Radar induction lamp control circuit passing new national standard harmonic waves

Abstract

The utility model discloses a radar induction lamp control circuit passing new national standard harmonic waves, which comprises an input + EMC (Electro Magnetic Compatibility) suppression device, a rectifier bridge, a linear control device, an LED (Light Emitting Diode) load, a control module and a constant-voltage power supply circuit, the linear control device and the LED load comprise a chip U1, a polar capacitor C1 and a lamp LED1. The positive electrode of the lamp LED1 is connected with a fourth pin of the chip U1 through a resistor R1 and a resistor R2. The linear control device is stable in operation, can be applied to a high-power control module which cannot be supplied with power linearly and a radar induction lamp which supplies power to an LED load for the linear control device, and can select proper resistors and capacitors to adapt to control modules with different power consumption, so that the harmonic current phase angle of the whole lamp is not influenced; therefore, the whole lamp meets the harmonic requirement of the new national standard.

Description

Technical Field

[0001] The utility model relates to the technical field of control circuits, in particular to a radar induction lamp control circuit that passes the new national standard harmonics. Background Art

[0002] At present, the radar sensing module on the market has a large power consumption and cannot be powered by a linear circuit. Most of the commonly used solutions are linear IC circuits to power LEDs, and low-power factor switching power supply constant voltage circuits to power modules. When this circuit is applied, since the radar power supply circuit is a low-power factor constant voltage circuit, there is an electrolytic capacitor and interference during EMC suppression. In a sine wave cycle of the grid voltage, the input current will charge the electrolytic capacitor near 90° of the voltage sine wave cycle, resulting in a higher convex point in the input current that fluctuates within a certain range. This phenomenon will bring an unstable factor. When this convex point is higher than the first current peak in the sine wave cycle during fluctuation, it is easy to affect the harmonic test of the whole lamp and fail the test, resulting in failure to meet the new national standard harmonic test standards. Therefore, in order to avoid the shortcomings of the prior art, it is necessary to improve the prior art. Utility Model Content

[0003] The utility model aims to overcome the shortcomings and deficiencies in the prior art and provide a radar induction lamp control circuit that passes the new national standard harmonics.

[0004] The utility model is realized by the following technical solutions:

[0005] A radar sensing lamp control circuit that passes the new national standard harmonics, including an input + EMC suppression device and a rectifier bridge, a linear control device and an LED load, a control module and a constant voltage power supply circuit, the constant voltage power supply circuit includes a chip U2 and a polarity capacitor C3, the control module includes an input interface P1, the linear control device and the LED load include a chip U1, a polarity capacitor C1 and a lamp LED1, the positive electrode of the lamp LED1 is connected to the fourth pin of the chip U1 through resistors R1 and R2, the positive electrode of the lamp LED1 is connected to the eighth pin of the chip U1 through resistor R3, and the negative electrode of the lamp LED1 is connected to the seventh pin of the chip U1. Pins, the second pin of the chip U1 is grounded through a resistor R6, and the resistor R6 is connected in parallel with a resistor R7. The third pin of the chip U1 is grounded through a resistor R8, and the resistor R8 is connected in parallel with a resistor R9. The first pin of the chip U1 is connected to the first pin of the input interface P1, and the input + EMC suppression device and the rectifier bridge are grounded through a resistor R10 and a capacitor C4. The input + EMC suppression device and the rectifier bridge are connected to the fourth pin of the chip U2 through the resistor R10. The negative electrode of the polarity capacitor C1 is connected to the fifth pin of the chip U1, and the fifth pin of the chip U2 is connected to the third pin of the input interface P1 through an inductor L3.

[0006] Further, the input + EMC suppression device and the rectifier bridge include a rectifier bridge BD1, a diode D1 and a diode D4, the linear control device and the LED load include a diode D2 and a diode D5, the output positive electrode of the rectifier bridge BD1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the positive electrode of the lamp LED1, the positive electrode of the polarity capacitor C1 is connected to the negative electrode of the diode D2, the negative electrode of the diode D1 is connected to the positive electrode of the diode D5, and the positive electrode of the polarity capacitor C1 is connected to the negative electrode of the diode D2. The positive electrode of the diode D4 is connected, the negative electrode of the diode D4 is grounded through the inductor L2, the resistor R10 and the capacitor C4, the negative electrode of the diode D4 is connected to the fourth pin of the chip U2 through the inductor L2 and the resistor R10, the input positive electrode of the rectifier bridge BD1 is connected to the L1 end of the power supply through the fuse FR1, the input positive electrode of the rectifier bridge BD1 is connected to the input negative electrode of the rectifier bridge BD1 through the safety capacitor CX1, and the input positive electrode of the rectifier bridge BD1 is connected to the input negative electrode of the rectifier bridge BD1 through the varistor VR1.

[0007] Furthermore, the inductor L2 is connected in parallel with a resistor R5.

[0008] Furthermore, the cathode of the diode D5 is connected to the cathode of the polarity capacitor C1, the cathode of the diode D5 is connected to the cathode of the diode D2 via the resistor R4, and the anode of the diode D5 is grounded.

[0009] Furthermore, the ninth pin of the chip U1 is grounded, the second pin of the chip U2 is grounded, and the second pin of the input interface P1 is grounded.

[0010] Furthermore, the first pin of the chip U2 is connected to the third pin of the input interface P1.

[0011] Furthermore, the fifth pin of the chip U2 is connected to the eighth pin of the chip U2 via the capacitor C2.

[0012] Furthermore, the third pin of the input interface P1 is grounded through a resistor R11, the third pin of the input interface P1 is connected to the positive electrode of the polarity capacitor C3, and the negative electrode of the polarity capacitor C3 is grounded.

[0013] Furthermore, the model of the chip U1 is SM2189EM.

[0014] Furthermore, the model of the chip U2 is SDH7251S.

[0015] Compared with the prior art, the utility model connects the positive electrode of the lamp LED1 to the fourth pin of the chip U1 through the resistor R1 and the resistor R2, the positive electrode of the lamp LED1 is connected to the eighth pin of the chip U1 through the resistor R3, the negative electrode of the lamp LED1 is connected to the seventh pin of the chip U1, the second pin of the chip U1 is grounded through the resistor R6, the resistor R6 is connected in parallel with the resistor R7, the third pin of the chip U1 is grounded through the resistor R8, the resistor R8 is connected in parallel with the resistor R9, the first pin of the chip U1 is connected to the first pin of the input interface P1, the input +EMC suppression device and the rectifier bridge are grounded through the resistor R10 and the capacitor C4, the input +EMC suppression device and the rectifier bridge are connected through the resistor R10 The fourth pin of the chip U2 and the negative pole of the polar capacitor C1 are connected to the fifth pin of the chip U1. The fifth pin of the chip U2 is connected to the third pin of the input interface P1 through the inductor L3. When working, the input +EMC suppression device and the rectifier bridge process the input AC mains to make it conform to the DC power of the national EMC standard. By adjusting the parameters of the polar capacitor C1, the resistor R1, the resistor R2, the resistor R3, the resistor R6, the resistor R7, the resistor R8, and the resistor R9, the charging current and phase angle of the polar capacitor C1 of the chip U1 are controlled, so as to adjust the input current within 60° within one input sine wave cycle, reach the maximum value within 65°, and be greater than 5% at 90°, so as to conform to GB 17625.1-2022 Regarding clause 7.4.3 of the harmonic test, the constant voltage power supply circuit processes the DC power so that the output DC power meets the requirements for use by the control module. According to the power size of the control module, the parameters of the resistor R10 and the capacitor C4 are adjusted to control the current size and time of charging the capacitor C4 during the entire sine wave cycle, so that it does not affect the harmonic current phase angle of the entire lamp, and meets the test standards of the new national standard harmonics. It can be applied to radar sensing lamps that cannot be powered by linear power control modules with higher power and use linear control devices to power LED loads. Appropriate resistors and capacitors can be selected to adapt to control modules with different power consumption, so that it does not affect the harmonic current phase angle of the entire lamp, so that the entire lamp meets the harmonic requirements of the new national standard GB 17625.1-2022. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is the control principle diagram of the radar induction lamp control circuit that passes the new national standard harmonics of the utility model;

[0018] Figure 2 This is the circuit schematic diagram of the radar sensing lamp control circuit that passes the new national standard harmonics of the utility model;

[0019] Figure 3 This is the new national standard harmonic test diagram of the radar sensing lamp control circuit that passes the new national standard harmonics of the utility model.

[0020] In the figure: A-input + EMC suppression device and rectifier bridge; B-linear control device and LED load; C-control module; D-constant voltage power supply circuit. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figures 1 to 3The utility model is a radar sensing lamp control circuit that passes the new national standard harmonics, including an input + EMC suppression device and a rectifier bridge A, a linear control device and an LED load B, a control module C and a constant voltage power supply circuit D, the constant voltage power supply circuit D includes a chip U2 and a polarity capacitor C3, the control module C includes an input interface P1, the linear control device and the LED load B include a chip U1, a polarity capacitor C1 and a lamp LED1, the positive electrode of the lamp LED1 is connected to the fourth pin of the chip U1 through resistors R1 and R2, the positive electrode of the lamp LED1 is connected to the eighth pin of the chip U1 through resistor R3, and the negative electrode of the lamp LED1 is connected to the eighth pin of the chip U1 through resistor R3. The seventh pin of the chip U1 is connected to the polarity, the second pin of the chip U1 is grounded through a resistor R6, and the resistor R6 is connected in parallel with a resistor R7. The third pin of the chip U1 is grounded through a resistor R8, and the resistor R8 is connected in parallel with a resistor R9. The first pin of the chip U1 is connected to the first pin of the input interface P1, the input +EMC suppression device and the rectifier bridge A are grounded through a resistor R10 and a capacitor C4, the input +EMC suppression device and the rectifier bridge A are connected to the fourth pin of the chip U2 through the resistor R10, the negative pole of the polarity capacitor C1 is connected to the fifth pin of the chip U1, and the fifth pin of the chip U2 is connected to the third pin of the input interface P1 through the inductor L3. When working, the input +EMC suppression device and the rectifier bridge A process the input AC mains to make it conform to the national EMC standard DC, and improve the anti-lightning surge capability of the lamp. By adjusting the parameters of the polarity capacitor C1, resistor R1, resistor R2, resistor R3, resistor R6, resistor R7, resistor R8, and resistor R9, the charging current and phase angle of the polarity capacitor C1 controlled by the control chip U1 are adjusted, so that the input current is turned on within 60°, reaches the maximum value within 65°, and is greater than 5% at 90° within an input sine wave cycle, thereby meeting GB 17625.1-2022 Regarding clause 7.4.3 in the harmonic test, the constant voltage power supply circuit D processes the DC power so that the output DC power meets the requirements for use by the control module. According to the power size of the control module, the parameters of the resistor R10 and the capacitor C4 are adjusted to control the current size and time of charging the capacitor C4 during the entire sinusoidal wave cycle, so that it does not affect the harmonic current phase angle of the entire lamp, and meets the test standards of the new national standard harmonics. It can be applied to radar sensing lamps that cannot be powered by linear power control modules with higher power and use linear control devices to power LED loads. Appropriate resistors and capacitors can be selected to adapt to control modules with different power consumption, so that it does not affect the harmonic current phase angle of the entire lamp, so that the entire lamp meets the harmonic requirements of the new national standard GB 17625.1-2022.

[0023] The input + EMC suppression device and the rectifier bridge A include a rectifier bridge BD1, a diode D1 and a diode D4, the linear control device and the LED load B include a diode D2 and a diode D5, the output positive electrode of the rectifier bridge BD1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the positive electrode of the lamp LED1, the positive electrode of the polarity capacitor C1 is connected to the negative electrode of the diode D2, the negative electrode of the diode D1 is connected to the positive electrode of the diode D4, the negative electrode of the diode D4 is grounded through the inductor L2, the resistor R10 and the capacitor C4, and the negative electrode of the diode D4 is connected to the fourth pin of the chip U2 through the inductor L2 and the resistor R10. The positive input pole of the rectifier bridge BD1 is connected to the L1 end of the power supply through the fuse FR1, and the positive input pole of the rectifier bridge BD1 is connected to the negative input pole of the rectifier bridge BD1 through the safety capacitor CX1, and the positive input pole of the rectifier bridge BD1 is connected to the negative input pole of the rectifier bridge BD1 through the varistor VR1, so as to improve the stability and safety of the current input and voltage input, and enhance the lightning surge resistance of the lamp. The diode D1, the diode D2, and the diode D4 isolate the constant voltage power supply and the linear control so that they do not affect each other during normal operation. The input +EMC suppression device, the rectifier bridge A, the linear control device, and the LED load B process the DC power to supply power to the lamp LED1, and comply with the 7.4.3 clause in the harmonic test of GB 17625.1-2022.

[0024] The inductor L2 is connected in parallel with a resistor R5 to improve the control accuracy of the current and effectively suppress electromagnetic interference (EMI) and surge current.

[0025] The cathode of the diode D5 is connected to the cathode of the polarity capacitor C1, the cathode of the diode D5 is connected to the cathode of the diode D2 through the resistor R4, and the anode of the diode D5 is grounded, which effectively ensures the stability and safety of the input current.

[0026] The ninth pin of the chip U1 is grounded, the second pin of the chip U2 is grounded, and the second pin of the input interface P1 is grounded, thereby improving the working safety of the control circuit.

[0027] The first pin of the chip U2 is connected to the third pin of the input interface P1 , and the chip U2 directly outputs voltage and current to the input interface P1 for use.

[0028] The fifth pin of the chip U2 is connected to the eighth pin of the chip U2 through the capacitor C2 to ensure the working stability of the chip U2.

[0029] The third pin of the input interface P1 is grounded through the resistor R11, the third pin of the input interface P1 is connected to the positive electrode of the polarity capacitor C3, and the negative electrode of the polarity capacitor C3 is grounded, so as to ensure the stability and safety of the output voltage and current of the chip U2.

[0030] As a specific implementation, the model of chip U1 is SM2189EM.

[0031] As a specific implementation, the model of the chip U2 is SDH7251S.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A radar sensing lamp control circuit that passes the new national standard harmonics, characterized by: It includes an input + EMC suppression device and a rectifier bridge, a linear control device and an LED load, a control module and a constant voltage power supply circuit, the constant voltage power supply circuit includes a chip U2 and a polarity capacitor C3, the control module includes an input interface P1, the linear control device and the LED load include a chip U1, a polarity capacitor C1 and a lamp LED1, the positive electrode of the lamp LED1 is connected to the fourth pin of the chip U1 through resistors R1 and R2, the positive electrode of the lamp LED1 is connected to the eighth pin of the chip U1 through resistor R3, the negative electrode of the lamp LED1 is connected to the seventh pin of the chip U1, and the positive electrode of the lamp LED1 is connected to the eighth pin of the chip U1 through resistor R3. The second pin is grounded through a resistor R6, and the resistor R6 is connected in parallel with a resistor R7. The third pin of the chip U1 is grounded through a resistor R8, and the resistor R8 is connected in parallel with a resistor R9. The first pin of the chip U1 is connected to the first pin of the input interface P1. The input +EMC suppression device and the rectifier bridge are grounded through a resistor R10 and a capacitor C4. The input +EMC suppression device and the rectifier bridge are connected to the fourth pin of the chip U2 through the resistor R10. The negative electrode of the polarity capacitor C1 is connected to the fifth pin of the chip U1, and the fifth pin of the chip U2 is connected to the third pin of the input interface P1 through an inductor L3.

2. The radar sensing lamp control circuit that passes the new national standard harmonic according to claim 1 is characterized in that: The input + EMC suppression device and the rectifier bridge include a rectifier bridge BD1, a diode D1 and a diode D4, the linear control device and the LED load include a diode D2 and a diode D5, the output positive electrode of the rectifier bridge BD1 is connected to the positive electrode of the diode D1, the negative electrode of the diode D1 is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the positive electrode of the lamp LED1, the positive electrode of the polarity capacitor C1 is connected to the negative electrode of the diode D2, the negative electrode of the diode D1 is connected to the positive electrode of the diode D5, and the positive electrode of the polarity capacitor C1 is connected to the negative electrode of the diode D2. 4, the cathode of the diode D4 is grounded through the inductor L2, the resistor R10 and the capacitor C4, the cathode of the diode D4 is connected to the fourth pin of the chip U2 through the inductor L2 and the resistor R10, the input anode of the rectifier bridge BD1 is connected to the L1 end of the power supply through the fuse FR1, the input anode of the rectifier bridge BD1 is connected to the input cathode of the rectifier bridge BD1 through the safety capacitor CX1, and the input anode of the rectifier bridge BD1 is connected to the input cathode of the rectifier bridge BD1 through the varistor VR1.

3. The radar sensing lamp control circuit that passes the new national standard harmonic according to claim 2 is characterized in that: The inductor L2 is connected in parallel with a resistor R5.

4. The radar sensing lamp control circuit that passes the new national standard harmonic according to claim 2 is characterized in that: The cathode of the diode D5 is connected to the cathode of the polarity capacitor C1 , the cathode of the diode D5 is connected to the cathode of the diode D2 via the resistor R4 , and the anode of the diode D5 is grounded.

5. The radar sensing lamp control circuit that passes the new national standard harmonic according to claim 1 is characterized in that: The ninth pin of the chip U1 is grounded, the second pin of the chip U2 is grounded, and the second pin of the input interface P1 is grounded.

6. The radar sensing lamp control circuit that passes the new national standard harmonic according to claim 1 is characterized in that: The first pin of the chip U2 is connected to the third pin of the input interface P1.

7. The radar sensing lamp control circuit that passes the new national standard harmonic according to claim 1 is characterized in that: The fifth pin of the chip U2 is connected to the eighth pin of the chip U2 via the capacitor C2.

8. The radar sensing lamp control circuit that passes the new national standard harmonic according to claim 1 is characterized in that: The third pin of the input interface P1 is grounded through a resistor R11 , the third pin of the input interface P1 is connected to the positive electrode of the polarity capacitor C3 , and the negative electrode of the polarity capacitor C3 is grounded.

9. The radar sensing lamp control circuit that passes the new national standard harmonic according to claim 1 is characterized in that: The model of the chip U1 is SM2189EM.

10. The radar sensing lamp control circuit that passes the new national standard harmonic according to claim 1 is characterized in that: The model of the chip U2 is SDH7251S.

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