CN202930931U - Charging display protection circuit - Google Patents

Charging display protection circuit Download PDF

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Publication number
CN202930931U
CN202930931U CN 201220574713 CN201220574713U CN202930931U CN 202930931 U CN202930931 U CN 202930931U CN 201220574713 CN201220574713 CN 201220574713 CN 201220574713 U CN201220574713 U CN 201220574713U CN 202930931 U CN202930931 U CN 202930931U
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China
Prior art keywords
voltage
output
input end
circuit
described voltage
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Expired - Fee Related
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CN 201220574713
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Chinese (zh)
Inventor
王坚
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Shenzhen TCL New Technology Co Ltd
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Shenzhen TCL New Technology Co Ltd
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Abstract

The utility model discloses a charging display protection circuit, comprising a voltage input end, a voltage output end, a voltage protection circuit used for protecting the output voltage of the voltage input end, and a voltage state display circuit used for displaying the input voltage state of the voltage input end, wherein the first input end of the voltage protection circuit is connected with the voltage input end, the first output end of the voltage protection circuit is connected with the second input end of the voltage state display circuit, the second input end of the voltage protection circuit is connected with the output end of the voltage state display circuit, the second output end of the voltage protection circuit is connected with the voltage output end, and the first input end of the voltage state display circuit is connected with the voltage input end. The charging display protection circuit can enable users to clearly and visually understand the state of the input voltage, and also has overvoltage protection and reversal connection protection functions.

Description

Charging shows protective circuit
Technical field
The utility model relates to the electronic circuit technology field, relates in particular to a kind of charging and shows protective circuit.
Background technology
Colour TV is from the passed by brilliant road of a technological innovation of CRT flat board till now.Consumer's requirement now is more and more higher, and colour TV also develops to 3D from 2D, to satisfy the ever-increasing demand of consumer.The mode that realizes at present 3D has multiple, and wherein mode the most ripe, that effect is best is the mode that adopts the liquid crystal electron light valve spectacles to watch.It is provided with a synchronized transmissions and receiving system, TV shows the image of left eye and right eye according to certain rules, receiving system receives the liquid crystal light valve that corresponding synchronizing signal is controlled respectively right and left eyes, allows right and left eyes see respectively corresponding image, the image of compound stereoscopic in brain.
The liquid crystal electron light valve spectacles is active mode, therefore needs power supply, and early stage, major part was taked the supply power mode of button cell, but the power-on time of this supply power mode is short, also needs frequently to change battery, price, not environmental protection.Use now the lithium rechargeable pond as power supply, used simultaneously the USB mouth as the socket of charging, solved the problem of frequent replacing battery, but this has also brought new problem.Because the voltage of USB mouth does not have mandatory requirement, when using the USB charging, the charging voltage that during possible liquid crystal electron light valve spectacles charging, reality connects is higher than the 5V that designs.The voltage of general USB mouth is 5V, but some commercially available product voltage may be 12V or higher, and the voltage of out of order USB mouth may arrive 24V in addition.As everyone knows, the charging of lithium battery has strict demand, and overvoltage will be brought on fire and blast.Therefore need a protective device to realize differentiation and switch to input voltage, existing charging overvoltage protection circuit is too complicated, can not show intuitively the state of USB mouth output voltage simultaneously.
The utility model content
Main purpose of the present utility model is to provide a kind of charging and shows protective circuit, aims to provide a kind of charging demonstration protective circuit that can show the charging voltage state, have simultaneously overvoltage protection and reverse connecting protection.
In order to achieve the above object, the utility model proposes a kind of charging and show protective circuit, this charging shows that protective circuit comprises voltage input end, voltage output end, is used for the voltage protection circuit that described voltage input end output voltage is protected and the voltage status display circuit that is used for showing described voltage input end input voltage state; Wherein,
The first input end of described voltage protection circuit is connected with described voltage input end, the first output is connected with the second input of described voltage status display circuit, the second input is connected with the output of described voltage status display circuit, and the second output is connected with described voltage output end; The first input end of described voltage status display circuit is connected with described voltage input end.
The overvoltage crowbar of protective circuit when preferably, described voltage protection circuit comprises the reverse-connection protection circuit of protecting for to electric voltage reverse-connection the time and is used for overvoltage; Wherein,
The input of described reverse-connection protection circuit is that the input of described voltage protection circuit is connected with described voltage input end, and output is connected with the first input end of described overvoltage crowbar; The first output of described overvoltage crowbar is that the first output of described voltage protection circuit is connected with the first input end of described voltage status display circuit; the second input is that the second input of described voltage protection circuit is connected with the output of described voltage status display circuit, and the second output is that the second output of described voltage protection circuit is connected with described voltage output end.
Preferably; described reverse-connection protection circuit comprises diode; the anode of this diode is that the input of described reverse-connection protection circuit is connected with described voltage input end, and negative electrode is that the output of described reverse-connection protection circuit is connected with the first input end of described overvoltage crowbar.
Preferably, described overvoltage crowbar comprises metal-oxide-semiconductor, triode and voltage-stabiliser tube; Wherein:
The source electrode of described metal-oxide-semiconductor is that the first input end of described overvoltage crowbar is connected with the negative electrode of described diode, and the second output that drains as described overvoltage crowbar is connected with described voltage output end, and grid is connected with ground; The emitter of described triode is connected with the source electrode of described metal-oxide-semiconductor and is connected with the negative electrode of described diode, base stage is that the first output of described overvoltage crowbar is connected with the second input of described voltage status display circuit, and collector electrode is connected with the grid of described metal-oxide-semiconductor and is connected with ground; The negative electrode of described voltage-stabiliser tube is that the second input of described overvoltage crowbar is connected with the output of described voltage status display circuit, and anode is connected with ground.
Preferably, described overvoltage crowbar also comprises biasing resistor, and this biasing resistor is connected between the grid and ground of described metal-oxide-semiconductor.
Preferably, described metal-oxide-semiconductor is P type metal-oxide-semiconductor.
Preferably, described triode is the positive-negative-positive triode.
Preferably, described voltage status display circuit comprises the first light-emitting diode, the second light-emitting diode and the 3rd light-emitting diode; Wherein:
The anode of described the first light-emitting diode is that the first input end of described voltage status display circuit is connected with described voltage input end, and negative electrode is connected with ground; The negative electrode of described the second light-emitting diode be connected with described voltage input end and with the anodic bonding of described the first light-emitting diode, anode is that the output of described voltage status display circuit is connected with the negative electrode of described voltage-stabiliser tube; The anode of described the 3rd light-emitting diode is that described voltage status display circuit the second input is connected with the base stage of described triode, and negative electrode is with the anodic bonding of described the second light-emitting diode and be connected with the negative electrode of described voltage-stabiliser tube.
Preferably, described voltage status display circuit also comprises the first current-limiting resistance, and this first current-limiting resistance is connected between the negative electrode and ground of described the first light-emitting diode.
Preferably, described voltage status display circuit also comprises the second current-limiting resistance, and an end of this second current-limiting resistance is connected with the anodic bonding of described the second light-emitting diode and with the negative electrode of described the 3rd light-emitting diode, and the other end is connected with the negative electrode of described voltage-stabiliser tube.
The utility model has realized that by the voltage status display circuit is set the overvoltage to input voltage, normal and three kinds of states of reversal connection show respectively; make the user can understand clear, intuitively the state of input voltage, and this charging show that protective circuit also has overvoltage protection and reversal connection protection function.
Description of drawings
Fig. 1 is the structural representation that the utility model charging shows protective circuit;
Fig. 2 is the circuit diagram that the utility model charging shows protective circuit.
The realization of the utility model purpose, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Be described further with regard to the technical solution of the utility model below in conjunction with drawings and the specific embodiments.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
With reference to Fig. 1, Fig. 1 is the structural representation that the utility model charging shows protective circuit.
In the present embodiment, a kind of charging shows protective circuit, comprises voltage input end 10, voltage output end 20, is used for the voltage protection circuit 30 that voltage input end 10 output voltages are protected and the voltage status display circuit 40 that is used for showing voltage input end 10 input voltage states; Wherein,
The first input end of voltage protection circuit 30 is connected with voltage input end 10, the first output is connected with the second input of voltage status display circuit 40, the second input is connected with the output of voltage status display circuit 40, and the second output is connected with voltage output end 20; The first input end of voltage status display circuit 40 is connected with voltage input end 10.
When charging normal situation, setting voltage is 5V.During charging; voltage input end 10 connects the USB mouth; when USB mouth output voltage equals setting voltage 5V; voltage protection circuit 30 work make voltage export from voltage output end 20 through the second output of voltage protection circuit 30 again; at this moment, the voltage status display circuit 40 that is connected with voltage input end 10 can show the normal corresponding signal of voltage.When USB mouth output voltage greater than charging during normal setting voltage; voltage protection circuit 30 work make voltage output end 20 there is no Voltage-output; at this moment, the voltage status display circuit 40 that is connected with voltage input end 10 can show the corresponding signal of input voltage overvoltage.When electric voltage reverse-connection, voltage protection circuit 30 internal works are protected reversal connection and controlled voltage output end 20 does not have Voltage-output, and the voltage status display circuit 40 that is connected with voltage input end 10 simultaneously can show the corresponding signal of electric voltage reverse-connection.
By being set, voltage status display circuit 40 realized that the overvoltage to input voltage, normal and three kinds of states of reversal connection show respectively; make the user can understand clear, intuitively the state of input voltage, and this charging show that protective circuit also has overvoltage protection and reversal connection protection function.
The overvoltage crowbar 302 of protective circuit when further, voltage protection circuit 30 comprises the reverse-connection protection circuit 301 of protecting for to reversal connection voltage the time and is used for overvoltage; Wherein,
The input of reverse-connection protection circuit 301 is that the input of voltage protection circuit 30 is connected with voltage input end 10, and output is connected with the first input end of overvoltage crowbar 302; The first output of overvoltage crowbar 302 is that the first output of voltage protection circuit 30 is connected with the first input end of voltage status display circuit 40; the second input is that the second input of voltage protection circuit 30 is connected with the output of voltage status display circuit 40, and the second output is that the second output of voltage protection circuit 30 is connected with voltage input end 10.
With reference to Fig. 2, Fig. 2 is the circuit diagram that the utility model charging shows protective circuit.
Particularly, reverse-connection protection circuit 301 comprises diode D1, and the anode of this diode D1 is that the input of reverse-connection protection circuit 301 is connected with voltage input end 10, and negative electrode is that the output of reverse-connection protection circuit 301 is connected with voltage output end 20.
Further, above-mentioned overvoltage crowbar 302 comprises metal-oxide-semiconductor Q2, triode Q1 and voltage-stabiliser tube D5; Wherein:
The source electrode of metal-oxide-semiconductor Q2 is that the first input end of overvoltage crowbar 302 is connected with the negative electrode of diode D1, and the second output that drains as overvoltage crowbar 302 is connected with voltage output end 20, and grid is connected with ground; The emitter of triode Q1 is connected with the source electrode of metal-oxide-semiconductor Q2 and is connected with the negative electrode of diode D1, base stage is that the first output of overvoltage crowbar 302 is connected with the second input of voltage status display circuit 40, and collector electrode is connected and is connected with ground with the grid of metal-oxide-semiconductor Q2; The negative electrode of voltage-stabiliser tube D5 is that the second input of overvoltage crowbar 302 is connected with the output of voltage status display circuit 40, and anode is connected with ground.
Particularly, overvoltage crowbar 302 also comprises biasing resistor R3, and this biasing resistor R3 is connected between the grid and ground of metal-oxide-semiconductor Q2.
Particularly, metal-oxide-semiconductor Q2 is P type metal-oxide-semiconductor.
Particularly, triode Q1 is the positive-negative-positive triode.
Further, above-mentioned voltage status display circuit 40 comprises the first light-emitting diode D2, the second light-emitting diode D3 and the 3rd light-emitting diode D4; Wherein:
The anode of the first light-emitting diode D2 is that the first input end of voltage status display circuit 40 is connected with voltage input end 10, and negative electrode is connected with ground; The negative electrode of the second light-emitting diode D3 be connected with voltage input end 10 and with the anodic bonding of the first light-emitting diode D2, anode is that the output of voltage status display circuit 40 is connected with the negative electrode of voltage-stabiliser tube D5; The anode of the 3rd light-emitting diode D4 is that voltage status display circuit 40 second inputs are connected with the base stage of triode Q1, and negative electrode is with the anodic bonding of the second light-emitting diode D3 and be connected with the negative electrode of voltage-stabiliser tube D5.In the present embodiment, send green glow during the first light-emitting diode D2 conducting, send ruddiness during the second light-emitting diode D3 conducting, send gold-tinted during the 3rd light-emitting diode D4 conducting, the first light-emitting diode D2, the second light-emitting diode D3 and the 3rd light-emitting diode D4 are packaged together and form a luminescent device.
Particularly, voltage status display circuit 40 also comprises the first current-limiting resistance R1, and this first current-limiting resistance R1 is connected between the negative electrode and ground of the first light-emitting diode D2.
Particularly, voltage status display circuit 40 also comprises the second current-limiting resistance R2, and the end of this second current-limiting resistance R2 is connected with the anodic bonding of the second light-emitting diode D3 and with the negative electrode of the 3rd light-emitting diode D4, and the other end is connected with the negative electrode of voltage-stabiliser tube D5.
Under the state that charges normal, when the voltage of voltage input end 10 inputs equals 5V, the first light-emitting diode D2 conducting, not conducting of triode Q1, not conducting of voltage-stabiliser tube D5, at this moment, the second light-emitting diode D3 and the 3rd light-emitting diode D4 all can not conductings, so the time, what luminescent device showed is green light.At this moment, metal-oxide-semiconductor Q2 is because of biasing resistor R3 conducting, and voltage is from voltage output end 20 outputs, and charging shows the protective circuit normal operation.When using this USB mouth charging when the USB mouth is abnormal; the voltage of voltage input end 10 inputs can be greater than 5V; at this moment; voltage-stabiliser tube D5 conducting, triode Q1 conducting, the triode Q1 short circuit that the source electrode of metal-oxide-semiconductor Q2 and grid are switched on; therefore not output of metal-oxide-semiconductor Q2; so the time, voltage output end does not have Voltage-output, and this moment, circuit was in the overvoltage protection state.Simultaneously, the first light-emitting diode D2 and the 3rd equal conducting of light-emitting diode D4 are because the first light-emitting diode D2 sends green glow, the 3rd light-emitting diode D4 sends gold-tinted, and green glow and yellow light mix are orange light, so the time, luminescent device is shown as orange lamp, and expression is from the overtension of USB mouth output.When input voltage reverse connection, therefore diode D1 reverse blocking does not have Voltage-output, at this moment, voltage again through the second light-emitting diode D3, glows the second light-emitting diode D3 conducting through voltage-stabiliser tube D5, at this moment, what luminescent device showed is red light, expression USB mouth electric voltage reverse-connection.
Light-emitting diode by three kinds of colors are set shows respectively with the status lamp of different colours the overvoltage of input voltage, normal and three kinds of states of reversal connection; make the user can understand clear, intuitively the state of input voltage; in addition; electric voltage over press, reversal connection also had defencive function; simultaneously, whole charging shows that protective circuit is simple in structure, easy realization.
The above is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure transformation that utilizes the utility model specification and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present utility model.

Claims (10)

1. a charging shows protective circuit, it is characterized in that, comprise voltage input end, voltage output end, be used for the voltage protection circuit that described voltage input end output voltage is protected and the voltage status display circuit that is used for showing described voltage input end input voltage state; Wherein,
The first input end of described voltage protection circuit is connected with described voltage input end, the first output is connected with the second input of described voltage status display circuit, the second input is connected with the output of described voltage status display circuit, and the second output is connected with described voltage output end; The first input end of described voltage status display circuit is connected with described voltage input end.
2. charging as claimed in claim 1 shows protective circuit, it is characterized in that the overvoltage crowbar of protective circuit when described voltage protection circuit comprises the reverse-connection protection circuit of protecting for to electric voltage reverse-connection the time and is used for overvoltage; Wherein,
The input of described reverse-connection protection circuit is that the input of described voltage protection circuit is connected with described voltage input end, and output is connected with the first input end of described overvoltage crowbar; The first output of described overvoltage crowbar is that the first output of described voltage protection circuit is connected with the first input end of described voltage status display circuit; the second input is that the second input of described voltage protection circuit is connected with the output of described voltage status display circuit, and the second output is that the second output of described voltage protection circuit is connected with described voltage output end.
3. charging as claimed in claim 2 shows protective circuit; it is characterized in that; described reverse-connection protection circuit comprises diode; the anode of this diode is that the input of described reverse-connection protection circuit is connected with described voltage input end, and negative electrode is that the output of described reverse-connection protection circuit is connected with the first input end of described overvoltage crowbar.
4. charging as claimed in claim 3 shows protective circuit, it is characterized in that, described overvoltage crowbar comprises metal-oxide-semiconductor, triode and voltage-stabiliser tube; Wherein:
The source electrode of described metal-oxide-semiconductor is that the first input end of described overvoltage crowbar is connected with the negative electrode of described diode, and the second output that drains as described overvoltage crowbar is connected with described voltage output end, and grid is connected with ground; The emitter of described triode is connected with the source electrode of described metal-oxide-semiconductor and is connected with the negative electrode of described diode, base stage is that the first output of described overvoltage crowbar is connected with the second input of described voltage status display circuit, and collector electrode is connected with the grid of described metal-oxide-semiconductor and is connected with ground; The negative electrode of described voltage-stabiliser tube is that the second input of described overvoltage crowbar is connected with the output of described voltage status display circuit, and anode is connected with ground.
5. charging as claimed in claim 4 shows protective circuit, it is characterized in that, described overvoltage crowbar also comprises biasing resistor, and this biasing resistor is connected between the grid and ground of described metal-oxide-semiconductor.
6. charging as claimed in claim 5 shows protective circuit, it is characterized in that, described metal-oxide-semiconductor is P type metal-oxide-semiconductor.
7. charging as claimed in claim 6 shows protective circuit, it is characterized in that, described triode is the positive-negative-positive triode.
8. charging as claimed in claim 7 shows protective circuit, it is characterized in that, described voltage status display circuit comprises the first light-emitting diode, the second light-emitting diode and the 3rd light-emitting diode; Wherein:
The anode of described the first light-emitting diode is that the first input end of described voltage status display circuit is connected with described voltage input end, and negative electrode is connected with ground; The negative electrode of described the second light-emitting diode be connected with described voltage input end and with the anodic bonding of described the first light-emitting diode, anode is that the output of described voltage status display circuit is connected with the negative electrode of described voltage-stabiliser tube; The anode of described the 3rd light-emitting diode is that described voltage status display circuit the second input is connected with the base stage of described triode, and negative electrode is with the anodic bonding of described the second light-emitting diode and be connected with the negative electrode of described voltage-stabiliser tube.
9. charging as claimed in claim 8 shows protective circuit, it is characterized in that, described voltage status display circuit also comprises the first current-limiting resistance, and this first current-limiting resistance is connected between the negative electrode and ground of described the first light-emitting diode.
10. charging shows protective circuit as claimed in claim 8 or 9; it is characterized in that; described voltage status display circuit also comprises the second current-limiting resistance; one end of this second current-limiting resistance is connected with the anodic bonding of described the second light-emitting diode and with the negative electrode of described the 3rd light-emitting diode, and the other end is connected with the negative electrode of described voltage-stabiliser tube.
CN 201220574713 2012-11-02 2012-11-02 Charging display protection circuit Expired - Fee Related CN202930931U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014187045A1 (en) * 2013-05-23 2014-11-27 中兴通讯股份有限公司 Device and method for realizing bidirectional power supply on the basis of single port
CN107147971A (en) * 2016-03-01 2017-09-08 卡讯电子股份有限公司 Under-voltage protection radio reception monomer and its control method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014187045A1 (en) * 2013-05-23 2014-11-27 中兴通讯股份有限公司 Device and method for realizing bidirectional power supply on the basis of single port
CN104182020A (en) * 2013-05-23 2014-12-03 中兴通讯股份有限公司 Single-port-based device and method for realizing bi-directional power supply
CN107147971A (en) * 2016-03-01 2017-09-08 卡讯电子股份有限公司 Under-voltage protection radio reception monomer and its control method

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130508

Termination date: 20211102