Indicator lamp driving circuit

Abstract

The utility model relates to an indicating lamp driving circuit. The indicating lamp driving circuit comprises a first indicating lamp, a second indicating lamp, a control unit, a first power supply, a second power supply, a first switching device and a second switching device, the control signal output end of the control unit is connected with the control ends of the first switching device and the second switching device. The first power supply is connected with the anode of the first indicating lamp. The second power supply is connected with the anode of the second indicating lamp. The cathode of the first indicating lamp is connected with the anode of the second indicating lamp. The cathode of the second indicating lamp is connected with the anode of the first indicating lamp. The first power supply and the second power supply have the same potential; the first switching device and the second switching device are used for controlling the second indicating lamp to be lightened according to a first control signal output to the first switching device by the control unit; and according to a second control signal output by the control unit to the second switching device, the first indicating lamp is controlled to be lightened, so that the loss of the switching devices and the resistor is lower, the circuit is simplified, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to an indicator driving circuit. Background Art

[0002] On the server panel, there are health indicators or power status indicators. Usually, two lights of different colors form a group of indicators, and the health status or power status of the server system is indicated according to the color of the lit lights.

[0003] In the prior art, either the control unit of the indicator is connected to the pull-up power supply. When the indicator does not need to be lit, the control unit needs to continuously output a high-level signal, or an additional lighting power supply needs to be provided for the indicator on the panel.

[0004] However, in the above methods, the former will cause continuous power consumption of the switching device and the resistor when the light does not need to be on, and the latter needs to install a power protection chip for the additional lighting power supply. Both methods are prone to safety hazards and have a relatively high economic cost. Summary of the Utility Model

[0005] The utility model provides an indicator driving circuit to solve the problems of continuous power consumption and the need to provide an additional lighting power supply or even a power protection chip in the prior art.

[0006] The utility model provides an indicator driving circuit, which includes: a first indicator, a second indicator, a control unit, a first power supply, a second power supply, a first switching device, and a second switching device;

[0007] The control signal output terminals of the control unit are respectively connected to the control terminals of the first switching device and the second switching device;

[0008] The first power supply is connected to the anode of the first indicator, and the second power supply is connected to the anode of the second indicator; the cathode of the first indicator is connected to the anode of the second indicator, and the cathode of the second indicator is connected to the anode of the first indicator;

[0009] The first power supply and the second power supply are at the same potential;

[0010] The first switching device and the second switching device are used to control the lighting of the second indicator according to the first control signal output by the control unit to the first switching device; and are used to control the lighting of the first indicator according to the second control signal output by the control unit to the second switching device.

[0011] In one example, the control signal output terminals of the control unit include a first signal output terminal and a second signal output terminal;

[0012] The first signal output terminal is connected to the control terminal of the first switching device;

[0013] The second signal output terminal is connected to the control terminal of the second switching device.

[0014] In one example, the indicator light driving circuit includes: a first grounding resistor and a second grounding resistor;

[0015] The first grounding resistor is located at the intermediate node of the indicator light driving circuit where the first signal output terminal of the control unit is connected to the control terminal of the first switching device, and the first grounding resistor is grounded;

[0016] The second grounding resistor is located at the intermediate node of the indicator light driving circuit where the second signal output terminal of the control unit is connected to the control terminal of the second switching device, and the second grounding resistor is grounded.

[0017] In one example, the indicator light driving circuit further includes: a first pull-up resistor and a second pull-up resistor;

[0018] The first pull-up resistor is connected to the first power supply and is located at the intermediate node of the indicator light driving circuit where the output terminal of the first switching device is connected to the first indicator light. The first pull-up resistor and the first power supply form the first pull-up power supply;

[0019] The second pull-up resistor is connected to the second power supply and is located at the intermediate node of the indicator light driving circuit where the output terminal of the second switching device is connected to the second indicator light. The second pull-up resistor and the second power supply form the second pull-up power supply.

[0020] In one example, the indicator light driving circuit includes:

[0021] The grounding terminal of the first switching device is grounded;

[0022] The grounding terminal of the second switching device is grounded.

[0023] In one example, the first switching device and the second switching device are configured to control the second indicator light to turn on according to the first control signal output by the control unit to the first switching device, including:

[0024] The control unit outputs the first control signal through the first signal output terminal according to a first condition that satisfies the second indicator light turning on; under the action of the first control signal, the grounding terminal and the output terminal of the first switching device are conducted; the anode of the first indicator light is at a low potential; the cathode of the second indicator light is at a low potential;

[0025] No signal is output from the second signal output terminal of the control unit, and the ground terminal and the output terminal of the second switching device remain disconnected; the cathode of the first indicator light is at a high potential; the anode of the second indicator light is at a high potential;

[0026] The first indicator light goes out, and the second indicator light lights up.

[0027] In one example, the and for controlling the first indicator light to light up according to the second control signal output by the control unit to the second switching device includes:

[0028] The control unit outputs the second control signal through the second signal output terminal according to the second condition that satisfies the lighting of the first indicator light; under the action of the second control signal, the ground terminal and the output terminal of the second switching device are conducted; the anode of the second indicator light is at a low potential; the cathode of the first indicator light is at a low potential;

[0029] No signal is output from the first signal output terminal of the control unit, and the ground terminal and the output terminal of the first switching device remain disconnected; the cathode of the second indicator light is at a high potential; the anode of the first indicator light is at a high potential;

[0030] The first indicator light lights up, and the second indicator light goes out.

[0031] In one example, the switching device is a MOS transistor.

[0032] In one example, the first power supply and the second power supply output a positive power supply signal. Description of the Drawings

[0033] The drawings here are incorporated into the specification and form a part of this specification, showing the embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0034] Figure 1 Schematic diagram of the structure of an indicator light driving circuit provided by the present invention Figure 1 ;

[0035] Figure 2 Schematic diagram of the structure of an indicator light driving circuit provided by the present invention Figure 2 ;

[0036] Figure 3 Schematic diagram of the structure of an indicator light driving circuit provided by the present invention Figure 3 .

[0037] Description of the reference numerals: 101 - First indicator light; 102 - Second indicator light; 103 - Control unit; 104 - First power supply; 105 - Second power supply; 106 - First switching device; 107 - Second switching device; 201 - First grounding resistor; 202 - Second grounding resistor; 203 - First pull-up resistor; 204 - Second pull-up resistor; 301 - First MOS transistor; 302 - Second MOS transistor.

[0038] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0039] First of all, those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0040] Secondly, it should be noted that in the description of the present utility model, terms such as "inner", "outer", etc. indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0041] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0042] On the server panel, health indicator lights or power status indicator lights are usually set. These indicator lights are used to display the health status or power status of the server system. Usually, these indicator lights will use different color combinations to represent different status information. For example, a green light may indicate normal operation, while a red light may indicate a fault or warning.

[0043] In one example, the control unit of the indicator light is directly connected to the pull-up power supply. When a certain indicator light needs to be lit, the control unit outputs a corresponding level signal (such as a high-level signal or a low-level signal). However, when the indicator light does not need to be lit, in order to keep it in the off state, the control unit needs to continuously output a high-level signal. This means that even when the indicator light is not lit, the control unit and related circuit components (such as switching devices and resistors) are still continuously working and consuming electrical energy, and continuous loss will lead to waste of electrical energy and an increase in the cost of component replacement.

[0044] In one example, an independent lighting power supply is provided for the indicator light on the server panel. The advantage of this method is that it can control the lighting and extinguishing of the indicator light more flexibly and reduces the dependence on the main control unit. However, this also requires additional circuit design and power management, including wiring on the panel, installing a power socket, and possibly a power conversion circuit. In addition, if the customer requests to install a power protection chip (such as an efuse chip) for the additional power supply, the cost will be further increased.

[0045] Whether it is continuous loss or the use of an additional power supply, it may increase the potential safety hazards of the system. For example, a continuously working circuit may cause a fire due to overheating, and improper management of the additional power supply may also lead to safety problems such as short circuits or electric shocks.

[0046] The present utility model provides an indicator light driving circuit to solve the above problems.

[0047] The following will specifically describe the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems with specific embodiments. These several specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0048] Figure 1 The structural schematic of an indicator light driving circuit provided by the present utility model Figure 1 , as Figure 1 shown, the indicator light driving circuit provided by the present utility model includes: a first indicator light 101, a second indicator light 102, a control unit 103, a first power supply 104, a second power supply 105, a first switching device 106, and a second switching device 107.

[0049] The control signal output terminals of the control unit 103 are respectively connected to the control terminals of the first switching device 106 and the second switching device 107. The first power supply 104 is connected to the anode of the first indicator lamp 101, and the second power supply 105 is connected to the anode of the second indicator lamp 102; the cathode of the first indicator lamp 101 is connected to the anode of the second indicator lamp 102, and the cathode of the second indicator lamp 102 is connected to the anode of the first indicator lamp 101. The first power supply 104 and the second power supply 105 are at the same potential. The first switching device 106 and the second switching device 107 are used to control the lighting of the second indicator lamp 102 according to the first control signal output by the control unit 103 to the first switching device 106; and are used to control the lighting of the first indicator lamp 101 according to the second control signal output by the control unit 103 to the second switching device 107.

[0050] In the present utility model, the drive circuit mainly includes two indicator lamps (the first indicator lamp 101 and the second indicator lamp 102), a control unit 103, two power supplies (the first power supply 104 and the second power supply 105), and two switching devices (the first switching device 106 and the second switching device 107). In particular, the anodes and cathodes of the two indicator lamps are connected in a ring shape to form a "ring-shaped" or "back-to-back" configuration. The first indicator lamp 101 and the second indicator lamp 102 can be two light-emitting diode (LED) indicator lamps to be driven; the control unit 103 is responsible for generating control signals to control the working states of the two switching devices, and thus control the lighting of the indicator lamps; the first power supply 104 and the second power supply 105 provide operating voltages for the indicator lamps. The first power supply 104 and the second power supply 105 can be at the same potential, which means that the first power supply 104 and the second power supply 105 are at the same potential in the circuit and can be regarded as the same power supply; the first switching device 106 and the second switching device 107, these two switching devices determine whether to conduct according to the control signals output by the control unit 103, so as to control the lighting of the indicator lamps.

[0051] The control unit 103 outputs control signals to the first switching device 106 and the second switching device 107 respectively, and these control signals determine the on or off state of the switching devices. When the first control signal of the control unit 103 is sent to the first switching device 106, its ground terminal and output terminal are turned on. This causes the anode of the first indicator light 101 to be connected to the ground, that is, the anode of the first indicator light 101 is at a low potential. Since the cathode of the second indicator light 102 is connected to the anode of the first indicator light 101, the cathode of the second indicator light 102 is at a low potential. The second signal output terminal of the control unit 103 does not output any signal, and the second switching device 107 remains in the off state. The anode of the second indicator light 102 is connected to the second power supply 105 and is at a high potential. Since the cathode of the first indicator light 101 is connected to the anode of the second indicator light 102, the cathode of the first indicator light 101 is at a high potential. Since the anode of the first indicator light 101 is at a low potential and the cathode is at a high potential, the first indicator light 101 goes out. On the contrary, the cathode of the second indicator light 102 is at a low potential and the anode is at a high potential, so a current path is formed and the second indicator light 102 lights up.

[0052] Similarly, when the second control signal of the control unit 103 is sent to the second switching device 107, its ground terminal and output terminal are turned on. Since the second switching device 107 is turned on, the anode of the second indicator light 102 is connected to the ground, that is, the anode of the second indicator light 102 is at a low potential. Since the cathode of the first indicator light 101 is connected to the anode of the second indicator light 102, the cathode of the first indicator light 101 is at a low potential. During this process, the first signal output terminal of the control unit 103 does not output any signal, and the first switching device 106 remains in the off state. The anode of the first indicator light 101 is connected to the first power supply 104 and is at a high potential. Since the cathode of the second indicator light 102 is connected to the anode of the first indicator light 101, the cathode of the second indicator light 102 is at a high potential. Since the anode of the first indicator light 101 is at a high potential and the cathode is at a low potential, a current path is formed, so the first indicator light 101 lights up; on the contrary, the cathode of the second indicator light 102 is at a high potential and the anode is at a low potential, and the second indicator light 102 goes out.

[0053] The present utility model provides an indicator light driving circuit. By controlling the connection between the control unit and the first switching device and the second switching device, independent control of the indicator lights is achieved. Further, the anode of the first indicator light is connected to the first power supply, the anode of the second indicator light is connected to the second power supply, and the cathode of the first indicator light is connected to the anode of the second indicator light, and the cathode of the second indicator light is connected to the anode of the first indicator light, forming a special cross-connection method. The first power supply and the second power supply maintain the same potential. The first switching device and the second switching device respectively control the lighting states of the second indicator light and the first indicator light according to the first control signal and the second control signal output by the control unit. In this way, based on the design of the indicator light driving circuit, the losses of the switching devices and resistors can be effectively reduced, the circuit structure can be simplified, thereby reducing costs, and the reliability and flexibility of the circuit can be improved. Independent control of the indicator lights can be achieved without complex control logic.

[0054] The control signal output terminals of the control unit 103 include a first signal output terminal and a second signal output terminal. The first signal output terminal is connected to the control terminal of the first switching device 106. The second signal output terminal is connected to the control terminal of the second switching device 107.

[0055] In the present utility model, the control unit 103 is the brain of the entire driving circuit, responsible for generating and outputting control signals. These control signals are used to determine which indicator light should be lit. The control unit 103 has two dedicated output terminals, respectively called the first signal output terminal and the second signal output terminal. Each output terminal is responsible for sending a specific control signal. The first signal output terminal is connected to the control terminal of the first switching device 106: This means that when the control unit 103 sends a control signal through the first signal output terminal, this signal will be directly transmitted to the control terminal of the first switching device 106. This control signal determines whether the first switching device 106 should conduct (i.e., allow current to pass through), thereby controlling the lighting state of the second indicator light. The second signal output terminal is connected to the control terminal of the second switching device 107: Similarly, the control signal sent by the control unit 103 through the second signal output terminal will be transmitted to the control terminal of the second switching device 107. This signal controls the conduction state of the second switching device 107, and further controls the lighting of the first indicator light 101.

[0056] Therefore, the control unit of the present utility model respectively controls two switching devices through two different signal output terminals, and each switching device controls the lighting state of an indicator light. This connection method allows the control unit to independently and precisely control each indicator light, achieving flexible control of the indicator lights.

[0057] Figure 2 Schematic structure of an indicator light driving circuit provided by the present utility model Figure 2 , such as Figure 2As shown in the figure, the indicator light driving circuit provided by the present utility model further includes:

[0058] A first grounding resistor 201 and a second grounding resistor 202; the first grounding resistor 201 is located at the intermediate node of the circuit where the first signal output terminal of the control unit 103 is connected to the control terminal of the first switching device 106, and the first grounding resistor 201 is grounded; the second grounding resistor 202 is located at the intermediate node of the circuit where the second signal output terminal of the control unit 103 is connected to the control terminal of the second switching device 107, and the second grounding resistor 202 is grounded.

[0059] A first pull-up resistor 203 and a second pull-up resistor 204; the first pull-up resistor 203 is connected to the first power supply 104 and is located at the intermediate node of the circuit where the output terminal of the first switching device 106 is connected to the first indicator light 101. The first pull-up resistor 203 and the first power supply 104 form a first pull-up power supply; the second pull-up resistor 204 is connected to the second power supply 105 and is located at the intermediate node of the circuit where the output terminal of the second switching device 107 is connected to the second indicator light 102. The second pull-up resistor 204 and the second power supply 105 form a second pull-up power supply.

[0060] The grounding terminal of the first switching device 106 is grounded; the grounding terminal of the second switching device 107 is grounded.

[0061] In the present utility model, there is an intermediate node between the first signal output terminal of the control unit 103 and the control terminal of the first switching device 106. One end of the first grounding resistor 201 is connected to this intermediate node, and the other end of the first grounding resistor 201 is grounded. Such a connection method means that when the first signal output terminal outputs a signal, the signal will reach the control terminal of the first switching device 106 through the first grounding resistor 201. The first grounding resistor 201 provides a stable grounding path, which helps to ensure the stability of the signal and can prevent misoperation caused by signal fluctuations. There is also an intermediate node between the second signal output terminal of the control unit 103 and the control terminal of the second switching device 107. One end of the second grounding resistor 202 is connected to this intermediate node. The other end of the second grounding resistor 202 is grounded. Similarly, when the second signal output terminal outputs a signal, the signal will reach the control terminal of the second switching device 107 through the second signal output terminal. The second grounding resistor 202 also provides a stable grounding path to ensure the accuracy and reliability of the signal.

[0062] Therefore, through the designed first grounding resistor and second grounding resistor, the present utility model provides a stable reference point (i.e., ground) for the circuit. In this way, even if there are certain fluctuations in the control signal, the normal operation of the switching device can be ensured. In addition, the grounding resistor can also help filter out noise and protect the switching device from the influence of transient voltage, thereby improving the stability and reliability of the entire circuit.

[0063] In the present utility model, a pull-up resistor is usually used to ensure that the signal line remains at a definite high-level state when not actively driven. The advantage of doing so is to reduce noise interference and improve the stability of the circuit. The first pull-up resistor 203 is connected to the first power supply 104. It is located at the middle node of the circuit between the output terminal of the first switching device 106 and the first indicator light 101. The first pull-up resistor 203 and the first power supply 104 together constitute the first pull-up power supply. When the first switching device 106 is in the non-activated state, the first pull-up power supply will raise this node in the circuit to the voltage level of the first power supply 104, ensuring that the first indicator light 101 will not malfunction due to an uncertain voltage state. The second pull-up resistor 204 is connected to the second power supply 105. It is located at the middle node of the circuit between the output terminal of the second switching device 107 and the second indicator light 102. The second pull-up resistor 204 and the second power supply 105 together constitute the second pull-up power supply. Similar to the first pull-up resistor 203, the second pull-up resistor 204 is used to ensure that when the second switching device 107 is in the non-activated state, the circuit node where the second indicator light 102 is located remains at a stable high-level state.

[0064] Therefore, through such a connection method in the present utility model, the first pull-up resistor and the second pull-up resistor ensure that the first indicator light and the second indicator light will not be accidentally lit when the first switching device and the second switching device are not conducting. When the control unit issues a control signal to the first switching device or the second switching device to make it conduct, the corresponding indicator light will light up. This not only simplifies the circuit structure, but also reduces the losses in the circuit, while ensuring the reliability and cost-effectiveness of the circuit.

[0065] In the present utility model, the grounding terminals of the first switching device 106 and the second switching device 107 need to be grounded. In the circuit, the ground wire provides a common reference potential point, and all voltage measurements are made relative to this point.

[0066] The first switching device 106 and the second switching device 107 are used to control the second indicator light 102 to light up according to the first control signal output by the control unit 103 to the first switching device 106, including:

[0067] The control unit 103 outputs a first control signal through the first signal output terminal according to the first condition for the second indicator light 102 to light up; under the action of the first control signal, the grounding terminal and the output terminal of the first switching device 106 are conducted; the anode of the first indicator light 101 is at a low potential; the cathode of the second indicator light 102 is at a low potential;

[0068] No signal is output from the second signal output terminal of the control unit 103, and the ground terminal and the output terminal of the second switching device 107 remain disconnected; the cathode of the first indicator lamp 101 is at a high potential; the anode of the second indicator lamp 102 is at a high potential;

[0069] The first indicator lamp 101 goes out, and the second indicator lamp 102 lights up.

[0070] In this utility model, the control unit 103 is mainly responsible for outputting control signals according to specific conditions to control the states of the switching devices; the first switching device 106 and the second switching device 107 change their own on or off states according to the output signals of the control unit 103, thereby controlling the lighting and extinguishing of the indicator lamps; the first indicator lamp 101 and the second indicator lamp 102 are indicator lamps for displaying the circuit state, and the working condition of the circuit is reflected by the lighting and extinguishing of the indicator lamps.

[0071] The control unit 103 monitors whether the condition for lighting the second indicator lamp 102 (referred to as the "first condition") is met. When the first condition is not met, the control unit 103 does not output any signal, and the two switching devices remain in the default state (usually the off state), and both the first indicator lamp 101 and the second indicator lamp 102 are in the off state. When the control unit 103 detects that the first condition is met, it outputs a first control signal through the first signal output terminal. The first control signal is sent to the first switching device 106 to make its ground terminal and output terminal conduct. This causes the anode (positive electrode) of the first indicator lamp 101 to be connected to the ground, that is, the anode of the first indicator lamp 101 is at a low potential. Since the cathode (negative electrode) of the second indicator lamp 102 is connected to the anode of the first indicator lamp 101, the cathode of the second indicator lamp 102 is at a low potential. During this process, no signal is output from the second signal output terminal of the control unit 103, the second switching device 107 is connected to the second ground resistor 202, and the second switching device 107 remains in the off state. The anode of the second indicator lamp 102 is connected to the second power supply 105 and is at a high potential. Since the cathode of the first indicator lamp 101 is connected to the anode of the second indicator lamp 102, the cathode of the first indicator lamp 101 is at a high potential. Since the anode of the first indicator lamp 101 is at a low potential and the cathode is at a high potential, the first indicator lamp 101 goes out. On the contrary, the cathode of the second indicator lamp 102 is at a low potential and the anode is at a high potential, so a current path is formed and the second indicator lamp 102 lights up.

[0072] Therefore, the present utility model outputs a first control signal through the control unit while ensuring that no output is generated at the second signal output terminal. Under the action of the first control signal, the ground terminal and the output terminal of the first switching device form a conducting state. Since there is no signal at the second signal output terminal, the ground terminal and the output terminal of the second switching device remain disconnected. This configuration realizes the independent control of the first indicator light and the second indicator light, and the specific effect is that the first indicator light is turned off while the second indicator light is turned on.

[0073] And for controlling the first indicator light 101 to be turned on according to the second control signal output by the control unit 103, it includes:

[0074] The control unit 103 outputs a second control signal through the second signal output terminal according to the second condition that satisfies the lighting of the first indicator light 101; under the action of the second control signal, the ground terminal and the output terminal of the second switching device 107 are conducted; the anode of the second indicator light 102 is at a low potential; the cathode of the first indicator light 101 is at a low potential;

[0075] No signal is output from the first signal output terminal of the control unit 103, and the ground terminal and the output terminal of the first switching device 106 remain disconnected; the cathode of the second indicator light 102 is at a high potential; the anode of the first indicator light 101 is at a high potential;

[0076] The first indicator light 101 is lit, and the second indicator light 102 is turned off.

[0077] In the present utility model, the control unit 103 is the core control component, responsible for outputting control signals according to specific conditions; the first switching device 106 and the second switching device 107 are controlled by the signals output by the control unit 103 to change their conducting or disconnecting states; the first indicator light 101 and the second indicator light 102 are used to display the circuit state and reflect the working condition of the circuit through lighting and extinguishing.

[0078] The control unit 103 continuously detects whether the condition for turning on the first indicator light 101 (referred to as the "second condition") is met. When the condition is not met, the control unit 103 does not output any signal, the switching device remains in the default state, and both the first indicator light 101 and the second indicator light 102 are in the off state. When the control unit 103 detects that the second condition is met, it outputs a second control signal through the second signal output terminal. The second control signal is sent to the second switching device 107 to make its ground terminal and output terminal conduct. Since the second switching device 107 conducts, the anode of the second indicator light 102 is connected to the ground, that is, the anode of the second indicator light 102 is at a low potential. Because the cathode of the first indicator light 101 is connected to the anode of the second indicator light 102, the cathode of the first indicator light 101 is at a low potential. During this process, the first signal output terminal of the control unit 103 does not output any signal, the first switching device 106 is connected to the first ground resistor 201, and the first switching device 107 remains in the off state. The anode of the first indicator light 101 is connected to the first power supply 104 and is at a high potential. Because the cathode of the second indicator light 102 is connected to the anode of the first indicator light 101, the cathode of the second indicator light 102 is at a high potential. Since the anode of the first indicator light 101 is at a high potential and the cathode is at a low potential, a current path is formed, so the first indicator light 101 lights up; on the contrary, the cathode of the second indicator light 102 is at a high potential and the anode is at a low potential, so the second indicator light 102 is turned off.

[0079] Therefore, in the present invention, the control unit outputs a second control signal while ensuring that no output is generated at the first signal output terminal. Under the action of the second control signal, the ground terminal and the output terminal of the first switching device will form a conducting state. However, since there is no signal at the first signal output terminal, the ground terminal and the output terminal of the first switching device remain disconnected. This configuration realizes the independent control of the first indicator light and the second indicator light, and the specific effect is that the first indicator light is lit while the second indicator light is turned off.

[0080] Both the first switching device 106 and the second switching device 107 are MOS transistors.

[0081] In the present invention, both the first switching device 106 and the second switching device 107 are Metal-Oxide-Semiconductor Field-Effect Transistors (MOS transistors). MOS transistors are voltage-controlled semiconductor devices widely used in electronic devices and integrated circuits. It uses the electric field effect to control the flow of current and has the advantages of high input impedance, low noise, low power consumption, large dynamic range, easy integration, no secondary breakdown phenomenon, and wide safe operating area.

[0082] Therefore, by using MOS transistors as the first and second switching devices, the present utility model can provide an efficient, reliable, and low-power switching control function.

[0083] The first power supply 104 and the second power supply 105 output positive power supply signals.

[0084] In the present utility model, the first power supply 104 and the second power supply 105 output positive power supply signals. A positive power supply signal generally means that the voltage output by the power supply is a positive voltage, that is, the voltage value is higher than the ground potential (or called zero potential, reference potential). In contrast, a negative voltage means that the voltage value is lower than the ground potential.

[0085] Figure 3 Structural schematic of an indicator light driving circuit provided by the present utility model Figure 3 , such as Figure 3 As shown, the indicator light driving circuit provided by the present utility model includes: a first indicator light 101, a second indicator light 102, a control unit 103, a first power supply 104, a second power supply 105, a first grounding resistor 201, a second grounding resistor 202, a first pull-up resistor 203, a second pull-up resistor 204, a first MOS transistor 301, and a second MOS transistor 302.

[0086] In one example, the first MOS transistor 301 is, for example, an N-type metal-oxide-semiconductor (NMOS) transistor; the second MOS transistor 302 is, for example, an NMOS transistor.

[0087] The control unit 103 is mainly responsible for outputting a control signal according to specific conditions to control the state of the NMOS transistors; the first and second NMOS transistors change their own on or off states according to the output signal of the control unit 103, thereby controlling the lighting and extinguishing of the indicator lights; the first indicator light 101 and the second indicator light 102 are indicator lights for displaying the circuit state, and the working condition of the circuit is reflected by the lighting and extinguishing of the indicator lights.

[0088] The control unit 103 continuously detects whether the condition for turning on the first indicator light 101 is met. When the condition is not met, the control unit 103 does not output any signal, and the two NMOS transistors remain in their default states. Both the first indicator light 101 and the second indicator light 102 are in the off state. When the control unit 103 detects that the condition for turning on the first indicator light 101 is met, it outputs a second control signal through the second signal output terminal. The second control signal is at a high potential and acts on the second NMOS transistor. When the gate (G) of the second NMOS transistor receives a high level, it acts like a resistor and introduces current into the channel, thus creating a circuit path. At this time, the internal channel conducts under the action of the electric field strength, and current can flow from the source (S) electrode to the drain (D) electrode. Since the second NMOS transistor is conducting, the anode of the second indicator light 102 is connected to the ground, that is, the anode of the second indicator light 102 is at a low potential. Because the cathode of the first indicator light 101 is connected to the anode of the second indicator light 102, the cathode of the first indicator light 101 is at a low potential. During this process, the first signal output terminal of the control unit 103 does not output any signal. Therefore, the first NMOS transistor acts like an open switch, closing the internal channel. At this time, no current can flow from the S electrode to the D electrode, thus interrupting the circuit. The anode of the first indicator light 101 is connected to the first power supply 104 and remains at a high potential. Because the cathode of the second indicator light 102 is connected to the anode of the first indicator light 101, the cathode of the second indicator light 102 is at a high potential. Since the anode of the first indicator light 101 is at a high potential and the cathode is at a low potential, a current path is formed, so the first indicator light is on; on the contrary, the cathode of the second indicator light 102 is at a high potential and the anode is at a low potential, so the second indicator light 102 is off.

[0089] The control unit 103 monitors whether the condition for the second indicator light 102 to light up is met. When this condition is not met, the control unit 103 does not output any signal, and the two NMOS transistors remain in their default state (usually the off state), and both the first indicator light 101 and the second indicator light 102 are in the off state. When the control unit 103 detects that the condition for the second indicator light 102 to light up is met, it outputs a first control signal through the first signal output terminal. The first control signal is at a high potential and acts on the first NMOS transistor. When the G pole of the first NMOS transistor receives a high potential, it acts as a resistor and introduces current into the channel, thereby creating a circuit path. At this time, the internal channel conducts under the action of the electric field strength, and current can flow from the S pole to the D pole. This causes the anode of the first indicator light 101 to be connected to the ground, that is, the anode of the first indicator light 101 is at a low potential. Since the cathode of the second indicator light 102 is connected to the anode of the first indicator light 101, the cathode of the second indicator light 102 is at a low potential. During this process, the second signal output terminal of the control unit 103 does not output any signal. Therefore, the second NMOS transistor acts as an open switch and closes the internal channel. At this time, no current can flow from the S pole to the D pole, thus interrupting the circuit. The anode of the second indicator light 102 is connected to the first power supply 104 and remains at a high potential. Since the cathode of the first indicator light 101 is connected to the anode of the second indicator light 102, the cathode of the first indicator light 101 is at a high potential. Since the anode of the first indicator light 101 is at a low potential and the cathode is at a high potential, the first indicator light 101 is turned off. On the contrary, the cathode of the second indicator light 102 is at a low potential and the anode is at a high potential, so a current path is formed and the second indicator light 102 lights up.

[0090] In one example, the first control signal is a green signal and the second control signal is a red signal. When the first signal output terminal of the control unit 103 emits a green signal, the second indicator light 102 will light up green; when the second signal output terminal of the control unit 103 emits a red signal, the second indicator light 102 will light up red.

[0091] Therefore, the utility model realizes the independent control of the first indicator light and the second indicator light by the control unit outputting the first control signal and not generating any output at the second signal output terminal: when the control unit outputs the first control signal with a high potential through the first signal output terminal, the gate of the first NMOS transistor receives the high-level signal, causing the internal channel to conduct, and the current can flow from the source to the drain, so that the anode of the first indicator light is connected to the ground and is at a low potential; since the cathode of the second indicator light is connected to the anode of the first indicator light, the cathode of the second indicator light is also at a low potential; and there is no signal output at the second signal output terminal, making the second NMOS transistor equivalent to an open switch, so the anode of the second indicator light remains at a high potential; since the cathode of the first indicator light is connected to the anode of the second indicator light, the cathode of the first indicator light is at a high potential, but the anode is at a low potential, resulting in the first indicator light being extinguished, while the second indicator light is lit due to the current loop formed by the high potential of the anode and the low potential of the cathode. This design can realize the independent control of the two indicator lights only by controlling the first control signal or the second control signal, which not only simplifies the circuit structure, reduces the manufacturing cost, but also reduces the losses of the switching devices and resistors, and improves the reliability and safety of the circuit.

[0092] Finally, it should be noted that: after considering the specification and practicing the utility model disclosed herein, those skilled in the art will readily think of other implementation schemes of the utility model. The utility model aims to cover any variations, uses or adaptations of the utility model, which follow the general principles of the utility model and include the common general knowledge or conventional technical means in the technical field not disclosed by the utility model. It is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the utility model is only limited by the appended claims.

Claims

1. An indicator driving circuit, characterized in that, The indicator light driving circuit includes: a first indicator light, a second indicator light, a control unit, a first power supply, a second power supply, a first switching device, and a second switching device; The control signal output terminals of the control unit are respectively connected to the control terminals of the first switching device and the second switching device; The first power supply is connected to the anode of the first indicator light, and the second power supply is connected to the anode of the second indicator light; the cathode of the first indicator light is connected to the anode of the second indicator light, and the cathode of the second indicator light is connected to the anode of the first indicator light; The first power supply and the second power supply are at the same potential; The first switching device and the second switching device are used to control the second indicator light to light up according to the first control signal output by the control unit to the first switching device; And used to control the first indicator light to light up according to the second control signal output by the control unit to the second switching device.

2. The indicator light driving circuit according to claim 1, wherein The control signal output terminals of the control unit include a first signal output terminal and a second signal output terminal; The first signal output terminal is connected to the control terminal of the first switching device; The second signal output terminal is connected to the control terminal of the second switching device.

3. The indicator light driving circuit according to claim 2, wherein The indicator light driving circuit includes: a first grounding resistor and a second grounding resistor; The first grounding resistor is located at the intermediate node of the indicator light driving circuit where the first signal output terminal of the control unit is connected to the control terminal of the first switching device, and the first grounding resistor is grounded; The second grounding resistor is located at the intermediate node of the indicator light driving circuit where the second signal output terminal of the control unit is connected to the control terminal of the second switching device, and the second grounding resistor is grounded.

4. The indicator light driving circuit according to claim 3, wherein The indicator light driving circuit further includes: a first pull-up resistor and a second pull-up resistor; The first pull-up resistor is connected to the first power supply and is located at the intermediate node of the indicator light driving circuit where the output terminal of the first switching device is connected to the first indicator light. The first pull-up resistor and the first power supply form the first pull-up power supply; The second pull-up resistor is connected to the second power supply and is located at the intermediate node of the indicator light driving circuit where the output terminal of the second switching device is connected to the second indicator light. The second pull-up resistor and the second power supply form the second pull-up power supply.

5. The indicator light driving circuit according to claim 4, characterized in that The indicator light driving circuit includes: The grounding terminal of the first switching device is grounded; The grounding terminal of the second switching device is grounded.

6. The indicator light driving circuit according to claim 1, wherein The first switching device and the second switching device are used to control the second indicator light to light up according to the first control signal output by the control unit to the first switching device, including: The control unit outputs the first control signal through the first signal output terminal according to the first condition that satisfies the lighting of the second indicator light; under the action of the first control signal, the grounding terminal and the output terminal of the first switching device are conducted; the anode of the first indicator light is at a low potential; the cathode of the second indicator light is at a low potential; No signal is output from the second signal output terminal of the control unit, and the grounding terminal and the output terminal of the second switching device remain disconnected; the cathode of the first indicator light is at a high potential; the anode of the second indicator light is at a high potential; The first indicator light goes out and the second indicator light lights up.

7. The indicator light driving circuit according to claim 1, characterized in that, And for controlling the first indicator light to light up according to the second control signal output by the control unit to the second switching device, including: The control unit outputs the second control signal through the second signal output terminal according to the second condition that satisfies the lighting of the first indicator light; under the action of the second control signal, the grounding terminal and the output terminal of the second switching device are conducted; the anode of the second indicator light is at a low potential; the cathode of the first indicator light is at a low potential; No signal is output from the first signal output terminal of the control unit, and the grounding terminal and the output terminal of the first switching device remain disconnected; the cathode of the second indicator light is at a high potential; the anode of the first indicator light is at a high potential; The first indicator light lights up and the second indicator light goes out.

8. The indicator light driving circuit according to any one of claims 1-7, characterized in that Both the first switching device and the second switching device are MOS transistors.

9. The indicator light driving circuit according to any one of claims 1-7, characterized in that, The first power supply and the second power supply output a positive power supply signal.

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