A control circuit for input power supply short circuit protection

Abstract

A control circuit for input power short-circuit protection includes an adapter power input terminal J1, a battery power input terminal J2, a first short-circuit protection circuit, a second short-circuit protection circuit, and a voltage regulator and filter circuit. The adapter power input terminal J1 is connected to the voltage regulator and filter circuit through the first short-circuit protection circuit, and the battery power input terminal J2 is connected to the voltage regulator and filter circuit through the second short-circuit protection circuit. The voltage regulator and filter circuit is connected to the control board power supply. This invention's input power short-circuit protection control circuit, while meeting the low-cost requirement, uses a simple circuit to solve the short-circuit protection problem of the power input circuit in a children's bed. This control circuit uses only a few inexpensive electronic components to solve the problem of injury caused by short circuits in the adapter power input or battery power input, thus meeting the safety requirements of children's beds for the power input circuit. Moreover, this control circuit can also be applied to other products with similar requirements.

Description

Technical Field

[0001] This utility model relates to the field of power supply circuit technology, and in particular to a control circuit for input power supply short circuit protection. Background Technology

[0002] Current power input control circuits for children's beds, such as Figure 3 As shown, the children's bed is connected to the external power adapter input terminal via terminal J1 and to the external battery input via terminal J2. The above solution can realize the power input function of the children's bed, but it does not have the short circuit protection function. Once a short circuit occurs in the terminal or other circuits, it will not block the power input of the children's bed, which may cause the battery to explode or other components to burn out, or even cause a fire.

[0003] Therefore, further improvements are necessary. Utility Model Content

[0004] The purpose of this utility model is to provide a control circuit for input power supply short circuit protection that is simple in structure, low in cost, safe and reliable, meets user requirements, and is highly practical, so as to overcome the shortcomings of the prior art.

[0005] A control circuit for input power short-circuit protection designed for this purpose is characterized by comprising an adapter power input terminal J1, a battery power input terminal J2, a first short-circuit protection circuit, a second short-circuit protection circuit, and a voltage regulator and filter circuit. The adapter power input terminal J1 is connected to the voltage regulator and filter circuit through the first short-circuit protection circuit, and the battery power input terminal J2 is connected to the voltage regulator and filter circuit through the second short-circuit protection circuit. The voltage regulator and filter circuit is connected to the control board power supply.

[0006] The first short-circuit protection circuit includes a fuse F1. One end of the fuse F1 is connected to pin 3 of the power input terminal J1 of the adapter, and the other end of the fuse F1 is connected to the positive terminal of the DC5V power supply and the voltage regulator and filter circuit.

[0007] The second short-circuit protection circuit includes a fuse PTC1 and a diode D1. Pin 1 of the battery power input terminal J2 is connected to one end of the fuse PTC1, and the other end of the fuse PTC1 is connected to the positive terminal of the diode D1. The negative terminal of the diode D1 is connected to the positive terminal of the DC5V power supply and the voltage regulator and filter circuit.

[0008] The voltage regulator and filter circuit includes a Zener diode ZD1 and a capacitor C1. The other end of the fuse F1 is connected to the negative terminal of the Zener diode ZD1 and one end of the capacitor C1, respectively. The positive terminal of the Zener diode ZD1 and the other end of the capacitor C1 are connected to the negative terminal of the DC5V power supply, respectively. The negative terminal of the diode D1 is connected to one end of the capacitor C1.

[0009] Pin 1 of the adapter power input terminal J1 is connected to pin 2 of the battery power input terminal J2.

[0010] Pin 2 of the adapter's power input terminal J1 is connected to the negative terminal of the DC 5V power supply.

[0011] The adapter power input terminal J1 is connected to the adapter power supply, and the battery power input terminal J2 is connected to the battery power supply.

[0012] The adapter is powered by a power outlet.

[0013] Fuse F1 is a fusible fuse.

[0014] Fuse PTC1 is a self-resetting fuse.

[0015] This utility model's input power short-circuit protection control circuit, while meeting the prerequisite of low cost, uses a simple circuit to solve the problem of short-circuit protection for the input power of a children's bed. This control circuit uses only a few inexpensive electronic components to solve the problem of injury caused by short circuits in the adapter input power or battery input power, thereby meeting the safety requirements of the power input circuit of a children's bed. Moreover, this control circuit can also be applied to other products with similar requirements. Attached Figure Description

[0016] Figure 1 This is a circuit diagram of the control circuit in one embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the control circuit in one embodiment of the present invention.

[0018] Figure 3 This is a circuit diagram of a traditional control circuit. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] See Figures 1-2This short-circuit protection control circuit for the input power supply includes an adapter power input terminal J1, a battery power input terminal J2, a first short-circuit protection circuit 1, a second short-circuit protection circuit 2, and a voltage regulator and filter circuit 3. The adapter power input terminal J1 is connected to the voltage regulator and filter circuit 3 through the first short-circuit protection circuit 1, and the battery power input terminal J2 is connected to the voltage regulator and filter circuit 3 through the second short-circuit protection circuit 2. The voltage regulator and filter circuit 3 is connected to the control board power supply 4. This control circuit is used for the input power supply of the children's bed. Based on the needs of the children's bed, this control circuit with added short-circuit protection function was designed. This implemented circuit can meet customer requirements while also being simple, reliable, and inexpensive. The entire circuit system consists of the adapter power input terminal J1, the battery power input terminal J2, the first short-circuit protection circuit 1, the second short-circuit protection circuit 2, and the voltage regulator and filter circuit 3. The adapter and battery input power supplies are respectively supplied to the children's bed control board DC5V power supply after passing through fuse F1 and fuse PTC1, and then through voltage regulator and filter components.

[0021] The first short-circuit protection circuit 1 includes a fuse F1. One end of the fuse F1 is connected to pin 3 of the power input terminal J1 of the adapter. The other end of the fuse F1 is connected to the positive terminal of the DC5V power supply and the voltage regulator and filter circuit 3. The DC5V power supply is the power supply of the control board 4.

[0022] The second short-circuit protection circuit 2 includes a fuse PTC1 and a diode D1. Pin 1 of the battery power input terminal J2 is connected to one end of the fuse PTC1, and the other end of the fuse PTC1 is connected to the positive terminal of the diode D1. The negative terminal of the diode D1 is connected to the positive terminal of the DC5V power supply and the voltage regulator and filter circuit 3.

[0023] The voltage regulator filter circuit 3 includes a Zener diode ZD1 and a capacitor C1. The other end of the fuse F1 is connected to the negative terminal of the Zener diode ZD1 and one end of the capacitor C1, respectively. The positive terminal of the Zener diode ZD1 and the other end of the capacitor C1 are connected to the negative terminal of the DC5V power supply, respectively. The negative terminal of the diode D1 is connected to one end of the capacitor C1.

[0024] Pin 1 of the adapter power input terminal J1 is connected to pin 2 of the battery power input terminal J2.

[0025] Pin 2 of the adapter's power input terminal J1 is connected to the negative terminal of the DC 5V power supply.

[0026] The adapter power input terminal J1 is connected to the adapter power supply, and the battery power input terminal J2 is connected to the battery power supply. The power adapter is input through the adapter power input terminal J1, passes through the fuse F1, and is input to the control board. The battery power is input through the battery power input terminal J2, passes through the fuse PTC1, and is input to the control board through the diode D1. The Zener diode ZD1 provides overvoltage protection, and the capacitor C1 provides filtering to increase the system's anti-interference performance.

[0027] The adapter power supply is a DC005 type socket. When no adapter power is connected, pins 1 and 2 of the adapter power terminal J1 are short-circuited, and the children's bed is powered by the battery. When the adapter power is connected, pins 1 and 2 of the adapter power terminal J1 are disconnected, and the children's bed is powered by the adapter power.

[0028] Fuse F1 is a fusible fuse that will blow when the current passing through it exceeds the allowable current, thus disconnecting the power input to the adapter.

[0029] The PTC1 fuse is a resettable fuse, which automatically disconnects the circuit in case of overcurrent or short circuit. After the circuit fault is cleared, it automatically returns to the conducting state. At room temperature, its resistance is relatively small, which can ensure the normal operation of subsequent circuits. However, when the current flowing through it increases and exceeds the rated current, causing the temperature to rise, its resistance will increase rapidly to the megaohm level. At this time, the current flowing through it is very small, close to the open circuit state, thus protecting the downstream circuits.

[0030] When the children's bed is powered by the adapter, if the control board experiences a short circuit or other fault that causes the current to rise, the fuse F1 will trip when the current exceeds the allowable current of the fuse F1, thereby disconnecting the power supply from the adapter and preventing damage to the downstream circuitry due to excessive current.

[0031] When the children's bed is powered by battery, if a short circuit or other fault occurs on the control board, causing the current to rise, when the current exceeds the allowable current of the resettable fuse PTC1, the resistance of the resettable fuse PTC1 will increase rapidly, resulting in a very small current flowing through it, making the battery power input close to an open circuit state, and preventing the protection of the downstream circuit from being damaged due to excessive current.

[0032] By utilizing the characteristics of fuses and resettable fuses, overload and short-circuit protection can be achieved for the control circuit of the children's bed, while preventing fires and other potential disasters, greatly improving the safety performance of the children's bed. Similarly, this circuit can also be used for other power control circuits with the same requirements.

[0033] This control circuit is simple, reliable, and inexpensive. Different voltages and currents can be achieved by adjusting the hardware according to customer needs. At the same time, this control circuit can make full use of existing mature components, which improves the reliability of the system and the convenience of production.

[0034] The above describes the preferred embodiments of this utility model, illustrating and describing its basic principles, main features, and advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made without departing from the spirit and scope of this utility model, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A control circuit for input power short circuit protection, characterized by: It includes an adapter power input terminal J1, a battery power input terminal J2, a first short circuit protection circuit (1), a second short circuit protection circuit (2), and a voltage regulator and filter circuit (3). The adapter power input terminal J1 is connected to the voltage regulator and filter circuit (3) through the first short circuit protection circuit (1), and the battery power input terminal J2 is connected to the voltage regulator and filter circuit (3) through the second short circuit protection circuit (2). The voltage regulator and filter circuit (3) is connected to the control board power supply (4).

2. The control circuit for input power short protection according to claim 1, characterized in that: The first short-circuit protection circuit (1) includes a fuse F1. One end of the fuse F1 is connected to pin 3 of the power input terminal J1 of the adapter. The other end of the fuse F1 is connected to the positive terminal of the DC5V power supply and the voltage regulation and filtering circuit (3).

3. The control circuit for input power short protection according to claim 2, characterized in that: The second short-circuit protection circuit (2) includes a fuse PTC1 and a diode D1. One end of the battery power input terminal J2 is connected to one end of the fuse PTC1, and the other end of the fuse PTC1 is connected to the positive terminal of the diode D1. The negative terminal of the diode D1 is connected to the positive terminal of the DC5V power supply and the voltage regulation and filtering circuit (3).

4. The control circuit for input power short protection according to claim 3, characterized in that: The voltage regulator filter circuit (3) includes a Zener diode ZD1 and a capacitor C1. The other end of the fuse F1 is connected to the negative terminal of the Zener diode ZD1 and one end of the capacitor C1, respectively. The positive terminal of the Zener diode ZD1 and the other end of the capacitor C1 are connected to the negative terminal of the DC5V power supply, respectively. The negative terminal of the diode D1 is connected to one end of the capacitor C1.

5. The control circuit for input power supply short protection according to claim 4, characterized in that: Pin 1 of the adapter power input terminal J1 is connected to pin 2 of the battery power input terminal J2.

6. The control circuit for input power supply short-circuit protection according to claim 4, characterized in that: Pin 2 of the adapter's power input terminal J1 is connected to the negative terminal of the DC 5V power supply.

7. The control circuit for input power short protection according to claim 1, characterized in that: The adapter power input terminal J1 is connected to the adapter power supply, and the battery power input terminal J2 is connected to the battery power supply.

8. The control circuit for input power supply short protection according to claim 7, characterized in that: The adapter is powered by a power outlet.

9. The control circuit for input power short protection according to claim 2, characterized in that: Fuse F1 is a fusible fuse.

10. The control circuit for input power short protection according to claim 3, characterized in that: Fuse PTC1 is a self-resetting fuse.

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