CN216121901U - Redundant circuit, redundant power supply and display device - Google Patents

Abstract

The utility model relates to a redundant circuit, which comprises a direct-current power supply input end, a load connecting end, an auxiliary power supply connecting end, a first conducting switch, a second conducting switch and a third conducting switch, wherein the first conducting switch is connected with the load connecting end; the first controlled end of the first conduction switch is connected with the auxiliary power supply connecting end, the first current input end of the first conduction switch is connected with the direct-current power supply input end, and the first current output end of the first conduction switch is connected with the load connecting end; the second controlled end of the second conduction switch is connected with the direct-current power supply input end and the first current input end, and the second current output end of the second conduction switch is grounded; the third controlled end of the third conduction switch is connected with the auxiliary power supply connecting end and the second current input end, the third current input end of the third conduction switch is connected with the auxiliary power supply connecting end and the first controlled end, and the third current output end of the third conduction switch is connected with the direct current power supply input end, the second controlled end and the first power supply input end. The redundancy circuit can play a role of redundancy backup in a power supply of the display equipment, and meanwhile, when the power supply is in no-load, the power consumption is low.

Description

Redundant circuit, redundant power supply and display device

Technical Field

The utility model relates to the technical field of switching power supply circuits, in particular to a redundant circuit, a redundant power supply and display equipment.

Background

In recent years, LEDs (Light Emitting diodes) are widely used as a green and energy-saving Light source in lighting systems and in the field of home appliances for backlight display of display devices. In order to improve the power supply stability of the display device, the display device is usually provided with a redundant power supply, which includes at least two power supplies, and when one of the power supplies fails, the other power supply can be immediately switched on to supply power, so that the power supply of the display device is uninterrupted.

The key point of the redundant power supply is the redundant circuit, which is usually used as shown in fig. 1. The redundancy circuit comprises a switch tube, a comparator and a voltage regulator tube; the input end of the switching tube is connected to the output end of a first power supply of the redundant power supply, the output end of the switching tube is connected to a display equipment load, and the enable end of the switching tube is connected to the output end of the comparator; the non-inverting input of the comparator is connected to the output of the first power supply and the inverting input of the comparator is connected to the display device load. When the redundancy circuit works normally, the voltage of the non-inverting input end of the comparator is higher than that of the inverting input end of the comparator, and high level is output to the enabling end of the switch tube to drive the switch tube to be conducted. When the first power supply of the redundant power supply has short circuit and other faults and has no voltage output, the voltage of the in-phase input end of the comparator is lower than that of the reverse-phase input end, the comparator outputs low level at the moment, and the switching tube cannot be driven to be conducted, so that the switching tube plays an isolation role, and the influence of the power supply fault on the load of the display equipment is avoided.

However, in the redundant power supply, the comparator is an active integrated circuit chip, and the comparator still needs to work continuously during no-load, so that a certain static working current is consumed, and the no-load power consumption is large, and the no-load low-power consumption requirement of the redundant power supply cannot be met.

SUMMERY OF THE UTILITY MODEL

Based on the above, the utility model provides a redundant circuit, a redundant power supply and a display device, wherein the redundant circuit can play a role of redundant backup in a power supply of the display device, and meanwhile, when the power supply is in no-load state, the power consumption is small.

According to a first aspect of the present invention, there is provided a redundancy circuit, comprising a dc power supply input terminal, a load connection terminal, an auxiliary power supply connection terminal, a first conduction switch, a second conduction switch and a third conduction switch;

the first conduction switch comprises a first controlled end, a first current input end and a first current output end, the first controlled end is connected with the auxiliary power supply connecting end, the first current input end is connected with the direct current power supply input end, and the first current output end is connected with the load connecting end;

the second conduction switch comprises a second controlled end, a second current input end and a second current output end, the second controlled end is connected with the direct current power supply input end and the first current input end, and the second current output end is grounded;

the third switch-on switch comprises a third controlled end, a third current input end and a third current output end, the third controlled end is connected with the auxiliary power supply connecting end and the second current input end, the third current input end is connected with the auxiliary power supply connecting end and the first controlled end, and the third current output end is connected with the direct current power supply input end, the second controlled end and the first power supply input end.

In an optional embodiment, the power supply further includes a first voltage dividing resistor, and the second current input terminal is connected to the third controlled terminal and then connected to the auxiliary power supply connection terminal through the first voltage dividing resistor.

In an optional embodiment, the power supply further includes a second voltage-dividing resistor, and the first controlled terminal is connected to the third current input terminal and then connected to the auxiliary power supply connection terminal through the second voltage-dividing resistor.

In an optional embodiment, the power supply further includes a fourth conducting switch, the fourth conducting switch includes a fourth controlled terminal, a fourth current input terminal and a fourth current output terminal, the fourth controlled terminal is connected to the first current output terminal and the load connection terminal, the fourth current input terminal is connected to the third current input terminal and the first controlled terminal and is connected to the auxiliary power supply connection terminal through the second voltage-dividing resistor, and the fourth current output terminal is connected to the dc power supply input terminal, the second controlled terminal, the third current output terminal and the first current input terminal.

In an alternative embodiment, the first conduction switch is an N-channel type field effect transistor; the first current input end is a source electrode of the field effect transistor, the first current output end is a drain electrode of the field effect transistor, and the first controlled end is a grid electrode of the field effect transistor.

In an optional embodiment, the second conducting switch is a first transistor, the second controlled terminal is a base of the first transistor, the second current input terminal is a collector of the first transistor, and the second current output terminal is an emitter of the first transistor.

In an optional embodiment, the third conducting switch is a second triode, the third controlled terminal is a base of the second triode, the third current input terminal is a collector of the second triode, and the third current output terminal is an emitter of the second triode.

In an optional embodiment, the fourth conducting switch is a third transistor, the fourth controlled terminal is a base of the third transistor, the fourth current input terminal is a collector of the third transistor, and the fourth current output terminal is an emitter of the third transistor.

According to a second aspect of the present invention, there is provided a redundant power supply, comprising at least two power conversion circuits, and at least two redundant circuits as described in any one of the above embodiments; the redundant circuits correspond to the power supply conversion circuits one to one;

the power supply conversion circuit comprises an alternating current power supply input end and a direct current power supply output end;

the direct current power supply output end is connected with the direct current power supply input end and the auxiliary power supply connecting end.

According to a third aspect of the present invention, there is provided a display device comprising the redundant power supply and LED load of the second aspect of the present invention; the LED load is connected to the load connection end of the redundant circuit.

In the redundant circuit, the conduction state of the first conduction switch is controlled by the mutual matching of the second conduction switch and the third conduction switch, so that the power supply control of the redundant power supply is realized, and no active device is used, so that the no-load power consumption of the redundant power supply is lower.

For a 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 diagram of a redundancy circuit according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a redundancy circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a redundant power supply according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a display device in 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 utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the relevant aspects 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", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, 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.

The utility model provides a redundant circuit which can realize power supply control of a redundant power supply and does not use an active device, so that the no-load power consumption of the redundant power supply is lower.

As shown in fig. 1, in one embodiment, the redundancy circuit of the present invention includes a dc power input terminal VIN, a load connection terminal VOUT, an auxiliary power connection terminal VCC1, a first conducting switch 1, a second conducting switch 2, and a third conducting switch 3.

The input end VIN of the dc power supply is used for being connected with the output end of the power conversion circuit of the redundant power supply to obtain a dc power supply, specifically a dc power supply smaller than + 12V. The load connection end VOUT is used for outputting direct-current voltage for supplying power to the LED load, and can also be used for supplying power to other components in the display equipment. And the auxiliary power supply connecting end VCC1 is used for connecting the output end of the power supply conversion circuit of the redundant power supply to obtain the working power supply of the redundant circuit.

First switch 1 includes first controlled end 11, first current input end 12 and first current output end 13, first controlled end 11 with auxiliary power supply connection VCC1 is connected, first current input end 12 with DC power supply input end VIN is connected, first current output end 13 with load connection end VOUT is connected, promptly first switch 1's first current input end 12 and first current output end 13 establish ties between DC power supply input VIN and load connection end VOUT, play the effect of switch and isolation. The first conducting switch 1 conducts or cuts off the first current input end 12 and the first current output end 13 according to a first driving signal received by a first controlled end 11, and the first conducting switch 1 may be a controllable precise voltage regulator, a triode, a field effect transistor and other switching devices.

The second conducting switch 2 includes a second controlled end 21, a second current input end 22 and a second current output end 23, the second controlled end 21 is connected to the dc power input end VIN and the first current input end 12, and the second current output end 23 is grounded. The second conducting switch 2 conducts or cuts off the second current input terminal 22 and the second current output terminal 23 according to a second driving signal received by a second controlled terminal 21, and the second conducting switch 2 may be a switching device such as a triode.

The third conducting switch 3 comprises a third controlled end 31, a third current input end 32 and a third current output end 33, the third controlled end 31 is connected with the auxiliary power connection end VCC1 and the second current input end 22, the third current input end 32 is connected with the auxiliary power connection end VCC1 and the first controlled end 11, and the third current output end 33 is connected with the dc power input end VIN, the second controlled end 21 and the first current input end 12. The third conducting switch 3 conducts or cuts off the third current input terminal 32 and the third current output terminal 33 according to a third driving signal received by a third controlled terminal 31, and the third conducting switch 3 may be a switching device such as a triode.

The working principle of the embodiment is as follows:

when the redundant power supply works normally and the load connection end is connected with a load, the second current input end 22 of the second conducting switch 2 is connected with the third controlled end 31 of the third conducting switch 3, because the direct current power supply output end of the power conversion circuit outputs power, the voltage of the second controlled end 21 of the second conducting switch 2 is higher than the voltage of the second current output end 23, namely the voltage difference value between the second controlled end 21 and the second current output end 23 is larger than the conducting voltage of the second conducting switch 2, the second conducting switch 2 is conducted, so that the third controlled end 31 of the third conducting switch 3 is connected to the ground, the voltage of the third controlled end 31 of the third conducting switch 3 is lower than the voltage of the third current output end 33, the third conducting switch 3 is cut off, so that the first controlled end 11 of the first conducting switch 1 is connected to the auxiliary power supply to conduct the first conducting switch 1, and switching on a power supply circuit between the input end VIN of the direct-current power supply and the load connecting end to supply power to the rear-end load.

When the redundant power supply fails and the output voltage is 0, the voltage of the second controlled end 21 of the second conduction switch 2 is 0, and cannot be conducted, at this time, the third controlled end 31 of the third conduction switch 3 can be connected to the auxiliary power supply to obtain the conduction of the driving signal, so that the voltage of the first controlled end 11 of the first conduction switch 1 is pulled down, the voltage difference value between the first controlled end 11 of the first conduction switch 1 and the first current input end 12 cannot reach the preset conduction voltage, the first conduction switch 1 is turned off, and the power supply circuit between the direct current power supply input end VIN and the load connection end VOUT is cut off to stop supplying power to the rear-end load.

The direct current power supply output by the power conversion circuit is used as a control signal of the second conduction switch, and the conduction or the cut-off of the first conduction switch is controlled through the mutual matching of the third conduction switch, so that when the power conversion circuit or the power supply fails to supply power, the first conduction switch is turned off, and the influence of power failure on the load of the display equipment is prevented.

The redundant circuit can realize power supply control of the redundant power supply, and does not use an active device, so that the no-load power consumption of the redundant power supply is lower, and the electric energy is saved.

In an alternative embodiment, as shown in fig. 2, the driving circuit further includes a first voltage dividing resistor R1, and after the second current input terminal 22 is connected to the third controlled terminal 31, the second current input terminal is connected to the auxiliary power connection terminal VCC1 through the first voltage dividing resistor R1 to obtain the driving signal. The auxiliary power supply connection terminal VCC1 can be connected to +12V dc power supply, and the first divider resistor R1 can divide the voltage of +12V dc power supply, so that the second controlled terminal 21 of the second conducting switch 2 obtains a voltage that does not exceed its working voltage limit, and the second conducting switch 2 is protected.

In an alternative embodiment, as shown in fig. 2, the driving circuit further includes a second voltage dividing resistor R2, and after the first controlled terminal 11 is connected to the third current input terminal 32, the second voltage dividing resistor R2 is connected to the auxiliary power connection terminal VCC1 to obtain the driving signal. The auxiliary power supply connection terminal VCC1 can be connected to +12V dc power supply, and the second divider resistance R2 can divide the voltage of +12V dc power supply, thereby making the first controlled end 11 of the first conducting switch 1 obtain the voltage that will not exceed its working voltage limit, playing the role of protecting the first conducting switch 1.

In an alternative embodiment, as shown in fig. 2, the first conducting switch 1 is an N-channel fet Q1; the first current input end 12 is a source electrode S of the field effect transistor, the first current output end 13 is a drain electrode D of the field effect transistor, and the first controlled end 11 is a gate G of the field effect transistor.

In an alternative embodiment, as shown in fig. 2, the second conducting switch 2 is a first transistor Q2, the second controlled terminal 21 is a base B of the first transistor, the second current input terminal 22 is a collector C of the first transistor, and the second current output terminal 23 is an emitter E of the first transistor.

In an alternative embodiment, as shown in fig. 2, the third conducting switch 3 is a second transistor Q3, the third controlled terminal 31 is a base B of the second transistor, the third current input terminal 32 is a collector C of the second transistor, and the third current output terminal 33 is an emitter E of the second transistor.

In an alternative embodiment, as shown in fig. 2, when the power supply connected to the dc power supply input fails to supply power, the redundant power supply may supply power to the load through other power conversion circuits, and at this time, the voltage at the load connection terminal may exceed the voltage at the dc power supply input terminal, and a current backflow phenomenon may occur, so that the redundant circuit further includes a fourth conducting switch Q4.

The fourth conducting switch Q4 includes a fourth controlled terminal, a fourth current input terminal and a fourth current output terminal, the fourth controlled terminal is connected to the first current output terminal and the load connection terminal, the fourth current input terminal is connected to the third current input terminal and the first controlled terminal and is connected to the auxiliary power supply connection terminal through the second voltage-dividing resistor, and the fourth current output terminal is connected to the dc power supply input terminal, the second controlled terminal, the third current output terminal and the first current input terminal. When the voltage of the load connecting end is higher than the voltage of the direct-current power supply input end, the voltage difference between the voltage of the fourth controlled end of the fourth conduction switch Q4 and the voltage of the fourth current input end is higher than the preset conduction voltage of the fourth conduction switch, the fourth conduction switch is conducted, the voltage of the first controlled end is pulled down to enable the first conduction switch 1 to be conducted, the power supply circuit between the direct-current power supply input end and the load connecting end is cut off, and therefore the current reverse-flowing is prevented from achieving the effect of protecting the standby power supply.

In an alternative embodiment, as shown in fig. 2, the fourth conducting switch 4 is a third transistor Q4, the fourth controlled terminal 41 is a base B of the third transistor, the fourth current input terminal 42 is a collector C of the third transistor, and the fourth current output terminal 43 is an emitter E of the third transistor.

In the redundant circuit, the conduction state of the first conduction switch is controlled by the mutual matching of the second conduction switch and the third conduction switch, so that the power supply control of the redundant power supply is realized, and no active device is used, so that the no-load power consumption of the redundant power supply is lower.

The present invention also provides a redundant power supply, as shown in fig. 3, the redundant power supply includes at least two power conversion circuits 301, and at least two redundant circuits 302 according to any of the above embodiments; the redundant circuits 302 correspond to the power conversion circuits 301 one to one;

the power conversion circuit 301 has an ac power input terminal and a dc power output terminal;

the direct current power supply output end is connected with the direct current power supply input end and the auxiliary power supply connecting end.

The load connecting end of the redundant circuit 302 is connected with an LED load 303, in the redundant power supply, if one of the power conversion circuits fails and cannot supply power, the first switch-on switch of the corresponding redundant circuit is switched off to disconnect the power supply circuit, and meanwhile, the other power conversion circuit supplies power continuously, so that the LED display equipment realizes uninterrupted power supply, the power consumption is low during no-load, and the electric energy is saved.

The present invention further provides a display device, as shown in fig. 4, the display device 50 includes a driving board 40 and an LED load 51, wherein the driving board 40 is provided with the redundant power supply 41 as described in the above embodiments, and the LED load 51 is connected to a load connection terminal of a redundant circuit of the redundant power supply 41.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims (10)

1. A redundancy circuit, characterized by: the power supply comprises a direct-current power supply input end, a load connecting end, an auxiliary power supply connecting end, a first conduction switch, a second conduction switch and a third conduction switch;

the first conduction switch comprises a first controlled end, a first current input end and a first current output end, the first controlled end is connected with the auxiliary power supply connecting end, the first current input end is connected with the direct current power supply input end, and the first current output end is connected with the load connecting end;

the second conduction switch comprises a second controlled end, a second current input end and a second current output end, the second controlled end is connected with the direct current power supply input end and the first current input end, and the second current output end is grounded;

the third switch-on switch comprises a third controlled end, a third current input end and a third current output end, the third controlled end is connected with the auxiliary power supply connecting end and the second current input end, the third current input end is connected with the auxiliary power supply connecting end and the first controlled end, and the third current output end is connected with the direct current power supply input end, the second controlled end and the first power supply input end.

2. The redundancy circuit of claim 1, wherein: the second current input end is connected with the third controlled end, and then is connected to the auxiliary power supply connecting end through the first divider resistor.

3. The redundancy circuit of claim 1, wherein: the first controlled end is connected with the third current input end and then is connected to the auxiliary power supply connecting end through a second voltage-dividing resistor.

4. The redundancy circuit of claim 3, wherein: still include the fourth switch on, the fourth switch on includes fourth controlled end, fourth current input end and fourth current output end, the fourth controlled end with first current output end and the load link is connected, the fourth current input end with third current input end and first controlled end is connected, and passes through the second divider resistor is connected to the auxiliary power source link, the fourth current output end with DC power supply input end, second controlled end, third current output end and first current input end are connected.

5. The redundancy circuit of claim 1, wherein: the first conduction switch is an N-channel field effect transistor; the first current input end is a source electrode of the field effect transistor, the first current output end is a drain electrode of the field effect transistor, and the first controlled end is a grid electrode of the field effect transistor.

6. The redundancy circuit of claim 1, wherein: the second conduction switch is a first triode, the second controlled end is a base electrode of the first triode, the second current input end is a collector electrode of the first triode, and the second current output end is an emitter electrode of the first triode.

7. The redundancy circuit of claim 1, wherein: the third conduction switch is a second triode, the third controlled end is a base electrode of the second triode, the third current input end is a collector electrode of the second triode, and the third current output end is an emitter electrode of the second triode.

8. The redundancy circuit of claim 4, wherein: the fourth conducting switch is a third triode, the fourth controlled end is a base electrode of the third triode, the fourth current input end is a collector electrode of the third triode, and the fourth current output end is an emitter electrode of the third triode.

9. A redundant power supply, characterized by: comprising at least two power conversion circuits, and at least two redundant circuits according to any of claims 1 to 8; the redundant circuits correspond to the power supply conversion circuits one to one;

the power supply conversion circuit comprises an alternating current power supply input end and a direct current power supply output end;

the direct current power supply output end is connected with the direct current power supply input end and the auxiliary power supply connecting end.

10. A display device characterized by: comprising the redundant power supply of claim 9 and an LED load; the LED load is connected to the load connection end of the redundant circuit.

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