CN208623327U - Discharge circuit - Google Patents
Discharge circuit Download PDFInfo
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- CN208623327U CN208623327U CN201821192264.1U CN201821192264U CN208623327U CN 208623327 U CN208623327 U CN 208623327U CN 201821192264 U CN201821192264 U CN 201821192264U CN 208623327 U CN208623327 U CN 208623327U
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- control unit
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Abstract
The utility model provides a kind of discharge circuit, is set between power supply control chip and display equipment, comprising: discharge cell, input terminal and the electrolytic capacitor in display equipment of discharge cell are electrically connected, and the output end of discharge cell is connected to the ground；First control unit, the output end of first control unit are electrically connected with the output end of the input terminal of discharge cell and electrolytic capacitor respectively；Second control unit, the input terminal of second control unit and the output end of the backlight switch in display equipment are electrically connected, the output end of second control unit and the input terminal of first control unit are electrically connected, the utility model is when the second control unit receives the low level signal of backlight switch sending, determine that high-speed switch machine phenomenon has occurred in display equipment, second control unit at this time, first control unit and discharge cell are on state, and then timely and effectively the voltage on electrolytic capacitor can be discharged, prevent the generation of scintillation in display equipment, improve user experience.
Description
Technical field
The utility model relates to electronic circuit technology field, in particular to a kind of discharge circuit.
Background technique
The use of continuous improvement of people's living standards with the development of the times, electronic equipment is more and more frequent, and existing
Electronic equipment on display equipment can be set, to facilitate the observation of user, display equipment circuit system in can be arranged
For multiple electrolytic capacitors to meet the needs of circuit function, the process for carrying out charge and discharge to it in the use process of electrolytic capacitor is outstanding
To be important, therefore the normal work in order to ensure electrolytic capacitor, show the manufacturer of equipment to the discharge circuit in display equipment
Increasingly pay attention to.
Voltage in existing discharge circuit use process, when showing that high-speed switch machine occurs for equipment, on electrolytic capacitor
It cannot timely discharge, and then be easy to cause in display equipment and scintillation occurs, reduce the usage experience of user.
Utility model content
Based on this, being designed to provide for the utility model embodiment is a kind of when showing that high-speed switch machine occurs for equipment,
The discharge circuit of voltage on electrolytic capacitor can be discharged in time.
A kind of discharge circuit is set between power supply control chip and display equipment, comprising:
Discharge cell, input terminal and the electrolytic capacitor in display equipment of the discharge cell are electrically connected, the electric discharge
The output end of unit is connected to the ground, and the discharge cell is used for when it is the on state, by the voltage on the electrolytic capacitor
Import ground；
First control unit, the output end of the first control unit respectively with the input terminal of the discharge cell and described
The output end of electrolytic capacitor is electrically connected, and the first control unit for controlling the discharge cell when it is the on state
Conducting；
Second control unit, the output of the input terminal of second control unit and the backlight switch in the display equipment
End is electrically connected, and the input terminal of the output end of second control unit and the first control unit is electrically connected, and described the
Two control units are used for the conducting when receiving the low level signal that the backlight switch issues, single to control first control
The conducting of member.
Above-mentioned discharge circuit effectively leads the first control unit by the design of second control unit
Logical state is controlled, by the design of the first control unit, effectively to the on state of the discharge cell into
Control of having gone is issued by the design of the discharge cell so as to work as second control unit and receive the backlight switch
Low level signal when, determine that high-speed switch machine phenomenon has occurred in the display equipment, at this time second control unit, described
First control unit and the discharge cell are on state, and then can be timely and effectively by the electricity on the electrolytic capacitor
Pressure is discharged, it is therefore prevented that the generation of scintillation in the display equipment improves user experience.
Further, the discharge cell include the first triode and with the concatenated first resistor of the first triode,
The output end of the input terminal of the first resistor and the electrolytic capacitor is electrically connected, and when first triode ON will be described
Voltage on electrolytic capacitor imports ground.
Further, the collector of first triode and the first resistor are electrically connected, first triode
Base stage and second control unit be electrically connected, the emitter of first triode is connected to ground.
Further, the first control unit include voltage-stabiliser tube and respectively with the concatenated second resistance of the voltage-stabiliser tube,
The output end of 3rd resistor, the second resistance and the electrolytic capacitor is electrically connected, and the 3rd resistor is connected to ground, described
Voltage-stabiliser tube controls the conducting of the discharge cell when being connected.
Further, second control unit include the second triode and respectively with second triode concatenated the
Four resistance, the 5th resistance, the input terminal of the 4th resistance and the output end of the backlight switch are electrically connected, the 5th electricity
The output end of resistance is electrically connected with the first control unit and the discharge cell respectively, the second triode ON time control
Make the conducting of the voltage-stabiliser tube.
Further, the base stage of the collector of second triode and first triode is electrically connected, and described the
The base stage of two triodes and the 4th resistance are electrically connected, and the transmitter of second triode and the 5th resistance are electrical
Connection.
Further, Overvoltage protecting unit, the over-voltage are equipped between the electrolytic capacitor and the first control unit
Protection location is for preventing the first control unit due to the excessive caused damage of input voltage.
Further, the Overvoltage protecting unit include the 6th resistance and with concatenated 7th resistance of the 6th resistance,
7th resistance is equipped with overvoltage protection port, is electrically connected with overvoltage protector on the overvoltage protection port.
Detailed description of the invention
Fig. 1 is the electrical block diagram for the discharge circuit that the utility model first embodiment provides；
Fig. 2 is the electrical block diagram for the discharge circuit that the utility model first embodiment provides；
Essential element symbol description
| Discharge circuit | 100,100a | Second control unit | 10 |
| First control unit | 20 | Discharge cell | 30 |
| Overvoltage protecting unit | 40 | First resistor | R1 |
| Second resistance | R2 | 3rd resistor | R3 |
| 4th resistance | R4 | 5th resistance | R5 |
| 6th resistance | R6 | 7th resistance | R7 |
| Electrolytic capacitor anode | LED+ | First triode | Q1 |
| Second triode | Q2 | Power supply control chip input terminal | S1 |
| Overvoltage protection port | S2 | Voltage-stabiliser tube | Z1 |
| Backlight switch | BLON |
The following detailed description will be further explained with reference to the above drawings the utility model.
Specific embodiment
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing to this
The specific embodiment of utility model is described in detail.Several embodiments of the utility model are given in attached drawing.But this
Utility model can be realized in many different forms, however it is not limited to embodiment described herein.On the contrary, providing these
The purpose of embodiment is to keep the disclosure to the utility model more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixedly arranged 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 ", "upper", "lower" and similar statement for illustrative purposes only, rather than the device or member of indication or suggestion meaning
Part must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu
It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood as the case may be
Concrete meaning in the present invention.Term " and or " used herein includes one or more relevant listed items
Any and all combinations.
Partial display manufacturer is very stringent to the ripple requirement of back facet current, to prevent the damage of display equipment.In order to reach
It to this purpose, exports electrolytic capacitor filter and often adds especially big, therefore will appear a problem, when display equipment occurs quickly
When switching on and shutting down, the energy in constant-current electrolysis can not discharge, when the light modulation of backlight low duty ratio, it may appear that backlight dodges feelings
Condition.Since the starting of constant current IC is to charge to the pin of power supply control chip, when voltage reaches a timing, IC starting, at this point, permanent
Stream IC carries out switching channels MOS with the PWM dimmed, since dimming duty cycle is small, the time of the pin charging of power supply control chip
It is very long, lead to show the electrolytic capacitor electric discharge in equipment in start-up course, leads to backlight open, and then human eye is identifiable sees
Display equipment has flashed, therefore the utility model provides one kind when showing that high-speed switch machine occurs for equipment, can release in time
The discharge circuit of voltage on electrolytic capacitor is put, to prevent the generation of scintillation in display equipment.
Referring to Fig. 1, the electrical block diagram of the discharge circuit 100 provided for the utility model first embodiment, if
Between power supply control chip input terminal S1 and display equipment, comprising:
Discharge cell 30, input terminal and the electrolytic capacitor in display equipment of the discharge cell 30 are electrically connected, described
The output end of discharge cell 30 is connected to the ground, and the discharge cell 30 is used for when it is the on state, by the electrolytic capacitor
On voltage import ground, and then effectively the voltage on the electrolytic capacitor can be discharged, to prevent the display from setting
The generation of standby upper scintillation.
First control unit 20, the output end of the first control unit 20 input terminal with the discharge cell 30 respectively
It is electrically connected with the output end of the electrolytic capacitor, the first control unit 20 is for described in control when it is the on state
The conducting of discharge cell 30, by the design of the first control unit 20, effectively to the conducting shape of the discharge cell 30
State is controlled.
Second control unit 10, the input terminal of second control unit 10 and the backlight switch shown in equipment
The output end of BLON is electrically connected, the input terminal electricity of the output end of second control unit 10 and the first control unit 20
Property connection, second control unit 10 is used for the conducting when receiving the low level signal that the backlight switch BLON is issued,
To control the conducting of the first control unit 20, by the design of second control unit 10, effectively to described first
The on state of control unit 20 is controlled.
Specifically, the discharge cell 30 is electric including the first triode Q1 and with the first triode Q1 concatenated first
R1 is hindered, the input terminal of the first resistor R1 and the output end of the electrolytic capacitor are electrically connected, and the first triode Q1 is led
Voltage on the electrolytic capacitor is imported into ground when logical, switch is effectively played by the design of the first triode Q1
Effect, when the first triode Q1 is in the conductive state, then the discharge cell 30 is generally on state to institute
The voltage stated on electrolytic capacitor is discharged.
In the present embodiment, the collector and the first resistor R1 of the first triode Q1 is electrically connected, and described first
The base stage of triode Q1 and second control unit 10 are electrically connected, and the emitter of the first triode Q1 is connected to ground.
Specifically, the first control unit 20 is electric with the voltage-stabiliser tube Z1 concatenated second including voltage-stabiliser tube Z1 and respectively
Hinder R2, the output end of 3rd resistor R3, the second resistance R2 and the electrolytic capacitor is electrically connected, the 3rd resistor R3 with
Ground connection, the voltage-stabiliser tube Z1 control the conducting of the discharge cell 30 when being connected.
Preferably, second control unit 10 includes the second triode Q2 and connects respectively with the second triode Q2
The 4th resistance R4, the 5th resistance R5, the output end of the input terminal of the 4th resistance R4 and the backlight switch BLON is electrical
Connection, the output end of the 5th resistance R5 are electrically connected with the first control unit 20 and the discharge cell 30 respectively,
The second triode Q2 controls the conducting of the voltage-stabiliser tube Z1 when being connected.
The base stage of the collector of the second triode Q2 and the first triode Q1 are electrically connected, the two or three pole
The base stage of pipe Q2 and the 4th resistance R4 are electrically connected, the transmitter of the second triode Q2 and the 5th resistance R5 electricity
Property connection.
Specifically, the working principle of the present embodiment are as follows:
When the display equipment is in it is standby when, the electrolytic capacitor anode LED+ can not be such that the voltage-stabiliser tube Z1 is connected,
Therefore stand-by power consumption will not be had an impact.When the display equipment is closed, the backlight switch BLON exports low level, this
Shi Suoshu electrolytic capacitor anode LED+ can be such that the voltage-stabiliser tube Z1 is connected, at this time the first control unit 20 and described second
Control unit 10 is on state, and then the first triode Q1 is connected, to reach the electrolytic capacitor anode
Voltage on LED+ is released, to prevent the generation of the display equipment scintillation.When power supply works normally, the back
Photoswitch BLON exports high level signal, and the second triode Q2 is in off state, so that load is not involved in work.
In the present embodiment, by the design of second control unit 10, effectively to the first control unit 20
On state is controlled, by the design of the first control unit 20, effectively to the conducting of the discharge cell 30
State is controlled, by the design of the discharge cell 30, so that when second control unit 10 receives the back
When the low level signal that photoswitch BLON is issued, determine that the display equipment has occurred high-speed switch machine phenomenon, described at this time the
Two control units 10, the first control unit 20 and the discharge cell 30 are on state, and then can be timely and effective
The voltage on the electrolytic capacitor is discharged, it is therefore prevented that it is described display equipment on scintillation generation, improve use
Family experience.
Referring to Fig. 2, the electrical block diagram of the discharge circuit 100a provided for the utility model second embodiment, it should
The structure of second embodiment and first embodiment is more or less the same, and difference is, electrolytic capacitor described in the present embodiment and described the
Overvoltage protecting unit 40 is equipped between one control unit 20, the Overvoltage protecting unit 40 is for preventing the first control unit
20 due to the excessive caused damage of input voltage.
The Overvoltage protecting unit 40 include the 6th resistance R6 and with the concatenated 7th resistance R7 of the 6th resistance R6, institute
It states the 7th resistance R7 and is equipped with overvoltage protection port S2, be electrically connected with overvoltage protector on the overvoltage protection port S2, into
And by the design of the Overvoltage protecting unit 40, the damage due to the excessive caused component of voltage is effectively prevented, is improved
The service life of the discharge circuit 100a.
Above embodiment described the technical principle of the utility model, these descriptions are intended merely to explain the utility model
Principle, and it cannot be construed to the limitation of scope of protection of the utility model in any way.Based on the explanation herein, the skill of this field
Art personnel do not need to pay for creative labor other specific embodiments that can associate the utility model, these modes are all
It will fall into the protection scope of the utility model.
Claims (8)
1. a kind of discharge circuit is set between power supply control chip and display equipment characterized by comprising
Discharge cell, input terminal and the electrolytic capacitor in display equipment of the discharge cell are electrically connected, the discharge cell
Output end be connected to the ground, the discharge cell imports the voltage on the electrolytic capacitor for when it is the on state
Ground；
First control unit, the output end of the first control unit respectively with the input terminal of the discharge cell and the electrolysis
The output end of capacitor is electrically connected, and the first control unit for controlling leading for the discharge cell when it is the on state
It is logical；
Second control unit, the output end electricity of the input terminal of second control unit and the backlight switch in the display equipment
Property connection, the input terminal of the output end of second control unit and the first control unit is electrically connected, second control
Unit processed is used for the conducting when receiving the low level signal that the backlight switch issues, to control the first control unit
Conducting.
2. discharge circuit according to claim 1, it is characterised in that: the discharge cell include the first triode and with institute
The concatenated first resistor of the first triode is stated, the input terminal of the first resistor and the output end of the electrolytic capacitor electrically connect
It connects, the voltage on the electrolytic capacitor is imported into ground when first triode ON.
3. discharge circuit according to claim 2, it is characterised in that: the collector of first triode and described first
Resistance is electrically connected, and the base stage of first triode and second control unit are electrically connected, first triode
Emitter is connected to ground.
4. discharge circuit according to claim 2, it is characterised in that: the first control unit includes voltage-stabiliser tube and difference
With the concatenated second resistance of the voltage-stabiliser tube, 3rd resistor, the second resistance and the output end of the electrolytic capacitor electrically connect
It connects, the 3rd resistor is connected to ground, and the voltage-stabiliser tube controls the conducting of the discharge cell when being connected.
5. discharge circuit according to claim 4, it is characterised in that: second control unit include the second triode and
Respectively with concatenated 4th resistance of second triode, the 5th resistance, the input terminal of the 4th resistance opens with the backlight
The output end of pass is electrically connected, and the output end of the 5th resistance is electric with the first control unit and the discharge cell respectively
Property connection, when second triode ON controls the conducting of the voltage-stabiliser tube.
6. discharge circuit according to claim 5, it is characterised in that: the collector of second triode and described first
The base stage of triode is electrically connected, and the base stage of second triode and the 4th resistance are electrically connected, the two or three pole
The transmitter of pipe and the 5th resistance are electrically connected.
7. discharge circuit according to claim 1, it is characterised in that: the electrolytic capacitor and the first control unit it
Between be equipped with Overvoltage protecting unit, the Overvoltage protecting unit is for preventing the first control unit from leading since input voltage is excessive
The damage of cause.
8. discharge circuit according to claim 7, it is characterised in that: the Overvoltage protecting unit include the 6th resistance and with
Concatenated 7th resistance of 6th resistance, the 7th resistance is equipped with overvoltage protection port, on the overvoltage protection port
It is electrically connected with overvoltage protector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821192264.1U CN208623327U (en) | 2018-07-25 | 2018-07-25 | Discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821192264.1U CN208623327U (en) | 2018-07-25 | 2018-07-25 | Discharge circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208623327U true CN208623327U (en) | 2019-03-19 |
Family
ID=65707441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821192264.1U Active CN208623327U (en) | 2018-07-25 | 2018-07-25 | Discharge circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208623327U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111243532A (en) * | 2020-01-16 | 2020-06-05 | 聚好看科技股份有限公司 | Backlight control method and display device |
| CN113744695A (en) * | 2021-08-04 | 2021-12-03 | 青岛鼎信通讯股份有限公司 | Low-cost LED backlight control circuit applied to station terminal |
-
2018
- 2018-07-25 CN CN201821192264.1U patent/CN208623327U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111243532A (en) * | 2020-01-16 | 2020-06-05 | 聚好看科技股份有限公司 | Backlight control method and display device |
| CN113744695A (en) * | 2021-08-04 | 2021-12-03 | 青岛鼎信通讯股份有限公司 | Low-cost LED backlight control circuit applied to station terminal |
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