Adapter secondary side overvoltage protection improvement circuit

Abstract

The utility model relates to the technical field of protection improvement lines, in particular to an adapter secondary side overvoltage protection improvement line. Comprising an optocoupler U1, a resistor R1, a resistor R2, a diode ZD1, a triode Q1 and an output end Vout. The optocoupler U1 is connected with the output end Vout through a resistor R2; the diode ZD1 is connected to the base electrode of the triode Q1, and the diode ZD1 is connected with the output end Vout; the secondary side overvoltage protection improvement circuit of the adapter can ensure that the voltage signal of the secondary side is effectively fed back to the primary side when the preset constant voltage value of the output end is ensured, and after the primary side controller receives the feedback signal of the secondary side, the overvoltage protection is triggered, and finally the product is protected. And no influence on the product is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of protection improvement circuits, in particular to an adapter secondary side overvoltage protection improvement circuit. Background Art

[0002] An adapter is an interface converter, which can be an independent hardware interface device that allows a hardware or electronic interface to connect to other hardware or electronic interfaces, or an information interface. For example: a power adapter, a tripod base adapter, a USB to serial port adapter, etc.

[0003] The existing adapter outputs 12Vdc in normal working state. However, when a certain fault occurs, the output voltage reaches 15V, and some electronic components in the circuit will be damaged. In order to completely solve the problem of damage to electronic components, a protection circuit needs to be set in the adapter.

[0004] Therefore, the utility model provides an improved circuit for overvoltage protection on the secondary side of an adapter, which is used to solve the above-mentioned related technical problems. Utility Model Content

[0005] The utility model aims to provide an improved circuit for overvoltage protection on the secondary side of an adapter. The provided forward-type switching power supply cooling fan driving circuit has a simple circuit, is easy to implement, saves power supply cost, reduces power supply volume, and has a driving circuit with automatic speed adjustment and compensation function, so as to make up for some deficiencies and waste of resources in the existing high-power switching power supply cooling fan driving method.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An adapter secondary side overvoltage protection improvement circuit includes an optical coupler U1, a resistor R1, a resistor R2, a diode ZD1, a transistor Q1 and an output terminal Vout;

[0008] The optical coupler U1 is connected to the output terminal Vout via the resistor R2;

[0009] The diode ZD1 is connected to the base of the transistor Q1 , and the diode ZD1 is connected to the output terminal Vout.

[0010] Furthermore, the emitter of the transistor Q1 is connected to the diode ZD1 via the resistor R1.

[0011] Furthermore, the emitter of the transistor Q1 and the diode ZD1 are both grounded.

[0012] Furthermore, a resistor R3 is connected between the diode ZD1 and the optical coupler U1.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The improved overvoltage protection circuit on the secondary side of the adapter of the utility model can ensure that when the output end reaches a preset constant voltage value, the voltage signal on the secondary side is effectively fed back to the primary side. After the primary side controller receives the feedback signal from the secondary side, the overvoltage protection is triggered, which will ultimately protect the product and ensure that there is no impact on the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 The utility model discloses a circuit diagram of an improved circuit for overvoltage protection on the secondary side of an adapter. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0018] like Figure 1 As shown, an improved circuit for overvoltage protection on the secondary side of an adapter includes an optocoupler U1, a resistor R1, a resistor R2, a diode ZD1, a transistor Q1 and an output terminal Vout; the optocoupler U1 is connected to the output terminal Vout via the resistor R2; the diode ZD1 is connected to the base of the transistor Q1, and the diode ZD1 is connected to the output terminal Vout.

[0019] The diode ZD1 has a preset constant voltage value. When the output voltage is less than the constant voltage value, the transistor Q1 is not turned on and the receiving end of the optocoupler U1 is not turned on. When the output voltage is greater than the constant voltage value, the transistor Q1 is turned on and the receiving end of the optocoupler U1 is turned on. In one embodiment, the constant voltage value is 15V.

[0020] In addition, the emitter of the transistor Q1 is connected to the diode ZD1 via the resistor R1.

[0021] The emitter of transistor Q1 and diode ZD1 are both grounded to ensure the safety of the circuit.

[0022] A resistor R3 is connected between the diode ZD1 and the optocoupler U1.

[0023] In this embodiment, the provided adapter secondary side overvoltage protection improvement circuit is in operation. When the output voltage Vout<15V, the transistor Q1 is not turned on, and the receiving end of the optocoupler U1 is not turned on. When the output voltage Vout>15V, the transistor Q1 is turned on, and the receiving end of the optocoupler U1 is turned on.

[0024] The improved overvoltage protection circuit on the secondary side of the adapter of the utility model can ensure that when the output end reaches a preset constant voltage value, the voltage signal on the secondary side is effectively fed back to the primary side. After the primary side controller receives the feedback signal from the secondary side, the overvoltage protection is triggered, which will ultimately protect the product and ensure that there is no impact on the product.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0026] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An adapter secondary side overvoltage protection improvement circuit, characterized in that: It includes an optocoupler U1, a resistor R1, a resistor R2, a diode ZD1, a transistor Q1 and an output terminal Vout; The optical coupler U1 is connected to the output terminal Vout via the resistor R2; The diode ZD1 is connected to the base of the transistor Q1 , and the diode ZD1 is connected to the output terminal Vout.

2. The adapter secondary side overvoltage protection improvement circuit according to claim 1, characterized in that: The emitter of the transistor Q1 is connected to the diode ZD1 via the resistor R1.

3. The adapter secondary side overvoltage protection improvement circuit according to claim 1, characterized in that: The emitter of the transistor Q1 and the diode ZD1 are both grounded.

4. The adapter secondary side overvoltage protection improvement circuit according to claim 1, characterized in that: A resistor R3 is connected between the diode ZD1 and the optical coupler U1.

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