High voltage inductor circuit

Abstract

The utility model relates to a high-voltage inductor circuit which comprises 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] The utility model relates to power electronics technology and sensor technology field, concretely relates to a high voltage inductor circuit, especially suitable for the high voltage power supply system that needs to carry out intelligent control according to ambient light and human activity, such as intelligent lighting system, security system etc. BACKGROUND

[0002] In prior art, there are some high voltage power supply control devices with induction function, but its function is relatively single, for example, can only control according to ambient light or only according to human activity, cannot realize the intelligent control of both. And, the circuit structure of prior art is usually relatively complex, cost is higher, difficult to meet the demand of practical application. More importantly, the circuit of prior art directly connects inductor in output circuit, inductor cannot be closed alone, can only debug output in use state. For example, for the circuit containing photosensitive device, only in the low brightness environment that meets the light setting, the whole circuit forms complete path, can test effect. This leads to the time of installation and debugging must be consistent with actual use environment. And because it is high voltage circuit, needs professional electrician to install, in conventional working hours, it is usually difficult to simulate low brightness environment such as night, also cannot determine the actual effect after product installation, thereby improves the labor cost of installation, also increases the difficulty of debugging. SUMMARY

[0003] In order to solve the above problems, the utility model aims at providing a high voltage inductor circuit, which can simultaneously sense ambient light and human activity, realize intelligent control of high voltage power supply, and independently control and debug the inductor part, without relying on specific use environment, thereby improving energy utilization efficiency, prolonging the service life of equipment and reducing installation and debugging cost.

[0004] In order to achieve the above purpose, the core of the high voltage inductor circuit of the utility model is its unique circuit structure and control mode, as follows:

[0005] The inductor circuit includes high voltage power supply input and switching power supply circuit. The high voltage power supply output is connected to the input end of rectifier bridge DB1, and the positive output of rectifier bridge DB1 is connected to the DC positive pole through inductor L1. The main control chip U1 is connected to the DC positive pole. The HV pin of main control chip U1 is connected to the DC positive pole through sampling resistor R3, for detecting the voltage value of high voltage power supply. The DRAIN pin of main control chip U1 is connected to the DC negative pole through inductor T1, for controlling the output of high voltage power supply. The PWM pin of main control chip U1 is connected to the PWM output of induction circuit, for receiving the control signal of induction circuit.

[0006] The induction circuit is powered by the step-down switch circuit and comprises an inductor and a control switch SW for controlling the operation of the inductor, wherein the inductor generally comprises an infrared inductor and a photosensitive inductor.

[0007] Further, the step-down switch circuit comprises a step-down control chip U2 for converting high-voltage direct current into low-voltage direct current to power the induction circuit.

[0008] The induction circuit comprises an induction control chip U3 for processing signals from the infrared inductor and the photosensitive triode and outputting a PWM control signal to the main control chip U1.

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

[0010] With the above circuit structure and control mode, the high-voltage inductor circuit of the utility model can intelligently control the output of the high-voltage power supply according to the ambient light and human activity, and can be conveniently installed and debugged without relying on a specific use environment, thereby effectively solving the problems in the prior art.

[0011] The utility model discloses an innovative point in that:

[0012] High voltage power supply and induction function are integrated in a circuit. By integrating high voltage power supply circuit and induction circuit together, the circuit structure is simplified, the cost is reduced, and the integration degree and reliability of the system are improved.

[0013] The independent test function of the separated inductor part is realized. The utility model discloses through control switch can control the working condition of inductor alone, need not carry out debugging in specific environment or specific time, reduced the difficulty and cost of installation debugging.

[0014] Specifically, the high voltage inductor circuit of the utility model can realize its function through the following mode:

[0015] High voltage power supply input provides high voltage electric energy for the circuit, and after rectification bridge rectification, obtains direct current high voltage.

[0016] The main control chip U1 controls the output voltage of switching power supply circuit according to the voltage information collected to HV foot, and controls the working condition of induction circuit through PWM foot.

[0017] The step-down switching circuit converts direct current high voltage into low voltage direct current and supplies power for induction circuit and power supply.

[0018] When the inductor senses the movement of human body or object, corresponding signal will be outputted.

[0019] The control switch can control whether the inductor works or not, and facilitates independent test.

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

[0021] The high voltage inductor circuit of the utility model has the following advantages:

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

[0023] The integration degree is high, and the reliability is good.

[0024] Installation and debugging are convenient, and the labor cost is reduced.

[0025] It is applicable to the occasion that needs high voltage power supply and has induction control function. DRAWINGS

[0026] Figure 1 It is the switching power supply circuit schematic drawing of example 1.

[0027] Figure 2 It is the induction circuit schematic drawing of example 1.

[0028] Figure 3 is a schematic diagram of the voltage reduction switch circuit of embodiment 1.

[0029] Figure 4 is a flow chart of the high voltage lamp control mode of embodiment 1. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings, it should be understood that the preferred embodiments described here are only used to illustrate and explain the present application, and are not used to limit the present application.

[0031] Embodiment 1.

[0032] The high voltage inductor circuit of the present embodiment is shown in Figure 1 , Figure 2 , Figure 3 , and its control process is described in conjunction with the flow chart shown in Figure 4 .

[0033] 1. High voltage power input and switching power circuit (V1) Figure 1 ):

[0034] The AC high voltage (AC_L, AC_N) input is connected to the rectifier bridge DB1 (MB10S) through the fuse FR1 to convert AC to pulsating DC. The pulsating DC passes through the LC filter circuit composed of the inductor L1, the resistor R1 and the ground filter capacitor CE1, CE2 to obtain stable DC high voltage. The DC high voltage is connected to the HV pin of the main control chip U1 (MT9712S) through the sampling resistor R3 (3.3K) for detecting the high voltage value. The DRAIN pin of the main control chip U1 is connected to the DC negative electrode (GND) through the inductor T1 for controlling the output of the high voltage power supply, which is directly driving the LED lamp (LED+, LED-) in the present embodiment. The PWM pin of the main control chip U1 is connected to the PWM output of the sensing circuit for receiving the control signal of the sensing circuit. The capacitor CY1 is the resonance capacitor of T1 for filtering high frequency noise.

[0035] 2. Voltage reduction switch circuit (V2) Figure 3 ):

[0036] The high-voltage side direct current positive electrode supplies power to the step-down switch circuit through diode D2 (M7). Diode D2 is a Schottky diode, which has the characteristics of low voltage drop and fast switching. The DRN pin of the step-down control chip U2 (MT8813S0) is connected to the cathode of diode D2. The DRN pin of the step-down control chip U2 is also connected to ground through filter capacitor CE3, which filters out high-frequency noise. The SGND pin of the step-down control chip U2 is connected to ground. The VOUT pin of the step-down control chip U2 outputs 3.3V low-voltage direct current and is connected to ground through an RC network composed of parallel filter capacitor CE4 and resistor R6 (1K). The VCC pin and the SEL pin of the step-down control chip U2 are directly connected. The VCC pin and the CGND pin of the step-down control chip U2 are connected through filter capacitor C1 (1uF / 50V). The CGND pin of the step-down control chip U2 is connected to the low-voltage direct current output end (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 (M7) Figure 2 ):

[0038] The induction circuit includes induction control chip U3, photo-sensitive triode Q1 (PhotoNPN) and passive infrared sensor. The VDD pin and the GND pin of the induction control chip U3 are connected to 3.3V low-voltage direct current power supply and ground respectively. The CDS pin of U3 is connected to the collector of photo-sensitive triode Q1, which is used to detect the intensity of ambient light. The emitter of photo-sensitive triode Q1 is connected to ground. The PIR pin of photo-sensitive triode U3 is connected to the output of passive infrared sensor, which is used to detect human activity. The K1 pin of the induction control chip U3 is connected to ground through control switch SW, which controls the working state of the induction circuit. When the switch SW is closed, the K1 pin of the induction control chip U3 is connected to ground, and the induction circuit works; when the switch SW is opened, the K1 pin of the induction control chip U3 is suspended, and the induction circuit does not work. The OUT pin of the induction 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 supply voltage of the induction control chip U3. Resistors R2 and R4 are pull-up resistors used to pull the signals of PIR and CDS to high level.

[0039] As Figure 4 shown in the present case, as described above, the switch power supply circuit directly drives the LED lamp, and the induction control chip U3 of the induction circuit contains multiple output modes. The specific control method is as follows:

[0040] Start:

[0041] Wait for the switch power supply circuit to be connected to the mains, if not connected to the mains, remain in the waiting state.

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

[0043] Mode A (default mode):

[0044] Function: The light is always on with low brightness, and there is no induction control, and it does not distinguish between day and night.

[0045] Operation: At this time, if the switch SW is pressed, it switches to mode B; if the switch is not pressed, it continues to maintain the state of mode A.

[0046] Mode B (light sensing mode):

[0047] Function: The induction control chip U2 outputs PWM according to the signal output of the phototransistor Q1, and the brightness of the lamp depends on light sensing. Specifically, the lamp is not on during the day, and the lamp is always on with 50% brightness at night.

[0048] Operation: At this time, if the switch SW is pressed, it switches to mode C; if the switch is not pressed, it continues to maintain the state of mode B.

[0049] Mode C (light sensing + induction mode):

[0050] Function: The induction control chip U2 outputs PWM according to the signals of the phototransistor Q1 and the passive infrared sensor. Specifically, the lamp is not on during the day, and when someone is sensed at night, the lamp is on with 100% brightness for 1 minute, and after the person leaves, the lamp is always on with 50% brightness.

[0051] Operation: At this time, if the switch is pressed, it switches to mode D; if the switch is not pressed, it continues to maintain the state of mode C.

[0052] Mode D (light sensing + induction mode):

[0053] Function: The induction control chip U2 outputs PWM according to the signals of the phototransistor Q1 and the passive infrared sensor. Specifically, the lamp is not on during the day, and when someone is sensed at night, the lamp is on with 100% brightness for 1 minute, and after the person leaves, the lamp is turned off.

[0054] Operation: At this time, if the switch is pressed, it turns off the light / end control; if the switch is not pressed, it continues to maintain the state of mode D.

[0055] Turn off the light / end:

[0056] The system returns to the initial state and waits for power supply.

[0057] When professional personnel install and debug, the state of the LED can be directly tested in the default mode, and then each mode is rotated to ensure that the installation is completed and the function is normal. When in use, the corresponding mode is set according to the needs.

[0058] In the description of the utility model, it is necessary to explain that the orientation or position relation indicated by the terms "vertical", "upper", "lower", "horizontal" and the like is the orientation or position relation based on the drawing shown, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0059] In the description of the utility model, it is also necessary to explain that, unless explicitly specified and limited, the terms "arrange", "mount", "connect", "connect" should be understood broadly, for example, can be fixedly connected, can also be detachably connected, or integrally connected; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0060] Finally, it should be pointed out that: the above only for the preferred embodiments of the utility model, and is not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing embodiments, or equivalent replacement for part of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

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 2, characterized in that: The step-down control chip U2 is MT8813S0.

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

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