CN216122650U - Long-life television switch power supply control panel - Google Patents
Long-life television switch power supply control panel Download PDFInfo
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- CN216122650U CN216122650U CN202122216307.3U CN202122216307U CN216122650U CN 216122650 U CN216122650 U CN 216122650U CN 202122216307 U CN202122216307 U CN 202122216307U CN 216122650 U CN216122650 U CN 216122650U
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Abstract
The utility model relates to the technical field of television switching power supplies, in particular to a television switching power supply control panel with long service life, which controls the on-off of the power supply of a correction control module by arranging a power supply control module and a switching power tube protection module, thereby avoiding the damage of instantaneous heavy current to a switching power tube in the switching process of a television power supply, and preventing the problems of overload, overvoltage and the like by matching with the monitoring of output voltage and current in a voltage transformation control module, thereby prolonging the service life of the television switching power supply control panel.
Description
Technical Field
The utility model relates to the technical field of television switching power supplies, in particular to a television switching power supply control panel with long service life.
Background
The existing television switching power supply is basically composed of four parts, namely input, transformation, output and power supply control, a PFC power factor correction module is additionally arranged to drive the transformation and boosting at present in order to enable the power and voltage output to be more accurate, however, in the transformation structure, a switching power tube exists, and in the television switching on and off process, instantaneous large current can damage the switching power tube, so that the total service life of the switching power supply is reduced.
Disclosure of Invention
The utility model provides a television switch power supply control panel with long service life, which is characterized in that a power supply control module and a switch power tube protection module are arranged to control the on and off of the power supply of a correction control module, so that the damage of instantaneous heavy current to a switch power tube is avoided in the switching process of a television power supply, and the problems of overload, overvoltage and the like are prevented by monitoring the output voltage and current in a voltage transformation control module, so that the service life of the television switch power supply control panel is longer.
In order to solve the technical problems, the utility model adopts the following technical scheme: a long-life television switch power supply control panel comprises a main control panel and a switch power supply circuit arranged on the main control panel, wherein the switch power supply circuit comprises an input rectification module, a boosting module, a voltage transformation control module, an output module, a correction control module and a time sequence output control module; the switching power supply circuit further comprises a power supply control module and a switching power tube protection module, wherein the voltage transformation control module comprises a power supply manager U1, a transformer TB901, a feedback unit and a PWM (pulse width modulation) driving unit, the output end of the boosting module is input to the output module after being transformed by the transformer TB901, the feedback unit is used for feeding back the output voltage of the output module to the power supply manager U1, and the PWM driving unit is used for generating a PWM signal to the power supply end of the power supply manager U1;
the boost module comprises a switching power tube Q1, an inductor L1, a diode D1 and a capacitor C1, the output end of the input rectifying module is connected with the switching end of the switching power tube Q1 after passing through the inductor L1, the control end of the switching power tube Q1 is connected with the output end of the correction control module, the capacitor C1 is connected with the first load unit in parallel, and the inductor L1 is connected with the capacitor C1 after passing through a diode D1;
the power supply control module comprises a triode Q4 and a switch unit, the triode Q4 supplies power to the correction control module after being switched on, the time sequence output control module is used for controlling the switching-on and switching-off of the switch unit, and the switch unit is used for controlling the switching-on and switching-off of the triode Q4;
the input end of the switching power tube protection module is connected with the input end of the input rectification module, and the switching power tube protection module is used for disconnecting or connecting the power supply of the correction control module.
Further, the switching power tube protection module comprises a detection unit, a comparison unit, a selection unit and a triode Q3; the input end of the detection unit is connected with the input end of the input rectification module, the output end of the detection unit is connected with the input end of the comparison unit, the comparison unit is used for comparing the voltage of the detection unit and outputting the comparison result to the selection unit, the selection unit is used for controlling the conduction and the cut-off of the triode Q3 according to the comparison result of the comparison unit, and the triode Q3 is used for disconnecting or connecting the power supply of the correction control module.
Further, the power supply control module includes opto-coupler U1B, triode Q4 and triode Q5, triode Q5's base with the output of timing output control module is connected, triode Q5's collecting electrode and opto-coupler U1B's emitting diode are established ties, triode Q5's projecting pole ground connection, opto-coupler U1B's phototriode and collecting electrode and triode Q4's base are connected, external power source is connected to triode Q4's projecting pole, triode Q4's collecting electrode and triode Q3's projecting pole are connected, triode Q3's collecting electrode with correction control module's feed end is connected.
Further, the comparing unit comprises a comparator U7A and a reference part for providing a reference voltage for the comparator U7A, and the output end of the detecting unit is connected with the positive input end of the comparator U7A;
the selection unit comprises a triode Q2 and a voltage division part, the base electrode of the triode Q2 is connected with the output end of the comparator U7A, the collector electrode of the triode Q2 is connected with the base electrode of the triode Q3, the collector electrode of the triode Q3 is connected with the power supply control module, and the voltage division end of the voltage division part is connected with the base electrode of the triode Q3.
Further, the detection unit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with the input end of the input rectification module, the other end of the resistor R1 is grounded through a resistor R2, and the other end of the resistor R1 is connected with the positive input end of a comparator U7A.
Furthermore, the voltage division part comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with an external power supply voltage, the other end of the resistor R3 is grounded after passing through a resistor R4, and the other end of the resistor R3 is connected with the reverse input end of the comparator U7A.
Further, the correction control module adopts a control chip with model number NCP 1608B.
Furthermore, the television switch power supply control panel further comprises a plurality of secondary control panels and a synchronous voltage reduction module arranged on the secondary control panels, wherein the synchronous voltage reduction module is used for reducing the output voltage of the output module.
The utility model has the beneficial effects that:
according to the television switch power supply control panel with long service life, the power supply control module and the switch power tube protection module are arranged to control the on and off of the power supply of the correction control module, so that in the switching process of a television power supply, the damage of instantaneous heavy current to a switch power tube is avoided, and the problems of overload, overvoltage and the like are prevented by monitoring output voltage and current in the transformation control module, so that the service life of the television switch power supply control panel is longer.
Drawings
FIG. 1 is a signal diagram of the present invention;
FIG. 2 is a schematic diagram of the circuit of the present invention;
FIG. 3 is a schematic circuit diagram of the output module and the voltage transformation control module according to the present invention;
FIG. 4 is a schematic circuit diagram of the power supply control module and the switching power tube protection module of the present invention;
FIG. 5 is a schematic circuit diagram of the synchronous buck module of the present invention;
fig. 6 is a schematic structural diagram of the main control board and the sub-control board of the present invention.
The reference numerals in fig. 1 to 6 include:
the device comprises a 1-input rectifying module, a 2-boost module, a 3-correction control module, a 4-time sequence output control module, a 5-power supply control module, a 6-switch power tube protection module, a 7-first load unit, an 8-detection unit, a 9-comparison unit, a 10-selection unit, an 11-output module, a 12-feedback unit, a 13-PWM driving unit, a 14-synchronous buck module, a 15-main control panel and a 16-secondary control panel.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.
The television switching power supply control panel of the embodiment, as shown in fig. 1 to fig. 3, includes a main control panel 15 and a switching power supply circuit arranged on the main control panel 15, where the switching power supply circuit includes an input rectification module 1, a boost module 2, a voltage transformation control module, an output module 11, a correction control module 3, and a time sequence output control module 4, the input rectification module 1 is connected to a commercial power, the input rectification module 1, the boost module 2, the voltage transformation control module, and the output module 11 are sequentially connected, and the correction control module 3 is used for driving the boost module 2 to work; the switching power supply circuit further comprises a power supply control module 5 and a switching power tube protection module 6, the voltage transformation control module comprises a power supply manager U1, a transformer TB901, a feedback unit 12 and a PWM driving unit 13, the output end of the voltage boosting module 2 is input to the output module 11 after being transformed by the transformer TB901, the feedback unit 12 is used for feeding back the output voltage of the output module 11 to the power supply manager U1, and the PWM driving unit 13 is used for generating a PWM signal to the power supply end of the power supply manager U1.
The signal block diagram of this embodiment is shown in fig. 1, and this embodiment controls the on/off of the power supply of the correction control module 3 by setting the power supply control module 5 and the switching power tube protection module 6, so that in the switching process of the television power supply, the damage to the switching power tube by the instantaneous large current is avoided, and the problems of overload, overvoltage and the like are prevented by cooperating with the monitoring of the output voltage and current in the voltage transformation control module, so that the service life of the television switching power supply control board can be longer. The input rectification module 1 and the time sequence output control module 4 are both in the prior art, and the correction control module 3 preferably adopts a control chip with the model number of NCP 1608B.
The boost module 2 includes a switching power tube Q1, an inductor L1, a diode D1, and a capacitor C1, an output end of the input rectifying module 1 passes through the inductor L1 and then is connected to a switching end of the switching power tube Q1, a control end of the switching power tube Q1 is connected to an output end of the calibration control module 3, the capacitor C1 is connected to the first load unit 7 in parallel, and the inductor L1 passes through the diode D1 and then is connected to the capacitor C1.
As shown in fig. 4, which is a schematic circuit diagram of the switching power tube protection module 6, an output terminal of the input rectification module 1 is connected to a switching terminal of a switching power tube Q1 after passing through an inductor L1, a control terminal of the switching power tube Q1 is connected to the calibration control module 3, a capacitor C1 is connected in parallel to the first load unit 7, and an inductor L1 is connected to a capacitor C1 after passing through a diode D1; the comparison unit 96 comprises a comparator U7A and a reference part for providing a reference voltage for the comparator U7A, an input terminal of the detection unit 8 is connected with an input terminal of the input rectification module 1, and an output terminal of the detection unit 8 is connected with a positive input terminal of the comparator U7A; the selection unit 10 comprises a triode Q2 and a voltage division part, the base of the triode Q2 is connected with the output end of the comparator U7A, the collector of the triode Q2 is connected with the base of the triode Q3, the collector of the triode Q3 is connected with the power supply control module 5, and the voltage division end of the voltage division part is connected with the base of the triode Q3. The correction control module 3 is a PFC driver chip, such as NCP1608P, NCP1608B, and the timing output control module 4 is a conventional technology, which is not described in detail in this embodiment.
Fig. 4 shows a specific circuit schematic diagram of the power supply control module 5, where the power supply control module 5 includes an optocoupler U1B, a transistor Q4, and a transistor Q5, a base of the transistor Q5 is connected to an output terminal of the timing output control module 4, a collector of the transistor Q5 is connected in series with a light emitting diode of the optocoupler U1B, an emitter of the transistor Q5 is grounded, a collector of the phototriode of the optocoupler U1B is connected to a base of the transistor Q4, an emitter of the transistor Q4 is connected to an external power supply, a collector of the transistor Q4 is connected to an emitter of the transistor Q3, and a collector of the transistor Q3 is connected to a power supply terminal of the correction control module 3. That is, when the timing output control module 4 outputs the working timing sequence to turn on the transistor Q5, the light emitting diode of the optocoupler U1B is turned on to emit light, so that the phototriode of the optocoupler U1B is turned on and the base voltage of the transistor Q4 is pulled down, the transistor Q4 is turned on, and then the transistor Q3 is turned on, so that the calibration control module 3 can be normally supplied with power through VCCO, and starts to work. Therefore, the transistor Q3 and the transistor Q4 of the present embodiment are the main control units for controlling the operation of the calibration control module 3, and the transistor Q3 is the main structure of the protection switch power transistor Q1.
The specific working principle of the switching power tube protection module 6 of this embodiment is as follows:
as shown in fig. 2 and 4, first, the inductor L1, the diode D50, the capacitor C1, and the switching power tube Q1 are commonly used in the boost module 2, and when the switching power tube Q1 is turned on, the inductor L1 is charged by the dc high voltage Vd input and rectified by the rectifier module 1, so that the current of the inductor L1 is increased until the switching power tube Q1 is turned off, and at this time, the voltage across the inductor L1 is inverted, the diode D1 is turned on by superimposing the dc high voltage Vd, and the inductor L1 starts to discharge the capacitor C1 until the current across the inductor L1 is zero. When the current of the inductor L1 is zero, the switching power tube Q1 is turned on again, the inductor L1 is charged again until the switching power tube Q1 is turned off again, and the following of the current and the voltage of the circuit is realized repeatedly, so that the distortion phenomenon of the current after the power factor correction is avoided effectively while the phases of the current and the voltage are kept consistent. Further, the thermistor RT901 is connected to the output end of the diode D1, so that it can be prevented that the switching power supply of the present embodiment is damaged due to the operation of the boost module 2 when the temperature is too high, and the use of the thermistor RT901 is the prior art.
Therefore, the switching power transistor Q1 is an important device for keeping the current and voltage phases of the circuit consistent, and the switching power transistor Q1 protection module of the embodiment avoids the switching power transistor Q1 from being damaged by transient current and overshoot voltage in the process of switching the power supply, and the specific principle is as follows: when the television is normally turned on, the detection unit 8 consisting of the resistor R1 and the resistor R2 detects the input AC voltage of the television switching power supply, the input AC voltage is divided by the resistor R1 and the resistor R2 and then is input to the comparator U7A, at this time, the comparator U7A outputs a high level, the base of the triode Q2 is the high level to enable the triode Q2 to be conducted and grounded, the charge stored in the capacitor C3 is released through the triode Q2, and meanwhile, the base voltage of the triode Q3 is pulled low to enable the triode Q3 to be cut off, so the power supply control module 5 of the correction control module 3 of the television switching power supply normally supplies power to the correction control module 3, and the correction control module 3 normally works; when the television is turned off, the detection unit 8 detects that the input AC voltage of the lcd television switching power supply is lower than a set value, and at this time, the comparator U7A outputs a low level to cut off the transistor Q2, so that the power supply Voltage (VCC) of the lcd television switching power supply charges the capacitor C3 through the resistor R6, and after a slight delay, the base of the transistor Q3 is a high voltage to make the transistor Q3 grounded, which leads to the grounding of the power supply control module 5 of the calibration control module 3 of the lcd television switching power supply, i.e., the power supply control module 5 receives a change of a signal, thereby cutting off the power supply of the calibration control module 3, so that the driving waveform of the calibration control module 3 disappears, and the driving duty ratio cannot be expanded to the maximum state; therefore, if the television is turned on again at this time, the power supply control module 5 supplies power to the calibration control module 3 again, and the soft start carried in the calibration control module 3 forces the driving duty ratio to be increased from small to large, thereby reducing the instantaneous current flowing through the switching power tube Q1 and the overshoot voltage (instantaneous peak voltage) of the switching power tube Q1, so that the instantaneous current flowing through the switching power tube Q1 and the overshoot voltage of the switching power tube Q1 during frequent switching are reduced in this embodiment, and the switching power supply of the television can select the switching power tube Q1 with lower withstand voltage and lower withstand current.
As shown in fig. 3, which is a schematic circuit diagram of the voltage transformation control module and the output module 11 of this embodiment, the voltage transformation control module includes a power manager U1, a transformer TB901, a feedback unit 12, and a PWM driving unit 13, an output end of the voltage boosting module 2 is transformed by the transformer TB901 and then input to the output module 11, the feedback unit 12 is configured to feed back an output voltage of the output module 11 to the power manager U1, and the PWM driving unit 13 is configured to generate a PWM signal to a power supply end of the power manager U1, where a specific connection manner is shown in fig. 3 and is not described herein. The boosted voltage V _ PFC of the boost module 2 outputs 12V voltage after being subjected to voltage transformation of the transformer TB901 and voltage transformation filtering of the output module 11, the feedback unit 12 feeds back the output voltage of the output module 11 to the power manager U1 in real time through a plurality of triodes and an optocoupler U1A, so that the output voltage of the output module 11 is monitored in real time through the power manager U1, and functional protection such as overload, overvoltage, undervoltage and the like is realized, and the power manager U1 preferably adopts a management chip with the model of NCP 1236. The PWM driving unit 13 is in the prior art, and each of the FLYBACK switching power supplies has this functional module, which is not described herein again.
Further, as shown in fig. 5 and fig. 6, the present embodiment is further provided with a plurality of secondary control boards 16 and a synchronous buck module 14 disposed on the secondary control boards 16, and the synchronous buck module 14 converts the 12V output of the output module 11 into voltages of 3.3V and 5V required by the components and the chip. Set up synchronous voltage reduction module 14 into the structure with main control panel 15 detachable, because all need synchronous voltage reduction module 14 in every switching power supply, and synchronous voltage reduction module 14's functional principle is similar, so establish it into independent modular structure, be convenient for be connected its main control panel 15 with different switching power supplies, and need not set up fixed synchronous voltage reduction module 14 on every main control panel 15, make the use of this embodiment more nimble, when synchronous voltage reduction module 14 appears damaging, also can change alone or maintain, the practicality is higher. The detachable connection structure of the secondary control board 16 and the main control board 15 can be in a screw connection mode, or can be connected between the secondary control board 16 and the main control board 15 in a mode that a convex block is arranged on the secondary control board 16 and then connected with the main control board 15 in a clamping mode. The specific circuit principle of the synchronous buck module 14 is shown in fig. 5, a 12V voltage is converted into 3.3V or 5V by a buck controller U1, the model of the buck controller U1 is preferably SY8113I, and the specific buck principle of the synchronous buck module 14 is the prior art.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (8)
1. A long-life television switch power supply control panel comprises a main control panel and a switch power supply circuit arranged on the main control panel, wherein the switch power supply circuit comprises an input rectification module, a boosting module, a voltage transformation control module, an output module, a correction control module and a time sequence output control module; the method is characterized in that: the switching power supply circuit further comprises a power supply control module and a switching power tube protection module, wherein the voltage transformation control module comprises a power supply manager U1, a transformer TB901, a feedback unit and a PWM (pulse width modulation) driving unit, the output end of the boosting module is input to the output module after being transformed by the transformer TB901, the feedback unit is used for feeding back the output voltage of the output module to the power supply manager U1, and the PWM driving unit is used for generating a PWM signal to the power supply end of the power supply manager U1;
the boost module comprises a switching power tube Q1, an inductor L1, a diode D1 and a capacitor C1, the output end of the input rectifying module is connected with the switching end of the switching power tube Q1 after passing through the inductor L1, the control end of the switching power tube Q1 is connected with the output end of the correction control module, the capacitor C1 is connected with the first load unit in parallel, and the inductor L1 is connected with the capacitor C1 after passing through a diode D1;
the power supply control module comprises a triode Q4 and a switch unit, the triode Q4 supplies power to the correction control module after being switched on, the time sequence output control module is used for controlling the switching-on and switching-off of the switch unit, and the switch unit is used for controlling the switching-on and switching-off of the triode Q4;
the input end of the switching power tube protection module is connected with the input end of the input rectification module, and the switching power tube protection module is used for disconnecting or connecting the power supply of the correction control module.
2. A long-life television switching power supply control board according to claim 1, characterized in that: the switching power tube protection module comprises a detection unit, a comparison unit, a selection unit and a triode Q3; the input end of the detection unit is connected with the input end of the input rectification module, the output end of the detection unit is connected with the input end of the comparison unit, the comparison unit is used for comparing the voltage of the detection unit and outputting the comparison result to the selection unit, the selection unit is used for controlling the conduction and the cut-off of the triode Q3 according to the comparison result of the comparison unit, and the triode Q3 is used for disconnecting or connecting the power supply of the correction control module.
3. A long-life television switching power supply control board according to claim 2, characterized in that: the power supply control module comprises an optocoupler U1B, a triode Q4 and a triode Q5, the base of the triode Q5 is connected with the output end of the time sequence output control module, the collector of the triode Q5 is connected with a light emitting diode of the optocoupler U1B in series, the emitter of the triode Q5 is grounded, the phototriode of the optocoupler U1B is connected with the base of the triode Q4, the emitter of the triode Q4 is connected with an external power supply, the collector of the triode Q4 is connected with the emitter of the triode Q3, and the collector of the triode Q3 is connected with the power supply end of the correction control module.
4. A long-life television switching power supply control board according to claim 2, characterized in that: the comparison unit comprises a comparator U7A and a reference part for providing reference voltage for the comparator U7A, and the output end of the detection unit is connected with the positive input end of the comparator U7A;
the selection unit comprises a triode Q2 and a voltage division part, the base electrode of the triode Q2 is connected with the output end of the comparator U7A, the collector electrode of the triode Q2 is connected with the base electrode of the triode Q3, the collector electrode of the triode Q3 is connected with the power supply control module, and the voltage division end of the voltage division part is connected with the base electrode of the triode Q3.
5. The long-life television switching power supply control board according to claim 4, wherein: the detection unit comprises a resistor R1 and a resistor R2, one end of the resistor R1 is connected with the input end of the input rectifying module, the other end of the resistor R1 is grounded through a resistor R2, and the other end of the resistor R1 is connected with the positive input end of a comparator U7A.
6. The long-life television switching power supply control board according to claim 4, wherein: the voltage division part comprises a resistor R3 and a resistor R4, one end of the resistor R3 is connected with an external power supply voltage, the other end of the resistor R3 is grounded after passing through a resistor R4, and the other end of the resistor R3 is connected with the reverse input end of a comparator U7A.
7. A long-life television switching power supply control board according to claim 1, characterized in that: the correction control module adopts a control chip with model number NCP 1608B.
8. A long-life television switching power supply control board according to claim 1, characterized in that: the television switch power supply control panel further comprises a plurality of secondary control panels and a synchronous voltage reduction module arranged on the secondary control panels, and the synchronous voltage reduction module is used for reducing the output voltage of the output module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122216307.3U CN216122650U (en) | 2021-09-13 | 2021-09-13 | Long-life television switch power supply control panel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122216307.3U CN216122650U (en) | 2021-09-13 | 2021-09-13 | Long-life television switch power supply control panel |
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| CN216122650U true CN216122650U (en) | 2022-03-22 |
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| CN202122216307.3U Active CN216122650U (en) | 2021-09-13 | 2021-09-13 | Long-life television switch power supply control panel |
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