CN213185869U - Power failure accelerating circuit, power supply circuit, driving board card and electronic equipment - Google Patents
Power failure accelerating circuit, power supply circuit, driving board card and electronic equipment Download PDFInfo
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- CN213185869U CN213185869U CN202021576062.4U CN202021576062U CN213185869U CN 213185869 U CN213185869 U CN 213185869U CN 202021576062 U CN202021576062 U CN 202021576062U CN 213185869 U CN213185869 U CN 213185869U
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Abstract
The utility model relates to a circuit, power supply circuit, drive integrated circuit board and electronic equipment fall with higher speed. In the accelerated power down circuit of the present invention, the input terminals of the first voltage sampling unit and the second voltage sampling unit are respectively connected to the first voltage output terminal and the second voltage output terminal of the power supply circuit, and the output terminal of the first voltage sampling unit is connected to the output terminal of the second voltage sampling unit through the first resistor; the first conduction switch comprises a current input end connected with the output end of the second voltage sampling unit, a controlled end connected with the output end of the first voltage sampling unit and a current output end; the second conduction switch comprises a current input end connected with the dummy load, a controlled end connected with the first current output end and a grounded current output end; the dummy load is connected to the second voltage output terminal. The utility model discloses a fall circuit with higher speed and make terminal equipment when standby or soft shutdown, can keep the voltage output of setting for, avoided wherein voltage degree of depth of the same kind to fall the system shutdown that leads to terminal equipment.
Description
Technical Field
The utility model relates to an electronic circuit's technical field especially relates to a fall circuit, power supply circuit, drive integrated circuit board and electronic equipment with higher speed.
Background
In a conventional power circuit, multiple dc power outputs are usually included, and the multiple dc power outputs are feedback-controlled by the same feedback control circuit. As shown in fig. 1, in the example of the power supply circuit and the feedback control circuit thereof in the example of fig. 1, V1 and V2 are two-way dc power supplies outputted from the power supply circuit, and the feedback control circuit in fig. 1 performs feedback control of voltage.
When the system is in soft shutdown or standby, because one of the voltage outputs, for example, the output of V2 has no load, the voltage of the voltage is slowly powered down, which may cause the deep power down of the voltage of V1 but the feedback control circuit cannot perform feedback regulation, so that the system cannot work when powered down.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides a circuit, power supply circuit, drive integrated circuit board and electronic equipment fall with higher speed for terminal equipment can keep the voltage output of setting for when standby or soft shutdown, has avoided wherein voltage degree of depth of the same kind to fall the system that leads to terminal equipment and shut down.
In a first aspect, the utility model provides a circuit falls with higher speed is applied to power supply circuit, power supply circuit includes first voltage output end and second voltage output end, include:
the circuit comprises a first voltage sampling unit, a second voltage sampling unit, a first resistor, a first conducting switch, a second resistor, a second conducting switch and a dummy load;
the input end of the first voltage sampling unit is connected with the first voltage output end, the input end of the second voltage sampling unit is connected with the second voltage output end, and the output end of the first voltage sampling unit is connected with the output end of the second voltage sampling unit through the first resistor;
the first conducting switch comprises a first current input end connected with the output end of the second voltage sampling unit, a first controlled end connected with the output end of the first voltage sampling unit and a first current output end, the first current output end is grounded through the second resistor, and when the voltage of the first current input end is greater than the voltage of the first controlled end and exceeds a set value, the first conducting switch is conducted;
the second conducting switch comprises a second current input end connected with the first end of the dummy load, a second controlled end connected with the first current output end and a second current output end used for grounding, and the second conducting switch is conducted when the voltage of the second controlled end is greater than the voltage of the second current output end and exceeds a set value;
the second end of the dummy load is connected with the second voltage output end.
Optionally, the current source further comprises a capacitor, a first end of the capacitor is connected to the first current output end, and a second end of the capacitor is grounded.
Optionally, the dummy load includes a third resistor, a first end of the third resistor is connected to the second current input terminal, and a second end of the third resistor is connected to the second voltage output terminal.
Optionally, the first voltage sampling unit includes a fourth resistor and a fifth resistor, the fourth resistor and the fifth resistor are connected in series between the first voltage output end and ground, and the output end of the first voltage sampling unit is a common connection end between the fourth resistor and the fifth resistor.
Optionally, the second voltage sampling unit includes a sixth resistor and a seventh resistor, the sixth resistor and the seventh resistor are connected in series between the second voltage output terminal and ground, and the output terminal of the second voltage sampling unit is a common connection terminal between the sixth resistor and the seventh resistor.
Optionally, the first conduction switch is a PNP-type triode, the first current input terminal is an emitter of the triode, the first controlled terminal is a base set of the triode, and the first current output terminal is a collector of the triode.
Optionally, the second conduction switch is an N-channel fet, the second current input terminal is a drain of the fet, the second controlled terminal is a gate of the fet, and the second current output terminal is a source of the fet.
In a second aspect, the present invention provides a power circuit, comprising a main power circuit and an accelerated power-down circuit as described in the first aspect of the present invention;
the power supply main circuit comprises a first voltage output end and a second voltage output end, the input end of the first voltage sampling unit is connected with the first voltage output end, and the input end of the second voltage sampling unit is connected with the second voltage output end.
Third aspect, the utility model provides a drive integrated circuit board, include the utility model discloses the second aspect power supply circuit.
In a fourth aspect, the present invention provides an electronic device, including a load and the third aspect of the present invention, the driving board, the current input terminal of the load is connected to the first voltage output terminal of the power circuit.
The utility model discloses an accelerated power-down circuit, respectively collect the voltage signal of two voltage output ends V1 and V2 of power supply circuit through first voltage sampling unit and second voltage sampling unit, when terminal equipment is standby or soft-off, when unloaded voltage V2 is greater than voltage V1 with load to a certain value, the first conducting switch is conducted, the second conducting switch obtains control voltage through the first conducting switch, when this control voltage is greater than the conducting voltage of the second conducting switch, the second conducting switch is conducted, the dummy load is connected to the second voltage output end of power supply circuit, make the voltage of second voltage output end V2 cut down with higher speed, through the accelerated power-down circuit of the embodiment of the utility model, the feedback control circuit of power supply circuit can in time carry out feedback regulation to the power-down of the voltage of the same path with load, make terminal equipment when standby or soft-off, the power supply circuit can keep the set voltage output, and the system shutdown of the terminal equipment caused by the deep power failure of one path of voltage is avoided.
For better understanding and implementation, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic circuit diagram of a feedback control circuit of a power circuit according to an example of the prior art;
fig. 2 is a schematic diagram of a circuit structure of an accelerated power-down circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit structure of an accelerated power-down circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a circuit structure of an accelerated power-down circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a power circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a driving board card according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present invention are shown in the drawings.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In the following, several specific embodiments are given for describing the technical solution of the present application in detail. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
In the feedback control circuit of fig. 1, the ON/OFF signal is the standby or soft-OFF signal of the terminal device, and V1 and V2 are two dc power supplies outputted by the power supply circuit, respectively, wherein, the power supply circuit may be an LED driving power supply, or other driving power supplies of the terminal device, such as a power supply board, when the power supply circuit is an LED driving power supply, V1 may be an auxiliary power supply outputted by the LED driving power supply, such as an auxiliary power supply of 5V, 12V or 18V, V2 may be a backlight driving power supply for supplying power to an LED load of the terminal device, when the device is turned OFF, the voltage of V2 has a no-load condition, and maintains a long-time power-OFF state, resulting in a deep power-down of V1. When the power circuit is a power panel of a terminal device, the two paths of V1 and V2 can output 12V and 24V respectively, wherein 24V is used for supplying power to a power amplifier of the whole device, and when the device is shut down, no-load condition exists, and the voltage is maintained not to be powered down for a long time, so that the deep power failure of V1 is caused.
The working principle of the feedback control circuit in fig. 1 is as follows:
when the terminal equipment normally works, the ON/OFF signal is high level, the triode Q3 is conducted, the resistor R19 is connected with the resistor R17 and the resistor R18 in parallel, the voltage of the reference end K of the three-terminal voltage regulator tube U1 is reduced, namely, the voltage of the reference end R of the three-terminal regulator tube U1 is reduced, the voltage value of the reference end R is compared with the internal reference voltage of the three-terminal regulator tube U1, when the voltage value of the reference terminal R is lower than the reference voltage, the voltage between the cathode and the anode of the three-terminal regulator tube U1 is increased, further, the current flowing through the light emitting diode P1A is reduced, so that the collector-emitter dynamic resistance of the optical signal converter P1B corresponding to the light emitting diode P1A is increased, the voltage between the collector and the emitter is increased, and the level of the COMP pin of the switch control chip UB101 of the power supply circuit connected to the feedback signal output terminal is increased, so that the output voltage of the power supply circuit is increased, and the normal voltage is output by the V1 and the V2.
ON the contrary, when the terminal equipment is in standby or soft-OFF, the ON/OFF signal is low level, the triode Q3 is cut OFF, the resistor R19 is not connected in parallel with the resistor R17 and the resistor R18, the voltage of the reference end K of the three-terminal regulator tube U1 is increased, namely the voltage of the reference end R of the three-terminal regulator tube U1 is increased, the voltage value of the reference end R is compared with the internal reference voltage of the three-terminal regulator tube U1, when the voltage value of the reference end R is higher than the reference voltage, the voltage between the cathode and the anode of the three-terminal regulator tube U1 is reduced, further the current flowing through the light emitting diode P1A is increased, then the dynamic resistance of the collector and the emitter of the light signal converter P1B corresponding to the light emitting diode P1A is reduced, the voltage between the collector and the level of the COMP pin of the switch control chip UB101 of the power circuit connected with the feedback signal output end is reduced, thereby the output voltage of the power circuit is, and the standby power consumption requirement of the terminal equipment is met.
When the feedback control circuit is in soft shutdown or standby, because one path of voltage, such as the output of the V2, has no load, the voltage of the path of voltage is slow to power down, which causes the voltage of the reference end R of the three-terminal regulator tube U1 to slowly drop when the voltage of the V1 is deeply powered down, so that the feedback control circuit cannot perform feedback regulation on the deep power down of the voltage of the V1, and the system cannot work when the system is powered down.
To this technical problem, the utility model provides an it falls circuit with higher speed is applied to as shown in FIG. 1's power supply circuit, power supply circuit includes first voltage output V1 and second voltage output V2, in other examples, the utility model discloses an it falls circuit with higher speed also can be applied to other forms, including first voltage output and second voltage output, or more voltage output's power supply circuit.
The utility model discloses fall circuit with higher speed can be used for various terminal equipment's power supply circuit. For example, electronic devices such as televisions and smart panels, and the load may be a backlight light source (for example, an LED light bar) or a power amplifier of the whole device.
In one embodiment, as shown in fig. 2, the power down acceleration circuit includes: the circuit comprises a first voltage sampling unit 1, a second voltage sampling unit 2, a first resistor R1, a first conducting switch 3, a second resistor R2, a second conducting switch 4 and a dummy load 5.
First voltage sampling unit 1 with second voltage sampling unit 2 is used for gathering the voltage signal of two voltage output of power supply circuit respectively, and is specific, the input of first voltage sampling unit 1 is connected with first voltage output V1, the input of second voltage sampling unit 2 is connected with second voltage output V2. The output end of the first voltage sampling unit 1 is connected with the output end of the second voltage sampling unit 2 through the first resistor R1.
The first conduction switch 3 comprises a first current input end connected with the output end of the second voltage sampling unit 2, a first controlled end connected with the output end of the first voltage sampling unit 1 and a first current output end, the first current output end is grounded through the second resistor R2, and when the voltage of the first current input end is greater than that of the first controlled end, the first conduction switch 3 is conducted. The first conducting switch 3 can be a controllable precise voltage-stabilizing source, a triode, a field effect transistor and other switching devices.
The second conducting switch 4 comprises a second current input end connected with the first end of the dummy load 5, a second controlled end connected with the first current output end and a second current output end used for grounding, and when the voltage of the second controlled end is greater than the voltage of the second current output end and exceeds a set value, the second conducting switch 4 is conducted; the second conducting switch 4 may be a controllable precise voltage regulator, a triode, a field effect transistor, or other switching devices.
The second terminal of the dummy load 5 is connected to the second voltage output terminal, and the dummy load may be a resistor or other circuit load element.
The embodiment of the utility model provides a theory of operation does:
when the terminal device normally works, the voltage Va collected by the first voltage sampling unit 1 is substantially the same as the voltage Vb collected by the second voltage sampling unit 2, at this time, the voltage between the first current input end of the first conduction switch 3 and the first controlled end is substantially the same, the first conduction switch 3 is not conducted, the first current output end of the first conduction switch 3 is at a low level, and thus the voltage Vc is 0, so that the second conduction switch 4 is turned off, and the dummy load 5 is not connected into the loop of the second voltage output end V2.
When the terminal equipment is in standby or soft shutdown, the voltage of the first voltage output end V1 is fast in power failure due to the fact that the voltage Vb collected by the second voltage sampling unit 2 is larger than the voltage Va collected by the first voltage sampling unit 1, when the difference value between Vb and Va is larger than the breakover voltage of the first breakover switch 3, the first breakover switch 3 is conducted, the voltage Vc is high level and higher than the breakover voltage of the second breakover switch, the second breakover switch 4 is conducted, the dummy load 5 is connected into a loop of the second voltage output end V2, and the voltage of the second voltage output end V2 is accelerated in power failure.
The utility model discloses an accelerated power-down circuit, respectively collect the voltage signal of two voltage output ends V1 and V2 of power supply circuit through first voltage sampling unit and second voltage sampling unit, when terminal equipment is standby or soft-off, when unloaded voltage V2 is greater than voltage V1 with load to a certain value, the first conducting switch is conducted, the second conducting switch obtains control voltage through the first conducting switch, when this control voltage is greater than the conducting voltage of the second conducting switch, the second conducting switch is conducted, the dummy load is connected to the second voltage output end of power supply circuit, make the voltage of second voltage output end V2 cut down with higher speed, through the accelerated power-down circuit of the embodiment of the utility model, the feedback control circuit of power supply circuit can in time carry out feedback regulation to the power-down of the voltage of the same path with load, make terminal equipment when standby or soft-off, the power supply circuit can keep the set voltage output, and the system shutdown of the terminal equipment caused by the deep power failure of one path of voltage is avoided.
In one embodiment, as shown in fig. 3, the accelerated power-down circuit further includes a capacitor C1, a first terminal of the capacitor C1 is connected to the first current output terminal of the first conducting switch 3, and a second terminal of the capacitor C1 is connected to ground.
In this embodiment, when the difference between Vb and Va is greater than the turn-on voltage of the first turn-on switch 3, the first turn-on switch 3 is turned on, and when the voltage difference makes the voltage Vc not reach the turn-on voltage of the second turn-on switch 4, the voltage V2 charges the capacitor C1 until the voltage Vc is greater than the turn-on voltage of the second turn-on switch 4, the second turn-on switch 4 is turned on, and the dummy load 5 is connected to the loop of the second voltage output terminal V2, so that the voltage of the second voltage output terminal V2 is powered down at an accelerated speed.
By connecting the capacitor C1, the voltage V1 can be detected to be lower than the previously set voltage, but when the amplitude is not large, the voltages of V1 and V2 can be more accurately adjusted through charging and discharging of the capacitor C1, so that the voltage of V1 is more stable.
In one embodiment, as shown in fig. 4, the dummy load includes a third resistor R3, a first end of the third resistor R3 is connected to the second current input terminal of the second conducting switch, and a second end of the third resistor is connected to the second voltage output terminal of the second conducting switch.
In an embodiment, as shown in fig. 4, the first voltage sampling unit includes a fourth resistor R4 and a fifth resistor R5, the fourth resistor R4 and the fifth resistor R5 are connected in series between the first voltage output terminal V1 and ground, and the output terminal of the first voltage sampling unit is a common connection terminal between the fourth resistor R4 and the fifth resistor R5.
In an embodiment, as shown in fig. 4, the second voltage sampling unit includes a sixth resistor R6 and a seventh resistor R7, the sixth resistor R6 and the seventh resistor R7 are connected in series between the second voltage output terminal V2 and ground, and the output terminal of the second voltage sampling unit is a common connection terminal between the sixth resistor R6 and the seventh resistor R7.
In one embodiment, as shown in fig. 4, the first conducting switch is a PNP transistor Q1, the first current input terminal is the emitter E of the transistor Q1, the first controlled terminal is the base set B of the transistor Q1, the first current output terminal is the collector C of the transistor Q1, and the transistor Q1 is turned on when Va-Vb > VEB.
In an embodiment, as shown in fig. 4, the second conducting switch is an N-channel fet Q2, the second current input terminal is the drain D of the fet Q2, the second controlled terminal is the gate G of the fet Q2, the second current output terminal is the source S of the fet Q2, and when Vc > VGS, the fet Q2 is turned on.
Fig. 5 is a schematic structural diagram of a power supply circuit provided by the present invention, which includes a main power supply circuit 51 and an accelerated power-down circuit 52 according to any of the above embodiments.
The power main circuit 51 comprises a first voltage output end V1 and a second voltage output end V2, wherein an input end of the first voltage sampling unit is connected with the first voltage output end V1, and an input end of the second voltage sampling unit is connected with the second voltage output end V2.
Fig. 6 is a schematic structural diagram of the driving board card provided by the present invention, and the driving board card 60 includes a power circuit 61 according to any of the above embodiments.
Fig. 7 is a schematic structural diagram of an electronic device provided by the present invention, where the electronic device 70 includes a load 71 and the driving board 60 according to any of the above embodiments; the current input terminal of the load 71 is connected to the second voltage output terminal V2 of the power supply circuit. In an embodiment, the load 71 may be an LED load or a complete machine power amplifier load.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. The utility model provides a circuit falls in acceleration, is applied to power supply circuit, power supply circuit includes first voltage output and second voltage output, its characterized in that includes:
the circuit comprises a first voltage sampling unit, a second voltage sampling unit, a first resistor, a first conducting switch, a second resistor, a second conducting switch and a dummy load;
the input end of the first voltage sampling unit is connected with the first voltage output end, the input end of the second voltage sampling unit is connected with the second voltage output end, and the output end of the first voltage sampling unit is connected with the output end of the second voltage sampling unit through the first resistor;
the first conducting switch comprises a first current input end connected with the output end of the second voltage sampling unit, a first controlled end connected with the output end of the first voltage sampling unit and a first current output end, the first current output end is grounded through the second resistor, and when the voltage of the first current input end is greater than the voltage of the first controlled end and exceeds a set value, the first conducting switch is conducted;
the second conducting switch comprises a second current input end connected with the first end of the dummy load, a second controlled end connected with the first current output end and a second current output end used for grounding, and the second conducting switch is conducted when the voltage of the second controlled end is greater than the voltage of the second current output end and exceeds a set value;
the second end of the dummy load is connected with the second voltage output end.
2. The power down acceleration circuit according to claim 1, wherein:
the first end of the capacitor is connected with the first current output end, and the second end of the capacitor is grounded.
3. The power down acceleration circuit according to claim 1, wherein:
the dummy load comprises a third resistor, a first end of the third resistor is connected with the second current input end, and a second end of the third resistor is connected with the second voltage output end.
4. The power down acceleration circuit according to claim 1, wherein:
the first voltage sampling unit comprises a fourth resistor and a fifth resistor, the fourth resistor and the fifth resistor are connected in series between the first voltage output end and the ground, and the output end of the first voltage sampling unit is a common connecting end between the fourth resistor and the fifth resistor.
5. The power down acceleration circuit according to claim 1, wherein:
the second voltage sampling unit comprises a sixth resistor and a seventh resistor, the sixth resistor and the seventh resistor are connected in series between the second voltage output end and the ground, and the output end of the second voltage sampling unit is a common connection end between the sixth resistor and the seventh resistor.
6. The power down acceleration circuit according to claim 1, wherein:
the first conduction switch is a PNP type triode, the first current input end is an emitting electrode of the triode, the first controlled end is a base set of the triode, and the first current output end is a collecting electrode of the triode.
7. The power down acceleration circuit according to claim 1, wherein:
the second conduction switch is an N-channel field effect transistor, the second current input end is a drain electrode of the field effect transistor, the second controlled end is a grid electrode of the field effect transistor, and the second current output end is a source electrode of the field effect transistor.
8. A power supply circuit, characterized by:
comprising a power main circuit and an accelerated power down circuit as claimed in any one of claims 1 to 7;
the power supply main circuit comprises a first voltage output end and a second voltage output end, the input end of the first voltage sampling unit is connected with the first voltage output end, and the input end of the second voltage sampling unit is connected with the second voltage output end.
9. A drive integrated circuit board, its characterized in that:
comprising a power supply circuit as claimed in claim 8.
10. An electronic device, characterized in that:
comprising a load and a drive board card according to claim 9;
the current input end of the load is connected with the first voltage output end of the power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021576062.4U CN213185869U (en) | 2020-07-31 | 2020-07-31 | Power failure accelerating circuit, power supply circuit, driving board card and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021576062.4U CN213185869U (en) | 2020-07-31 | 2020-07-31 | Power failure accelerating circuit, power supply circuit, driving board card and electronic equipment |
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| Publication Number | Publication Date |
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| CN213185869U true CN213185869U (en) | 2021-05-11 |
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| CN202021576062.4U Active CN213185869U (en) | 2020-07-31 | 2020-07-31 | Power failure accelerating circuit, power supply circuit, driving board card and electronic equipment |
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| CN (1) | CN213185869U (en) |
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