CN209328495U - Soft start circuit, backlight circuit, circuit board and display - Google Patents
Soft start circuit, backlight circuit, circuit board and display Download PDFInfo
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- CN209328495U CN209328495U CN201920229013.4U CN201920229013U CN209328495U CN 209328495 U CN209328495 U CN 209328495U CN 201920229013 U CN201920229013 U CN 201920229013U CN 209328495 U CN209328495 U CN 209328495U
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Abstract
The utility model discloses a soft start circuit, circuit in a poor light, circuit board and display. The soft start circuit includes: the constant current control chip, the first compensation circuit and the second compensation circuit; the first compensation circuit is connected with a comparison voltage port COMP of the constant current control chip and used for adjusting the voltage change speed of the comparison voltage port COMP; the second compensation circuit is connected with the comparison voltage port COMP and used for adjusting the voltage change speed of the comparison voltage port COMP together with the first compensation circuit when the constant current control chip is started; when the voltage of the comparison voltage port COMP reaches a stable value, the second compensation circuit is disconnected from the comparison voltage port COMP, the problem that capacitance values in the compensation circuit are difficult to select is solved, the capacitance in the compensation circuit is dynamically adjusted according to a power-on state, and therefore the working performance of the equipment is improved.
Description
Technical field
The utility model embodiment be related to power technology more particularly to a kind of soft starting circuit, backlight circuit, circuit board and
Display.
Background technique
Existing chip is standing to be equipped with comparison voltage pin (COMP pin) in order to achieve the purpose that closed-loop control.This ratio
Compared with voltage pin, often it is connected with resistance capacitance and forms compensation circuit, to carry out closed-loop control.But inventor is realizing this reality
With it is novel when, discovery the prior art have following defects that the size value of the capacitor at comparison voltage pin will affect equipment
Using effect is illustrated by taking television set as an example.If capacitor acquirement is too big, television set is become in input, output signal
When change, ring speed change degree is slow, and voltage regulation factor is caused to be deteriorated, and then influences television set viewing effect；If at comparison voltage pin
Capacitor obtain smaller, there are current over pulse when booting, there is the risk of damage television screen.
Utility model content
The utility model provides a kind of soft starting circuit, backlight circuit, circuit board and display, to realize according to booting shape
Capacitor in state dynamic adjustment compensation circuit, and then improve equipment working performance.
In a first aspect, the utility model embodiment provides a kind of soft starting circuit, which includes:
Current constant control chip, the first compensation circuit and the second compensation circuit；
First compensation circuit is connect with the comparison voltage port COMP of the current constant control chip, described for adjusting
The voltage change speed of comparison voltage port COMP；
The second compensation circuit connection is connect with the comparison voltage port COMP, in the current constant control chip
When starting, the voltage change speed of the comparison voltage port COMP is adjusted jointly with first compensation circuit；
When the voltage of the comparison voltage port COMP reaches stationary value, second compensation circuit is electric compared with described
Pressure side mouth COMP is disconnected.
Further, first compensation circuit is the combinational circuit of capacitor and resistance；
Wherein, the capacitor in the combinational circuit is charged by the comparison voltage port COMP, to adjust the comparison
The voltage change speed of voltage port COMP.
Further, first compensation circuit includes: capacitor C812, capacitor C805 and resistance R804；
The capacitor C812 is set between the comparison voltage port COMP and ground terminal GND；
The capacitor C805 connects the cascaded structure to be formed with resistance R804, in parallel with the capacitor C812.
Further, second compensation circuit includes:
Switching circuit, capacitor E803 and diode D805；
After the capacitor E803 and diode D805 forward direction are connected, it is set to the comparison voltage port COMP and ground terminal
Between GND, the anode of the diode D805 is connect with the comparison voltage port COMP, the switching circuit and the capacitor
E803 is in parallel；
In current constant control chip starting, the switching circuit shutdown, the comparison voltage port COMP is described
Capacitor E803 charging, to adjust the voltage change speed of the comparison voltage port COMP；
When the voltage of the comparison voltage port COMP reaches stationary value, the voltage of the capacitor E803 is greater than described steady
Definite value, the diode D805 cut-off, second compensation circuit and the comparison voltage port COMP are disconnected；
When the current constant control chip is closed, the switching circuit conducting, for discharging the capacitor E803.
Further, the switching circuit includes:
Switching voltage input terminal, triode Q802, resistance R842 and resistance R843；
The resistance R842 and resistance R843 connect after forming bleeder circuit, are set to the switching voltage input terminal and connect
Between ground terminal GND；
The press bond that divides of the base stage of the triode Q802 and the bleeder circuit, collector and the ground terminal GND
Connection, emitter are connect with the cathode of the diode D805；
The current constant control chip starting when, the output voltage of the switching voltage input terminal through the bleeder circuit at
After reason, end the triode Q802；
In current constant control chip starting, work that the triode Q802 is provided based on the switching voltage input terminal
Make voltage cut-off；
When the current constant control chip is closed, the triode Q802 conducting, for being put to the capacitor E803
Electricity.
Further, the switching circuit further include: current-limiting resistance R841；
The current-limiting resistance R841 be set to the triode Q802 emitter and the diode D805 cathode it
Between.
Further, capacitor C811 is provided between the base stage and collector of the triode Q802.
Further, the capacitor E803 is polar capacitor, and the cathode of the capacitor E803 and the ground terminal GND connect
It connects.
Second aspect, the utility model embodiment additionally provide a kind of backlight circuit, which includes first aspect
In a kind of any soft starting circuit.
The third aspect, the utility model embodiment additionally provide a kind of circuit board, which includes institute in second aspect
A kind of backlight circuit stated.
Fourth aspect, the utility model embodiment additionally provide a kind of display, which includes described in the third aspect
A kind of circuit board.
The utility model includes: current constant control chip, the first compensation circuit and the second compensation by the way that soft starting circuit is arranged
Circuit；First compensation circuit is connect with the comparison voltage port COMP of the current constant control chip, for adjusting the ratio
Voltage change speed compared with voltage port COMP；The second compensation circuit connection is connect with the comparison voltage port COMP,
For adjusting the comparison voltage port COMP's jointly with first compensation circuit in current constant control chip starting
Voltage change speed；The comparison voltage port COMP voltage reach stationary value when, second compensation circuit with it is described
Comparison voltage port COMP is disconnected, and solves the problems, such as to realize because capacitance is difficult to choose in compensation circuit according to open state
Capacitor in dynamic adjustment compensation circuit, and then improve equipment working performance.
Detailed description of the invention
Fig. 1 is the electrical block diagram of soft starting circuit provided by the embodiment of the utility model；
Fig. 2 is the enlarged drawing in Fig. 1 at A；
Fig. 3 is the enlarged drawing in Fig. 1 at B.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
Fig. 1 is the electrical block diagram of soft starting circuit provided by the embodiment of the utility model, and Fig. 2 is in Fig. 1 at A
Enlarged drawing, Fig. 3 are the enlarged drawing in Fig. 1 at B.The present embodiment is applicable to the technical field of backlight circuit.Wherein, backlight circuit
It is generally integrated in display, for providing backlight function for display.In order to guarantee the stability of backlight display, need to utilize
Current constant control chip works under constant current to adjust backlight lamp bar in backlight circuit.In general, current constant control chip passes through detection
The electric current of backlight lamp bar adjusts output pulse-modulated signal, the impulse modulation as feedback signal, and then according to the feedback signal
Signal is used to control the conducting situation of the transistor in backlight circuit, to achieve the effect that control constant current.
Further, the current constant control chip in the present embodiment carries out current constant control by the way of loop control.In ring
In the mode of road control, the duty ratio of pulse-modulated signal is subjected to compensation for the influence of circuit, which is set to constant current control
The comparison voltage port COMP of coremaking piece.That is, (or being drawn by reducing with comparison voltage port COMP for comparison voltage
Foot COMP) connection compensation circuit capacitance, increase comparison voltage port COMP voltage change speed, pulse can be increased
The duty ratio of modulated signal, so that the pace of change for flowing through the electric current of backlight lamp bar is improved, to be rapidly achieved constant current state.
The overshoot current damage backlight circuit generated when it should be noted that being switched in order to prevent, needs to avoid to compensate
Capacitance in circuit is chosen excessive.
In order to guarantee to reduce influence of the overshoot current to backlight circuit in booting moment, and can after powering, backlight electricity
In road rapid operation and constant current state, the present embodiment provides a kind of soft starting circuits.Referring to FIG. 1, FIG. 2 and FIG. 3, soft start electricity
Road is specifically included such as flowering structure: current constant control chip, the first compensation circuit and the second compensation electricity.
First compensation circuit is connect with the comparison voltage port COMP of the current constant control chip, described for adjusting
The voltage change speed of comparison voltage port COMP.
The second compensation circuit connection is connect with the comparison voltage port COMP, in the current constant control chip
When starting, the voltage change speed of the comparison voltage port COMP is adjusted jointly with first compensation circuit.
When the voltage of the comparison voltage port COMP reaches stationary value, second compensation circuit is electric compared with described
Pressure side mouth COMP is disconnected.
Workflow to soft starting circuit is carried out citing detailed description by the present embodiment.The present embodiment to current constant control chip not
It limits, applicable for the scene for needing compensation circuit to carry out closed-loop control, for clarity, the present embodiment is to show
It is illustrated for backlight circuit in device.
It is opened moment in display, the starting of current constant control chip, while the second compensation circuit works, since second mends at this time
It repays circuit and the first compensation circuit adjusts the voltage change speed of comparison voltage port COMP jointly, the output of current constant control chip
The lesser pulse-modulated signal of duty ratio, it is ensured that the curent change in backlight circuit is slow, to avoid the shadow of overshoot current
It rings.
After the starting of current constant control chip, the voltage of comparison voltage port COMP is gradually increasing, when comparison voltage port
When the voltage of COMP reaches stationary value, second compensation circuit and the comparison voltage port COMP are disconnected, by the first compensation
Circuit individually adjusts the voltage change speed of comparison voltage port COMP, the biggish pulse of duty ratio of current constant control chip output
Modulated signal, it is ensured that the curent change in backlight circuit is speeded, so that backlight circuit rapidly enters constant current operation state.
It should be noted that in the present embodiment, when the second compensation circuit and the first compensation circuit work together, compared to the
One compensation circuit works independently, and the voltage change speed of comparison voltage port COMP is slower.
The utility model includes: current constant control chip, the first compensation circuit and the second compensation by the way that soft starting circuit is arranged
Circuit；First compensation circuit is connect with the comparison voltage port COMP of the current constant control chip, for adjusting the ratio
Voltage change speed compared with voltage port COMP；The second compensation circuit connection is connect with the comparison voltage port COMP,
For adjusting the comparison voltage port COMP's jointly with first compensation circuit in current constant control chip starting
Voltage change speed；The comparison voltage port COMP voltage reach stationary value when, second compensation circuit with it is described
Comparison voltage port COMP is disconnected, and solves the problems, such as to realize because capacitance is difficult to choose in compensation circuit according to open state
Capacitor in dynamic adjustment compensation circuit, and then improve equipment working performance.
Based on the above technical solution, the present embodiment is not construed as limiting the specific implementation of the first compensation circuit.
In one embodiment, first compensation circuit is the combinational circuit of capacitor and resistance；
Wherein, the capacitor in the combinational circuit is charged by the comparison voltage port COMP, to adjust the comparison
The voltage change speed of voltage port COMP.
In one embodiment, first compensation circuit includes: capacitor C812, capacitor C805 and resistance R804；
The capacitor C812 is set between the comparison voltage port COMP and ground terminal GND；
The capacitor C805 connects the cascaded structure to be formed with resistance R804, in parallel with the capacitor C812.
Based on the above technical solution, the present embodiment is not construed as limiting the specific implementation of the second compensation circuit.
In one embodiment, second compensation circuit includes:
Switching circuit, capacitor E803 and diode D805.
After the capacitor E803 and diode D805 forward direction are connected, it is set to the comparison voltage port COMP and ground terminal
Between GND, the anode of the diode D805 is connect with the comparison voltage port COMP, the switching circuit and the capacitor
E803 is in parallel.
In current constant control chip starting, the switching circuit shutdown, the comparison voltage port COMP is described
Capacitor E803 charging, to adjust the voltage change speed of the comparison voltage port COMP.
When the voltage of the comparison voltage port COMP reaches stationary value, the voltage of the capacitor E803 is greater than described steady
Definite value, the diode D805 cut-off, second compensation circuit and the comparison voltage port COMP are disconnected.
When the current constant control chip is closed, the switching circuit conducting, for discharging the capacitor E803.
Based on the above technical solution, the present embodiment is not construed as limiting the specific implementation of switching circuit.
In one embodiment, the switching circuit includes:
Switching voltage input terminal, triode Q802, resistance R842 and resistance R843.
The resistance R842 and resistance R843 connect after forming bleeder circuit, are set to the switching voltage input terminal and connect
Between ground terminal GND.
The press bond that divides of the base stage of the triode Q802 and the bleeder circuit, collector and the ground terminal GND
Connection, emitter are connect with the cathode of the diode D805.
The current constant control chip starting when, the output voltage of the switching voltage input terminal through the bleeder circuit at
After reason, end the triode Q802.
In current constant control chip starting, work that the triode Q802 is provided based on the switching voltage input terminal
Make voltage cut-off.
When the current constant control chip is closed, the triode Q802 conducting, for being put to the capacitor E803
Electricity.
In one embodiment, the switching circuit further include: current-limiting resistance R841.
The current-limiting resistance R841 be set to the triode Q802 emitter and the diode D805 cathode it
Between.
In the present embodiment, capacitor C811 is provided between the base stage and collector of the triode Q802.
In the present embodiment, the capacitor E803 is polar capacitor, and the cathode of the capacitor E803 and the ground terminal GND connect
It connects.
Workflow to soft starting circuit is carried out citing detailed description by the present embodiment.The present embodiment to current constant control chip not
It limits, applicable for the scene for needing compensation circuit to carry out closed-loop control, for clarity, the present embodiment is to show
It is illustrated for backlight circuit in device.
Referring to FIG. 1, FIG. 2 and FIG. 3, it is opened moment in display, the starting of current constant control chip, while the second compensation circuit work
Make under 5V voltage.In the second compensation circuit, 5V voltage divides to obtain output voltage by resistance R842 and resistance R843 to be made
Triode Q802 cut-off is obtained, capacitor E803 is connect by diode D805 with the comparison voltage port COMP of current constant control chip.
In turn, the second compensation circuit and the first compensation circuit adjust the voltage change speed of comparison voltage port COMP jointly.Specifically,
Current constant control chip is by comparing the capacitor C812 and capacitor C805, the second compensation that voltage port COMP is in the first compensation circuit
Capacitor E803 charging in circuit, so that the voltage of comparison voltage port COMP is gradually increasing, the rate of climb is by capacitor
The influence of C812, capacitor C805 and capacitor E803.At this point, the lesser impulse modulation letter of the duty ratio of current constant control chip output
Number, it is ensured that the curent change in backlight circuit is slow, to avoid the influence of overshoot current.
After the starting of current constant control chip, the voltage of comparison voltage port COMP is gradually increasing, due to current constant control chip
There are overshoot voltages when U801 starts, and when in comparison voltage port, the voltage of COMP reaches stationary value, the voltage of capacitor E803 is big
In the stationary value.Further, due to the one-way of diode D805, diode D805 cut-off, so that the second compensation circuit
It is disconnected with comparison voltage port COMP, the voltage change speed of comparison voltage port COMP is individually adjusted by the first compensation circuit.
Specifically, current constant control chip is the capacitor C812 and capacitor C805 in the first compensation circuit by comparing voltage port COMP,
Due to there was only capacitor C812 and capacitor C805 effect, the rate of climb of the voltage of comparison voltage port COMP is relatively fast, at this point,
The biggish pulse-modulated signal of duty ratio of current constant control chip output, it is ensured that the curent change in backlight circuit is speeded,
So that backlight circuit rapidly enters constant current operation state.
Based on the above technical solution, the utility model embodiment additionally provides a kind of backlight circuit, backlight electricity
Road includes any a kind of soft starting circuit in above-described embodiment technical solution.
In the present embodiment, current constant control chip is provided with pulse-modulated signal output port, pulse-modulated signal output
Port is for exporting pulse-modulated signal.
Based on the above technical solution, the utility model embodiment additionally provides a kind of circuit board, the circuit board packet
Include a kind of backlight circuit described in above-described embodiment technical solution.
Based on the above technical solution, the utility model embodiment additionally provides a kind of display, the display packet
Include a kind of circuit board described in above-described embodiment technical solution.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (11)
1. a kind of soft starting circuit characterized by comprising
Current constant control chip, the first compensation circuit and the second compensation circuit；
First compensation circuit is connect with the comparison voltage port COMP of the current constant control chip, for adjusting the comparison
The voltage change speed of voltage port COMP；
The second compensation circuit connection is connect with the comparison voltage port COMP, for starting in the current constant control chip
When, adjust the voltage change speed of the comparison voltage port COMP jointly with first compensation circuit；
When the voltage of the comparison voltage port COMP reaches stationary value, second compensation circuit and the comparison voltage end
Mouth COMP is disconnected.
2. circuit according to claim 1, which is characterized in that first compensation circuit is the combination electricity of capacitor and resistance
Road；
Wherein, the capacitor in the combinational circuit is charged by the comparison voltage port COMP, to adjust the comparison voltage
The voltage change speed of port COMP.
3. circuit according to claim 2, which is characterized in that first compensation circuit includes: capacitor C812, capacitor
C805 and resistance R804；
The capacitor C812 is set between the comparison voltage port COMP and ground terminal GND；
The capacitor C805 connects the cascaded structure to be formed with resistance R804, in parallel with the capacitor C812.
4. circuit according to any one of claims 1 to 3, which is characterized in that second compensation circuit includes:
Switching circuit, capacitor E803 and diode D805；
After the capacitor E803 and diode D805 forward direction are connected, it is set to the comparison voltage port COMP and ground terminal GND
Between, the anode of the diode D805 is connect with the comparison voltage port COMP, the switching circuit and the capacitor
E803 is in parallel；
In current constant control chip starting, the switching circuit shutdown, the comparison voltage port COMP is the capacitor
E803 charging, to adjust the voltage change speed of the comparison voltage port COMP；
When the voltage of the comparison voltage port COMP reaches stationary value, the voltage of the capacitor E803 is greater than the stabilization
Value, the diode D805 cut-off, second compensation circuit and the comparison voltage port COMP are disconnected；
When the current constant control chip is closed, the switching circuit conducting, for discharging the capacitor E803.
5. circuit according to claim 4, which is characterized in that the switching circuit includes:
Switching voltage input terminal, triode Q802, resistance R842 and resistance R843；
The resistance R842 and resistance R843 connect after forming bleeder circuit, are set to the switching voltage input terminal and ground terminal
Between GND；
The base stage of the triode Q802 divides press bond with the bleeder circuit, and collector is connect with the ground terminal GND,
Emitter is connect with the cathode of the diode D805；
In current constant control chip starting, the output voltage of the switching voltage input terminal is handled through the bleeder circuit
Afterwards, end the triode Q802；
In current constant control chip starting, the triode Q802 is electric based on the work that the switching voltage input terminal provides
Pressure cut-off；
When the current constant control chip is closed, the triode Q802 conducting, for discharging the capacitor E803.
6. circuit according to claim 5, which is characterized in that the switching circuit further include: current-limiting resistance R841；
The current-limiting resistance R841 is set between the emitter of the triode Q802 and the cathode of the diode D805.
7. circuit according to claim 5, which is characterized in that be arranged between the base stage and collector of the triode Q802
There is capacitor C811.
8. circuit according to claim 4, which is characterized in that the capacitor E803 is polar capacitor, the capacitor E803
Cathode connect with the ground terminal GND.
9. a kind of backlight circuit, which is characterized in that including a kind of soft starting circuit described in any one of claims 1-8.
10. a kind of circuit board, which is characterized in that including a kind of backlight circuit as claimed in claim 9.
11. a kind of display, which is characterized in that including a kind of circuit board described in any one of claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920229013.4U CN209328495U (en) | 2019-02-20 | 2019-02-20 | Soft start circuit, backlight circuit, circuit board and display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920229013.4U CN209328495U (en) | 2019-02-20 | 2019-02-20 | Soft start circuit, backlight circuit, circuit board and display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209328495U true CN209328495U (en) | 2019-08-30 |
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ID=67732483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920229013.4U Active CN209328495U (en) | 2019-02-20 | 2019-02-20 | Soft start circuit, backlight circuit, circuit board and display |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564471A (en) * | 2020-11-27 | 2021-03-26 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Working sequence control circuit in two-stage conversion circuit and method thereof |
-
2019
- 2019-02-20 CN CN201920229013.4U patent/CN209328495U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112564471A (en) * | 2020-11-27 | 2021-03-26 | 国创新能源汽车智慧能源装备创新中心(江苏)有限公司 | Working sequence control circuit in two-stage conversion circuit and method thereof |
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