Power supply circuit of video switcher

Abstract

The utility model discloses a power supply circuit of a video switcher, which relates to the technical field of power supply circuits and comprises a rectifier bridge and an output capacitor, the output end of the rectifier bridge is connected with a filter capacitor, and the output end of the filter capacitor is connected with a voltage stabilizing IC (integrated circuit). When the power supply circuit of the video switcher is used, firstly, AC220V voltage is connected to the output end of the power supply, alternating current can be converted into direct current through the rectifier bridge, and then the current can be filtered and stabilized through the filter capacitor, the voltage stabilizing IC and the output capacitor. The power supply can transmit stable voltage to the video switcher through the output end of the power supply, the voltage can be clamped through the Zener diode Z6 when the power supply is used and the voltage is too large so as to play a role in overvoltage protection, and the circuit can be protected through fusing of the fuse FU when the current is too large. Therefore, the power supply circuit is not easy to damage, and the service life of the whole power supply circuit is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply circuit technical field, concretely is a kind of power supply circuit of video switcher. BACKGROUND

[0002] In order to make video switcher can work normally, it needs to use power supply to power video switcher, so the power supply of video switcher is very important for video switcher, can provide stable circuit for video switcher, guarantee the stable work of video switcher.

[0003] The existing video switcher power supply circuit is connected with zener diode when using to ensure the stability of output voltage, but when the voltage inside circuit is too high, just rely on a group of zener diode will make the overvoltage protection effect of circuit be influenced, and there is no any overcurrent protection component connected in circuit, when current is too large, will cause damage to circuit, therefore not have the effect of good overvoltage protection and overcurrent protection. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of power supply circuit of video switcher to solve the problem of not having good overvoltage protection and overcurrent protection of the video switcher power supply circuit used at present proposed in the above background art.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of power supply circuit of video switcher, comprising: rectifier bridge and output capacitor, the output end of the rectifier bridge is connected with filter capacitor, the output end of the filter capacitor is connected with voltage stabilizing IC, and the output capacitor is connected in the output end of voltage stabilizing IC;

[0006] The input end of power supply circuit is connected with AC220V voltage, the rectifier bridge includes diode Z1, diode Z2, diode Z3 and diode Z4, the filter capacitor includes capacitor C1, the voltage stabilizing IC includes resistance R1 and zener diode Z5, and the output capacitor includes capacitor C2 and capacitor C3.

[0007] Preferably, the filter capacitor is connected in parallel with the output end of rectifier bridge.

[0008] Preferably, the output end of the output capacitor is connected with fuse FU.

[0009] Preferably, the output end of the fuse FU is connected with zener diode Z6.

[0010] Preferably, the zener diode Z6 is connected between the output end of power supply circuit and ground end.

[0011] Preferably, the fuse FU is connected in the output end of power supply circuit.

[0012] Compared with the prior art, the power supply circuit of the video switcher has the use characteristics that: when the power supply circuit is used, AC220V voltage is connected to the output end of the power supply first, and the AC voltage can be converted into DC voltage through the rectifier bridge, and then the current can be filtered and stabilized through the filter capacitor, the voltage stabilizing IC and the output capacitor, so that the power supply can transmit the stable voltage to the video switcher through the output end of the power supply, and when the voltage is too large during use, the voltage can be clamped through the Zener diode Z6, thereby playing a role of overvoltage protection, and when the current is too large, the protection effect of the circuit can be realized through the fusing of the fuse FU, so that the power supply circuit is not prone to damage, the service life of the entire power supply circuit is increased, and this is the use characteristics of the power supply circuit of the video switcher. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the power supply circuit structure of the utility model.

[0014] In the figure: 1, rectifier bridge; 2, filter capacitor; 3, voltage stabilizing IC; 4, output capacitor. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0016] Please refer to Figure 1 The utility model provides a kind of technical solutions: a kind of power supply circuit of video switcher, comprising: rectifier bridge 1 and output capacitor 4, the output end of rectifier bridge 1 is connected with filter capacitor 2, the output end of filter capacitor 2 is connected with voltage stabilizing IC 3, and output capacitor 4 is connected in the output end of voltage stabilizing IC 3;

[0017] The input end of power supply circuit is connected with AC220V voltage, rectifier bridge 1 includes diode Z1, diode Z2, diode Z3 and diode Z4, filter capacitor 2 includes capacitor C1, voltage stabilizing IC 3 includes resistance R1 and voltage stabilizing diode Z5, and output capacitor 4 includes capacitor C2 and capacitor C3, filter capacitor 2 is connected in parallel at the output end of rectifier bridge 1, the output end of output capacitor 4 is connected with fuse FU, the output end of fuse FU is connected with Zener diode Z6, Zener diode Z6 is connected between the output end of power supply circuit and ground end, and fuse FU is connected at the output end of power supply circuit.

[0018] In the specific implementation, the power supply circuit of the video switcher can be connected to AC 220V voltage at the input end of the power supply in use, so that the entire power supply circuit can work normally, and the rectifier bridge 1 is connected to the input end of the power supply, so that the diodes Z1 and Z3 at the upper and lower ends are connected to the direct current output end, and the diodes Z2 and Z4 at the left and right sides are connected to the alternating current input end. When the voltage of the alternating current input is positive half cycle, the current flows through the diodes Z1 and Z3; when the voltage of the alternating current input is negative half cycle, the current flows through the diodes Z2 and Z4. In this way, no matter how the direction of the input alternating current voltage changes, the output end can always obtain unidirectional direct current. The alternating current can be converted into direct current through the rectifier bridge 1, and then the current can pass through the capacitor C1 in the filter capacitor 2. The capacitor C1 can smooth the rectified direct current and reduce the ripple of the direct current. After the current flows through the capacitor C1, it will pass through the voltage stabilizing IC 3, which mainly consists of the resistor R1 and the voltage stabilizing diode Z5. The resistor R1 and the voltage stabilizing diode Z5 can provide a stable 5V output voltage for the power supply. Finally, the current will pass through the output capacitor 4, which mainly consists of the capacitors C2 and C3. The capacitors C2 and C3 can further filter the direct current to ensure the stability of the output current. At the same time, a zener diode Z6 is also connected between the output end and the ground end of the power supply. The zener diode Z6 is mainly used to provide precise voltage clamping function. When the output voltage exceeds the set value, the voltage is clamped, thereby playing a role in protecting the circuit and avoiding damage to the circuit caused by excessive voltage. An fuse FU is also connected to the output end of the circuit. The fuse FU can avoid damage caused by excessive current in the circuit, and ensure that the fuse can cut off the circuit in time if the load is short-circuited or other faults cause the current to surge, thereby also playing a role in protecting the circuit.

[0019] Referring to Figure 1 It can be seen that, in use, the zener diode Z6 between the output end and the ground end of the entire circuit can play a role in overvoltage protection of the power supply circuit, and the fuse FU at the output end of the circuit can play a role in overcurrent protection of the power supply circuit.

[0020] To sum up: the power supply circuit of the video switcher can be connected with AC 220V voltage at the output end in use, then the alternating current can be converted into direct current through the rectifier bridge 1, the direct current can be smoothed through the filter capacitor 2, the ripple can be reduced, the direct current after smoothing can pass through the voltage stabilizing IC 3, the voltage stabilizing IC 3 mainly provides stable output voltage for the power supply, finally the current is filtered through the output capacitor 4, after filtering, the video switcher can be transmitted through the output end, thereby meeting the power supply demand of the video switcher, which is the use characteristics of the power supply circuit of the video switcher, the contents not described in detail in the description belong to the prior art known to the person skilled in the art.

[0021] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A power supply circuit for a video switcher, comprising: The rectifier bridge (1) and the output capacitor (4) are characterized in that: the output terminal of the rectifier bridge (1) is connected to a filter capacitor (2), the output terminal of the filter capacitor (2) is connected to a voltage regulator IC (3), and the output capacitor (4) is connected to the output terminal of the voltage regulator IC (3). The input terminal of the power supply circuit is connected to AC220V voltage. The rectifier bridge (1) includes diodes Z1, Z2, Z3 and Z4. The filter capacitor (2) includes capacitor C1. The voltage regulator IC (3) includes resistor R1 and voltage regulator diode Z5. The output capacitor (4) includes capacitors C2 and C3. The output terminal of the output capacitor (4) is connected to a fuse FU; The output terminal of the fuse FU is connected to a Zener diode Z6. The Zener diode Z6 is connected between the power supply circuit output terminal and the ground terminal.

2. The power supply circuit for a video switcher according to claim 1, characterized in that: The filter capacitor (2) is connected in parallel to the output terminal of the rectifier bridge (1).

3. The power supply circuit for a video switcher according to claim 1, characterized in that: The fuse FU is connected to the output terminal of the power supply circuit.

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