Charging module and driving system for rapidly driving single-coil switch

Abstract

The utility model relates to the technical field of coil driving, in particular to a charging module and a driving system for rapidly driving a single-coil switch, which comprise a rectifier bridge circuit, a PWM (Pulse-Width Modulation) controller, an MOS (Metal Oxide Semiconductor) switching tube, a high-frequency transformer, a voltage doubling rectifying circuit and an energy storage capacitor, the rectifier bridge circuit is electrically connected with the PWM controller and a primary winding of the high-frequency transformer, the output end of the PWM controller is electrically connected with the MOS switching tube, the MOS switching tube is electrically connected with the primary winding of the high-frequency transformer, a secondary winding of the high-frequency transformer is electrically connected with the voltage doubling rectifying circuit, and the output end of the voltage doubling rectifying circuit is electrically connected with the energy storage capacitor. The high-frequency transformer plays a role in energy transmission and electrical isolation, a power supply is provided for the driving circuit through voltage stabilization of the LDO voltage stabilizer, the multiple of the output voltage can be flexibly adjusted through the voltage doubling rectifying circuit, multi-stage voltage output is carried out, and different voltage boosting requirements are met.

Description

Technical Field

[0001] The utility model relates to the technical field of coil driving, in particular to a charging module and a driving system for fast driving of a single-coil switch. Background Technique

[0002] In an electromagnetic control system, to achieve a faster mechanical action speed and improve the response performance, it is necessary to establish sufficient magnetic flux in the shortest time. The usual method is to increase the driving voltage of the coil to achieve rapid excitation and response. After increasing the driving voltage, the current will increase accordingly. Prolonged use of too high a voltage may cause overheating or damage of the coil and the driving circuit. In practical applications, effective protection of the hardware can be achieved by adjusting the voltage level in a timely manner through two-stage voltage control.

[0003] Driving a coil requires providing extremely high instantaneous energy. A capacitor has the ability to store and release energy extremely quickly. Therefore, the capacitor is pre-used for energy storage, and the energy of the capacitor is released to the coil when needed. The prior art realizes two-stage voltage energy storage and requires two power supply modules. In addition, considering issues such as safety protection, the control signal is isolated from the driving circuit, and an additional power supply needs to be provided for the driving circuit. The above problems will increase the system volume and cost, especially under the condition of limited space, which is not conducive to the compact design of the system. Content of the Utility Model

[0004] To solve the above problems, the utility model provides a charging module for fast driving of a single-coil switch, including a rectifier bridge circuit, a PWM controller, a MOS switch tube, a high-frequency transformer, a voltage doubler rectifier circuit, and an energy storage capacitor; the rectifier bridge circuit is electrically connected to the PWM controller and the primary winding of the high-frequency transformer respectively, the output end of the PWM controller is electrically connected to the MOS switch tube, the MOS switch tube is electrically connected to the primary winding of the high-frequency transformer, the secondary winding of the high-frequency transformer is electrically connected to the voltage doubler rectifier circuit, and the output end of the voltage doubler rectifier circuit is electrically connected to the energy storage capacitor.

[0005] A current-limiting resistor R1 is also connected in series between the rectifier bridge circuit and the power supply terminal of the PWM controller, and a filter capacitor C1 is connected in parallel at the series node of the rectifier bridge circuit and the current-limiting resistor R1.

[0006] To achieve multi-stage output, two voltage output terminals are provided at the output end of the voltage doubler rectifier circuit, including a first-stage voltage doubler output terminal and a second-stage voltage doubler output terminal.

[0007] The energy storage capacitor includes an energy storage capacitor CL1, an energy storage capacitor CL2, and an energy storage capacitor CL3; the first-stage voltage doubler output terminal is connected to the energy storage capacitor CL1; the second-stage voltage doubler output terminal is electrically connected to the energy storage capacitor CL2 and the energy storage capacitor CL3, and the energy storage capacitor CL2 and the energy storage capacitor CL3 are connected in series.

[0008] In the specific implementation manner, the first-stage voltage multiplier output terminal outputs a voltage of 380V, and the second-stage voltage multiplier output terminal outputs a voltage of 760V.

[0009] In order to maintain the stability of the charging voltage or current of the charging module, the charging module further includes a voltage feedback circuit, and the voltage feedback circuit is electrically connected to the energy storage capacitor and the PWM controller respectively.

[0010] The charging module further includes an LDO voltage regulator, and the LDO voltage regulator is electrically connected to the secondary winding of the high-frequency transformer.

[0011] In addition, the present application further provides a drive system, including a single-coil switch, a drive circuit, and the charging module for quickly driving the single-coil switch, and the charging module is electrically connected to the single-coil switch and the drive circuit respectively.

[0012] Beneficial effects: The present utility model is a charging module and a drive system for quickly driving a single-coil switch. By using the inverse relationship between the volume of the magnetic element and the operating frequency, the output frequency of the PWM controller is increased, the volume of the high-frequency transformer is reduced, and the volume of the charging module is further reduced. The high-frequency transformer plays a role in energy transfer and electrical isolation, and an intermediate tap is led out from the secondary winding of the high-frequency transformer, and after being regulated by the LDO voltage regulator, it provides power for the drive circuit, solving the problem in the prior art that an additional power supply needs to be provided for the drive circuit.

[0013] At the same time, the voltage multiplier rectifier circuit can multiply the input voltage, has a simpler structure, can flexibly adjust the multiple of the output voltage without changing the parameters of the high-frequency transformer, and performs multi-stage voltage output to meet different voltage boost requirements. It solves the problem in the prior art that two modules are required for two-stage voltages, and reduces the structural size of the overall system circuit. Description of the Drawings

[0014] Figure 1 is the circuit structure diagram of the charging module of the present application. Specific Implementation Manner

[0015] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings.

[0016] See Figure 1 , this embodiment provides a charging module for quickly driving a single-coil switch, including a rectifier bridge circuit, a PWM controller, a MOS switch tube Q1, a high-frequency transformer T1, a voltage multiplier rectifier circuit, and an energy storage capacitor.

[0017] Among them, the rectifier bridge circuit is electrically connected to the PWM controller and the primary winding of the high-frequency transformer T1 respectively. The input end of the rectifier bridge circuit is connected to the AC 220V power supply, and it can convert alternating current into unidirectional pulsed direct current. A current-limiting resistor R1 is also connected in series between the rectifier bridge circuit and the power supply terminal of the PWM controller. A filter capacitor C1 is connected in parallel at the series node of the rectifier bridge circuit and the current-limiting resistor R1. After the rectifier bridge circuit is connected in series and voltage-divided by the current-limiting resistor, it supplies power to the PWM controller, enabling it to work and generate PWM signals. The output end of the PWM controller is electrically connected to the MOS switch tube Q1, and the MOS switch tube Q1 is electrically connected to the primary winding of the high-frequency transformer T1. The PWM controller generates PWM signals to control the turning on and off of the MOS switch tube Q1, driving the primary winding of the high-frequency transformer T1 to work, thereby generating magnetic energy and then converting it into electrical energy and transmitting it to the secondary winding of the high-frequency transformer T1. The secondary winding of the high-frequency transformer T1 is electrically connected to a voltage multiplier rectifier circuit, and the output end of the voltage multiplier rectifier circuit is electrically connected to an energy storage capacitor. The circuit generated by the secondary winding of the high-frequency transformer T1 is subjected to voltage multiplication rectification by the voltage multiplier rectifier circuit and output to the energy storage capacitor for charging and energy storage, which is used to provide driving energy for the coil.

[0018] In order to improve the response speed of the charging module to provide the energy required by the coil, two voltage output terminals are provided at the output end of the voltage multiplier rectifier circuit, including a first-stage voltage multiplier output terminal and a second-stage voltage multiplier output terminal. The first-stage voltage multiplier output terminal outputs a voltage of 380V, and the second-stage voltage multiplier output terminal outputs a voltage of 760V. The energy storage capacitors include an energy storage capacitor CL1, an energy storage capacitor CL2, and an energy storage capacitor CL3. The first-stage voltage multiplier output terminal is connected to the energy storage capacitor CL1, which can provide a normal driving voltage for the coil; the second-stage voltage multiplier output terminal is electrically connected to the energy storage capacitor CL2 and the energy storage capacitor CL3. The energy storage capacitor CL2 and the energy storage capacitor CL3 are connected in series, and they can be quickly released when providing driving electrical energy for the coil, improving the response speed.

[0019] At the same time, in order to maintain the stability of the charging voltage or current of the charging module, the charging module also includes a voltage feedback circuit. The voltage feedback circuit is electrically connected to the energy storage capacitor and the PWM controller respectively. The voltage feedback circuit can detect the capacitor voltage of the energy storage capacitor and feedback the capacitor voltage to the PWM controller. The PWM controller performs pulse width modulation according to the feedback signal to maintain the stability of the output voltage or current. The PWM controller generates a duty cycle signal to control the switching action of the MOS switch tube Q1, and the MOS switch tube Q1 directly controls the energy transmission in the process of electric energy conversion.

[0020] In this embodiment, in order not to provide an additional power supply for the drive circuit when driving the coil, the charging module further includes an LDO voltage regulator. The LDO voltage regulator is electrically connected to the center tap of the secondary winding of the high-frequency transformer T1. The output voltage of the center tap of the secondary winding of the high-frequency transformer T1 is in a certain proportion to the main output voltage of the secondary winding. After being regulated by the LDO voltage regulator, a stable voltage signal can be output.

[0021] The charging module is connected to an AC 220V voltage. After passing through a rectifier bridge circuit and a current-limiting resistor R1, it supplies power to the PWM controller. The PWM controller starts to work and generates a PWM signal to drive the MOS switch Q1. The MOS switch Q1 further drives the primary winding of the high-frequency transformer T1 to generate magnetic energy and then convert it into electrical energy and transmit it to the secondary winding of the high-frequency transformer T1. After the output of the secondary winding of the high-frequency transformer T1 passes through a voltage multiplier rectifier circuit, two-stage voltages are output to charge and store energy in the energy storage capacitor respectively. Before the voltage of the energy storage capacitor is charged to the set voltage, the charging module charges in a constant current mode. The PWM controller detects the output current and stops output when the output current reaches the preset current. In the next oscillation cycle, the PWM controller continues to output. The voltage of the energy storage capacitor gradually rises until the voltage reaches the charging voltage, and then the charging module enters the constant voltage output mode. Through the feedback signal of the voltage feedback circuit, the PWM controller stabilizes the output voltage within the set range.

[0022] In order to realize the drive of the single-coil switch, this embodiment also provides a drive system, including a charging module, a single-coil switch, and a drive circuit. The charging module is electrically connected to the single-coil switch and the drive circuit respectively. Its LDO voltage regulator is electrically connected to the drive circuit to provide power supply. The energy storage capacitor is electrically connected to the single-coil switch. The charging module can provide three voltage levels of 12V, 380V, and 760V. The LDO voltage regulator outputs 12V voltage to provide power for the drive circuit, without the need to provide an additional power supply for the drive circuit. Moreover, the charging module receives the controller signal of the drive circuit to release the electrical energy of the energy storage capacitor. The energy storage capacitor outputs a voltage of 380V or 760V to provide the required energy for the drive excitation of the single-coil switch, realizing the fast drive of the single-coil switch.

Claims

1. A charging module for fast driving of a single-coil switch, characterized in that: It includes a rectifier bridge circuit, a PWM controller, a MOS switch tube, a high-frequency transformer, a voltage doubler rectifier circuit and an energy storage capacitor; the rectifier bridge circuit is electrically connected to the PWM controller and the primary winding of the high-frequency transformer respectively, the output end of the PWM controller is electrically connected to the MOS switch tube, the MOS switch tube is electrically connected to the primary winding of the high-frequency transformer, the secondary winding of the high-frequency transformer is electrically connected to the voltage doubler rectifier circuit, and the output end of the voltage doubler rectifier circuit is electrically connected to the energy storage capacitor.

2. The charging module for fast driving of a single-coil switch according to claim 1, characterized in that: A current limiting resistor R1 is also connected in series between the rectifier bridge circuit and the power supply end of the PWM controller, and a filter capacitor C1 is connected in parallel to the node in series between the rectifier bridge circuit and the current limiting resistor R1.

3. The charging module for fast driving of a single-coil switch according to claim 1, characterized in that: The output end of the voltage doubler rectifier circuit is provided with two-stage voltage output ends, including a primary voltage doubler output end and a secondary voltage doubler output end.

4. The charging module for fast driving of a single-coil switch according to claim 3, characterized in that: The energy storage capacitors include energy storage capacitor CL1, energy storage capacitor CL2 and energy storage capacitor CL3; The first-level voltage doubling output terminal is connected to the energy storage capacitor CL1; the second-level voltage doubling output terminal is electrically connected to the energy storage capacitor CL2 and the energy storage capacitor CL3, and the energy storage capacitor CL2 is connected in series with the energy storage capacitor CL3.

5. The charging module for fast driving of a single-coil switch according to claim 3, characterized in that: The first-level voltage doubler output terminal outputs a voltage of 380V, and the second-level voltage doubler output terminal outputs a voltage of 760V.

6. The charging module for fast driving of a single-coil switch according to claim 1, characterized in that: It also includes a voltage feedback circuit, which is electrically connected to the energy storage capacitor and the PWM controller respectively.

7. The charging module for fast driving of a single-coil switch according to claim 1, characterized in that: The invention also includes an LDO regulator, wherein the LDO regulator is electrically connected to the secondary winding of the high-frequency transformer.

8. A drive system, characterized in that: The invention comprises a single-coil switch, a driving circuit and a charging module for fast driving of the single-coil switch according to any one of claims 1 to 7, wherein the charging module is electrically connected to the single-coil switch and the driving circuit respectively.

Images