CN111405275A - Direct current power supply circuit and television board card test system - Google Patents
Direct current power supply circuit and television board card test system Download PDFInfo
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- CN111405275A CN111405275A CN202010265854.8A CN202010265854A CN111405275A CN 111405275 A CN111405275 A CN 111405275A CN 202010265854 A CN202010265854 A CN 202010265854A CN 111405275 A CN111405275 A CN 111405275A
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- 238000012360 testing method Methods 0.000 title claims abstract description 37
- 239000003990 capacitor Substances 0.000 claims description 52
- 238000005070 sampling Methods 0.000 claims description 32
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 9
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- 238000005265 energy consumption Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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Abstract
The invention provides a direct current power supply circuit and a television board card test system, wherein the direct current power supply circuit comprises a direct current input end, a direct current output end, a switch circuit, a reference voltage generating circuit, an undervoltage protection circuit, an overvoltage protection circuit, a control circuit and a power supply circuit, the overvoltage protection circuit and the undervoltage protection circuit sample the voltage of the direct current input end and correspondingly output a feedback signal, the control circuit determines whether the voltage of the direct current input end is in a normal, overvoltage or undervoltage state according to the feedback signal, and controls the switch circuit to be turned off when the voltage is undervoltage or overvoltage so as to cut off the output, thereby realizing the voltage monitoring of the direct current power supply circuit, realizing undervoltage and overvoltage protection and improving the reliability of voltage protection.
Description
Technical Field
The invention belongs to the technical field of switching power supplies, and particularly relates to a direct-current power supply circuit and a television board card test system.
Background
The television board card is required to carry out corresponding electrical property test on the television board card through a testing device before leaving the factory, the testing device supplies power through a direct current power supply circuit, at present, the direct current power supply circuit used in the factory mainly realizes power voltage overvoltage protection through a fuse fusing mode, because the power supply of the direct current power supply in the factory is unstable, if the voltage input exceeds the specification of a fuse, the fuse of equipment is easily damaged, if the input voltage is too low, the equipment is easily unstable in working, and the input power supply voltage cannot be monitored often.
Disclosure of Invention
The invention aims to provide a direct-current power supply circuit, which aims to solve the problem that the traditional direct-current power supply circuit is unreliable in overvoltage and voltage protection.
A first aspect of an embodiment of the present invention provides a dc power supply circuit, which includes a dc input terminal, a dc output terminal, a switch circuit, a reference voltage generation circuit, an under-voltage protection circuit, an over-voltage protection circuit, a control circuit, and a power supply circuit;
the switch circuit is electrically connected with the direct current input end, the direct current output end and the control circuit respectively, the direct current input end and the control circuit are also electrically connected with the under-voltage protection circuit, the reference voltage generation circuit and the overvoltage protection circuit respectively, and the power circuit is electrically connected with the direct current output end and the control circuit respectively;
the power supply circuit is used for converting the direct-current power supply output by the direct-current output end into a first direct-current power supply and outputting the first direct-current power supply to the control circuit when the switch circuit is switched on, and outputting a second direct-current power supply to the control circuit when the switch circuit is switched off;
the reference voltage generating circuit is used for outputting a reference voltage signal to the undervoltage protection circuit and the overvoltage protection circuit according to a direct-current power supply accessed by the direct-current input end;
the undervoltage protection circuit is used for sampling the direct-current power supply to obtain an undervoltage sampling signal, outputting a first feedback signal to the control circuit when the voltage of the undervoltage sampling signal is greater than or equal to the voltage of the reference voltage signal, and outputting a second feedback signal to the control circuit when the voltage of the undervoltage sampling signal is less than the voltage of the reference voltage signal;
the overvoltage protection circuit is used for sampling the voltage of the direct-current power supply to obtain an overvoltage sampling signal, outputting a third feedback signal to the control circuit when the voltage of the overvoltage sampling signal is greater than the voltage of the reference voltage signal, and outputting a fourth feedback signal to the control circuit when the voltage of the overvoltage sampling signal is less than or equal to the voltage of the reference voltage signal;
the control circuit is configured to control the switch circuit to turn off when receiving the second feedback signal or the third feedback signal, and control the switch circuit to turn on when receiving the first feedback signal or the fourth feedback signal, so as to output the dc power through the dc output terminal.
In one embodiment, the power circuit includes a battery, a power conversion module, and a switch switching module;
the power input end of the power conversion module is connected with the direct current output end, the power output end of the power conversion module, the first power input end of the switch switching module and the controlled end of the switch switching module are interconnected, the power end of the battery is connected with the second power input end of the switch switching module, and the power output end of the switch switching module is connected with the power end of the control circuit;
the power supply conversion module is used for converting the direct-current power supply into the first direct-current power supply to a first power supply input end and a controlled end of the switch switching module when the switch circuit is switched on;
the battery is used for outputting a second direct-current power supply to a second power supply input end of the switch switching module;
the switch switching module is used for switching to a first switch state when the controlled end receives the first direct-current power supply and outputting the first direct-current power supply to the control circuit; and
and when the controlled end does not receive the first direct current power supply, the controlled end is switched to a second switch state, and the second direct current power supply is output to the control circuit.
In one embodiment, the power conversion module includes a switching power chip.
In one embodiment, the switch switching module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a first electronic switch tube, a second electronic switch tube, a third electronic switch tube, a first diode, a second diode and a first inductor;
the first end of the first resistor is a controlled end of the switch switching module, the second end of the first resistor is connected with the controlled end of the first electronic switch tube, the output end of the first electronic switch tube is grounded, the input end of the first electronic switch tube, the first end of the second resistor and the controlled end of the second electronic switch tube are interconnected, the second end of the second resistor, the first end of the first capacitor, the first end of the third resistor and the input end of the third electronic switch tube are connected in common to form a second power input end of the switch switching module, the second end of the third resistor, the input end of the second electronic switch tube and the first end of the fourth resistor are interconnected, the output end of the second electronic switch tube is grounded, the second end of the fourth resistor is connected with the controlled end of the third electronic switch tube, and the output end of the third electronic switch tube is connected with the anode of the first diode, the cathode of the first diode, the cathode of the second diode and the first end of the first inductor are interconnected, the anode of the second diode is a first power input end of the switch switching module, the second end of the first inductor and the first end of the second capacitor are connected to form an output end of the switch switching module, and the second end of the first capacitor and the second end of the second capacitor are grounded.
In one embodiment, the switching circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor, a fourth electronic switching tube and a fifth electronic switching tube;
the first end of the sixth resistor is the controlled end of the switch circuit, the second end of the sixth resistor is connected with the controlled end of the fourth electronic switch tube, the output end of the fourth electronic switch tube is grounded, the input end of the fourth electronic switch tube, the first end of the sixth resistor and the first end of the seventh resistor are interconnected, the second end of the sixth resistor, the first end of the third capacitor and the input end of the fifth electronic switch tube are interconnected to form the input end of the switch circuit, the second end of the seventh resistor, the second end of the third capacitor and the controlled end of the fifth electronic switch tube are interconnected, and the output end of the sixth electronic switch tube is the output end of the switch circuit.
In one embodiment, the reference voltage generating circuit comprises an eighth resistor, a ninth resistor, a tenth resistor, a fourth capacitor and a voltage regulator;
the first end of the eighth resistor is the input end of the reference voltage generating circuit, the second end of the eighth resistor, the cathode of the voltage regulator, the reference end of the voltage regulator, the first end of the fourth capacitor, the first end of the ninth resistor and the first end of the tenth resistor are interconnected, the anode of the voltage regulator, the second end of the fourth capacitor and the second end of the ninth resistor are all grounded, and the second end of the tenth resistor is the output end of the reference voltage generating circuit.
In one embodiment, the undervoltage protection circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fifth capacitor and a first comparator;
the first end of the eleventh resistor is a first input end of the undervoltage protection circuit, the second end of the eleventh resistor, the first end of the twelfth resistor, the first end of the fifth capacitor and the first end of the thirteenth resistor are interconnected, the second end of the twelfth resistor and the second end of the fifth capacitor are both grounded, the second end of the thirteenth resistor is connected with a positive input end of the first comparator, an inverted input end of the first comparator is a second input end of the undervoltage protection circuit, and an output end of the first comparator is an output end of the undervoltage protection circuit.
In one embodiment, the overvoltage protection circuit comprises a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a sixth capacitor and a second comparator;
the first end of the fourteenth resistor is the first input end of the overvoltage protection circuit, the second end of the fourteenth resistor, the first end of the fifteenth resistor, the first end of the sixth capacitor and the first end of the sixteenth resistor are interconnected, the second end of the fifteenth resistor and the second end of the sixth capacitor are both grounded, the second end of the sixteenth resistor is connected with the inverting input end of the second comparator, the positive-phase input end of the second comparator is the second input end of the overvoltage protection circuit, and the output end of the second comparator is the output end of the overvoltage protection circuit.
In one embodiment, the control circuit includes a control chip.
A second aspect of the embodiments of the present invention provides a television board test system, where the television board test system includes a television board, a test device, and the above-mentioned dc power supply circuit, a power supply output end of the dc power supply circuit is connected to a power supply input end of the test device, and a signal end of the test device is connected to a signal end of the television board.
The invention adopts a direct current input end, a direct current output end, a switch circuit, a reference voltage generating circuit, an under-voltage protection circuit, an over-voltage protection circuit, a control circuit and a power circuit to form the direct current power circuit, so as to supply power for a test device of a television board card, the over-voltage protection circuit and the under-voltage protection circuit sample the voltage of the direct current input end and correspondingly output a feedback signal, the control circuit determines whether the voltage of the direct current input end is in a normal, over-voltage or under-voltage state according to the feedback signal, and controls the switch circuit to be switched off when the voltage is under-voltage and over-voltage so as to cut off the output, thereby realizing the voltage monitoring of the direct current power circuit, realizing the under-voltage and over-voltage protection, simultaneously, the power circuit supplies power for the control module by converting the direct current power supply of the direct current output end into a first direct current power supply when the voltage is not over-voltage and under-voltage, thereby achieving the purposes of reducing energy consumption and monitoring and controlling in real time.
Drawings
Fig. 1 is a schematic block diagram of a dc power circuit according to a first embodiment of the present invention;
FIG. 2 is a schematic block diagram of a DC power circuit according to a second embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a switch switching module in the DC power circuit according to the present invention;
FIG. 4 is a schematic circuit diagram of a switch circuit in the DC power supply circuit according to the present invention;
FIG. 5 is a schematic circuit diagram of a reference voltage generating circuit in the DC power supply circuit according to the present invention;
FIG. 6 is a schematic diagram of a circuit structure of an under-voltage protection circuit in the DC power supply circuit according to the present invention;
FIG. 7 is a schematic circuit diagram of an overvoltage protection circuit in the DC power supply circuit according to the present invention;
fig. 8 is a schematic diagram of a module structure of an embodiment of the television board test system of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
A first aspect of the embodiments of the present invention provides a dc power circuit 100.
As shown IN fig. 1, fig. 1 is a schematic block structure diagram of a DC power supply circuit 100 according to a first embodiment of the present invention, IN this embodiment, the DC power supply circuit 100 includes a DC input terminal DC _ IN, a DC output terminal DC _ OUT, a switch circuit 10, a reference voltage generating circuit 20, an under-voltage protection circuit 30, an over-voltage protection circuit 40, a control circuit 50, and a power supply circuit 60;
the switch circuit 10 is electrically connected with the direct current input end DC _ IN, the direct current output end DC _ OUT and the control circuit 50 respectively, the direct current input end DC _ IN and the control circuit 50 are also electrically connected with the undervoltage protection circuit 30, the reference voltage generation circuit 20 and the overvoltage protection circuit 40 respectively, and the power circuit 60 is electrically connected with the direct current output end DC _ OUT and the control circuit 50 respectively;
the power supply circuit 60 is configured to convert the DC power output from the DC output terminal DC _ OUT into a first DC power V1 and output the first DC power V1 to the control circuit 50 when the switch circuit 10 is turned on, and output a second DC power V2 to the control circuit 50 when the switch circuit 10 is turned off;
the reference voltage generating circuit 20 is configured to output a reference voltage signal to the undervoltage protection circuit 30 and the overvoltage protection circuit 40 according to a DC power supply accessed by the DC input terminal DC _ IN;
the undervoltage protection circuit 30 is configured to sample the dc power supply to obtain an undervoltage sampling signal, output a first feedback signal to the control circuit 50 when a voltage of the undervoltage sampling signal is greater than or equal to a voltage of the reference voltage signal, and output a second feedback signal to the control circuit 50 when the voltage of the undervoltage sampling signal is less than the voltage of the reference voltage signal;
the overvoltage protection circuit 40 is configured to sample a voltage of the dc power supply to obtain an overvoltage sampling signal, output a third feedback signal to the control circuit 50 when the voltage of the overvoltage sampling signal is greater than the voltage of the reference voltage signal, and output a fourth feedback signal to the control circuit 50 when the voltage of the overvoltage sampling signal is less than or equal to the voltage of the reference voltage signal;
and the control circuit 50 is configured to control the switch circuit 10 to be turned off when receiving the second feedback signal or the third feedback signal, and control the switch circuit 10 to be turned on when receiving the first feedback signal or the fourth feedback signal, so as to output the dc power through the dc output terminal.
In this embodiment, the dc power circuit 100 is configured to output a dc power to the testing device 200 to supply power to the testing device 200, the testing device 200 performs various performance tests on the television board 300, such as sound, image, key, and remote controller, the testing device 200 may include an audio acquisition module, a voltage acquisition module, and an analog key module, and the switching circuit 10 is used as an on-off switch of the dc power circuit 100, and is turned on or off according to a switch control signal to perform output control on the dc power, wherein the switching circuit 10 may adopt various switching devices or combined circuits with controlled on-off capability, such as a triode, an MOS transistor, and a relay.
When the voltage of the DC input terminal DC _ IN is within the safe voltage range, assuming that the safe voltage range is [ Va, Vb ], that is, the voltage of the under-voltage sampling signal is greater than or equal to the reference voltage signal, or the voltage of the over-voltage sampling signal is less than or equal to the reference voltage signal, the under-voltage protection circuit 30 outputs a first feedback signal, the over-voltage protection circuit 40 outputs a fourth feedback signal, the control circuit 50 controls the switch circuit 10 to maintain a conducting state, the DC power is output to the testing device 200 through the switch circuit 10, at this time, the power module converts the DC power, and outputs a working power to the control circuit 50 to supply power to the control circuit 50.
When the voltage of the undervoltage sampling signal is smaller than the reference voltage signal, that is, when the voltage of the DC input terminal DC _ IN is smaller than Va, it indicates that the current-period input voltage is IN an undervoltage state, at this time, the undervoltage protection circuit 30 outputs a second feedback signal, the control circuit 50 controls the switching circuit 10 to turn off according to the second feedback signal, the DC power supply stops outputting to the testing device 200, and meanwhile, the power module switches and outputs a second DC power supply V2 to supply power to the control circuit 50.
When the voltage of the overvoltage sampling signal is greater than the reference voltage signal, that is, when the voltage of the DC input terminal DC _ IN is greater than Vb, it indicates that the current input voltage is IN an overvoltage state, at this time, the overvoltage protection circuit 40 outputs a third feedback signal, the control circuit 50 controls the switch circuit 10 to turn off according to the third feedback signal, the DC power supply stops outputting to the testing device 200, and meanwhile, the power supply module switches to output a second DC power supply V2 to supply power to the control circuit 50.
The reference voltage signal of the undervoltage protection circuit 30 and the overvoltage protection circuit 40 and the voltage signal of the DC input terminal DC _ IN output corresponding feedback signals, which may respectively adopt a comparator, a comparison chip or other peripheral structures, and the specific structure is not limited.
The reference voltage generating circuit 20 is configured to output a reference voltage signal with a constant magnitude, and may adopt a voltage regulator tube, a voltage regulator source U1, and other circuit structures, and the control circuit 50 may adopt a controller, a control chip, and the like, and in one embodiment, the control circuit 50 includes the control chip.
The power circuit 60 outputs a first dc power V1 and a second dc power V2 according to the presence or absence of the dc power, and the power circuit 60 may employ a switch switching module 62 and at least one current source, as shown in fig. 2, in one embodiment, the power circuit 60 includes a battery 61, a power conversion module 63, and a switch switching module 62;
the power input end of the power conversion module 63 is connected with the direct current output end DC _ OUT, the power output end of the power conversion module 63, the first power input end of the switch switching module 62 and the controlled end of the switch switching module 62 are interconnected, the power end of the battery 61 is connected with the second power input end of the switch switching module 62, and the power output end of the switch switching module 62 is connected with the power end of the control circuit 50;
the power conversion module 63 is configured to convert the dc power into a first dc power V1 to a first power input end and a controlled end of the switch switching module 62 when the switch circuit 10 is turned on;
the battery 61 is used for outputting a second direct current power supply V2 to a second power supply input end of the switch switching module 62;
the switch switching module 62 is configured to switch to a first switch state when the controlled terminal receives the first dc power V1, and output the first dc power V1 to the control circuit 50; and
when the controlled terminal does not receive the first dc power V1, the controlled terminal switches to the second switch state and outputs the second dc power V2 to the control circuit 50.
In this embodiment, the power terminals of the switch switching module 62 are respectively connected to the power conversion module 63 and the battery 61, and meanwhile, the controlled terminal is connected to the output terminal of the power conversion module 63, when the voltage of the dc power supply is normal, the switch circuit 10 is normally turned on, at this time, the switch switching module 62 is connected to the first power input terminal and the power output terminal, the power conversion module 63 outputs the first dc power supply V1 to the control circuit 50, when the voltage of the dc power supply is under-voltage or over-voltage, the switch circuit 10 is turned off, at this time, the switch switching module 62 is connected to the second power input terminal and the power output terminal, and the power module outputs the second dc power supply V2 to the control circuit.
The switch switching module 62 may adopt a multiplexer switch or a multi-switch combination circuit, the specific structure is not limited, the power conversion module 63 may adopt a buck-boost circuit, a switch chip, and the like, and in one embodiment, the power conversion module 63 includes a switch power chip.
The invention adopts a direct current input end DC _ IN, a direct current output end DC _ OUT, a switch circuit 10, a reference voltage generating circuit 20, an undervoltage protection circuit 30, an overvoltage protection circuit 40, a control circuit 50 and a power supply circuit 60 to form a direct current power supply circuit 100 to supply power for a testing device 200 of a television board 300, the overvoltage protection circuit 40 and the undervoltage protection circuit 30 sample the voltage of the direct current input end DC _ IN and correspondingly output a feedback signal, the control circuit 50 determines whether the voltage of the direct current input end DC _ IN is IN a normal, overvoltage or undervoltage state according to the feedback signal and controls the switch circuit 10 to be switched off to cut off the output when the undervoltage and the overvoltage occur, thereby realizing the voltage monitoring of the direct current power supply circuit 100 and realizing the undervoltage and overvoltage protection, and simultaneously, when the overvoltage and the undervoltage do not occur, the power supply circuit 60 supplies power for the control module by converting the direct current power supply of the direct current output end DC _ OUT into a first direct current source V1, and directly outputs a second direct current power supply V2 module to supply power for the control circuit 50 when overvoltage and undervoltage occur, thereby achieving the purposes of reducing energy consumption and monitoring and controlling in real time.
As shown in fig. 3, in an embodiment, the switch switching module 62 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, a first electronic switch Q1, a second electronic switch Q2, a third electronic switch Q3, a first diode D1, a second diode D2, and a first inductor L1;
a first terminal of the first resistor R1 is a controlled terminal of the switch switching module 62, a second terminal of the first resistor R1 is connected to a controlled terminal of the first electronic switch Q1, an output terminal of the first electronic switch Q1 is grounded, an input terminal of the first electronic switch Q1, a first terminal of the second resistor R2 and a controlled terminal of the second electronic switch Q2 are interconnected, a second terminal of the second resistor R2, a first terminal of the first capacitor C1, a first terminal of the third resistor R3 and an input terminal of the third electronic switch Q3 are interconnected to form a second power input terminal of the switch switching module 62, a first terminal of the third resistor R3, an input terminal of the second electronic switch Q56 and a first terminal of the fourth resistor R4 are interconnected, an output terminal of the second electronic switch Q2 is grounded, a second terminal of the fourth resistor R4 is connected to a controlled terminal of the third electronic switch Q3, a first terminal of the third electronic switch Q3, an output terminal of the first diode R1 is connected to a cathode 1, a cathode terminal of the first diode 1, a cathode terminal of the first diode 1, a cathode 1D 1, a cathode terminal of the first diode 1 and a cathode 1 are connected to the first diode 1, a cathode 1 of the first diode 1, a first diode 1.
In this embodiment, when the power input voltage is within the standard range, the first dc power source V1 is at a high level, the first electronic switch tube Q1 is turned on, the second electronic switch tube Q2 is turned off, the controlled end of the third electronic switch tube Q3 is at a high level, the third electronic switch tube Q3 is turned off, the first dc power source V1 is output to the control circuit 50 through the second diode D2 and the first inductor L1, the first inductor L1 and the second capacitor C2 form a L C filter circuit, when the power input voltage is abnormal and exceeds the preset voltage range, the voltage of the first dc power source V1 is at a low level, the first electronic switch tube Q1 is turned off, the second electronic switch tube Q2 is turned on, the controlled end of the third electronic switch tube Q3 is at a low level and is turned on, the second dc power source V2 is output to the control circuit 50 through the third electronic switch tube Q3, the first diode D1 and the first inductor L1, thereby realizing the monitoring of the abnormal input voltage at the stable working state of the control circuit 50.
As shown in fig. 4, in one embodiment, the switch circuit 10 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third capacitor C3, a fourth electronic switch Q4, and a fifth electronic switch Q5;
the first end of the fifth resistor R5 is a controlled end of the switch circuit 10, the second end of the fifth resistor R5 is connected to the controlled end of the fourth electronic switch Q4, the output end of the fourth electronic switch Q4 is grounded, the input end of the fourth electronic switch Q4, the first end of the sixth resistor R6 and the first end of the seventh resistor R7 are interconnected, the second end of the sixth resistor R6, the first end of the third capacitor C3 and the input end of the fifth electronic switch Q5 are interconnected to form the input end of the switch circuit 10, the second end of the seventh resistor R7, the second end of the third capacitor C3 and the controlled end of the fifth electronic switch Q5 are interconnected, and the output end of the fifth electronic switch Q5 is the output end of the switch circuit 10.
IN this embodiment, the fifth resistor R5 receives the control signal output by the control circuit 50, when the voltage of the DC power supply is normal, the control circuit 50 outputs a high level to the second resistor R2, the fourth electronic switch Q4 is turned on, the controlled terminal of the fifth electronic switch Q5 is a low level, the fifth electronic switch Q5 is turned on, the DC power supply is output to the DC output terminal DC _ OUT through the DC input terminal DC _ IN, when the voltage of the DC power supply exceeds the safe voltage range, the control circuit 50 outputs a low level, the fourth electronic switch Q4 is turned off, the controlled terminal of the fifth electronic switch Q5 is a high level, and the fifth electronic switch Q5 is turned off.
In this embodiment, each electronic switch tube may be a triode or a MOS transistor, in one embodiment, the first electronic switch tube Q1, the second electronic switch tube Q2, and the fourth electronic switch tube Q4 are NPN triodes, and the third electronic switch tube Q3 and the fifth electronic switch tube Q5 are PMOS transistors.
As shown in fig. 5, in one embodiment, the reference voltage generating circuit 20 includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a fourth capacitor C4, and a regulator U1;
the first end of the eighth resistor R8 is an input end of the reference voltage generating circuit 20, the second end of the eighth resistor R8, the cathode of the regulator U1, the reference end of the regulator U1, the first end of the fourth capacitor C4, the first end of the ninth resistor R9, and the first end of the tenth resistor R10 are interconnected, the anode of the regulator U1, the second end of the fourth capacitor C4, and the second end of the ninth resistor R9 are all grounded, and the second end of the tenth resistor R10 is an output end of the reference voltage generating circuit 20.
In this embodiment, the regulator U1 is used to output a reference voltage signal, and the specific size is designed according to the requirement, for example, 2.5V, 1.25V, and the like.
As shown in fig. 6, in one embodiment, the under-voltage protection circuit 30 includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fifth capacitor C5, and a first comparator U2;
a first end of the eleventh resistor R11 is a first input end of the under-voltage protection circuit 30, a second end of the eleventh resistor R11, a first end of the twelfth resistor R12, a first end of the fifth capacitor C5, and a first end of the thirteenth resistor R13 are interconnected, a second end of the twelfth resistor R12 and a second end of the fifth capacitor C5 are both grounded, a second end of the thirteenth resistor R13 is connected to a positive-phase input end of the first comparator U2, an inverting input end of the first comparator U2 is a second input end of the under-voltage protection circuit 30, and an output end of the first comparator U2 is an output end of the under-voltage protection circuit 30.
IN this embodiment, the eleventh resistor R11 and the twelfth resistor R12 form a resistor divider circuit, and sample the voltage of the DC power supply at the DC input terminal DC _ IN and output an under-voltage sampling signal to the first comparator U2, when the under-voltage sampling signal is greater than or equal to the reference voltage signal, the first comparator U2 outputs a first feedback signal, i.e., a high level, the control circuit 50 controls the switch circuit 10 to be turned on, when the under-voltage sampling signal is less than the reference voltage signal, the first comparator U2 outputs a second feedback signal, i.e., a low level, and the control circuit 50 controls the switch circuit 10 to be turned off.
As shown in fig. 7, in one embodiment, the overvoltage protection circuit 40 includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a sixth capacitor C6, and a second comparator U3;
a first end of the fourteenth resistor R14 is a first input end of the overvoltage protection circuit 40, a second end of the fourteenth resistor R14, a first end of the fifteenth resistor R15, a first end of the sixth capacitor C6, and a first end of the sixteenth resistor R16 are interconnected, a second end of the fifteenth resistor R15 and a second end of the sixth capacitor C6 are both grounded, a second end of the sixteenth resistor R16 is connected to an inverted input end of the second comparator U3, a non-inverting input end of the second comparator U3 is a second input end of the overvoltage protection circuit 40, and an output end of the second comparator U3 is an output end of the overvoltage protection circuit 40.
IN this embodiment, the fourteenth resistor R14 and the fifteenth resistor R15 form a resistor divider circuit, and sample the voltage of the DC power supply at the DC input terminal DC _ IN and output an overvoltage sampling signal to the second comparator U3, when the overvoltage sampling signal is greater than the reference voltage signal, the second comparator U3 outputs a third feedback signal, i.e., a low level, the control circuit 50 controls the switch circuit 10 to turn off, when the overvoltage sampling signal is less than or equal to the reference voltage signal, the second comparator U3 outputs a second feedback signal, i.e., a high level, and the control circuit 50 controls the switch circuit 10 to turn on.
As shown in fig. 8, a second aspect of the embodiment of the present invention provides a television board test system, where the television board test system includes a television board 300, a test device 200, and a dc power circuit 100, and the specific structure of the dc power circuit 100 refers to the above-mentioned embodiments, and the television board test system adopts all technical solutions of all the above-mentioned embodiments, so that the television board test system at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and details are not repeated here, where a power output end of the dc power circuit 100 is connected to a power input end of the test device 200, and a signal end of the test device 200 is connected to a signal end of the television board 300.
In this embodiment, the dc power circuit 100 is configured to output a dc power to the testing device 200 to supply power to the testing device 200, the testing device 200 performs various performance tests on the television board 300, such as sound, image, key, and remote controller, and the testing device 200 may include an audio acquisition module, a voltage acquisition module, and an analog key module, and the specific structure is not limited.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A direct current power supply circuit is characterized by comprising a direct current input end, a direct current output end, a switch circuit, a reference voltage generating circuit, an undervoltage protection circuit, an overvoltage protection circuit, a control circuit and a power supply circuit;
the switch circuit is electrically connected with the direct current input end, the direct current output end and the control circuit respectively, the direct current input end and the control circuit are also electrically connected with the under-voltage protection circuit, the reference voltage generation circuit and the overvoltage protection circuit respectively, and the power circuit is electrically connected with the direct current output end and the control circuit respectively;
the power supply circuit is used for converting the direct-current power supply output by the direct-current output end into a first direct-current power supply and outputting the first direct-current power supply to the control circuit when the switch circuit is switched on, and outputting a second direct-current power supply to the control circuit when the switch circuit is switched off;
the reference voltage generating circuit is used for outputting a reference voltage signal to the undervoltage protection circuit and the overvoltage protection circuit according to a direct-current power supply accessed by the direct-current input end;
the undervoltage protection circuit is used for sampling the direct-current power supply to obtain an undervoltage sampling signal, outputting a first feedback signal to the control circuit when the voltage of the undervoltage sampling signal is greater than or equal to the voltage of the reference voltage signal, and outputting a second feedback signal to the control circuit when the voltage of the undervoltage sampling signal is less than the voltage of the reference voltage signal;
the overvoltage protection circuit is used for sampling the voltage of the direct-current power supply to obtain an overvoltage sampling signal, outputting a third feedback signal to the control circuit when the voltage of the overvoltage sampling signal is greater than the voltage of the reference voltage signal, and outputting a fourth feedback signal to the control circuit when the voltage of the overvoltage sampling signal is less than or equal to the voltage of the reference voltage signal;
the control circuit is configured to control the switch circuit to turn off when receiving the second feedback signal or the third feedback signal, and control the switch circuit to turn on when receiving the first feedback signal or the fourth feedback signal so as to output the dc power through the dc output terminal.
2. The direct current power supply circuit of claim 1, wherein the power supply circuit comprises a battery, a power conversion module, and a switch switching module;
the power input end of the power conversion module is connected with the direct current output end, the power output end of the power conversion module, the first power input end of the switch switching module and the controlled end of the switch switching module are interconnected, the power end of the battery is connected with the second power input end of the switch switching module, and the power output end of the switch switching module is connected with the power end of the control circuit;
the power supply conversion module is used for converting the direct-current power supply into the first direct-current power supply to a first power supply input end and a controlled end of the switch switching module when the switch circuit is switched on;
the battery is used for outputting a second direct-current power supply to a second power supply input end of the switch switching module;
the switch switching module is used for switching to a first switch state when the controlled end receives the first direct-current power supply and outputting the first direct-current power supply to the control circuit; and
and when the controlled end does not receive the first direct current power supply, the controlled end is switched to a second switch state, and the second direct current power supply is output to the control circuit.
3. The dc power supply circuit of claim 2, wherein the power conversion module comprises a switching power supply chip.
4. The dc power supply circuit of claim 2, wherein the switching module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a first electronic switch, a second electronic switch, a third electronic switch, a first diode, a second diode, and a first inductor;
the first end of the first resistor is a controlled end of the switch switching module, the second end of the first resistor is connected with the controlled end of the first electronic switch tube, the output end of the first electronic switch tube is grounded, the input end of the first electronic switch tube, the first end of the second resistor and the controlled end of the second electronic switch tube are interconnected, the second end of the second resistor, the first end of the first capacitor, the first end of the third resistor and the input end of the third electronic switch tube are connected in common to form a second power input end of the switch switching module, the second end of the third resistor, the input end of the second electronic switch tube and the first end of the fourth resistor are interconnected, the output end of the second electronic switch tube is grounded, the second end of the fourth resistor is connected with the controlled end of the third electronic switch tube, and the output end of the third electronic switch tube is connected with the anode of the first diode, the cathode of the first diode, the cathode of the second diode and the first end of the first inductor are interconnected, the anode of the second diode is a first power input end of the switch switching module, the second end of the first inductor and the first end of the second capacitor are connected to form an output end of the switch switching module, and the second end of the first capacitor and the second end of the second capacitor are grounded.
5. The dc power supply circuit of claim 1, wherein the switching circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, a third capacitor, a fourth electronic switching tube, and a fifth electronic switching tube;
the first end of the sixth resistor is the controlled end of the switch circuit, the second end of the sixth resistor is connected with the controlled end of the fourth electronic switch tube, the output end of the fourth electronic switch tube is grounded, the input end of the fourth electronic switch tube, the first end of the sixth resistor and the first end of the seventh resistor are interconnected, the second end of the sixth resistor, the first end of the third capacitor and the input end of the fifth electronic switch tube are interconnected to form the input end of the switch circuit, the second end of the seventh resistor, the second end of the third capacitor and the controlled end of the fifth electronic switch tube are interconnected, and the output end of the sixth electronic switch tube is the output end of the switch circuit.
6. The dc power supply circuit according to claim 1, wherein the reference voltage generating circuit includes an eighth resistor, a ninth resistor, a tenth resistor, a fourth capacitor, and a regulator;
the first end of the eighth resistor is the input end of the reference voltage generating circuit, the second end of the eighth resistor, the cathode of the voltage regulator, the reference end of the voltage regulator, the first end of the fourth capacitor, the first end of the ninth resistor and the first end of the tenth resistor are interconnected, the anode of the voltage regulator, the second end of the fourth capacitor and the second end of the ninth resistor are all grounded, and the second end of the tenth resistor is the output end of the reference voltage generating circuit.
7. The dc power supply circuit of claim 1, wherein the undervoltage protection circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fifth capacitor, and a first comparator;
the first end of the eleventh resistor is a first input end of the undervoltage protection circuit, the second end of the eleventh resistor, the first end of the twelfth resistor, the first end of the fifth capacitor and the first end of the thirteenth resistor are interconnected, the second end of the twelfth resistor and the second end of the fifth capacitor are both grounded, the second end of the thirteenth resistor is connected with a positive input end of the first comparator, an inverted input end of the first comparator is a second input end of the undervoltage protection circuit, and an output end of the first comparator is an output end of the undervoltage protection circuit.
8. The direct current power supply circuit according to claim 1, wherein the overvoltage protection circuit includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a sixth capacitor, and a second comparator;
the first end of the fourteenth resistor is the first input end of the overvoltage protection circuit, the second end of the fourteenth resistor, the first end of the fifteenth resistor, the first end of the sixth capacitor and the first end of the sixteenth resistor are interconnected, the second end of the fifteenth resistor and the second end of the sixth capacitor are both grounded, the second end of the sixteenth resistor is connected with the inverting input end of the second comparator, the positive-phase input end of the second comparator is the second input end of the overvoltage protection circuit, and the output end of the second comparator is the output end of the overvoltage protection circuit.
9. The dc power supply circuit of claim 1, wherein the control circuit comprises a control chip.
10. A television board card test system is characterized by comprising a television board card, a test device and the direct-current power supply circuit as claimed in any one of claims 1 to 9, wherein a power supply output end of the direct-current power supply circuit is connected with a power supply input end of the test device, and a signal end of the test device is connected with a signal end of the television board card.
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| CN202010265854.8A CN111405275B (en) | 2020-04-07 | 2020-04-07 | DC power supply circuit and television board card test system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113110122A (en) * | 2021-03-10 | 2021-07-13 | 深圳市金锐显数码科技有限公司 | Wireless control circuit and wireless controller |
| CN113296028A (en) * | 2021-05-25 | 2021-08-24 | 佛山市顺德区美的电子科技有限公司 | Direct current load fault detection circuit and household appliance with same |
| CN113300331A (en) * | 2021-06-01 | 2021-08-24 | 中车大连电力牵引研发中心有限公司 | Power supply board card with voltage monitoring function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203301611U (en) * | 2013-06-06 | 2013-11-20 | 深圳Tcl新技术有限公司 | Direct-current switching circuit and switching power source |
| US20170187287A1 (en) * | 2015-07-07 | 2017-06-29 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | Power converter and switching power supply device |
| WO2018006769A1 (en) * | 2016-07-08 | 2018-01-11 | 上海电科电器科技有限公司 | Hysteresis power supply circuit |
| CN209841987U (en) * | 2019-03-07 | 2019-12-24 | 深圳市金锐显数码科技有限公司 | Detection circuit and detection device for anode and cathode of electrolytic capacitor |
| CN211860377U (en) * | 2020-04-07 | 2020-11-03 | 深圳市金锐显数码科技有限公司 | Direct current power supply circuit and television board card test system |
-
2020
- 2020-04-07 CN CN202010265854.8A patent/CN111405275B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203301611U (en) * | 2013-06-06 | 2013-11-20 | 深圳Tcl新技术有限公司 | Direct-current switching circuit and switching power source |
| US20170187287A1 (en) * | 2015-07-07 | 2017-06-29 | Shenzhen Skyworth-Rgb Electronic Co., Ltd. | Power converter and switching power supply device |
| WO2018006769A1 (en) * | 2016-07-08 | 2018-01-11 | 上海电科电器科技有限公司 | Hysteresis power supply circuit |
| CN209841987U (en) * | 2019-03-07 | 2019-12-24 | 深圳市金锐显数码科技有限公司 | Detection circuit and detection device for anode and cathode of electrolytic capacitor |
| CN211860377U (en) * | 2020-04-07 | 2020-11-03 | 深圳市金锐显数码科技有限公司 | Direct current power supply circuit and television board card test system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113110122A (en) * | 2021-03-10 | 2021-07-13 | 深圳市金锐显数码科技有限公司 | Wireless control circuit and wireless controller |
| CN113296028A (en) * | 2021-05-25 | 2021-08-24 | 佛山市顺德区美的电子科技有限公司 | Direct current load fault detection circuit and household appliance with same |
| CN117607749A (en) * | 2021-05-25 | 2024-02-27 | 佛山市顺德区美的电子科技有限公司 | Direct current load fault detection circuit and household electrical appliance with same |
| CN113296028B (en) * | 2021-05-25 | 2024-03-08 | 佛山市顺德区美的电子科技有限公司 | Direct current load fault detection circuit and household electrical appliance with same |
| CN117607749B (en) * | 2021-05-25 | 2025-06-24 | 佛山市顺德区美的电子科技有限公司 | DC load fault detection circuit and household appliance having the same |
| CN113300331A (en) * | 2021-06-01 | 2021-08-24 | 中车大连电力牵引研发中心有限公司 | Power supply board card with voltage monitoring function |
| CN113300331B (en) * | 2021-06-01 | 2024-10-18 | 中车大连电力牵引研发中心有限公司 | Power supply board with voltage monitoring function |
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