of transformer can work in continuous current mode, and transformer can work again under high input voltage, light-load conditions
Discontinuous current mode.
However, PFC VCC and LLC VCC are the VCC by circuit of reversed excitation in traditional flyback+PFC+LLC circuit framework
Power supply, the VCC winding of originally LLC transformer will not use, and the VCC over-voltage protecting function of LLC circuit is just without causing
Voltage value is too high when LLC electric power output voltage overvoltage protection, burns out back-end circuit element, and circuit board will be also burnt out when serious, drop
The stability and reliability of low power circuit.
Utility model content
The purpose of the utility model is to overcome shortcomings in the prior art, provide a kind of self-locking output over-voltage protection
Circuit and voltage output system, when occur input terminal voltage it is excessively high when, then can star over-voltage protecting function, avoid burning out
The electronic component of rear end connection, avoids the occurrence of the problem of burning out circuit board because of overtension, while improving the steady of power circuit
Qualitative and reliability.
The purpose of this utility model is achieved through the following technical solutions:
A kind of self-locking output overvoltage protection circuit, comprising: the first input unit, sampling unit, divides the second input unit
Unit, filter unit, self-locking type switch unit and control unit are pressed, the input terminal of first input unit is for inputting first
The output end of voltage, first input unit is electrically connected with the input terminal of the sampling unit, second input unit
For inputting second voltage, the output end of second input unit is electrically connected input terminal with the input terminal of the sampling unit,
The output end of the sampling unit is electrically connected with the input terminal of the partial pressure unit, the output end of the partial pressure unit and the filter
The output end of wave unit is electrically connected, and the output end of the filter unit is electrically connected with the input terminal of the self-locking type switch unit,
The output end of the self-locking type switch unit is electrically connected with the input terminal of described control unit, and the output end of described control unit is used
In the shutdown or conducting of control power supply.
First input unit includes voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3 in one of the embodiments,
And diode D3, the cathode of the voltage-stabiliser tube ZD1 are electrically connected with the first voltage, the anode of the voltage-stabiliser tube ZD1, which is connected, to be connected
It is electrically connected after meeting the voltage-stabiliser tube ZD2, the voltage-stabiliser tube ZD3 and the diode D3 with the input terminal of the sampling unit.
Second input unit includes voltage-stabiliser tube ZD4 and diode D2, the voltage-stabiliser tube in one of the embodiments,
The cathode of ZD4 is electrically connected with the second voltage, and the anode of the voltage-stabiliser tube ZD4 is electrically connected with the anode of the diode D2,
The cathode of the diode D2 is electrically connected with the input terminal of the sampling unit.
The sampling unit includes resistance R3 and capacitor C2, the first end of the resistance R3 in one of the embodiments,
It is electrically connected respectively with first input unit and second input unit, the second end of the resistance R3 and the capacitor C2
First end electrical connection, the capacitor C2 second end ground connection.
The partial pressure unit includes diode D1 and resistance R2, the sun of the diode D1 in one of the embodiments,
Pole is electrically connected with the second end of the resistance R3, and the cathode of the diode D1 is electrically connected with the first end of the resistance R2, institute
State the second end ground connection of resistance R2.
In one of the embodiments, the filter unit include a capacitor C1, the first end of the capacitor C1 respectively with
The input terminal of the self-locking type switch unit and the output end electrical connection of the partial pressure unit, the second termination of the capacitor C1
Ground.
The self-locking type switch unit includes triode Q1 and triode Q2, three pole in one of the embodiments,
The base stage of pipe Q1 is electrically connected with the cathode of the diode D1, the base stage of the collector of the triode Q1 and the triode Q2
Electrical connection, the emitter ground connection of the triode Q1, the emitter of the triode Q2 and the input terminal electricity of described control unit
Connection, the collector of the triode Q2 are electrically connected with the cathode of the diode D1.
The self-locking type switch unit further includes resistance R1 in one of the embodiments, one end of the resistance R1 with
The base stage of the triode Q2 is electrically connected, and the other end of the resistance R1 is electrically connected with the emitter of the triode Q2.
Described control unit includes photoelectrical coupler and triode Q7, the photoelectric coupling in one of the embodiments,
The secondary of device is electrically connected with the output end of the self-locking type switch unit, primary and the triode Q7 of the photoelectrical coupler
Base stage electrical connection, the emitter of the triode Q7 is used for output voltage signal.
A kind of voltage output system, including self-locking output overvoltage protection circuit described in any of the above one.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The utility model is a kind of self-locking output overvoltage protection circuit and voltage output system, passes through setting sampling list
Member, partial pressure unit, filter unit and self-locking type switch unit then pass through when sampling unit collected overtension
Partial pressure unit and filter unit give the self-locking type switch unit Continuity signal, so that the power supply signal of control unit is dragged down, into
And the photoelectrical coupler in control unit is ended, and then control unit is caused not work, and make entire voltage output system
System does not work.When occur input terminal voltage it is excessively high when, then can star over-voltage protecting function, avoid burning out rear end connection
Electronic component avoids the occurrence of the problem of burning out circuit board because of overtension, while improving the stability of power circuit and reliable
Property.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the functional block diagram of the self-locking output overvoltage protection circuit of one embodiment of the utility model；
Fig. 2 is the circuit diagram of self-locking output overvoltage protection circuit shown in FIG. 1；
Fig. 3 is the circuit diagram of the voltage output system of one embodiment of the utility model.
Specific embodiment
The utility model is more fully retouched below with reference to relevant drawings for the ease of understanding the utility model,
It states.The better embodiment of the utility model is given in attached drawing.But the utility model can come in many different forms
It realizes, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making practical new to this
The disclosure of type understands more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein are led with the technology for belonging to the utility model
The normally understood meaning of the technical staff in domain is identical.Terminology used in the description of the utility model herein only be
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term " and or " used herein packet
Include any and all combinations of one or more related listed items.
Primary circuit does not have over-voltage protecting function, and when certain reason causes output overvoltage, output voltage values can be risen to very
Height is easy to burn out the element in back-end circuit in this way, in order to protect back-end circuit element not burn out because of power supply over-voltage, therefore increases
Add this output over-voltage protection latching circuit, it, can be by output voltage overvoltage region control after increasing output over-voltage protection latching circuit
System is in allowed limits.Power supply is not protected when the application mainly solves power supply output overvoltage, output overvoltage voltage value too high fever
Bad back-end circuit element can solve output over-voltage protection problem after increasing this circuit.
Referring to Fig. 1, a kind of self-locking output overvoltage protection circuit, comprising: the input of the first input unit 100, second is single
Member 200, sampling unit 300, partial pressure unit 400, filter unit 500, self-locking type switch unit 600 and control unit 700, it is described
The input terminal of first input unit is for inputting first voltage, output end and the sampling unit of first input unit
Input terminal electrical connection, the input terminal of second input unit is for inputting second voltage, the output of second input unit
End is electrically connected with the input terminal of the sampling unit, and the output end of the sampling unit and the input terminal of the partial pressure unit are electrically connected
It connects, the output end of the partial pressure unit is electrically connected with the output end of the filter unit, the output end of the filter unit and institute
State the input terminal electrical connection of self-locking type switch unit, the output end of the self-locking type switch unit and the input of described control unit
End electrical connection, the output end of described control unit are used to control the shutdown or conducting of power supply.
It should be noted that first input unit 100 is used to obtain the voltage of HVCC, second input unit
200 for obtaining the voltage of VPWR；The sampling unit 300 is used for the voltage using two input units；The partial pressure unit
400 pairs of voltage using unit input divides；The filter unit 500 for realizing input voltage filter effect；Institute
Self-locking type switch unit 600 is stated for realizing overvoltage protection；Described control unit 700 receives for controlling entire circuit
Overvoltage protection signal, and then the output of voltage is truncated.In this way, passing through setting sampling unit, partial pressure unit, filter unit and self-locking
Formula switch unit, when sampling unit collected overtension, then by partial pressure unit and filter unit to it is described from
Latching switch unit Continuity signal, so that the power supply signal of control unit is dragged down, so that the photoelectric coupling in control unit
Device cut-off, and then cause control unit not work, and entire voltage output system is not worked.
It should be noted that referring to Fig. 2, first input unit includes voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, pressure stabilizing
Pipe ZD3 and diode D3, the cathode of the voltage-stabiliser tube ZD1 are electrically connected with the first voltage, the anode series of the voltage-stabiliser tube ZD1
It is electrically connected after the connection connection voltage-stabiliser tube ZD2, the voltage-stabiliser tube ZD3 and the diode D3 with the input terminal of the sampling unit
It connects.In this way, can realize preliminary partial pressure to the high voltage of HVCC, and can also guarantee to input by the way that multiple voltage-stabiliser tubes are arranged
Voltage it is more stable.
Referring to Fig. 2, second input unit includes voltage-stabiliser tube ZD4 and diode D2, the yin of the voltage-stabiliser tube ZD4
Pole is electrically connected with the second voltage, and the anode of the voltage-stabiliser tube ZD4 is electrically connected with the anode of the diode D2, and described two
The cathode of pole pipe D2 is electrically connected with the input terminal of the sampling unit.In this way, by the way that multiple voltage-stabiliser tubes are arranged, it can be to VPWR's
High voltage realizes preliminary partial pressure, and can also guarantee that the voltage of input is more stable.
Referring to Fig. 2, the sampling unit includes resistance R3 and capacitor C2, the first end of the resistance R3 respectively with it is described
The first end electricity of first input unit and second input unit electrical connection, the second end of the resistance R3 and the capacitor C2
Connection, the second end ground connection of the capacitor C2.In this way, two input voltages can be sampled by the way that resistance R3 is arranged, and
It can be with superimposed voltage signal.
It should be noted that referring to Fig. 2, the partial pressure unit includes diode D1 and resistance R2, the diode D1
Anode be electrically connected with the second end of the resistance R3, the cathode of the diode D1 and the first end of the resistance R2 are electrically connected
It connects, the second end ground connection of the resistance R2.In this way, by setting diode D1 and resistance R2, rectification is may be implemented in diode
Effect, resistance R2 and resistance R3 can form partial pressure, realize partial pressure effect.
Referring to Fig. 2, the filter unit include a capacitor C1, the first end of the capacitor C1 respectively with the self-locking
The input terminal of switch unit and the electrical connection of the output end of the partial pressure unit, the second end ground connection of the capacitor C1.In this way, passing through
Capacitor C1 is set, the effect of filtering may be implemented.
Referring to Fig. 2, the self-locking type switch unit includes triode Q1 and triode Q2, the base stage of the triode Q1
It is electrically connected with the cathode of the diode D1, the collector of the triode Q1 is electrically connected with the base stage of the triode Q2, institute
The emitter ground connection of triode Q1 is stated, the emitter of the triode Q2 is electrically connected with the input terminal of described control unit, described
The collector of triode Q2 is electrically connected with the cathode of the diode D1.In this way, by setting triode Q1 and triode Q2,
It can guarantee when over-voltage, self-locking effect may be implemented, guarantee that over-voltage protecting function can be realized steadily.
It should be noted that referring to Fig. 2, the self-locking type switch unit further includes resistance R1, the one of the resistance R1
End is electrically connected with the base stage of the triode Q2, and the other end of the resistance R1 is electrically connected with the emitter of the triode Q2.
It should be noted that described control unit includes photoelectrical coupler and triode Q7, time of the photoelectrical coupler
Grade is electrically connected with the output end of the self-locking type switch unit, the primary and the base stage of the triode Q7 of the photoelectrical coupler
The emitter of electrical connection, the triode Q7 is used for output voltage signal.
The course of work: defeated when+92V or+24V voltage increase when certain reason causes LLC power supply output over-voltage protection
+ 92V the voltage of over-voltage is added on resistance R3 through voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, diode D3 out, makes resistance R3
Both end voltage increases, and+24V the voltage of output overvoltage after diode D2, is also added on resistance R3, also makes resistance through voltage-stabiliser tube ZD4
R3 both end voltage increases, and after resistance R3 both end voltage increases, divides through diode D1, resistance R2, is added to after capacitor C1 filtering
After the B pole tension of the pole the B triode Q1 of triode Q1 increases, the pole C of triode Q1 and the conducting of the pole E, the B pole tension of triode Q2
Decline, the pole C of triode Q2 and the conducting of the pole E, photoelectrical coupler U4A IC power supply are dragged down, photoelectrical coupler U4A ends not work
Make, photoelectrical coupler U4B is also switched off work, the B pole tension decline of triode Q7, and triode Q7 ends work, PFC VCC and
LLC VCC stops power supply, and power supply is in guard mode without output, to achieve the purpose that overvoltage protection, overvoltage protection value it is big
It is small, can be by adjusting voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3, the pressure stabilizing value of voltage-stabiliser tube ZD4 is realized, triode
Q1, triode Q2 form a self-locking route.
It is thus desirable to explanation, primary circuit does not have over-voltage protecting function, defeated when certain reason causes output overvoltage
Voltage value can rise to very high out, be easy to burn out the element in back-end circuit in this way, in order to protect back-end circuit element not because
Power supply over-voltage and burn out, therefore increase this output over-voltage protection latching circuit, can will after increasing output over-voltage protection latching circuit
Output voltage overvoltage region controls in allowed limits.Within the allowable range by the control of output overvoltage value, overpressure value can root
It is adjusted according to actual needs.
Referring to Fig. 3, a kind of voltage output system, including the electricity of self-locking output over-voltage protection described in any of the above one
Road.
The utility model compared with the prior art the advantages of and have the beneficial effect that:
The utility model is a kind of self-locking output overvoltage protection circuit and voltage output system, passes through setting sampling list
Member, partial pressure unit, filter unit and self-locking type switch unit then pass through when sampling unit collected overtension
Partial pressure unit and filter unit give the self-locking type switch unit Continuity signal, so that the power supply signal of control unit is dragged down, into
And the photoelectrical coupler in control unit is ended, and then control unit is caused not work, and make entire voltage output system
System does not work.When occur input terminal voltage it is excessively high when, then can star over-voltage protecting function, avoid burning out rear end connection
Electronic component avoids the occurrence of the problem of burning out circuit board because of overtension, while improving the stability of power circuit and reliable
Property.
Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed
Carefully, but it should not be understood as limiting the scope of the patent of the utility model.It should be pointed out that for the general of this field
For logical technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these are all
Belong to the protection scope of the utility model.Therefore, the scope of protection shall be subject to the appended claims for the utility model patent.
Claims (10)
1. a kind of self-locking output overvoltage protection circuit characterized by comprising the first input unit, is adopted the second input unit
The input terminal of sample unit, partial pressure unit, filter unit, self-locking type switch unit and control unit, first input unit is used
In input first voltage, the output end of first input unit is electrically connected with the input terminal of the sampling unit, and described second
The input terminal of input unit is for inputting second voltage, the input of the output end and the sampling unit of second input unit
End electrical connection, the output end of the sampling unit are electrically connected with the input terminal of the partial pressure unit, the output of the partial pressure unit
End is electrically connected with the output end of the filter unit, the input of the output end of the filter unit and the self-locking type switch unit
End electrical connection, the output end of the self-locking type switch unit are electrically connected with the input terminal of described control unit, described control unit
Output end be used to control the shutdown or conducting of power supply.
2. self-locking output overvoltage protection circuit according to claim 1, which is characterized in that the first input unit packet
Include voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3 and diode D3, the cathode of the voltage-stabiliser tube ZD1 and first voltage electricity
Connection, the anode of the voltage-stabiliser tube ZD1 be connected in series after the voltage-stabiliser tube ZD2, the voltage-stabiliser tube ZD3 and the diode D3 with
The input terminal of the sampling unit is electrically connected.
3. self-locking output overvoltage protection circuit according to claim 1, which is characterized in that the second input unit packet
Voltage-stabiliser tube ZD4 and diode D2 are included, the cathode of the voltage-stabiliser tube ZD4 is electrically connected with the second voltage, the voltage-stabiliser tube ZD4's
Anode is electrically connected with the anode of the diode D2, and the input terminal of the cathode and the sampling unit of the diode D2 is electrically connected
It connects.
4. self-locking output overvoltage protection circuit according to claim 1, which is characterized in that the sampling unit includes electricity
Resistance R3 and capacitor C2, the first end of the resistance R3 are electrically connected with first input unit and second input unit respectively
It connects, the second end of the resistance R3 is electrically connected with the first end of the capacitor C2, the second end ground connection of the capacitor C2.
5. self-locking output overvoltage protection circuit according to claim 4, which is characterized in that the partial pressure unit includes two
Pole pipe D1 and resistance R2, the anode of the diode D1 are electrically connected with the second end of the resistance R3, the yin of the diode D1
Pole is electrically connected with the first end of the resistance R2, the second end ground connection of the resistance R2.
6. self-locking output overvoltage protection circuit according to claim 1, which is characterized in that the filter unit includes one
Capacitor C1, the output with the input terminal of the self-locking type switch unit and the partial pressure unit respectively of the first end of the capacitor C1
End electrical connection, the second end ground connection of the capacitor C1.
7. self-locking output overvoltage protection circuit according to claim 5, which is characterized in that the self-locking type switch unit
Including triode Q1 and triode Q2, the base stage of the triode Q1 is electrically connected with the cathode of the diode D1, three pole
The collector of pipe Q1 is electrically connected with the base stage of the triode Q2, the emitter ground connection of the triode Q1, the triode Q2
Emitter be electrically connected with the input terminal of described control unit, the cathode of the collector of the triode Q2 and the diode D1
Electrical connection.
8. self-locking output overvoltage protection circuit according to claim 7, which is characterized in that the self-locking type switch unit
Further include resistance R1, one end of the resistance R1 is electrically connected with the base stage of the triode Q2, the other end of the resistance R1 with
The emitter of the triode Q2 is electrically connected.
9. self-locking output overvoltage protection circuit according to claim 1, which is characterized in that described control unit includes light
The secondary of electric coupler and triode Q7, the photoelectrical coupler are electrically connected with the output end of the self-locking type switch unit, institute
The primary for stating photoelectrical coupler is electrically connected with the base stage of the triode Q7, and the emitter of the triode Q7 is used for output voltage
Signal.
10. a kind of voltage output system, which is characterized in that exported including self-locking described in any one of claim 1~9
Overvoltage crowbar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920142116.7U CN209419199U (en) | 2019-01-25 | 2019-01-25 | Self-locking output overvoltage protection circuit and voltage output system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920142116.7U CN209419199U (en) | 2019-01-25 | 2019-01-25 | Self-locking output overvoltage protection circuit and voltage output system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209419199U true CN209419199U (en) | 2019-09-20 |
Family
ID=67944288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920142116.7U Withdrawn - After Issue CN209419199U (en) | 2019-01-25 | 2019-01-25 | Self-locking output overvoltage protection circuit and voltage output system |
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| CN (1) | CN209419199U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109888738A (en) * | 2019-01-25 | 2019-06-14 | 惠州三华工业有限公司 | Self-locking output overvoltage protection circuit and voltage output system |
-
2019
- 2019-01-25 CN CN201920142116.7U patent/CN209419199U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109888738A (en) * | 2019-01-25 | 2019-06-14 | 惠州三华工业有限公司 | Self-locking output overvoltage protection circuit and voltage output system |
| CN109888738B (en) * | 2019-01-25 | 2024-04-19 | 惠州三华工业有限公司 | Self-locking output overvoltage protection circuit and voltage output system |
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