Power supply protection circuit, host equipment and separated sound system

Abstract

The utility model relates to a power supply protection circuit, host equipment and a separated sound system. The power supply protection circuit comprises a connection pin, a switch circuit and a short circuit detection circuit. The first end of the switching circuit is connected with the power supply, the second end of the switching circuit is connected with the connecting pin, the first end of the short circuit detection circuit is connected with the connecting pin, and the second end of the short circuit detection circuit is connected with the third end of the switching circuit; the short-circuit detection circuit collects a working voltage signal of the connecting pin, generates a short-circuit protection signal when the working voltage signal is at a low level, and transmits the short-circuit protection signal to the switching circuit; and when the switching circuit receives the short-circuit protection signal, a loop for supplying power to the connecting pins by the power supply is disconnected. By detecting the short circuit condition of the connecting pins, circuit damage caused by connection of a power supply during short circuit is avoided, and the product protection effect is further achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of equipment protection, especially relates to a power protection circuit, host equipment and split type sound system. BACKGROUND

[0002] Since the surround sound can be inserted on the host for use and charging, its connection generally uses spring needle (POGOPIN) design, and the POGO PIN is generally exposed, for safety consideration, the power supply pin of the POGO PIN is not opened in the unconnected state.But in some special conditions, the POGO PIN interface detection pin short circuit condition may occur, the POGO PIN power supply pin is short-circuited to the ground, and when the power supply is opened, the power supply to the ground short circuit condition is caused to cause circuit damage.

[0003] The above content is only used to assist understanding the technical scheme of the utility model, and does not represent that the above content is prior art. UTILITY MODEL CONTENT

[0004] The main purpose of the utility model is to provide a kind of power protection circuit, host equipment and split type sound system, to solve the technical problem that pin of connection in prior art is prone to power supply to ground short circuit and cause hardware damage.

[0005] To achieve the above purpose, first, the utility model technical scheme proposes a kind of power protection circuit, the power protection circuit includes: connecting pin, switching circuit and short circuit detection circuit;The first end of the switching circuit is connected with power supply, the second end of the switching circuit is connected with the connecting pin, the first end of the short circuit detection circuit is connected with the connecting pin, the second end of the short circuit detection circuit is connected with the third end of the switching circuit;The short circuit detection circuit is used to collect the working voltage signal of the connecting pin, when the working voltage signal is low level, generates short circuit protection signal, and the short circuit protection signal is transmitted to the switching circuit;The switching circuit is used to disconnect the loop that the power supply supplies the connecting pin with power when receiving the short circuit protection signal.By detecting the short circuit condition of connecting pin, avoid the circuit damage caused by short circuit when power supply is connected, and then realize the protection effect to product.

[0006] Second, the utility model technical scheme also proposes a kind of host equipment, the host equipment includes system power supply and the power protection circuit as described above;One end of the power protection circuit is connected with the system power supply, and the other end of the power protection circuit is connected with external equipment through communication connection line;The system power supply supplies the connected external equipment with power through the connecting pin of the power protection circuit.

[0007] The utility model discloses technical schemes still propose a separated sound system, the separated sound system includes sound and the host computer equipment as described above. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, below will to the drawing needed to be used in the embodiment or prior art description simple introduction, obviously, below description's drawing only some embodiments of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying creative labor, can also obtain other drawings according to the structure shown in these drawings.

[0009] Figure 1 It is the structural schematic diagram of the first embodiment of the utility model power protection circuit;

[0010] Figure 2 It is the circuit connection drawing of the second embodiment of the utility model power protection circuit;

[0011] Figure 3 It is the circuit connection drawing of the third embodiment of the utility model power protection circuit;

[0012] Figure 4 It is the structural schematic diagram of the first embodiment of the utility model host computer equipment;

[0013] Figure 5 It is the structural schematic diagram of the first embodiment of the utility model separated sound system.

[0014] The utility model purposes realization, functional characteristics and advantages will be further described with reference to the drawings in conjunction with the embodiment. DETAILED DESCRIPTION

[0015] It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0016] The technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, obviously, the described embodiments only are a part of the embodiments of the utility model, and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled person in the art without making creative labor belong to the range of the utility model protection.

[0017] It should be noted that all directionality indications (such as up, down, left, right, front, back...) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), if the specific posture changes, then the directionality indication also changes accordingly.

[0018] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0019] Reference Figure 1 , Figure 1 This is a schematic diagram of the first embodiment of the power protection circuit of this utility model. This utility model proposes a first embodiment of the power protection circuit.

[0020] In this embodiment, the power protection circuit includes: a connection pin 10, a switching circuit 20, and a short-circuit detection circuit 30. The first terminal of the switching circuit 20 is connected to the power supply VCC, the second terminal of the switching circuit 20 is connected to the connection pin 10, the first terminal of the short-circuit detection circuit 30 is connected to the connection pin 10, and the second terminal of the short-circuit detection circuit 30 is connected to the third terminal of the switching circuit 20.

[0021] It should be noted that the short-circuit detection circuit 30 can be used to acquire the operating voltage signal of the connection pin 10. When the operating voltage signal is low, a short-circuit protection signal is generated and transmitted to the switching circuit 20. The switching circuit 20 can be used to disconnect the power supply circuit VCC that supplies power to the connection pin 10 when the short-circuit protection signal is received.

[0022] It should be understood that connector pin 10 can be a connector used for signal transmission between electronic products, such as a POGO pin, which consists of three basic components: a pin shaft, a spring, and a pin tube. These components are formed by precision instrument riveting and pre-compression to create a spring-loaded probe. When two connection points need to be energized or connected, a certain force is applied to make the POGO pin tip contact the corresponding contact point, thus ensuring the normal flow of current. In audio products, surround sound speakers can be plugged into the main unit or placed separately to create a multi-channel sound field effect. However, POGO pins are generally exposed and prone to short circuits.

[0023] It should be noted that the short-circuit detection circuit 30 can be an electronic device or a combination of electronic devices with short-circuit detection capability. Connecting it to the connection pin 10 collects the operating voltage signal on the connection pin 10, thereby determining whether a short-circuit fault has occurred at the connection pin 10 based on the operating voltage signal. Specifically, based on the amplitude of the operating voltage signal, under normal operation, the amplitude of the operating voltage signal at the connection pin 10 can be the voltage value provided by the power supply VCC, while in the event of a short circuit to ground, the amplitude of the operating voltage signal at the connection pin 10 is "0" (or low level). When the amplitude of the collected operating voltage signal is low, a short-circuit protection signal is generated and transmitted to the switching circuit 20. The short-circuit protection signal can be a clamping electrical signal with a certain voltage amplitude.

[0024] The switching circuit 20 can be an electronic device or combination of electronic devices capable of both turning on and off, such as a transistor, field-effect transistor, or solenoid valve. It can adjust the on / off state between its input and output ports according to an externally input control signal. For example, the short-circuit protection signal generated by the short-circuit detection circuit 30 can be a low-level electrical signal. When the switching circuit 20 receives a low-level short-circuit protection signal, it controls the power supply VCC to cut off the power supply circuit to the connecting pin 10. Since the connecting pin 10 cannot be energized, hardware damage will not occur due to a short-circuit fault.

[0025] This embodiment proposes a power protection circuit, which includes: a connection pin, a switching circuit, and a short-circuit detection circuit. The first terminal of the switching circuit is connected to a power supply, the second terminal of the switching circuit is connected to the connection pin, the first terminal of the short-circuit detection circuit is connected to the connection pin, and the second terminal of the short-circuit detection circuit is connected to the third terminal of the switching circuit. The short-circuit detection circuit collects the operating voltage signal of the connection pin. When the operating voltage signal is low, it generates a short-circuit protection signal and transmits the short-circuit protection signal to the switching circuit. The switching circuit, upon receiving the short-circuit protection signal, disconnects the power supply circuit supplying power to the connection pin. By detecting the short-circuit condition of the connection pin, circuit damage caused by connecting the power supply during a short circuit is avoided, thereby achieving product protection.

[0026] Reference Figure 2 , Figure 2 This is a circuit connection diagram of the second embodiment of the power protection circuit of this utility model. Based on the first embodiment of the power protection circuit described above, a second embodiment of the power protection circuit of this utility model is proposed. In the second embodiment, the same or similar content as the above embodiment can be referred to the above description, and will not be repeated hereafter.

[0027] The power protection circuit further includes: an unloaded start circuit 40; the first terminal of the unloaded start circuit 40 is connected to the power supply VCC, and the second terminal of the unloaded start circuit 40 is connected to the first terminal of the short circuit detection circuit 30.

[0028] It should be noted that the no-load start circuit 40 can transmit a high-level signal to the short-circuit detection circuit 30 when the connection pin 10 is in a no-load state. The short-circuit detection circuit 30 can also refrain from generating the short-circuit protection signal when it receives the high-level signal.

[0029] It should be understood that the reason why the operating voltage signal collected by the short-circuit detection circuit 30 is low-level may be due to a short-circuit fault at the connection pin 10, or it may be that the connection pin 10 is in an unloaded state, with no external device connected, or the external device has not requested charging. If the short-circuit condition is used as the cause, the generated short-circuit protection signal may be clamped, preventing the switching circuit 20 from connecting the power supply VCC to the power supply circuit at the connection pin 10 after the external device is connected, thus affecting the normal operation of the device. Therefore, it is necessary to control the short-circuit detection circuit 30 to prevent it from generating a short-circuit protection signal in an unloaded state.

[0030] In one possible implementation, the short-circuit detection circuit 30 may include a Schottky diode D1. The cathode of the Schottky diode D1 is connected to the connection pin 10 and the second terminal of the no-load start-up circuit 40, and the anode of the Schottky diode D1 is connected to the third terminal of the switching circuit 20.

[0031] Furthermore, the no-load start circuit 40 may include: a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is connected to the power supply VCC, the second end of the first resistor R1 is connected to the cathode of the Schottky diode D1 and the first end of the second resistor R2, and the second end of the second resistor R2 is grounded.

[0032] It should be noted that the Schottky diode D1 is a semiconductor device made using the principle of a metal-semiconductor junction formed by the contact between a metal and a semiconductor. Under forward bias, the potential barrier decreases, allowing current to flow; under reverse bias, the potential barrier increases, preventing current from flowing. Therefore, when a short circuit occurs at the connection pin, the voltage value of the generated short-circuit protection signal is equal to the device voltage drop of the Schottky diode D1, for example, it can be set to 0.3V. Upon receiving the 0.3V short-circuit protection signal, the switching circuit disconnects the power supply circuit that supplies power to the connection pin.

[0033] It should be understood that when pin 10 is not short-circuited and is under no-load conditions, the cathode voltage of Schottky diode D1 is the voltage division value of the power supply VCC across the second resistor R2, which is a high-level voltage. Therefore, a low-level short-circuit protection signal clamping condition will not be generated, preventing the switching circuit 20 from conducting.

[0034] In this embodiment, the power protection circuit further includes an unloaded start-up circuit. The first terminal of the unloaded start-up circuit is connected to the power supply, and the second terminal is connected to the first terminal of the short-circuit detection circuit. The unloaded start-up circuit transmits a high-level signal to the short-circuit detection circuit when the connection pin is in an unloaded state; the short-circuit detection circuit also prevents the generation of the short-circuit protection signal upon receiving the high-level signal. The short-circuit detection circuit includes a Schottky diode; the cathode of the Schottky diode is connected to the connection pin and the second terminal of the unloaded start-up circuit, and the anode of the Schottky diode is connected to the third terminal of the switching circuit. By using a Schottky diode with a fixed voltage drop, a low-level short-circuit protection signal can be quickly generated when a short circuit occurs, driving the switching circuit to disconnect the power supply circuit that powers the connection pin, thus preventing circuit damage caused by the power supply connection during a short circuit.

[0035] Reference Figure 3 , Figure 3 This is a circuit connection diagram of the third embodiment of the power protection circuit of this utility model. Based on the above embodiments of the power protection circuit, a third embodiment of the power protection circuit of this utility model is proposed.

[0036] The switching circuit 20 includes an enable control unit 201 and a switch connection unit 202. The first terminal of the enable control unit 201 is connected to the second terminal of the short-circuit detection circuit 30 and an enable input signal. The second terminal of the enable control unit 201 is connected to the first terminal of the switch connection unit 202. The second terminal of the switch connection unit 202 is connected to the power supply VCC and the second terminal of the switch connection unit 202 is connected to the connection pin 10.

[0037] It should be noted that the short-circuit detection circuit 30 can also transmit the short-circuit protection signal to the enable control unit 201. The enable control unit 201 can generate a power supply enable signal when it receives the enable input signal but does not receive the short-circuit protection signal, and transmit the power supply enable signal to the switch connection unit 202. The switch connection unit 202 can, upon receiving the power supply enable signal, connect the power supply VCC to power the connection pin 10.

[0038] It should be understood that the enable control unit 201 can be an electronic device that controls the power supply protection circuit to normally drive the power supply VCC to supply power to the connection pin 10. When no short-circuit fault occurs at the connection pin 10, the enable control unit 201 can generate a power supply enable signal when an enable control signal is received. The enable control signal can be an electrical signal generated when an external device is connected to the connection pin 10; for example, it can be a high level when an external device is connected and a low level when no external device is connected.

[0039] In one possible implementation, the switch connection circuit includes: a first capacitor C1, a first switching transistor Q1, a third resistor R3, and a fourth resistor R4. The first terminal of the third resistor R3 is connected to the power supply VCC and the first terminal of the first capacitor C1. The second terminal of the third resistor R3 is connected to the second terminal of the first capacitor C1, the first terminal of the fourth resistor R4, and the control terminal of the first switching transistor Q1. The input terminal of the first switching transistor Q1 is connected to the power supply VCC, and the output terminal of the first switching transistor Q1 is connected to the connection pin 10. The second terminal of the fourth resistor R4 is connected to the second terminal of the enable control unit 201.

[0040] Furthermore, the enable control unit 201 includes a fifth resistor R5, a sixth resistor R6, and a second switch Q2. The first terminal of the fifth resistor R5 is connected to the enable input signal V. EN The second end of the fifth resistor R5 is connected to the control terminal of the second switch Q2, the first end of the sixth resistor R6, and the second end of the short-circuit detection circuit 30. The input terminal of the second switch Q2 is connected to the second end of the fourth resistor R4. The output terminal of the second switch Q2 is connected to the second end of the sixth resistor R6 and grounded.

[0041] It should be noted that when an external device is connected and the enable control signal is high, and there is no short circuit at pin 10, the voltage difference across the second switch Q2 exceeds the conduction threshold, causing Q2 to conduct. The voltage difference across the first switch Q1 is also due to the voltage drop across the third resistor R3 exceeding the conduction threshold, causing Q1 to conduct as well. Therefore, the power supply VCC can supply power to pin 10. When no external device is connected and the enable control signal is low, and there is no short circuit at pin 10, the voltage difference across the second switch Q2 does not reach the conduction threshold, causing Q2 to turn off. There is no voltage drop across the first switch Q1, causing Q1 to turn off as well. Therefore, the power supply VCC will not supply power to pin 10. When a short circuit occurs at pin 10, the voltage across the second switch Q2 is clamped to a low level, causing both Q2 and Q1 to turn off. Therefore, the power supply VCC will not supply power to pin 10.

[0042] It should be understood that the first switch Q1 and the second switch Q2 can be NMOS transistors, NPN transistors, or switching transistor chips, etc. This embodiment uses a field-effect transistor (FET) as the first switch Q1 and a bipolar junction transistor (BJT) as the second switch Q2 for illustration. When the voltage difference between the gate and source of the FET exceeds the conduction threshold, the source and drain are turned on. When the voltage difference between the base and emitter of the BJT exceeds the conduction threshold, the collector and emitter are turned on.

[0043] In this embodiment, the switching circuit includes: an enable control unit and a switch connection unit; a first terminal of the enable control unit is connected to a second terminal of the short-circuit detection circuit and an enable input signal; a second terminal of the enable control unit is connected to a first terminal of the switch connection unit; a second terminal of the switch connection unit is connected to the power supply; and a second terminal of the switch connection unit is connected to the connection pin; the short-circuit detection circuit is further configured to transmit the short-circuit protection signal to the enable control unit; the enable control unit is configured to generate a power supply enable signal and transmit the power supply enable signal to the switch connection unit when it receives the enable input signal but does not receive the short-circuit protection signal; and the switch connection unit is configured to, when it receives the power supply enable signal, connect the circuit through which the power supply provides power to the connection pin. This avoids the need for complex current limiting and protection circuits, saving on equipment development costs.

[0044] Furthermore, this embodiment of the invention also proposes a host device. (Refer to...) Figure 4 , Figure 4 This is a schematic diagram of the structure of an embodiment of the host device of this utility model.

[0045] The host device includes a system power supply Vs and a power protection circuit 50 as described above. One end of the power protection circuit 50 is connected to the system power supply Vs, and the other end of the power protection circuit 50 is connected to an external device via a communication connection line; the system power supply Vs supplies power to the connected external device through the connection pin 10 of the power protection circuit 50.

[0046] Since the host device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0047] It should be noted that the system power supply Vs in the host device can be used to replace the power supply VCC in the above embodiments.

[0048] Furthermore, the host device also includes: a microcontroller (MCU); the connection pins 10 of the power protection circuit include: communication pins (refer to...). Figure 4 (TX1 pin and RX1 pin) and detection pins (refer to) Figure 4 The DET1 pin (in the middle) and the connection pins may also include: power supply pins (refer to...) Figure 4 PVDD4 pin) and ground pin (refer to) Figure 4 (GND3 pin). The first terminal of the microcontroller is connected to the detection pin, and the second terminal of the microcontroller is connected to the communication pin. The microcontroller (MCU) can also be connected to the enable control unit in the power protection circuit.

[0049] It should be noted that during normal operation of the host device, when an external device receives a low-level signal on the DET1 pin, it generates a high-level enable control signal and transmits it to the enable control unit, thereby driving the system power supply Vs to power the PVDD4 pin. When a short circuit occurs on the DET1 pin, the DET1 pin is also in a low-level state. However, at this time, if the communication between the external device and the host device via pin 10 fails, the TX1 and RX1 pins will also be low-level signals. When the microcontroller detects the low-level signals on the TX1 and RX1 pins, it will generate a low-level enable control signal and transmit it to the enable control unit, thereby stopping the system power supply Vs from powering the PVDD4 pin, thus achieving timely protection of the hardware device.

[0050] Furthermore, this embodiment of the invention also proposes a separate audio system. (Refer to...) Figure 5 , Figure 5 This is a schematic diagram of an embodiment of the split-type audio system of this utility model. The split-type audio system includes an audio system and a main unit as described above.

[0051] Since the split audio system adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0052] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A power supply protection circuit, characterized in that, The power protection circuit includes: connection pins, a switching circuit, and a short-circuit detection circuit; The first terminal of the switching circuit is connected to the power supply, the second terminal of the switching circuit is connected to the connection pin, the first terminal of the short circuit detection circuit is connected to the connection pin, and the second terminal of the short circuit detection circuit is connected to the third terminal of the switching circuit. The short-circuit detection circuit is used to collect the working voltage signal of the connection pin, generate a short-circuit protection signal when the working voltage signal is low, and transmit the short-circuit protection signal to the switching circuit. The switching circuit is used to disconnect the power supply circuit that supplies power to the connection pin when the short-circuit protection signal is received.

2. The power protection circuit as described in claim 1, characterized in that, The power protection circuit also includes: an unloaded start-up circuit; The first terminal of the no-load start circuit is connected to the power supply, and the second terminal of the no-load start circuit is connected to the first terminal of the short-circuit detection circuit. The no-load start circuit is used to transmit a high-level signal to the short-circuit detection circuit when the connection pin is in a no-load state. The short-circuit detection circuit is also configured not to generate the short-circuit protection signal when the high-level signal is received.

3. The power protection circuit as described in claim 2, characterized in that, The short-circuit detection circuit includes: a Schottky diode; The cathode of the Schottky diode is connected to the connecting pin and the second terminal of the no-load start-up circuit, and the anode of the Schottky diode is connected to the third terminal of the switching circuit.

4. The power protection circuit as described in claim 3, characterized in that, The no-load start circuit includes: a first resistor and a second resistor; The first end of the first resistor is connected to the power supply, the second end of the first resistor is connected to the cathode of the Schottky diode and the first end of the second resistor, and the second end of the second resistor is grounded.

5. The power protection circuit as described in claim 1, characterized in that, The switching circuit includes: an enable control unit and a switch connection unit; The first terminal of the enable control unit is connected to the second terminal of the short-circuit detection circuit and the enable input signal. The second terminal of the enable control unit is connected to the first terminal of the switch connection unit. The second terminal of the switch connection unit is connected to the power supply. The second terminal of the switch connection unit is connected to the connection pin. The short-circuit detection circuit is also used to transmit the short-circuit protection signal to the enable control unit; The enable control unit is configured to generate a power supply enable signal when it receives the enable input signal and does not receive the short circuit protection signal, and transmit the power supply enable signal to the switch connection unit. The switch connection unit is used to turn on the circuit of the power supply to supply power to the connection pin when the power supply enable signal is received.

6. The power protection circuit as described in claim 5, characterized in that, The switch connection circuit includes: a first capacitor, a first switching transistor, a third resistor, and a fourth resistor; The first end of the third resistor is connected to the power supply and the first end of the first capacitor. The second end of the third resistor is connected to the second end of the first capacitor, the first end of the fourth resistor, and the control end of the first switching transistor. The input end of the first switching transistor is connected to the power supply. The output end of the first switching transistor is connected to the connection pin. The second end of the fourth resistor is connected to the second end of the enable control unit.

7. The power protection circuit as described in claim 6, characterized in that, The enabling control unit includes: a fifth resistor, a sixth resistor, and a second switching transistor; The first end of the fifth resistor is connected to the enable input signal, the second end of the fifth resistor is connected to the control terminal of the second switch, the first end of the sixth resistor and the second end of the short circuit detection circuit, the input terminal of the second switch is connected to the second end of the fourth resistor, and the output terminal of the second switch is connected to the second end of the sixth resistor and grounded.

8. A host device, characterized in that, The host device includes: a system power supply and a power protection circuit as described in any one of claims 1-7; One end of the power protection circuit is connected to the system power supply, and the other end of the power protection circuit is connected to an external device via a communication connection line; The system power supply provides power to the connected external devices through the connection pins of the power protection circuit.

9. The host device as described in claim 8, characterized in that, The host device also includes: a microcontroller; The connection pins of the power protection circuit include: communication pins and detection pins; The first end of the microcontroller is connected to the detection pin, and the second end of the microcontroller is connected to the communication pin.

10. A split-type audio system, characterized in that, The split audio system includes: an audio system and a main unit as described in any one of claims 8-9.

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