CN218243335U - Power supply multi-topology sequential control circuit - Google Patents
Power supply multi-topology sequential control circuit Download PDFInfo
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- CN218243335U CN218243335U CN202221495885.3U CN202221495885U CN218243335U CN 218243335 U CN218243335 U CN 218243335U CN 202221495885 U CN202221495885 U CN 202221495885U CN 218243335 U CN218243335 U CN 218243335U
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Abstract
The utility model provides a power multi-topology sequential control circuit, including standby switch control module, PFC work control module, PFC module and backlight module, standby switch control module includes first the control unit and second the control unit, and backlight module includes chip the control unit and the power output unit in a poor light, wherein: the PFC work control module is connected with the PFC module; the PFC module is connected with an external power supply and is also connected with a backlight power supply output unit of the backlight module; one end of a second control unit of the standby switch control module is connected with an external power supply, the other end of the second control unit is connected with a chip control unit, and the chip control unit is further connected with a backlight power supply output unit. The utility model provides a pair of many topological sequential control circuit of power can avoid when TV set power production test, and the supply voltage who applies power output unit in a poor light appears and does not reach appointed magnitude of voltage, and the condition of protection appears in power output unit in a poor light.
Description
Technical Field
The utility model relates to a TV power technical field, concretely relates to power multi-topology sequential control circuit.
Background
In the related art, the auxiliary power supply works to supply power to the television main board, and the television main board works to send out a power-on signal, wherein the power-on signal comprises a first control signal and a second control signal. The first control signal is output to the PFC work control module, and the second control signal is output to the standby switch control module. The PFC work control module receives the first control signal, generates a Power supply signal and supplies Power to a Power Factor Correction (PFC) module, the PFC module receives the Power supply signal and starts working and supplies Power to a backlight Power supply output unit of the backlight module, and the Power supply voltage applied to the backlight Power supply output unit is increased from zero to a specified voltage value. Meanwhile, the standby switch control module receives the second control signal and outputs a chip control signal to a chip control unit of the backlight module, and the chip control unit receives the chip control signal and controls the working state of the backlight power supply output unit. Under the condition that the television is normally used, the television mainboard can control the output sequence of the first control signal and the second control signal, so that the power supply voltage applied to the backlight power supply output unit reaches a specified voltage value, the standby switch control module outputs a chip control signal to the chip control unit of the backlight module, and the chip control unit controls the working state of the backlight power supply output unit. Therefore, the situation that the power supply voltage applied to the backlight power supply output unit does not reach the specified voltage value, the chip control unit controls the working state of the backlight power supply output unit, and the backlight power supply output unit is protected is avoided. However, during the television power supply production test, since the television main board does not control the output sequence of the first control signal and the second control signal, the power supply voltage applied to the backlight power supply output unit does not reach the specified voltage value, and the chip control unit controls the working state of the backlight power supply output unit, so that the backlight power supply output unit is protected. Therefore, the standby switch control module is required to output a chip control signal to the chip control unit in a delayed manner, so that when the chip control unit controls the working state of the backlight power output unit, the power supply voltage applied to the backlight power output unit reaches a specified voltage value, and the protection of the backlight power output unit is avoided.
SUMMERY OF THE UTILITY MODEL
In view of this, an embodiment of the present invention provides a power supply multi-topology sequential control circuit, which can avoid that when a television power supply is produced and tested, the power supply voltage applied to the backlight power output unit does not reach a specified voltage value, and the backlight power output unit is protected.
The utility model discloses an embodiment provides a power multi-topology sequential control circuit, including standby switch control module, PFC work control module, PFC module and backlight module, standby switch control module includes first the control unit and second the control unit, backlight module includes chip the control unit and backlight output unit, wherein: the PFC work control module is connected with the PFC module, receives a first control signal, generates a power supply signal and outputs the power supply signal to the PFC module; the PFC module is connected with an external power supply and is also connected with a backlight power supply output unit of the backlight module, and the PFC module receives the power supply signal and supplies power to the backlight power supply output unit; the first control unit of the standby switch control module receives the second control signal, generates a third control signal and outputs the third control signal to the second control unit; one end of the second control unit is connected with an external power supply, the other end of the second control unit is connected with the chip control unit of the backlight module, and after the external power supply is fully charged to the energy storage module in the second control unit, the second control unit outputs a chip control signal to the chip control unit of the backlight module under the combined action of the third control signal and the external power supply; in the process of charging the energy storage module, the power supply voltage of the backlight power supply output unit is increased to a specified voltage value; the chip control unit is also connected with the backlight power output unit, and the chip control unit receives the chip control signal and controls the working state of the backlight power output unit when the power supply voltage is increased to a specified voltage value.
The utility model discloses a power multi-topology sequential control circuit that embodiment provided, when the test was produced to the TV set power, first control signal and second control signal connected had first control signal and second control signal input always at external power supply to first control signal and second control signal's input does not have precedence. The PFC work control module receives the first control signal and generates a power supply signal to supply power to the PFC module, the PFC module receives the power supply signal and starts work to supply power to the backlight power supply output unit, and the voltage applied to the backlight power supply output unit is gradually increased from zero to a specified voltage value. Meanwhile, the first control unit of the standby switch control module receives the second control signal, generates a third control signal and outputs the third control signal to the second control unit, after the energy storage module in the second control module is fully charged by the external power supply, the second control unit outputs a chip control signal to the chip control unit of the backlight module under the combined action of the third control signal and the accessed external power supply, and then the chip control unit controls the backlight power supply output unit with the power supply voltage reaching the specified voltage value to work. The external power supply charges the energy storage module in the second control unit firstly, the second control unit outputs a chip control signal to the chip control unit after the external power supply is fully charged, and the energy storage module plays a role in delaying the second control unit to output the chip control signal. The utility model provides a pair of many topological sequential control circuit of power can avoid when TV set power production test, and the supply voltage who applies power output unit in a poor light appears and does not reach appointed magnitude of voltage, and the condition of protection appears in power output unit in a poor light.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a block diagram of a power supply multi-topology timing control circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a standby switch control module in a power supply multi-topology sequential control circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a PFC operation control module in a power supply multi-topology timing control circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an auxiliary power supply in a power supply multi-topology timing control circuit according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a standby switch control module in a power multi-topology timing control circuit in the related art.
Detailed Description
To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled person without creative work belong to the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a power supply multi-topology sequential control circuit, including a standby switch control module, a PFC working control module, a PFC module and a backlight module, wherein the standby switch control module includes a first control unit and a second control unit, the backlight module includes a chip control unit and a backlight output unit, wherein: the PFC work control module is connected with the PFC module, receives the first control signal, generates a power supply signal and outputs the power supply signal to the PFC module. In practice, the first control signal may be a backlight power control signal sent by a television motherboard when a television power supply is turned ON, or may be an external power supply directly connected to the television power supply during a factory test of the television power supply, and the first control signal may be represented by PS _ ON.
The PFC module is connected with an external power supply and is also connected with a backlight power supply output unit of the backlight module, and the PFC module receives the power supply signal and supplies power to the backlight power supply output unit. And the first control unit of the standby switch control module receives the second control signal, generates a third control signal and outputs the third control signal to the second control unit. In practice, the second control signal may be a standby switch signal sent by a main board of the television when the power supply of the television is turned ON, or may be an external power supply directly connected to the power supply when the power supply is subjected to factory test, and the second control signal may be represented by BL _ ON. One end of the second control unit is connected with an external power supply, which may be, for example, 220V commercial power, and the other end of the second control unit is connected with the chip control unit of the backlight module, after the energy storage module in the second control unit is fully charged by the external power supply, the second control unit outputs a chip control signal to the chip control unit of the backlight module under the combined action of the third control signal and the external power supply. In practice, the energy storage module may use a capacitor with a large capacitive reactance value as a function, and the third control signal may be an optical signal sent from a photodiode in the optical coupler to a phototransistor or a signal generated by a relay or the like. The chip control signal may be a high level signal that satisfies the chip operation in the chip control unit.
During the charging process of the energy storage module, the supply voltage of the backlight power output unit increases to a specified voltage value, for example, the supply voltage of the backlight power output unit increases from 0V to 390V. The chip control unit is also connected with the backlight power output unit, and the chip control unit receives the chip control signal and controls the working state of the backlight power output unit when the power supply voltage is increased to a specified voltage value.
In some application scenarios, for example, when a factory test of a television power supply is performed, the PFC operation control module receives a first control signal provided by an external power supply, generates a power supply signal, and outputs the power supply signal to the PFC module. The PFC module obtains a power supply signal to start working and supplies power to a backlight power supply output unit connected with the PFC module. In the process of supplying power to the backlight power output unit, the voltage applied to the backlight power output unit gradually increases from 0 to a specified voltage value, for example, set to 390V. The second control signal that external power source provided is received to standby switch control module's first control unit, BL _ ON promptly, when connecting through first opto-coupler between first control unit and the second control unit, the photodiode of first opto-coupler is luminous, and the phototriode switches ON, so first opto-coupler switches ON. The second control unit is connected to an external power supply, for example, 220V commercial power, the external power supply charges the energy storage module in the second control unit, for example, a capacitor with a large capacitive reactance value is charged, in the process of charging the energy storage module, the voltage applied to the backlight power output unit reaches a set 390V voltage, after the energy storage module in the second control unit is fully charged, the second control unit outputs a chip control signal to the chip control unit of the backlight module under the combined action of external power supply and conduction of the first optical coupler, and the chip control signal can be represented by LLC _ VCC. The chip control unit is started to work under the condition that LLC _ VCC is input, and the backlight power supply output unit connected with the chip control unit is controlled to work when the power supply voltage reaches 390V. The external power supply charges the energy storage module in the second control unit first, the energy storage module is full of electricity, the second control unit just outputs the chip control signal, the energy storage module plays the effect of delaying the second control unit and outputting the chip control signal, thereby avoiding that the voltage applied to the backlight power supply output unit does not reach 390V, and the chip control unit controls the backlight power supply output unit to work and the condition of protection appears.
As shown in fig. 2, the first control unit 101 and the second control unit 102 are connected by a first optical coupler PC 102. The first control unit 101 includes: a first resistor R154, a second resistor R155 and a first triode Q152; the first resistor R154 is connected in series with the second resistor R155, one end of the first resistor R154 is connected to an input end of the second control signal BL _ ON, that is, BL _ ON in the figure, and the other end is connected to the second resistor R155; first triode Q152 with second resistance R155 is parallelly connected, the base of first triode Q152 is connected the one end of second resistance R155, the projecting pole of first triode Q152 with the common ground connection of second resistance R155 other end, the collecting electrode of first triode Q152 passes through first opto-coupler PC102 is in connect power VCC1 in the first control unit.
In some application scenarios, for example, when a factory test of a television power supply is performed or the television power supply is turned ON, a first control signal input by an external power supply or a power-ON signal input by the television power supply may be represented by BL _ ON, the input BL _ ON is divided by a first resistor R154 and a second resistor R155 in series, a voltage divided by the second resistor R155 is a voltage applied to a base and an emitter of the first triode Q152, a collector of the first triode Q152 is connected to a low-voltage power supply through a first optocoupler PC102, for example, the power supply is a 12V power supply, the first triode Q152 is turned ON, and the first optocoupler PC102 is also turned ON.
In an optional utility model embodiment, in order to avoid the electric current too big to damage first opto-coupler PC102, increase third resistance R153 between the positive pole of first opto-coupler PC102 and the power. One end of the third resistor R153 is connected with a power supply, and the other end of the third resistor R153 is connected with an anode of the first optical coupler in the first control unit. In addition, in order to filter BL _ ON input to the first transistor Q152, a first capacitor C151 is added. Specifically, one end of the first capacitor C151 is connected to the base of the first transistor Q152, and the other end is grounded together with the emitter of the first transistor Q152 and the second resistor R155, that is, the first capacitor C151 is connected in parallel with the first transistor Q152 and the second resistor R155.
The second control unit 102 includes a second capacitor E151 and a second triode Q151, where the second capacitor E151 is used as an energy storage module of the second control unit 102, the collector of the first optocoupler PC102 is connected to an external power source VCC1 in the second control unit 102, the external power source may be 220V commercial power or 380V industrial production power, the collector of the first optocoupler PC102 is grounded through the second capacitor E151, and the ground is SGND. An emitter of the first optocoupler PC102 is connected with a base of the second triode Q151 in the second control unit 102, and an emitter of the second triode Q151 is connected with the chip control unit.
In some application scenarios, for example, when a television power supply is turned ON or a television power supply is subjected to a factory test, when the first control unit 101 receives BL _ ON, the first control unit 101 is turned ON, the first optocoupler PC102 is also turned ON, and the second control unit 102 is connected to an external power supply VCC1, where the external power supply VCC1 may be, for example, 220V commercial power or 380V power supply. After the external power supply is connected to the second control unit 102, the capacitor E151 is charged first, after the second capacitor E151 is fully charged, the external power supply is input to the base of the second triode Q151 through the phototriode of the first optocoupler PC102, and since the collector of the second triode Q151 is also connected to the external power supply, the second triode Q151 is turned on at this moment, and a chip control signal LLC _ VCC is output to the chip control unit of the backlight module to supply power to the chip control unit. The external power source VCC1 charges the second capacitor E151 in the second control unit 102, and the second capacitor E151 functions to delay the output of the chip control signal. For better time delay, the second capacitor E151 may be a capacitor with a large capacitive reactance value.
In other application scenarios, for example, when the power of the television is turned off, part of the television requires that the backlight module is turned off quickly, so that the chip control unit of the backlight module is required to stop working immediately when the television is turned off, and the second control unit 102 supplies power to the chip control unit of the backlight module, and if the second control unit 102 can stop outputting the chip control signal for the first time when the television is turned off, the chip control unit of the backlight module can stop working immediately. No signal is switched into the first control unit 101, the first control unit 101 is in a closed state, and the first optocoupler PC102 is also in a closed state. At this time, the second control unit 102 does not have the external power VCC1, although the second capacitor E151 stores electric energy, since the first optocoupler PC102 is turned off, the electric energy of the second capacitor E151 cannot be input to the base of the second triode Q151 through the first optocoupler PC102, so the second triode Q151 is in a disconnected state, the second control unit 102 does not generate the chip control signal LLC _ VCC, and the chip control unit of the backlight module immediately stops working without the input of the chip control signal. Therefore, the second control unit 102 can accelerate the power-off speed when the power of the television is turned off.
As shown in fig. 5, if the anode of the second capacitor E151 is connected to an external power source through the first optocoupler PC102, the anode of the second capacitor E151 is further connected to the base of the second triode Q151. When the television power supply is turned ON, the external power supply charges the second capacitor E151, and when the television power supply is turned off, the first control unit 101 cannot be turned ON without BL _ ON input, and the first optocoupler PC102 is also in an off state. Since the second capacitor E151 stores electric energy, it discharges to the base of the second transistor Q151. Meanwhile, the collector of the second transistor Q151 is always connected to the external power source, so the second transistor Q151 is still turned on, and outputs a chip control signal LLC _ VCC to the chip control unit of the backlight module to supply power to the chip control unit, and the backlight module of the television cannot be quickly turned off until the electric energy stored in the second capacitor E151 is exhausted.
In an optional embodiment, a fourth resistor R151 is added to the second control unit 102, so as to control the charging speed of the second capacitor E151 by an external power supply. Specifically, one end of the fourth resistor R151 and the collector of the second transistor Q151 are commonly connected to the external power source VCC1, the other end of the fourth resistor R151 is connected to the anode of the second capacitor E151, and the other end of the fourth resistor R151 is further connected to the collector of the first optocoupler PC 102. A current input from an external power source is input to the second capacitor E151 through the fourth resistor R151, and charges the second capacitor E151. The smaller the resistance of the fourth resistor R151 is, the larger the current when the external power supply charges the second capacitor E151, and the shorter the length required for fully charging the second capacitor E151. On the contrary, the larger the resistance of the fourth resistor R151 is, the smaller the current charged to the second capacitor E151 by the external power source through the fourth resistor R151 is, the longer the time required for the second capacitor E151 to be fully charged is, and the longer the time for delaying the output of the chip control signal is, which can further ensure that the power supply voltage applied to the backlight power output unit reaches the specified voltage value when the chip control unit controls the backlight power output unit to operate. In addition, in order to filter the chip control signal output from the second control unit 102, a third capacitor C152 is added. One end of the third capacitor C152 is connected to the emitter of the second transistor Q151, and the other end is grounded together with the cathode of the second capacitor E151, i.e., SGND.
As shown in fig. 3, in an embodiment of the present invention, the PFC operation control module includes a third control unit 103 and a fourth control unit 104, and the third control unit 103 and the fourth control unit 104 are connected through a second optical coupler PC 101.
The PFC operation control module includes: a fifth resistor R156, a sixth resistor R157, and a third transistor Q154. The fifth resistor R156 is connected in series with the sixth resistor R157, one end of the fifth resistor R156 is connected to the input end of the first control signal, that is, PS _ ON in the figure, and the other end of the fifth resistor R156 is connected to one end of the sixth resistor R157. The sixth resistor R157 is connected in parallel with the third triode Q154, one end of the sixth resistor R157 is further connected to the base of the third triode Q154, the collector of the third triode Q154 is connected to a power supply through the photodiode of the second optocoupler PC101, and the power supply is a power supply with a relatively low voltage, for example, the power supply may be a 12V power supply. The emitter of the third transistor Q154 and the other end of the sixth resistor R157 are commonly grounded.
In some application scenarios, for example, when a television power supply is turned ON or a television power supply is subjected to factory test, the PFC operation control module receives a first control signal PS _ ON, where the PS _ ON is a backlight power supply control signal sent by a television motherboard when the television power supply is turned ON, and the PS _ ON is a power supply signal, which may be a high-level power supply signal, when the television power supply is subjected to factory test. The PS _ ON signal input to the PFC operation control module is divided by the fifth resistor R156 and the sixth resistor 157, and a voltage between the base and the emitter of the third transistor Q154, that is, a voltage divided by the sixth resistor R157. The collector of the third transistor Q154 is connected to a lower voltage power supply, for example 12V, via the optocoupler PC 101. In the case where a 12V power is inputted to the collector of the third transistor Q154 and PS _ ON is inputted to the base of the third transistor Q154, the third transistor Q154 is turned ON and the second photo-coupler PC101 is also turned ON.
In an alternative embodiment, a fourth capacitor C153 is added to the third control unit 103 of the PFC operation control module, one end of the fourth capacitor C153 is connected to the base of the third transistor Q154 and one end of the sixth resistor R157, and the other end of the fourth capacitor C153 is connected to the ground together with the emitter of the third transistor Q154, so as to achieve the effect of filtering the BL _ ON signal input to the third transistor Q154. In addition, a seventh resistor R158 is added between the anode of the second optocoupler PC101 and the power supply, so as to limit the current flowing through the second optocoupler PC101, that is, one end of the seventh resistor R158 is connected to the power supply, and the other end is connected to the anode of the second optocoupler PC101 in the third control unit.
The fourth control unit 104 comprises a voltage stabilizing chip ZD101 and a fourth triode Q153; the collector of the second optocoupler PC101 and the collector of the fourth triode Q153 are connected to an external power VCC1, and the external power VCC1 may be a 380V power supply or a 220V power supply. An emitter of the second optocoupler PC101 is connected to a base of the fourth triode Q153, and the base of the fourth triode Q153 and the emitter of the second optocoupler PC101 are grounded together through a voltage stabilizing chip ZD101, where the ground is SGND. The emitter of the fourth transistor Q153 is connected to the PFC module.
In some application scenarios, for example, when the power supply of the television is turned on or the power supply of the television is subjected to factory test, since the collector of the fourth transistor Q153 is connected to the external power VCC1, and the external power VCC1 is also connected to the base of the fourth transistor Q153 via the second optocoupler PC101, and the second optocoupler PC101 is in a conducting state, the current of the external power VCC1 can be input to the base of the fourth transistor Q153, and the fourth transistor Q153 is conducted. The fourth control unit 104 of the PFC operation control module generates a power supply signal PFC _ VCC at an emitter of the fourth transistor Q153 and outputs the PFC _ VC to the PFC module.
In an alternative embodiment, an eighth resistor R159 and a fifth capacitor E152 are added to the fourth control unit 104 of the PFC operation control module. The eighth resistor R159 and the collector of the fourth triode Q153 are connected to an external power supply VCC1, and the other end of the eighth resistor R159 is connected to the collector of the second optocoupler PC101, so that the current flowing into the fourth triode Q153 can be limited. The anode of the fifth capacitor E152 is connected to the emitter of the fourth triode Q153, and the cathode of the fourth capacitor E152 is grounded together with the voltage stabilization chip ZD101, i.e. SGND, so as to implement the function of filtering the output PFC _ VCC.
In this embodiment, when the third control unit 103 of the PFC operation control module receives the PS _ ON signal, the fourth control unit 104 of the PFC operation control module generates a power supply signal PFC _ VCC to supply power to the PFC module, and the PFC module receives the power supply signal to start operation and supply power to the backlight power output unit of the backlight module, so that the voltage applied to the backlight power output unit gradually increases from zero to a specified voltage value, for example, 390V. The first control unit 101 of the standby switch control module receives a BL _ ON signal circuit to be turned ON and enables the first optocoupler PC102 to be turned ON, the second control unit 102 charges a second capacitor E151 of the second control unit 102 by an external power supply under the combined action of the first control unit and the external power supply, after the second capacitor E151 is fully charged, the second triode Q151 is turned ON and outputs a chip control signal LLC _ VCC to a chip control unit of the backlight module at an emitter of the second triode Q151, the chip control unit starts to work under the action of the received chip control signal LLC _ VCC, the backlight power output unit which controls the power supply voltage to reach a specified voltage value works, so that when a television power supply is started or a television power supply leaves a factory, the power supply voltage applied to the backlight power output unit reaches the specified voltage value, and the chip control unit controls the working time sequence of the backlight power output unit to avoid the protection condition. The external power supply charges the second capacitor E151 in the second control unit 102, and plays a role of delaying the output chip control signal LLC _ VCC.
The utility model discloses an in the embodiment, power multi-topology sequential control circuit still includes the start signal generation module, the start signal generation module includes auxiliary power supply and TV set mainboard, auxiliary power supply with the TV set mainboard is connected, auxiliary power supply gives the power supply of TV set mainboard, the TV set mainboard generates first control signal PS _ ON promptly and second control signal BL _ ON promptly.
In this embodiment, the first control signal and the second control signal generated by the tv motherboard are in sequence, that is, the tv motherboard outputs the first control signal to the PFC operation control module first, and outputs the second control signal to the first control unit 101 of the standby switch control module after a certain time difference, so as to satisfy that when the tv power is turned on, the power supply voltage applied to the backlight power output unit reaches a specified voltage value, and the chip control unit controls the timing sequence of the operation of the backlight power output unit.
As shown in fig. 4, in an embodiment of the present invention, the auxiliary power supply includes an auxiliary power supply chip 301, a square wave voltage generating unit 302 and an output unit 303; the auxiliary power supply chip 301 is connected to the square wave voltage generating unit 302, and the auxiliary power supply chip 301 is configured to control the square wave voltage generating unit 302 to generate a square wave voltage; the square wave voltage generating unit 302 is connected to the primary winding of the transformer TB101, and is configured to input the generated square wave voltage to the primary winding of the transformer TB101, and generate induced electromotive force at the secondary winding of the transformer TB 101; the output unit 303 is connected to the secondary winding of the transformer TB101, and is configured to output the induced electromotive force.
As shown in fig. 4, in an embodiment of the present invention, the output unit includes a diode DB101 and a capacitor EB102; wherein, the first and the second end of the pipe are connected with each other,
the anode of the diode DB101 is connected with one end of the secondary winding of the transformer, the cathode of the diode DB101 is connected with the anode of the capacitor EB102, and the cathode of the capacitor EB102 and the other end of the secondary winding are grounded together.
Specifically, the induced current generated in the secondary winding is input to the capacitor EB102 through the diode DB101, charging the capacitor EB 102. The capacitor EB102 is used to discharge an external circuit such as a backlight of a television set. In addition, two diodes can be connected in parallel, namely the anodes of the two diodes are connected together, and the cathodes of the two diodes are connected together, so that the diodes can bear larger current, and when one of the diodes is damaged, the other diode can enable the circuit to continue to work. The capacitance reactance can be improved by connecting the two capacitors in parallel so as to store more electric energy.
The utility model discloses a power multi-topology sequential control circuit that embodiment provided, when the test was produced to the TV set power, first control signal and second control signal connected had first control signal and second control signal input always at external power supply to first control signal and second control signal's input does not have precedence. The PFC work control module receives the first control signal and generates a power supply signal to supply power to the PFC module, the PFC module receives the power supply signal and starts work to supply power to the backlight power supply output unit, and the voltage applied to the backlight power supply output unit is gradually increased from zero to a specified voltage value. Meanwhile, the first control unit of the standby switch control module receives the second control signal, generates a third control signal and outputs the third control signal to the second control unit, after the external power supply fully charges the energy storage module in the second control module, the second control unit outputs a chip control signal to the chip control unit of the backlight module under the combined action of the third control signal and the accessed external power supply, and then the chip control unit controls the backlight power supply output unit of which the power supply voltage reaches the specified voltage value to work. The external power supply charges the energy storage module in the second control unit firstly, the second control unit outputs a chip control signal to the chip control unit after the external power supply is fully charged, and the energy storage module plays a role in delaying the second control unit to output the chip control signal. The utility model provides a pair of power multi-topology sequential control circuit can avoid when the TV set power production test, and the supply voltage who appears applying power output unit in a poor light does not reach appointed magnitude of voltage, and the circumstances of protection appears in power output unit in a poor light.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. The utility model provides a power supply multi-topology sequential control circuit, its characterized in that includes standby switch control module, PFC work control module, PFC module and backlight module, standby switch control module includes first control unit and second control unit, backlight module includes chip control unit and backlight output unit, wherein:
the PFC work control module is connected with the PFC module, receives a first control signal, generates a power supply signal and outputs the power supply signal to the PFC module;
the PFC module is connected with an external power supply and also connected with a backlight power supply output unit of the backlight module, and the PFC module receives the power supply signal and supplies power to the backlight power supply output unit;
the first control unit of the standby switch control module receives the second control signal, generates a third control signal and outputs the third control signal to the second control unit; one end of the second control unit is connected with an external power supply, the other end of the second control unit is connected with the chip control unit of the backlight module, and after the external power supply is fully charged to the energy storage module in the second control unit, the second control unit outputs a chip control signal to the chip control unit of the backlight module under the combined action of the third control signal and the external power supply; in the process of charging the energy storage module, the power supply voltage of the backlight power supply output unit is increased to a specified voltage value;
the chip control unit is also connected with the backlight power output unit, and the chip control unit receives the chip control signal and controls the working state of the backlight power output unit when the power supply voltage is increased to a specified voltage value.
2. The power supply multi-topology timing control circuit according to claim 1, wherein the first control unit and the second control unit are connected by a first optical coupler, wherein,
the first control unit includes: the first resistor, the second resistor and the first triode; the first resistor is connected with the second resistor in series, one end of the first resistor is connected with the input end of the second control signal, and the other end of the first resistor is connected with one end of the second resistor; the first triode is connected with the second resistor in parallel, the base of the first triode is connected with one end of the second resistor, the emitting electrode of the first triode is grounded with the other end of the second resistor together, and the collecting electrode of the first triode is connected with a power supply in the first control unit through the first optocoupler.
3. The power supply multi-topology timing control circuit according to claim 2, wherein the first control unit further comprises a third resistor and a first capacitor; wherein the content of the first and second substances,
one end of the third resistor is connected with a power supply, and the other end of the third resistor is connected with an anode of the first optocoupler in the first control unit;
the first capacitor is connected with the first triode and the second resistor in parallel, and one end of the first capacitor is connected with the base electrode of the first triode and also connected with one end of the second resistor; the other end of the first capacitor is connected with the emitting electrode of the first triode, and is also connected with the other end of the second resistor, and the other ends of the first capacitor and the second resistor are grounded together.
4. The power supply multi-topology timing control circuit according to claim 2, wherein the second control unit comprises a second capacitor and a second triode; the collector of the first optocoupler is connected with an external power supply in the second control unit, the collector of the first optocoupler is grounded through the second capacitor, the emitter of the first optocoupler is connected with the base of the second triode in the second control unit, and the emitter of the second triode is connected with the chip control unit.
5. The power supply multi-topology timing control circuit according to claim 4, wherein said second control unit further comprises: a fourth resistor and a third capacitor; wherein the content of the first and second substances,
one end of the fourth resistor is connected with an external power supply, and the other end of the fourth resistor is connected with a collector of the first optocoupler and is connected with the anode of the second capacitor;
one end of the third capacitor is connected with the emitting electrode of the second triode, and the other end of the third capacitor is connected with the cathode of the second capacitor.
6. The power supply multi-topology timing control circuit according to claim 1, wherein the PFC operation control module comprises a third control unit and a fourth control unit, and the third control unit and the fourth control unit are connected through a second optical coupler.
7. The power supply multi-topology timing control circuit according to claim 6, wherein the third control unit comprises a fifth resistor, a sixth resistor and a third transistor;
the fifth resistor is connected in series with the sixth resistor, one end of the fifth resistor is connected with the input end of the first control signal, and the other end of the fifth resistor is connected with one end of the sixth resistor; the sixth resistor is connected with the third triode in parallel, one end of the sixth resistor is further connected with a base electrode of the third triode, a collector electrode of the third triode is connected with a power supply in the third control unit through the second optocoupler, and an emitting electrode of the third triode and the other end of the sixth resistor are grounded together.
8. The power supply multi-topology timing control circuit according to claim 7, wherein said third control unit further comprises a seventh resistor and a fourth capacitor; wherein, the first and the second end of the pipe are connected with each other,
one end of the seventh resistor is connected with a power supply, and the other end of the seventh resistor is connected with an anode of the second optocoupler in the third control unit;
the fourth capacitor is connected with the third triode and the sixth resistor in parallel, and one end of the fourth capacitor is connected with the base electrode of the third triode and also connected with one end of the sixth resistor; the other end of the fourth capacitor is connected with the emitter of the third triode, and is also connected with the other end of the sixth resistor, and the other ends of the fourth capacitor and the sixth resistor are grounded together.
9. The power supply multi-topology timing control circuit according to claim 6, wherein the fourth control unit comprises a voltage stabilization chip and a fourth triode; wherein the content of the first and second substances,
a collector of the second optocoupler and a collector of the fourth triode are connected with an external power supply together, an emitter of the second optocoupler is connected with a base of the fourth triode, and the base of the fourth triode and the emitter of the second optocoupler are grounded together through a voltage stabilizing chip; and the emitter of the fourth triode is connected with the PFC module.
10. The power supply multi-topology timing control circuit according to claim 9, wherein the fourth control unit further comprises an eighth resistor and a fifth capacitor; wherein the content of the first and second substances,
one end of the eighth resistor is connected with the collector of the fourth triode and is commonly connected with an external power supply, and the other end of the eighth resistor is connected with the collector of the second optocoupler;
and the anode of the fifth capacitor is connected with the emitter of the fourth triode, and the cathode of the fifth capacitor is connected with the grounding end of the voltage stabilizing chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221495885.3U CN218243335U (en) | 2022-06-14 | 2022-06-14 | Power supply multi-topology sequential control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221495885.3U CN218243335U (en) | 2022-06-14 | 2022-06-14 | Power supply multi-topology sequential control circuit |
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| CN202221495885.3U Active CN218243335U (en) | 2022-06-14 | 2022-06-14 | Power supply multi-topology sequential control circuit |
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