High-speed switch control circuit

Abstract

The utility model relates to the field of electronic circuits, in particular to a high-speed switch control circuit. A high-speed switch control circuit comprises a high-frequency control circuit, a constant-current output circuit, a power supply circuit and a signal input circuit. The power supply circuit comprises a chip U1 of which the model is TPS56528DDAR, the signal input circuit comprises a first connector P1 and a second connector P2, the constant current output circuit comprises a chip U3 of which the model is LM7321MFX, and the high-frequency control circuit comprises a chip U4 of which the model is TF0211E-USQ. The high-speed switch control circuit provided by the utility model can adjust PWM signals of a switch device, so that the PWM signals of the switch device can be adjusted, and the PWM signals of the switch device can be adjusted to be stable and stable. The high-speed switch control circuit can provide a stable PWM signal for an MOSFET switching device, and can work normally to control the work of external equipment.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuits, specifically a high-speed switching control circuit. Background Technology

[0002] High-speed switching control circuits are a complex and important type of circuit, possessing key characteristics such as fast response, high efficiency, and stability. They have wide applications in power electronics, energy conversion, and motor control, and continue to evolve with technological advancements. Simultaneously, the continuous emergence of new switching devices provides even more possibilities and choices for the development of high-speed switching control circuits.

[0003] High-speed switching control circuits typically employ high-speed switching devices such as MOSFETs and IGBTs. These devices possess rapid switching characteristics, enabling switching operations to be completed within nanoseconds. After the input signal is amplified, the output state of the circuit can be precisely controlled through the rapid switching of these high-speed switching devices. This rapid switching transition allows the circuit to achieve fast control of the power output, thereby realizing high-speed response and rapid switching.

[0004] The main problem with high-speed switching control circuits currently in use is that the varying rise and fall times of the high-frequency signal (PWM signal) cause waveform distortion, which affects the judgment of switching devices such as MOSFETs and IGBTs. Therefore, to solve these problems, it is necessary to continuously optimize the circuit structure and improve the reliability and stability of the circuit and the high-speed signal. Summary of the Invention

[0005] This invention addresses the problem of misjudgment of switching devices caused by variations in the rising and falling edge times of PWM signals in high-speed switching control circuits, and provides a high-speed switching control circuit.

[0006] This utility model is achieved using the following technical solution: a high-speed switching control circuit, including a high-frequency control circuit, a constant current output circuit, a power supply circuit, and a signal input circuit; the input terminal of the power supply circuit is connected to the power supply VCC, and the output terminal outputs a converted power supply; the signal input circuit includes a first connector P1 and a second connector P2, pin 1 of the first connector P1 is connected to the converted power supply output in the power supply circuit, and pin 2 is grounded; pin 1 of the second connector P2 is connected to the power supply VCC, pin 2 is grounded, and pin 3 is connected to an external PWM controller. The high-frequency control circuit includes a chip U4, model TF0211E-USQ. Pin 1 of chip U4 is connected to the power supply VCC and grounded through the thirteenth capacitor C13. A fourteenth capacitor C14 is connected in parallel across the thirteenth capacitor C13. Pins 2 and 3 are grounded. Pin 4 is connected to the output power conversion power supply in the power supply circuit through the twelfth resistor R12. Pin 4 is also connected to pin 3 of the second connector P2 in the signal input circuit. Pin 5 of chip U4 is connected through the ninth resistor R9 and the anode of the second Zener diode D2. The cathode of Zener diode D2 is connected to the emitter of transistor Q3. The base of transistor Q3 is connected to the anode of Zener diode D2. The collector of transistor Q3 is grounded. The cathode of Zener diode D2 is grounded through resistor R10. The cathode of Zener diode D2 is also connected to the gate of field-effect transistor Q2. The source of field-effect transistor Q2 is grounded. The drain is connected to one end of variable resistor VR1 through resistor R8. The drain is also connected to one end of resistor R7 and resistor R6. The other end of resistor R6 is connected to the power supply. The drain of the output power supply is connected to one end of the seventh resistor R7 and the ninth capacitor C9. The other end of the ninth capacitor C9 is grounded. One end of the ninth capacitor C9 is connected to the K terminal of the voltage reference chip. The R terminal and K terminal of the voltage reference chip are connected, and the A terminal is grounded. The other end of the sliding rheostat VR1 is grounded. The sliding terminal of the sliding rheostat VR1 is grounded through the sixteenth capacitor C16. The sliding terminal of the sliding rheostat VR1 outputs a reference signal VREF. The constant current output circuit includes a chip U3 of model LM7321MFX. Pin 3 of chip U3 is connected to the sliding end of the sliding rheostat VR1 in the high-frequency control circuit. Pin 4 is grounded through the fifteenth capacitor C15. Pin 5 is connected to the power supply VCC and is also grounded through the tenth capacitor C10. The eleventh capacitor C11 is connected in parallel across the tenth capacitor C10. Pin 2 is grounded. Pin 1 is grounded through the twelfth capacitor C12 and is connected in parallel across the thirteenth resistor R13. Pin 1 is also connected to the gate of MOSFET Q1. The source of MOSFET Q1 is connected to pin 4 of chip U3 and is also connected through the eleventh resistor R11. The drain of MOSFET Q1 is connected to the anode of the first Zener diode D1. The cathode of the first Zener diode D1 is connected to the output power supply in the power supply circuit. The anode and cathode of the first Zener diode D1 are also connected to pins 1 and 2 of the fourth connector P4, respectively. The fourth connector P4 is used to connect external devices.

[0007] A power supply VCC is provided to the power supply circuit, which then converts the VCC. A PWM signal is input to the signal input circuit. In the high-frequency control circuit, the PWM signal controls the chip U4 to output a high-speed, low-delay gate drive signal, which drives the field-effect transistor Q2 to obtain a reference signal VREF. The reference signal VREF, being a high-speed, low-delay signal, is input to the positive input terminal of the operational amplifier chip U3 in the constant current output circuit. The operational amplifier chip U3 compares the positive and negative input terminals and outputs a high-speed, low-delay gate drive signal to control the field-effect transistor Q1. The current flowing through the external device is controlled by the switching of the field-effect transistor Q1. The negative input of the operational amplifier chip U3 serves as the feedback terminal for changes in the current of the external device, while the positive input terminal serves as the control terminal for the current magnitude of the external device. Existing high-speed switching circuits are often affected by the duration of the rising and falling edges of the PWM signal during operation. This phenomenon occurs because, during continuous operation, the MOSFET is affected by its own capacitance (Ciss, Coss, Crss), causing charge accumulation and slowing down the response speed of the switching device. Therefore, this invention adds resistors and capacitors around the MOSFET. The seventh resistor R7 and the ninth capacitor C9 form a filter circuit to filter out noise interference from the power supply. The eighth resistor R8 + the sliding rheostat VR1 and the tenth resistor R10 release the charge from the MOSFET Q2. The circuit provides a channel for the field-effect transistor Q2 to quickly release its charge; the sixteenth capacitor C16 further shapes the waveform to prevent jitter or noise in the signal and further improves the stability of the output reference signal VREF; the twelfth capacitor C12 filters the output signal of the chip U3 to prevent jitter and noise in the output signal; the thirteenth resistor R13 provides a release channel for the charge accumulated in the field-effect transistor Q1, preventing the response speed of the field-effect transistor Q1 from slowing down due to charge accumulation, so that the field-effect transistor Q1 can operate normally, and thus the external device can work normally.

[0008] The high-speed switching control circuit provided by this utility model can adjust the PWM signal of the switching device, provide a stable PWM signal for the MOSFET switching device, and enable the high-speed switching control circuit to work normally and control the operation of external devices. Attached Figure Description

[0009] Figure 1 This is the circuit schematic of a high-frequency control circuit.

[0010] Figure 2 This is the circuit schematic of a constant current output circuit.

[0011] Figure 3 This is the circuit schematic of the power supply circuit.

[0012] Figure 4 This is the circuit schematic of the signal input circuit. Detailed Implementation

[0013] A high-speed switching control circuit includes a high-frequency control circuit, a constant current output circuit, a power supply circuit, and a signal input circuit.

[0014] The power supply circuit includes a chip U1, model TPS56528DDAR. Pin 8 of chip U1 is connected to the power supply VCC. Pin 8 is also grounded through a first capacitor C1. A second capacitor C2 and a third capacitor C3 are connected in parallel across capacitor C1. Pin 8 is also grounded through a second resistor R2. An eighth capacitor C8 is connected in parallel across resistor R2. Pin 1 is grounded through the eighth capacitor C8. Pin 3 is grounded through the seventeenth capacitor C17. Pin 4 is grounded through the fifth resistor R5 and the seventeenth capacitor C17. The 9th transistor... Pins 5 and 6 are grounded. Pin 2 is grounded through the fourth resistor R4 and also connected to one end of the fourth capacitor C4 through the third resistor R3. The other end of the fourth capacitor C4 is grounded. Pin 6 is connected to one end of the fourth capacitor C4 through the first inductor L1. Pin 7 is connected to pin 6 through the eighteenth capacitor C18. The seventh capacitor C7 is connected in parallel across the third resistor R3. The fifth capacitor C5 and the sixth capacitor C6 are connected in parallel across the fourth capacitor C4. One end of the fourth capacitor C4 serves as the output terminal of the power supply circuit, outputting a 5V voltage.

[0015] The signal input circuit includes a first connector P1 and a second connector P2. Pin 1 of the first connector P1 is connected to one end of the fourth capacitor C4 in the power supply circuit, and pin 2 is grounded. Pin 1 of the second connector P2 is connected to the power supply VCC, pin 2 is grounded, and pin 3 is connected to the external PWM signal.

[0016] The high-frequency control circuit includes a chip U4, model TF0211E-USQ. Pin 1 of chip U4 is connected to the power supply VCC and grounded through the thirteenth capacitor C13. A fourteenth capacitor C14 is connected in parallel across the thirteenth capacitor C13. Pin 3 is grounded. Pin 4 is connected to the 5V power supply through the twelfth resistor R12. Pin 4 is also connected to pin 3 of the second connector P2 in the signal input circuit. Pin 5 of chip U4 is connected to the anode of the second Zener diode D2 through the ninth resistor R9. The cathode of the second Zener diode D2 is connected to the emitter of transistor Q3. The base of transistor Q3 is connected to the anode of the second Zener diode D2. The collector of transistor Q3 is grounded. The cathode of the second Zener diode D2 is grounded through the tenth resistor R10. The cathode of Zener diode D2 is also connected to the gate of MOSFET Q2. The source of MOSFET Q2 is grounded. The drain is connected to one end of variable resistor VR1 through resistor R8 (eighth resistor). The drain is also connected to one end of resistor R6 (seventh resistor R7). The other end of resistor R6 is connected to a 5V power supply. The drain is also connected to one end of capacitor C9 (ninth capacitor) through resistor R7 (seventh resistor R7). The other end of capacitor C9 is grounded. One end of capacitor C9 is connected to terminal K of voltage reference chip. Terminal R and terminal K of voltage reference chip are connected, terminal A is grounded, and the other end of variable resistor VR1 is grounded. The sliding terminal of variable resistor VR1 is grounded through capacitor C16 (sixteenth capacitor). The sliding terminal of variable resistor VR1 outputs a reference signal VREF.

[0017] The constant current output circuit includes a chip U3 of model LM7321MFX. Pin 3 of chip U3 is connected to the sliding end of the sliding rheostat VR1 in the high-frequency control circuit. Pin 4 is grounded through the fifteenth capacitor C15. Pin 5 is connected to the power supply VCC and is also grounded through the tenth capacitor C10. The eleventh capacitor C11 is connected in parallel across the tenth capacitor C10. Pin 2 is grounded. Pin 1 is grounded through the twelfth capacitor C12 and is connected in parallel across the thirteenth resistor R13. Pin 1 is also connected to the gate of MOSFET Q1. The source of MOSFET Q1 is connected to pin 4 of chip U3 and is also connected through the eleventh resistor R11. The drain of MOSFET Q1 is connected to the anode of Zener diode D1. The cathode of Zener diode D1 is connected to the 5V power supply. The anode and cathode of Zener diode D1 are also connected to pins 1 and 2 of the fourth connector P4, respectively. The fourth connector P4 is used to connect external devices.

[0018] The power supply circuit is provided with a DC power supply VCC; the signal input circuit is provided with a PWM signal. The power supply circuit converts the VCC voltage to 5V (the value of VCC ranges from 4.5V to 18V).

[0019] In the high-frequency control circuit, the PWM signal control chip U4 outputs a high-speed, low-delay gate drive signal, which drives the field-effect transistor Q2 to obtain a reference signal VREF. The reference signal VREF is a high-speed, low-delay signal, which is input to the positive input terminal of the operational amplifier chip U3 in the constant current output circuit. The operational amplifier chip U3 compares the positive and negative input terminals and outputs a high-speed, low-delay gate drive signal to control the field-effect transistor Q1. The current flowing through the external device (such as a laser) is controlled by the switching of the field-effect transistor Q1. The negative input of the operational amplifier chip U3 is the feedback terminal for the change of the external device current; the positive input terminal is the control terminal for the magnitude of the external device current.

Claims

1. A high speed switch control circuit, characterized by: The application relates to a high-frequency constant-current constant-voltage power supply, which comprises a high-frequency control circuit, a constant-current output circuit, a power supply circuit and a signal input circuit; the input end of the power supply circuit is connected with a power supply VCC, and the output end outputs a converted power supply; the signal input circuit comprises a first connector P1 and a second connector P2; the 1 pin of the first connector P1 is connected with the converted power supply output in the power supply circuit, and the 2 pin is grounded; the 1 pin of the second connector P2 is connected with the power supply VCC, the 2 pin is grounded, and the 3 pin is connected with an external PWM signal; the high-frequency control circuit comprises a chip U4 with a model of TF0211E-USQ; the 1 pin of the chip U4 is connected with the power supply VCC and grounded through a thirteenth capacitor C13; the two ends of the thirteenth capacitor C13 are connected with a fourteenth capacitor C14 in parallel; the 2 pin and the 3 pin are grounded; the 4 pin is connected with the converted power supply output in the power supply circuit through a twelfth resistor R12; the 4 pin is also connected with the 3 pin of the second connector P2 in the signal input circuit; the 5 pin of the chip U4 is connected with the anode of a second zener diode D2 through a ninth resistor R9; the cathode of the second zener diode D2 is connected with the emitter of a triode Q3; the base of the triode Q3 is connected with the anode of the second zener diode D2; the collector of the triode Q3 is grounded; the cathode of the second zener diode D2 is grounded through a tenth resistor R10; the cathode of the second zener diode D2 is also connected with the gate of a field effect transistor Q2; the source of the field effect transistor Q2 is grounded; the drain is connected with one end of a slide rheostat VR1 through an eighth resistor R8; the drain is also connected with one end of a sixth resistor R6 through a seventh resistor R7; the other end of the sixth resistor R6 is connected with the converted power supply output in the power supply circuit; the drain is also connected with one end of a ninth capacitor C9 through the seventh resistor R7; the other end of the ninth capacitor C9 is grounded; one end of the ninth capacitor C9 is connected with the K end of a voltage reference chip; the R end and the K end of the voltage reference chip are connected; the A end is grounded; the other end of the slide rheostat VR1 is grounded; the slide end of the slide rheostat VR1 is grounded through a sixteenth capacitor C16; the slide end of the slide rheostat VR1 outputs a reference signal VREF; the constant-current output circuit comprises a chip U3 with a model of LM7321MFX; the 3 pin of the chip U3 is connected with the slide end of the slide rheostat VR1 in the high-frequency control circuit; the 4 pin is grounded through a fifteenth capacitor C15; the 5 pin is connected with the power supply VCC; the 5 pin is also grounded through a tenth capacitor C10; the two ends of the tenth capacitor C10 are connected with an eleventh capacitor C11 in parallel; the 2 pin is grounded; the 1 pin is grounded through a twelfth capacitor C12; the two ends of the twelfth capacitor C12 are connected with a thirteenth resistor R13 in parallel; the 1 pin is also connected with the gate of a field effect transistor Q1; the source of the field effect transistor Q1 is connected with the 4 pin of the chip U3 and also connected through an eleventh resistor R11; the drain of the field effect transistor Q1 is connected with the anode of a first zener diode D1; the cathode of the first zener diode D1 is connected with the converted power supply output in the power supply circuit; the anode and the cathode of the first zener diode D1 are also connected with the 1 pin and the 2 pin of a fourth connector P4 respectively; the fourth connector P4 is used for connecting external equipment.

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