High voltage inductor circuit

Abstract

A high voltage inductor circuit includes a high voltage power supply input and a switching power supply circuit. The output of the high-voltage power supply is connected to the input end of the rectifier bridge DB1, and the positive electrode output of the rectifier bridge DB1 is connected to the DC positive electrode through the inductor L1. And the DC positive electrode is connected with a main control chip U1. The HV pin of the main control chip U1 is connected with the DC positive electrode through the sampling resistor R3 and is used for detecting the voltage value of the high-voltage power supply. And a DRAIN pin of the main control chip U1 is connected with the direct current cathode through the inductor T1 and is used for controlling the output of the high-voltage power supply. The PWM pin of the main control chip U1 is connected with the PWM output of the induction circuit, and is used for receiving the control signal of the induction circuit.

Description

Technical Field

[0001] This invention relates to the fields of power electronics and sensor technology, specifically to a high-voltage sensor circuit, which is particularly suitable for high-voltage power supply systems that require intelligent control based on ambient light and human activity, such as intelligent lighting systems and security systems. Background Technology

[0002] Existing technologies include some high-voltage power supply control devices with sensing functions, but their functions are relatively limited. For example, they can only control based on ambient light or human activity, failing to achieve intelligent control that considers both. Furthermore, the circuit structures of existing technologies are typically complex and costly, making them difficult to meet the needs of practical applications. More importantly, existing circuits directly connect the sensors to the output circuit, meaning the sensors cannot be turned off independently; output adjustments can only be made while the circuit is in use. For instance, for circuits containing photosensitive devices, the entire circuit only forms a complete circuit and its effectiveness can be tested in a low-brightness environment that matches the lighting requirements. This necessitates that installation and debugging time be consistent with the actual usage environment. Since these are high-voltage circuits requiring professional electricians for installation, it is usually difficult to simulate low-brightness environments such as nighttime during normal working hours, making it impossible to determine the actual effect of the product after installation. This increases installation labor costs and adds to the difficulty of debugging. Summary of the Invention

[0003] To address the aforementioned issues, this invention aims to provide a high-voltage sensor circuit capable of simultaneously sensing ambient light and human activity, enabling intelligent control of the high-voltage power supply. Furthermore, it allows for independent control and debugging of the sensor component without relying on a specific operating environment, thereby improving energy efficiency, extending equipment lifespan, and reducing installation and debugging costs.

[0004] To achieve the above objectives, the core of the high-voltage inductor circuit designed in this invention lies in its unique circuit structure and control method, as detailed below:

[0005] The sensor circuit includes a high-voltage power supply input and a switching power supply circuit. The high-voltage power supply output is connected to the input terminal of rectifier bridge DB1, and the positive output of rectifier bridge DB1 is connected to the DC positive terminal through inductor L1. The main control chip U1 is connected to the DC positive terminal. The HV pin of the main control chip U1 is connected to the DC positive terminal through sampling resistor R3 to detect the voltage value of the high-voltage power supply. The DRAIN pin of the main control chip U1 is connected to the DC negative terminal through inductor T1 to control the output of the high-voltage power supply. The PWM pin of the main control chip U1 is connected to the PWM output of the sensing circuit to receive control signals from the sensing circuit.

[0006] The sensing circuit is powered by a step-down switching circuit and includes a sensor and a control switch SW that controls whether the sensor is operating. The sensor typically includes an infrared sensor and a photosensor. The DC positive terminal is connected to the step-down switching circuit via a forward-biased diode D2, providing it with power. This design allows the sensing circuit to be powered and controlled independently of the high-voltage circuit, enabling adjustment of the DC output in any environment without being affected by the sensing circuit. For example, under normal daylight conditions, the PWM output of the sensing circuit can be turned off by the control switch SW, directly verifying whether the switching circuit output is normal, i.e., whether the equipment is operating normally.

[0007] Furthermore, the buck switching circuit includes a buck control chip U2, which converts high-voltage DC to low-voltage DC to power the induction circuit. The specific connection method of the buck control chip U2 is as follows: the DRN pin of the buck control chip U2 is connected to diode D2, and the DRN pin of the buck control chip U2 is grounded through the filter capacitor CE3. The SGND pin of the buck control chip U2 is grounded. The VOUT pin of the buck control chip U2 is connected to the low-voltage DC output and is also grounded through the parallel filter capacitor CE4 and resistor R6. The VCC pin of the buck control chip U2 is directly connected to the SEL pin of the buck control chip U2. The VCC pin of the buck control chip U2 and the CGND pin of the buck control chip U2 are connected through capacitor C1. The CGND pin of the buck control chip U2 is connected to the low-voltage DC output through inductor L2.

[0008] The sensing circuit includes a sensing control chip U3, which processes signals from the infrared sensor and the phototransistor, and outputs a PWM control signal to the main control chip U1. Pin K1 of the sensing control chip U3 is grounded via a control switch SW, controlling the operating state of the sensing control chip U3. Pin K1 of the sensing control chip U3 is grounded via the control switch SW. Pin CDS of the sensing control chip U3 is connected to the phototransistor Q1, and pin PIR of the sensing control chip U3 is connected to the passive infrared sensor. The sensing control chip U3, phototransistor Q1, and passive infrared sensor are all powered by a 3.3V low-voltage DC power supply. Pin OUT of the sensing control chip U3 is connected to the PWM output.

[0009] The preferred model for the main control chip U1 is MT9712S, the preferred model for the step-down control chip U2 is MT8813S0, and the preferred model for the sensing control chip U3 is AT082-SOP8. The selection of these chips can further improve the performance and stability of the circuit.

[0010] Through the above circuit structure and control method, the high-voltage sensor circuit of the present invention can intelligently control the output of the high-voltage power supply according to the ambient light and human activity, and can be easily installed and debugged without relying on a specific usage environment, thereby effectively solving the problems existing in the prior art.

[0011] The innovation of this invention lies in:

[0012] The high-voltage power supply and induction function are integrated into a single circuit. By combining the high-voltage power supply circuit and the induction circuit, the circuit structure is simplified, costs are reduced, and the system's integration and reliability are improved.

[0013] This invention enables independent testing of the separate sensor components. The sensor's operating state can be controlled independently via a control switch, eliminating the need for debugging in specific environments or at specific times, thus reducing the difficulty and cost of installation and debugging.

[0014] Specifically, the high-voltage inductor circuit of the present invention can achieve its function in the following ways:

[0015] The high-voltage power input provides high-voltage electrical energy to the circuit, which is then rectified by the rectifier bridge to obtain DC high-voltage electricity.

[0016] The main control chip U1 controls the output voltage of the switching power supply circuit based on the voltage information collected by the HV pin, and controls the working state of the sensing circuit through the PWM pin.

[0017] The step-down switching circuit converts high-voltage DC power into low-voltage DC power to supply power to the induction circuit.

[0018] When a sensor detects movement of a human or object, it outputs a corresponding signal.

[0019] The control switch can control whether the sensor works, making it convenient to conduct independent tests.

[0020] The PWM output of the sensing circuit is connected to the PWM pin of the main control chip U1, which can control the output of the switching power supply circuit, thereby realizing the sensing control function.

[0021] The high-voltage inductor circuit of the present invention has the following advantages:

[0022] The circuit structure is simple and the cost is low.

[0023] It has high integration and good reliability.

[0024] Installation and debugging are convenient, reducing labor costs.

[0025] Suitable for applications requiring high-voltage power supply and induction control functions. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the switching power supply circuit in Example 1.

[0027] Figure 2 This is a schematic diagram of the sensing circuit in Example 1.

[0028] Figure 3 This is a schematic diagram of the step-down switching circuit in Example 1.

[0029] Figure 4 This is a flowchart of the high-voltage lamp control method in Example 1. Detailed Implementation

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] Example 1.

[0032] The high-voltage sensor circuit in this embodiment is as follows: Figure 1 , Figure 2 , Figure 3 As shown, its control process combines Figure 4 The flowchart shown is used for illustration.

[0033] 1. High-voltage power input and switching power supply circuit ( Figure 1 ):

[0034] The AC high voltage (AC_L, AC_N) input is connected to the rectifier bridge DB1 (MB10S) ​​via fuse FR1 to convert the AC power into pulsating DC power. The pulsating DC power is then filtered by an LC filter circuit consisting of inductor L1, resistor R1, and grounded filter capacitors CE1 and CE2 to obtain a stable DC high voltage. This DC high voltage is connected to the HV pin of the main control chip U1 (MT9712S) via sampling resistor R3 (3.3K) to detect the high voltage value. The DRAIN pin of the main control chip U1 is connected to the DC negative terminal (GND) via inductor T1 to control the output of the high voltage power supply; in this embodiment, it directly drives the LED lights (LED+, LED-). The PWM pin of the main control chip U1 is connected to the PWM output of the sensing circuit to receive control signals from the sensing circuit. Capacitor CY1 is the resonant capacitor of T1 and is used to filter out high-frequency noise.

[0035] 2. Step-down switching circuit ( Figure 3 ):

[0036] The DC positive terminal on the high-voltage side supplies power to the buck switching circuit through diode D2 (M7). Diode D2 is a Schottky diode, characterized by low voltage drop and fast switching. The DRN pin of the buck control chip U2 (MT8813S0) is connected to the cathode of diode D2. The DRN pin of the buck control chip U2 is also grounded through filter capacitor CE3 to filter out high-frequency noise. The SGND pin of the buck control chip U2 is grounded. The VOUT pin of the buck control chip U2 outputs a low-voltage DC of 3.3V and is grounded through an RC network consisting of a parallel filter capacitor CE4 and a resistor R6 (1K). The VCC and SEL pins of the buck control chip U2 are directly connected. The VCC and CGND pins of the buck control chip U2 are connected through filter capacitor C1 (1uF / 50V). The CGND pin of the buck control chip U2 is connected to the low-voltage DC output terminal (3.3V) through inductor L2. Inductor L2 and capacitor C1 form an LC filter circuit to further stabilize the output voltage.

[0037] 3. Induction circuit ( Figure 2 ):

[0038] The sensing circuit includes a sensing control chip U3, a phototransistor Q1 (PhotoNPN), and a passive infrared sensor. The VDD and GND pins of the sensing control chip U3 are connected to a 3.3V low-voltage DC power supply and ground, respectively. The CDS pin of U3 is connected to the collector of the phototransistor Q1 for detecting ambient light intensity. The emitter of the phototransistor Q1 is grounded. The PIR pin of the phototransistor U3 is connected to the output of the passive infrared sensor for detecting human activity. The K1 pin of the sensing control chip U3 is grounded through a control switch SW, controlling the operating state of the sensing circuit. When switch SW is closed, the K1 pin of the sensing control chip U3 is grounded, and the sensing circuit operates; when switch SW is open, the K1 pin of the sensing control chip U3 is floating, and the sensing circuit does not operate. The OUT pin of the sensing control chip U3 outputs a PWM control signal to the PWM pin of the main control chip U1. Capacitors C2 and C3 (104uF) are filter capacitors used to stabilize the power supply voltage of the sensing control chip U3. Resistors R2 and R4 are pull-up resistors used to pull the PIR and CDS signals to a high level.

[0039] like Figure 4 As shown, in this case, the switching power supply circuit directly drives the LED light, and the sensing control chip U3 of the sensing circuit includes multiple output modes. The specific control method is as follows:

[0040] start:

[0041] The system waits for the switching power supply circuit to connect to mains power. If mains power is not connected, the system remains in a waiting state.

[0042] If mains power is connected, enter mode A.

[0043] Mode A (default mode):

[0044] Function: The light is always on at a low brightness, without sensor control, and does not distinguish between day and night.

[0045] Operation: If you press the switch SW, you will switch to mode B; if you do not press the switch, you will remain in mode A.

[0046] Mode B (Light Sensing Mode):

[0047] Function: The sensor control chip U2 outputs PWM based on the signal from the phototransistor Q1, and the brightness of the lamp depends on the light sensor. Specifically, the lamp is off during the day and stays on at 50% brightness at night.

[0048] Operation: If you press the switch SW, you will switch to mode C; if you do not press the switch, you will remain in mode B.

[0049] Mode C (Light Sensing + Sensor Mode):

[0050] Function: The sensor control chip U2 outputs PWM based on the signals from the phototransistor Q1 and the passive infrared sensor. Specifically, the light is off during the day, turns on at 100% brightness for 1 minute when someone is detected at night, and then remains on at 50% brightness after the person leaves.

[0051] Operation: If the switch is pressed, the mode will switch to mode D; if the switch is not pressed, the mode will remain in mode C.

[0052] Mode D (Light Sensing + Sensor Mode):

[0053] Function: The sensor control chip U2 outputs PWM based on the signals from the phototransistor Q1 and the passive infrared sensor. Specifically, the light remains off during the day, turns on at 100% brightness for one minute at night when someone is detected, and turns off after the person leaves.

[0054] Operation: If the switch is pressed at this time, the light will be turned off / control will end; if the switch is not pressed, the mode D state will continue.

[0055] Turn off the lights / End:

[0056] The system returns to its initial state and waits for mains power to be connected.

[0057] When professionals install and debug the system, they can test the LED status directly in the default mode, and then switch between different modes to ensure that the installation is complete and the functions are working properly. In actual use, the appropriate mode should be set as needed.

[0058] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0059] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-voltage inductor circuit, comprising a high-voltage power input and a switching power supply circuit, characterized in that: A high-voltage power supply is connected to the input terminal of rectifier bridge DB1. The positive output of rectifier bridge DB1 is connected to the DC positive terminal through inductor L1, and a main control chip U1 is connected to the DC positive terminal. The HV pin of the main control chip U1 is connected to the DC positive terminal through sampling resistor R3, and the DRAIN pin of the main control chip U1 is connected to the DC negative terminal through inductor T1. The PWM pin of the main control chip U1 is connected to the PWM output of the sensing circuit. The sensing circuit is powered by a step-down switching circuit and includes a sensor and a control switch SW that controls whether the sensor is working. The DC positive terminal is connected to the step-down switching circuit through a forward-connected diode D2.

2. The high-voltage inductor circuit according to claim 1, characterized in that: The buck switching circuit includes a buck control chip U2. The DRN pin of the buck control chip U2 is connected to diode D2, and the DRN pin of the buck control chip U2 is grounded through filter capacitor CE3. The SGND pin of the buck control chip U2 is grounded. The VOUT pin of the buck control chip U2 is connected to the low-voltage DC output and is also grounded through a parallel filter capacitor CE4 and resistor R6. The VCC pin of the buck control chip U2 is directly connected to the SEL pin of the buck control chip U2. The VCC pin of the buck control chip U2 and the CGND pin of the buck control chip U2 are connected through capacitor C1. The CGND pin of the buck control chip U2 is connected to the low-voltage DC output through inductor L2.

3. The high-voltage inductor circuit according to claim 1, characterized in that: The sensing circuit includes a sensing control chip U3. The K1 pin of the sensing control chip U3 is grounded through the control switch SW. The CDS pin of the sensing control chip U3 is connected to the phototransistor Q1. The PIR pin of the sensing control chip U3 is connected to the passive infrared sensor. The sensing control chip U3, the phototransistor Q1, and the passive infrared sensor are all powered by a 3.3V low-voltage DC power supply. The OUT pin of the sensing control chip U3 is connected to the PWM output.

4. The high-voltage inductor circuit according to claim 3, characterized in that: The passive infrared sensor's D pin is connected to a low-voltage DC power supply, and its G pin is grounded; the phototransistor Q1's C pin is connected to a low-voltage DC power supply through resistor R2, and its E pin is grounded.

5. The high-voltage inductor circuit according to any one of claims 1-4, characterized in that: The main control chip U1 is not MT9712S.

6. The high-voltage inductor circuit according to claim 1 or 2, characterized in that: The step-down control chip U2 is MT8813S0.

7. The high-voltage inductor circuit according to claim 1, 3, or 4, characterized in that: The sensing control U3 is AT082-SOP8 here.

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