Drive circuit and power supply equipment

Abstract

The present application proposes a driving circuit and a power supply device, which relate to the field of power electronics technology. The driving circuit is applied to drive a relay, and the driving circuit includes: a first switch tube, which is connected to a relay; a pull-in control circuit, the input end of the pull-in control circuit is used to receive a first drive signal, and the output end of the pull-in control circuit is connected to the control end of the first switch tube; a holding control circuit, the first input end of the holding control circuit is used to receive the first drive signal, the second input end of the holding control circuit is used to receive the second drive signal, and the output end of the holding control circuit is connected to the control end of the first switch tube. The present application solves the problem in the related art that it is difficult to simultaneously ensure the contact pull-in stability and low power consumption of the relay.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a drive circuit and a power supply device. Background Art

[0002] With the development of new energy vehicle charging pile technology, the output voltage range of power supply equipment is getting wider and wider. In order to meet the output of a wide voltage range, it is necessary to use series and parallel connection of relays.

[0003] In the related art, the coil impedance of a high-power relay is relatively small, and the difference between the contact action voltage and the holding voltage of the relay is relatively large. If the pull-in voltage is maintained all the time, the relay will heat up seriously and consume a lot of power. If the holding voltage is used, the relay contacts will not be able to be fully pulled in. It is difficult to ensure the contact pull-in stability and low power consumption of the relay at the same time. Summary of the invention

[0004] The present application aims to solve the problem existing in the prior art or related art that it is difficult to simultaneously ensure the contact closure stability and low power consumption of the relay.

[0005] To this end, a first aspect of the present application provides a driving circuit.

[0006] A second aspect of the present application provides a power supply device.

[0007] In view of this, according to the first aspect of the present application, a driving circuit is proposed, which is used to drive a relay, and the driving circuit includes: a first switch tube, the first switch tube is connected to the relay; an attraction control circuit, the input end of the attraction control circuit is used to receive a first drive signal, the output end of the attraction control circuit is connected to the control end of the first switch tube, and the attraction control circuit is used to stop transmitting the first drive signal after the first drive signal is transmitted to the first switch tube for a preset time; a holding control circuit, the first input end of the holding control circuit is used to receive the first drive signal, the second input end of the holding control circuit is used to receive the second drive signal, the output end of the holding control circuit is connected to the control end of the first switch tube, and the holding control circuit is used to respond to the first drive signal and transmit the second drive signal to the control end of the first switch tube; wherein the first drive signal is used to drive the first switch tube to turn on so that the relay is in an attraction state, and the second drive signal is used to drive the first switch tube to switch between an on state and an off state so that the relay is in a holding state.

[0008] In this technical solution, the driving circuit is used to drive whether the contacts of the relay are in the energized state. A first switch tube is provided in the driving circuit. The first switch tube is connected to the relay. The on-off state of the first switch tube can control whether the relay coil is powered normally, thereby driving whether the contacts of the relay are energized.

[0009] Specifically, when the first switch tube is in the on state, the relay coil is normally powered on, and the contacts of the relay are in the closed state. When the first switch tube is in the off state, the relay coil stops being powered on, and the contacts of the relay are in the off state.

[0010] In this technical solution, a pull-in control circuit and a holding control circuit are provided in the driving circuit. The input end of the pull-in control circuit is used to receive a first drive signal, and the output end of the pull-in control circuit is used to receive the first drive signal to the control end of the first switch tube, and the first drive signal is used to control the first switch tube to maintain the on state. After the first switch tube maintains the on state, the first drive signal is stopped from being transmitted to the first control end. The first input end of the holding control circuit is used to receive the first drive signal, and the second input end of the holding control circuit is used to receive the second drive signal, and the holding control circuit can respond to the first drive signal and transmit the second drive signal to the control end of the first switch tube. It should be noted that the second drive signal is a PWM (Pulse Width Modulation) signal, and the first drive signal is a high-level signal. When the pull-in control circuit and the holding control circuit are both in the running state, the first drive signal and the second drive signal are synchronously transmitted to the control end of the first switch tube, and at this time, only the first drive signal acts on the control end of the first switch tube to keep the first switch tube in the on state. When the pull-in control circuit stops transmitting the first drive signal to the control end of the first switch tube, only the second drive signal of the control circuit is able to be transmitted to the control end of the first switch tube. At this time, since the second drive signal is a PWM signal, the first switch tube switches between the on state and the off state.

[0011] Specifically, when the first drive signal is a high-level signal, the control end of the first switch tube first receives the first drive signal from the pull-in control circuit. At this time, the first switch tube is in the on state, and the relay performs the contact pull-in action. After the control end of the first switch tube receives the first drive signal, the control end of the first switch tube stops receiving the first drive signal, and responds to the second drive signal of the holding control circuit, switches between the on state and the off state, and the relay switches to the contact holding state after completing the contact pull-in action. When the first drive signal is a low-level signal, the first switch tube will not receive the first drive signal and the second drive signal. At this time, the first switch tube remains in the off state, that is, the relay maintains the contact disconnected state.

[0012] In the technical solution of the present application, a first switch tube connected to the relay is provided in the driving circuit of the relay, and the power-on state of the relay can be controlled by controlling the on-off state of the first switch tube, and a pull-in control circuit and a holding control circuit are provided in the driving circuit of the relay. The pull-in control circuit can transmit a first drive signal to the control end of the first switch tube to drive the first switch tube to remain on, and automatically stop transmitting the first drive signal to the control end of the first switch tube. The holding control circuit can transmit a second drive signal to the control end of the first switch tube to drive the first switch tube to switch the on state, so that the first switch tube starts to switch between the on state and the off state after maintaining the on state, so that the relay enters the pull-in holding state after completing the pull-in action, reducing the loss of the relay coil, reducing the temperature rise of the relay, improving the efficiency of the system power supply, and ensuring the pull-in stability of the relay in the pull-in holding stage, solving the problem in the related art that it is difficult to simultaneously ensure the contact pull-in stability and low power consumption of the relay.

[0013] In some technical schemes, optionally, the pull-in control circuit includes: a second switch tube, the first end of the second switch tube is used to receive the first drive signal; a first diode, the positive electrode of the first diode is connected to the second end of the second switch tube, and the negative electrode of the first diode is used to transmit the first drive signal to the control end of the first switch tube; a first capacitor, the first end of the first capacitor is connected to the third end of the second switch tube, and the second end of the first capacitor is grounded; a first resistor, the first end of the first resistor is used to receive the first drive signal, and the second end of the first resistor is used to transmit the first drive signal to the first capacitor to charge the first capacitor.

[0014] In this technical solution, the pull-in control circuit includes a second switch tube, a first diode, a first resistor and a first capacitor. The first end of the second switch tube is used to receive a first drive signal, and the second end of the second switch tube is used to transmit the first drive signal to the control end of the first switch tube. The first diode is connected between the second end of the second switch tube and the control end of the first switch tube, so that the first drive signal is transmitted unidirectionally to the control end of the first switch tube. The first capacitor is connected between the control end of the second switch tube and the ground end, the second end of the first resistor is connected between the first capacitor and the ground end, the first end of the first resistor is used to receive the first drive signal, and the first capacitor and the first resistor form a delayed closing module. After the first drive signal is a high-level signal for a preset time, the second switch tube is controlled to switch from the on state to the off state, thereby controlling the control end of the first switch tube to switch from receiving the first drive signal to receiving the second drive signal from the holding control circuit.

[0015] Specifically, the input end of the pull-in control circuit includes a first input end and a second input end. The first input end of the pull-in control circuit is the first end of the second switch tube, the second input end of the pull-in control circuit is the first end of the first resistor, and the output end of the pull-in control circuit is the cathode of the first diode.

[0016] In the technical solution of the present application, a second switch tube and a first diode for transmitting a first drive signal are provided in the pull-in control circuit, so that when the second switch tube is turned on, the first drive signal can be stably transmitted to the control end of the first switch tube, and a first capacitor and a first resistor for controlling the delayed shutdown of the second switch tube are also provided in the pull-in control circuit, so that the second switch tube can be automatically turned off after being turned on for a preset period of time, so that the control end of the first switch tube can automatically switch to receiving the second drive signal after receiving the first drive signal for a preset period of time.

[0017] In some technical solutions, optionally, after the first switch tube transmits the first drive signal for a preset time period, it stops transmitting the first drive signal; wherein the preset time period is associated with a charging time constant of the first capacitor and the first resistor.

[0018] In this technical solution, the preset duration for the pull-in control circuit to transmit the first drive signal to the control end of the first switch tube is related to the charging time constant of the first capacitor and the first resistor. According to actual needs, the charging time constant of the first capacitor and the first resistor can be set, and the preset duration for the pull-in control circuit to output the first drive signal can be set.

[0019] Specifically, when the first drive signal is a high-level signal, the control end of the first switch tube first receives the first drive signal from the pull-in control circuit. At this time, the first switch tube is in the on state, and the relay performs the contact pull-in action. After the control end of the first switch tube receives the first drive signal for a preset time, the control end of the first switch tube stops receiving the first drive signal, and responds to the second drive signal of the holding control circuit, switches between the on state and the off state, and the relay switches to the contact holding state after completing the contact pull-in action. When the first drive signal is a low-level signal, the first switch tube will not receive the first drive signal and the second drive signal. At this time, the first switch tube remains in the off state, that is, the relay maintains the contact disconnected state.

[0020] In some technical schemes, optionally, the maintenance control circuit includes: a third switch tube, the first end of the third switch tube is used to receive the second drive signal, and the third end of the third switch tube is used to receive the first drive signal; a second diode, the first end of the second diode is connected to the second end of the third switch tube, and the second end of the second diode is used to transmit the second drive signal to the control end of the first switch tube.

[0021] In this technical solution, the holding control circuit includes a third switch tube and a second diode, the first end of the third switch tube is used to receive the second drive signal, the second end of the third switch tube is used to output the second drive signal, the control end of the third switch tube is used to receive the first drive signal, and the on-off state from the first end to the second end of the third switch tube is controlled by the high and low level state of the first drive signal. The second diode is connected between the second end of the third switch tube and the control end of the first switch tube, so that the second drive signal is transmitted unidirectionally to the control end of the first switch tube.

[0022] When the first drive signal is a high level signal, the first end to the second end of the third switch tube is in a conducting state, and at this time, the second drive signal can be transmitted to the control end of the first switch tube through the third switch tube. When the first drive signal is a low level signal, the first end to the second end of the third switch tube is in a cut-off state, and at this time, the second drive signal cannot be transmitted to the control end of the first switch tube through the third switch tube.

[0023] Specifically, the second end of the third switch tube is the output end of the holding control circuit, the first end of the third switch tube is the second input end of the holding control circuit, and the second end of the third switch tube is the first input end of the holding control circuit.

[0024] In the technical solution of the present application, a third switch tube is arranged in the holding control circuit, and the first end and the second end of the third switch tube are respectively used to receive and output the second drive signal, and the control end of the third switch tube is used to receive the first drive signal, so that the third switch tube can be controlled by the first drive signal to switch the on-off state, thereby improving the on-off action speed of the relay contacts.

[0025] In some technical schemes, optionally, the maintenance control circuit also includes: a second resistor, the first end of the second resistor is used to receive the first drive signal, and the second end of the second resistor is connected to the third end of the third switch tube; a third resistor, the first end of the third resistor is connected to the second end of the second resistor, and the second end of the third resistor is connected to the second end of the third switch tube.

[0026] In the technical solution of the present application, the holding control circuit includes a second resistor and a third resistor, and the second resistor and the third resistor are used to drive the third switch tube. By setting the second resistor and the third resistor in the holding control circuit, the first drive signal can be transmitted to the control end of the third switch tube, thereby driving the third switch tube.

[0027] In some technical solutions, optionally, the driving circuit also includes: the relay includes a relay coil, a first end of the relay coil is connected to the power supply, a second end of the relay coil is connected to the first end of the first switch tube, and a second end of the first switch tube is grounded.

[0028] In the technical solution of the present application, a relay is provided in the relay, and when the relay coil is powered on, the contacts of the relay can be driven to be in a closed state under the action of magnetic force. The relay coil and the first switch tube are connected in series between the power supply and the ground terminal. By controlling the on-off state of the first switch tube, it is possible to switch whether the relay coil is connected to the power supply, thereby controlling whether the relay coil is powered on.

[0029] Specifically, the relay coil is connected between the power supply and the first switch tube, the first end of the first switch tube is connected to the relay coil, and the second end of the first switch tube is grounded.

[0030] In some technical schemes, optionally, the driving circuit also includes: a fourth resistor, a first end of the fourth resistor is connected to the control end of the first switch tube, and a second end of the fourth resistor is connected to the output end of the pull-in control circuit and the output end of the holding control circuit; a fifth resistor, a first end of the fifth resistor is connected to the first end of the fourth resistor, and a second end of the fifth resistor is grounded.

[0031] In the technical solution of the present application, the fourth resistor and the fifth resistor are driving resistors of the first switch tube, and the second resistor and the third resistor are used to drive the first switch tube. By setting the second resistor and the third resistor in the driving circuit, the first driving signal and the second driving signal can be transmitted to the control end of the first switch tube, thereby driving the first switch tube.

[0032] In some technical schemes, optionally, the driving circuit also includes: a Zener diode, the positive electrode of which is connected to the first end of the first switching tube, and the second end of the first switching tube is grounded; a third diode, the positive electrode of the third diode is connected to the negative electrode of the Zener diode, and the negative electrode of the third diode is connected to the power supply.

[0033] In this technical solution, a series-connected voltage regulator and a third diode are also provided in the driving circuit, wherein the relay coil is connected in reverse parallel to the third diode and the voltage regulator. The relay coil is an inductor coil, which stores a certain amount of energy when the relay coil is powered on. When the relay coil voltage is disconnected, the energy in the relay coil is released through the reverse-parallel third diode and the voltage regulator discharge circuit to ensure reliable disconnection of the relay contacts.

[0034] Specifically, when the second drive signal is transmitted to the first switch tube, the first switch tube switches between the on state and the off state. When the first switch tube is turned off, the voltage of the relay coil is reversed. The energy when the relay coil is turned on is discharged through the third diode and the voltage regulator tube, ensuring that the relay contacts can be reliably opened when the first switch tube is turned on next time.

[0035] In the technical solution of the present application, a third diode and a voltage regulator tube are arranged in the driving circuit in reverse parallel with the relay coil, so as to discharge part of the energy stored in the relay coil, thereby ensuring the accuracy and flexibility of switching the on-off state of the relay contacts.

[0036] In some technical solutions, optionally, the driving circuit further includes: a second capacitor, a first end of the second capacitor is connected to the cathode of the third diode, and a second end of the second capacitor is connected to the second end of the first switch tube.

[0037] In this embodiment, a second capacitor is further provided in the driving circuit. The second capacitor is connected in parallel with the third diode, the voltage regulator and the first switch tube connected in series. The first end of the second capacitor is connected to the negative electrode of the third diode, that is, the first end of the second capacitor is connected to the power supply, and the second end of the second capacitor is connected to the second end of the first switch tube, that is, the second end of the second capacitor is grounded.

[0038] In an embodiment of the present application, a second capacitor connected in parallel with the first switch tube is provided in the driving circuit. When the first switch tube is turned off, the voltage of the relay coil is reversed. When the relay coil is turned on, the energy is discharged to the second capacitor through the third diode and the voltage regulator tube. The second capacitor can play the role of energy storage and filtering in the driving circuit, thereby further improving the stability of the driving circuit in driving the relay.

[0039] In some technical solutions, optionally, the driving circuit further includes: a signal chip, a power supply pin of the signal chip is connected to the power supply, and a signal output pin of the signal chip is connected to the second input terminal of the holding control circuit.

[0040] In the technical solution of the present application, the signal chip is used to transmit a second drive signal to the second input end of the maintenance control circuit when powered on. By separately setting up a signal chip for outputting the second drive signal, the PWM control pins and ordinary input and output pins of the controller can be saved, thereby reducing the occupancy of the controller's communication resources.

[0041] In some technical solutions, optionally, the driving circuit also includes: a controller, a signal output end of the controller is connected to the input end of the pull-in control circuit, and the signal output end of the controller is connected to the first input end of the holding control circuit.

[0042] In the technical solution of the present application, the controller in the driving circuit is used to output a first driving signal, the first driving signal is transmitted to the pull-in control circuit so that the pull-in control circuit transmits the first driving signal to the first switching tube, and the first driving signal is transmitted to the holding control circuit so that the holding control circuit transmits the second driving signal to the first switching tube.

[0043] According to the second aspect of the present application, a power supply device is proposed, including: a relay, the relay including a relay coil; a driving circuit in any of the above technical solutions, the first switching tube in the driving circuit is connected to the relay coil; and thus has all the beneficial technical effects of the driving circuit in any of the above technical solutions, which will not be repeated here.

[0044] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0046] Figure 1 One of the circuit topology diagrams of a driving circuit provided in some embodiments of the present application is shown;

[0047] Figure 2 shows a driving timing diagram of a relay provided in some embodiments of the present application;

[0048] Figure 3 A functional block diagram of a driving circuit provided in some embodiments of the present application is shown;

[0049] Figure 4 A structural block diagram of a power supply device is shown in some embodiments of the present application.

[0050] Figure 1 The reference numerals in the figures are as follows:

[0051] 100 driving circuit, 402 relay, 101 pull-in control circuit, 102 holding control circuit, 103 controller, L relay coil, V power supply, Q1 first switch tube, Q2 second switch tube, Q3 third switch tube, D1 first diode, D2 second diode, D3 third diode, C1 first capacitor, C2 second capacitor, C3 third capacitor, C4 fourth capacitor, C5 fifth capacitor, C6 sixth capacitor, C7 seventh capacitor, R1 first resistor, R2 second resistor, R3 third resistor, R4 fourth resistor, R5 fifth resistor, R6 sixth resistor, R7 seventh resistor, ZD voltage regulator, U1 signal chip, GND grounding terminal. DETAILED DESCRIPTION

[0052] In order to more clearly understand the above-mentioned objectives, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, in the absence of conflict, the present embodiment and the features in the embodiment can be combined with each other.

[0053] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0054] Refer to the following Figures 1 to 4 A driving circuit and a power supply device according to some embodiments of the present application are described.

[0055] According to one embodiment of the present application, Figure 1 A circuit topology diagram of a driving circuit provided in some embodiments of the present application is shown, such as Figure 1 As shown, a driving circuit 100 is proposed, which is applied to drive a relay 402. The driving circuit 100 includes: a first switch tube Q1, the first switch tube Q1 is connected to the relay; a pull-in control circuit, the input end of the pull-in control circuit is used to receive a first drive signal, the output end of the pull-in control circuit is connected to the control end of the first switch tube Q1, and the pull-in control circuit is used to stop transmitting the first drive signal after transmitting the first drive signal to the first switch tube Q1; a holding control circuit, the first input end of the holding control circuit is used to receive the first drive signal, the second input end of the holding control circuit is used to receive the second drive signal, the output end of the holding control circuit is connected to the control end of the first switch tube Q1, and the holding control circuit is used to respond to the first drive signal and transmit the second drive signal to the control end of the first switch tube Q1; wherein the first drive signal is used to drive the first switch tube Q1 to turn on, so that the relay 402 is in the pull-in state, and the second drive signal is used to drive the first switch tube Q1 to switch between the on state and the off state, so that the relay 402 is in the holding state.

[0056] In this embodiment, the driving circuit 100 is used to drive whether the contacts of the relay 402 are in an energized state. A first switch tube Q1 is provided in the driving circuit 100. The first switch tube Q1 is connected to the relay. The on-off state of the first switch tube Q1 can control whether the relay 402 is powered on normally, thereby driving whether the contacts of the relay 402 are energized.

[0057] Exemplarily, the power source V to which the relay coil L is connected is a +12V power source.

[0058] Specifically, when the first switch tube Q1 is in the on state, the relay 402 is normally powered on, and the contact of the relay 402 is in the energized state. When the first switch tube Q1 is in the off state, the relay coil L stops being powered on, and the contact of the relay 402 is in the off state.

[0059] Exemplarily, the first switch tube Q1 is selected as a MOS (Metal-Oxide-Semiconductor, metal-oxide semiconductor field effect transistor) tube, the D (drain) electrode of the MOS tube is electrically connected to the first end of the relay coil L, the S (source) electrode of the MOS tube is electrically connected to the second end of the relay 402, and the G (gate) electrode of the MOS tube is used to receive the first drive signal or the second drive signal.

[0060] In this embodiment, a pull-in control circuit and a holding control circuit are provided in the driving circuit 100. The input end of the pull-in control circuit is used to receive a first drive signal, and the output end of the pull-in control circuit is used to receive the first drive signal to the control end of the first switch tube Q1, and the first drive signal is used to control the first switch tube Q1 to maintain the on state. After the first switch tube Q1 maintains the on state, the first drive signal is stopped from being transmitted to the first control end. The first input end of the holding control circuit is used to receive the first drive signal, and the second input end of the holding control circuit is used to receive the second drive signal, and the holding control circuit can respond to the first drive signal and transmit the second drive signal to the control end of the first switch tube Q1. It should be noted that the second drive signal is a PWM (Pulse Width Modulation) signal, and the first drive signal is a high-level signal. When both the pull-in control circuit and the holding control circuit are in the running state, the first drive signal and the second drive signal are synchronously transmitted to the control end of the first switch tube Q1. At this time, only the first drive signal acts on the control end of the first switch tube Q1, so that the first switch tube Q1 remains in the on state. When the pull-in control circuit stops transmitting the first drive signal to the control end of the first switch tube Q1, only the second drive signal of the control circuit is transmitted to the control end of the first switch tube Q1. At this time, since the second drive signal is a PWM signal, the first switch tube Q1 switches between the on state and the off state.

[0061] Specifically, when the first drive signal is a high-level signal, the control end of the first switch tube Q1 first receives the first drive signal from the pull-in control circuit. At this time, the first switch tube Q1 is in the on state, and the relay 402 performs the contact pull-in action. After the control end of the first switch tube Q1 receives the first drive signal, the control end of the first switch tube Q1 stops receiving the first drive signal, and responds to the second drive signal of the holding control circuit, switches between the on state and the off state, and the relay 402 switches to the contact holding state after completing the contact pull-in action. When the first drive signal is a low-level signal, the first switch tube Q1 will not receive the first drive signal and the second drive signal. At this time, the first switch tube Q1 remains in the off state, that is, the relay 402 maintains the contact disconnected state.

[0062] like Figure 1As shown, the first driving signal is BUS Procharge, and the second driving signal is BUS ProchargePWM.

[0063] Figure 2 1 shows a driving timing diagram of a relay provided in some embodiments of the present application, such as Figure 2 As shown, in stage t1, the first switch tube is driven to be continuously turned on by the first driving signal, and in stage t2, the first switch tube is driven to be switched on and off by the second driving signal.

[0064] In the embodiment of the present application, a first switch tube Q1 connected to the relay 402 is provided in the driving circuit 100 of the relay 402, and the power-on state of the relay 402 can be controlled by controlling the on-off state of the first switch tube Q1, and a pull-in control circuit and a holding control circuit are provided in the driving circuit 100 of the relay 402. The pull-in control circuit can transmit a first driving signal to the control end of the first switch tube Q1 to drive the first switch tube Q1 to remain on, and automatically stop transmitting the first driving signal to the control end of the first switch tube Q1, and the holding control circuit can transmit a first driving signal to the control end of the first switch tube Q1 to drive the first switch tube Q1 to remain on. The control end of a switch tube Q1 transmits a second drive signal that drives the first switch tube Q1 to switch the conduction state, so that the first switch tube Q1 starts to switch between the conduction state and the cut-off state after maintaining the conduction state, so that the relay 402 enters the attracting and holding state after completing the attraction action, thereby reducing the loss of the relay coil L, reducing the temperature rise of the relay 402, improving the efficiency of the system power supply, and ensuring the attraction stability of the relay 402 in the attraction and holding stage, solving the problem in the related art that it is difficult to simultaneously ensure the contact attraction stability and low power consumption of the relay 402.

[0065] In some embodiments, optionally, the pull-in control circuit includes: a second switch tube Q2, wherein the first end of the second switch tube Q2 is used to receive a first drive signal; a first diode D1, wherein the anode of the first diode D1 is connected to the second end of the second switch tube Q2, and the cathode of the first diode D1 is used to transmit the first drive signal to the control end of the first switch tube Q1; a first capacitor C1, wherein the first end of the first capacitor C1 is connected to the third end of the second switch tube Q2, and the second end of the first capacitor C1 is grounded; and a first resistor R1, wherein the first end of the first resistor R1 is used to receive the first drive signal, and the second end of the first resistor R1 is used to transmit the first drive signal to the first capacitor C1 to charge the first capacitor C1.

[0066] In this embodiment, the pull-in control circuit includes a second switch tube Q2, a first diode D1, a first resistor R1 and a first capacitor C1. The first end of the second switch tube Q2 is used to receive the first drive signal, and the second end of the second switch tube Q2 is used to transmit the first drive signal to the control end of the first switch tube Q1. The first diode D1 is connected between the second end of the second switch tube Q2 and the control end of the first switch tube Q1, so that the first drive signal is unidirectionally transmitted to the control end of the first switch tube Q1. The first capacitor C1 is connected between the control end of the second switch tube Q2 and the ground end GND, the second end of the first resistor R1 is connected between the first capacitor C1 and the ground end GND, the first end of the first resistor R1 is used to receive the first drive signal, and the first capacitor C1 and the first resistor R1 form a time-delay closing module. After the first drive signal is a high-level signal for a preset time, the second switch tube Q2 is controlled to switch from the on state to the off state, thereby controlling the control end of the first switch tube Q1 to switch from receiving the first drive signal to receiving the second drive signal from the holding control circuit.

[0067] Specifically, the input end of the pull-in control circuit includes a first input end and a second input end. The first input end of the pull-in control circuit is the first end of the second switch tube Q2, the second input end of the pull-in control circuit is the first end of the first resistor R1, and the output end of the pull-in control circuit is the cathode of the first diode D1.

[0068] Exemplarily, the second switch tube Q2 may be a PNP transistor (Positive-Negative-Positive, a transistor consisting of two P-type semiconductors with one N-type semiconductor sandwiched in between).

[0069] In the embodiment of the present application, a second switch tube Q2 and a first diode D1 for transmitting a first drive signal are provided in the pull-in control circuit, so that when the second switch tube Q2 is turned on, the first drive signal can be stably transmitted to the control end of the first switch tube Q1, and a first capacitor C1 and a first resistor R1 for controlling the delayed shutdown of the second switch tube Q2 are also provided in the pull-in control circuit, so that the second switch tube Q2 can be automatically turned off after being turned on for a preset time, so that the control end of the first switch tube Q1 can automatically switch to receiving the second drive signal after receiving the first drive signal for a preset time.

[0070] In some embodiments, optionally, after the first switch tube Q1 transmits the first drive signal for a preset time period, it stops transmitting the first drive signal; wherein the preset time period is associated with a charging time constant of the first capacitor C1 and the first resistor R1.

[0071] In this embodiment, the preset duration for the pull-in control circuit to transmit the first drive signal to the control end of the first switch tube Q1 is related to the charging time constant of the first capacitor C1 and the first resistor R1. According to actual needs, the charging time constant of the first capacitor C1 and the first resistor R1 can be set, and the preset duration for the pull-in control circuit to output the first drive signal can be set.

[0072] Specifically, when the first drive signal is a high-level signal, the control end of the first switch tube Q1 first receives the first drive signal from the pull-in control circuit. At this time, the first switch tube Q1 is in the on state, and the relay 402 performs the contact pull-in action. After the control end of the first switch tube Q1 receives the first drive signal for a preset time, the control end of the first switch tube Q1 stops receiving the first drive signal, and in response to the second drive signal of the holding control circuit, switches between the on state and the off state. After the relay 402 completes the contact pull-in action, it switches to the contact holding state. When the first drive signal is a low-level signal, the first switch tube Q1 will not receive the first drive signal and the second drive signal. At this time, the first switch tube Q1 remains in the off state, that is, the relay 402 maintains the contact disconnected state.

[0073] In some embodiments, optionally, the holding control circuit includes: a third switch tube Q3, a first end of the third switch tube Q3 is used to receive the second drive signal, and a third end of the third switch tube Q3 is used to receive the first drive signal; a second diode D2, a first end of the second diode D2 is connected to the second end of the third switch tube Q3, and the second end of the second diode D2 is used to transmit the second drive signal to the control end of the first switch tube Q1.

[0074] In this embodiment, the holding control circuit includes a third switch tube Q3 and a second diode D2, the first end of the third switch tube Q3 is used to receive the second drive signal, the second end of the third switch tube Q3 is used to output the second drive signal, the control end of the third switch tube Q3 is used to receive the first drive signal, and the on-off state from the first end to the second end of the third switch tube Q3 is controlled by the high and low level states of the first drive signal. The second diode D2 is connected between the second end of the third switch tube Q3 and the control end of the first switch tube Q1, so that the second drive signal is transmitted unidirectionally to the control end of the first switch tube Q1.

[0075] When the first drive signal is a high level signal, the first end to the second end of the third switch tube Q3 is in a conducting state, and at this time, the second drive signal can be transmitted to the control end of the first switch tube Q1 through the third switch tube Q3. When the first drive signal is a low level signal, the first end to the second end of the third switch tube Q3 is in a cut-off state, and at this time, the second drive signal cannot be transmitted to the control end of the first switch tube Q1 through the third switch tube Q3.

[0076] Specifically, the second end of the third switch tube Q3 is the output end of the holding control circuit, the first end of the third switch tube Q3 is the second input end of the holding control circuit, and the second end of the third switch tube Q3 is the first input end of the holding control circuit.

[0077] In the embodiment of the present application, a third switch tube Q3 is provided in the holding control circuit, and the first end and the second end of the third switch tube Q3 are respectively used to receive and output the second drive signal, and the control end of the third switch tube Q3 is used to receive the first drive signal, so that the third switch tube Q3 can be controlled by the first drive signal to switch the on-off state, thereby improving the on-off action speed of the contacts of the relay 402.

[0078] In some embodiments, optionally, the holding control circuit also includes: a second resistor R2, a first end of the second resistor R2 is used to receive the first drive signal, and a second end of the second resistor R2 is connected to a third end of the third switch tube Q3; a third resistor R3, a first end of the third resistor R3 is connected to a second end of the second resistor R2, and a second end of the third resistor R3 is connected to a second end of the third switch tube Q3.

[0079] In the embodiment of the present application, the holding control circuit includes a second resistor R2 and a third resistor R3, and the second resistor R2 and the third resistor R3 are used to drive the third switch tube Q3. By setting the second resistor R2 and the third resistor R3 in the holding control circuit, the first drive signal can be transmitted to the control end of the third switch tube Q3, thereby driving the third switch tube Q3.

[0080] In some embodiments, optionally, the driving circuit also includes: the relay 402 includes a relay coil L, a first end of the relay coil L is connected to the power supply V, a second end of the relay coil L is connected to the first end of the first switch tube Q1, and a second end of the first switch tube Q1 is grounded.

[0081] In the embodiment of the present application, a relay coil L is provided in the relay 402. When the relay coil L is powered on, the contacts of the relay 402 can be driven to be in a closed state under the action of magnetic force. The relay coil L and the first switch tube Q1 are connected in series between the power supply V and the ground terminal. By controlling the on-off state of the first switch tube Q1, it is possible to switch whether the relay coil L is connected to the power supply V, thereby controlling whether the relay coil L is powered on.

[0082] Specifically, the relay coil L is connected between the power source V and the first switch tube Q1 , a first end of the first switch tube Q1 is connected to the relay coil L, and a second end of the first switch tube Q1 is grounded.

[0083] In some embodiments, optionally, the driving circuit 100 also includes: a fourth resistor R4, a first end of the fourth resistor R4 is connected to the control end of the first switch tube Q1, and a second end of the fourth resistor R4 is connected to the output end of the pull-in control circuit and the output end of the holding control circuit; a fifth resistor R5, a first end of the fifth resistor R5 is connected to the first end of the fourth resistor R4, and a second end of the fifth resistor R5 is grounded.

[0084] In the embodiment of the present application, the fourth resistor R4 and the fifth resistor R5 are driving resistors of the first switch tube Q1, and the second resistor R2 and the third resistor R3 are used to drive the first switch tube Q1. By setting the second resistor R2 and the third resistor R3 in the driving circuit 100, the first driving signal and the second driving signal can be transmitted to the control end of the first switch tube Q1, thereby driving the first switch tube Q1.

[0085] In some embodiments, optionally, the driving circuit 100 also includes: a Zener diode ZD, the positive electrode of the Zener diode ZD is connected to the first end of the first switch tube Q1, and the second end of the first switch tube Q1 is grounded; a third diode D3, the positive electrode of the third diode D3 is connected to the negative electrode of the Zener diode ZD, and the negative electrode of the third diode D3 is connected to the power supply V.

[0086] In this embodiment, the drive circuit 100 is further provided with a voltage regulator tube ZD and a third diode D3 connected in series, wherein the third diode D3 and the voltage regulator tube ZD are connected in reverse parallel to the relay coil L. The relay coil L is an inductor coil, which stores a certain amount of energy when the relay coil L is powered on. When the voltage of the relay coil L is disconnected, the energy in the relay coil L is released through the discharge circuit of the reversely connected third diode D3 and the voltage regulator tube ZD, thereby ensuring reliable disconnection of the contacts of the relay 402.

[0087] Specifically, when the second drive signal is transmitted to the first switch tube Q1, the first switch tube Q1 switches between the on state and the off state. When the first switch tube Q1 is turned off, the voltage of the relay coil L is reversed. The energy of the relay coil L when it is turned on is discharged through the third diode D3 and the voltage regulator tube ZD, ensuring that the contacts of the relay 402 can be reliably opened when the first switch tube Q1 is turned on next time.

[0088] In the embodiment of the present application, a third diode D3 and a voltage regulator ZD are arranged in the driving circuit 100 in reverse parallel with the relay coil L, so as to discharge part of the energy stored in the relay coil L, thereby ensuring the accuracy and flexibility of the on-off state switching of the contacts of the relay 402.

[0089] In some technical solutions, optionally, the driving circuit 100 further includes: a second capacitor C2, a first end of the second capacitor C2 is connected to the cathode of the third diode D3, and a second end of the second capacitor C2 is connected to the second end of the first switch tube Q1.

[0090] In this embodiment, a second capacitor C2 is further provided in the driving circuit 100. The second capacitor C2 is connected in parallel with the third diode D3, the voltage regulator and the first switch tube Q1 connected in series. The first end of the second capacitor C2 is connected to the cathode of the third diode D3, that is, the first end of the second capacitor C2 is connected to the power supply, and the second end of the second capacitor C2 is connected to the second end of the first switch tube Q1, that is, the second end of the second capacitor C2 is grounded.

[0091] In the embodiment of the present application, by setting a second capacitor C2 in parallel with the first switch tube Q1 in the drive circuit 100, when the first switch tube Q1 is turned off, the voltage of the relay coil L is reversed, and the energy of the relay coil L when it is turned on is discharged to the second capacitor C2 through the third diode D3 and the voltage regulator tube, so that the second capacitor C2 can play the role of energy storage and filtering in the drive circuit 100, further improving the stability of the drive circuit 100 in driving the relay 402.

[0092] In some embodiments, optionally, the driving circuit 100 further includes: a signal chip U1 , a power supply pin of the signal chip U1 is connected to a power source V, and a signal output pin of the signal chip U1 is connected to a second input terminal of the holding control circuit.

[0093] In an embodiment of the present application, the signal chip U1 is used to transmit a second drive signal to the second input end of the holding control circuit when powered on. By separately setting up a signal chip U1 for outputting the second drive signal, the PWM control pins and ordinary input and output pins of the controller can be saved, thereby reducing the occupancy of the controller's communication resources.

[0094] like Figure 1As shown, illustratively, a fourth capacitor C4 is provided between the pin 1 of the signal chip U1 and the ground terminal GND, and the fourth capacitor C4 is a filter capacitor. Pins 2, 3 and 4 of the signal chip U1 are grounded. Pin 5 of the signal chip U1 is connected to the sixth resistor R6, and pin 5 of the signal chip U1 is the output terminal of the signal chip U1. Pin 6 of the signal chip U1 is connected to the power supply V, and the power supply V is also connected to the seventh capacitor C7, and the seventh capacitor C7 is used for energy storage, and the fifth capacitor C5 is connected in parallel with the seventh capacitor C7, and the fifth capacitor C5 filters the power supply signal output by the power supply V. Pin 7 of the signal chip U1 is connected to the seventh resistor R7 and the third capacitor C3, and the seventh resistor R7 and the third capacitor C3 are the drive circuit 100 of the signal chip U1, and the seventh resistor R7 and the third capacitor C3 are used to determine the operating frequency of the control chip, that is, the signal frequency of the second drive signal output. The sixth capacitor C6 is connected between the pin 7 of the control chip and the ground terminal GND, and the sixth capacitor C6 is used for high-frequency filtering. Among them, the power supply V for the signal chip U1 is a +12V power supply.

[0095] Exemplarily, the duty cycle of the second driving signal is 50%.

[0096] In some embodiments, optionally, the driving circuit 100 further includes: a controller 103 , wherein a signal output terminal of the controller 103 is connected to an input terminal of the pull-in control circuit 101 , and a signal output terminal of the controller 103 is connected to a first input terminal of the hold control circuit 102 .

[0097] In the embodiment of the present application, the controller in the drive circuit 100 is used to output a first drive signal, and the first drive signal is transmitted to the pull-in control circuit so that the pull-in control circuit transmits the first drive signal to the first switch tube Q1, and the first drive signal is transmitted to the holding control circuit so that the holding control circuit transmits the second drive signal to the first switch tube Q1.

[0098] Figure 3 A functional block diagram of a driving circuit provided in some embodiments of the present application is shown. Figure 3 As shown, the relay 402 includes a relay coil L, and the control circuit 104 includes a pull-in control circuit 101 and a hold control circuit 102. The PWM circuit 105 includes a signal chip U1 and other peripheral circuits.

[0099] According to one embodiment of the present application, Figure 4 A structural block diagram of a power supply device is shown in some embodiments of the present application. Figure 4As shown, the power supply device 400 includes: a relay 402, the relay 402 includes a relay coil; the drive circuit 100 in any of the above embodiments, the first switch tube in the drive circuit 100 is connected to the relay coil; therefore, it has all the beneficial technical effects of the drive circuit 100 in any of the above embodiments, which will not be repeated here.

[0100] Exemplarily, the power supply device 400 is connected to the photovoltaic assembly.

[0101] It should be clarified that in the claims, specification and drawings of the present application, the term "multiple" refers to two or more than two. Unless otherwise clearly defined, the orientation or position relationship indicated by the terms "upper" and "lower" is based on the orientation or position relationship shown in the drawings, which is only for the purpose of more conveniently describing the present application and making the description process easier, rather than indicating or implying that the device or element referred to must have the specific orientation described, be constructed and operated in a specific orientation, so these descriptions cannot be understood as limitations on the present application; the terms "connect", "install", "fix" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection between multiple objects, or a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects, or an indirect connection between multiple objects through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood based on the specific circumstances of the above data.

[0102] In the claims, specification and drawings of the present application, the description of the terms "one embodiment", "some embodiments", "specific embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the claims, specification and drawings of the present application, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0103] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A driving circuit, characterized in that: Applied to driving a relay, the driving circuit comprises: A first switch tube, wherein the first switch tube is connected to the relay; A pull-in control circuit, wherein the input end of the pull-in control circuit is used to receive a first drive signal, the output end of the pull-in control circuit is connected to the control end of the first switch tube, and the pull-in control circuit is used to stop transmitting the first drive signal after transmitting the first drive signal to the first switch tube; a holding control circuit, wherein a first input end of the holding control circuit is used to receive a first drive signal, a second input end of the holding control circuit is used to receive a second drive signal, an output end of the holding control circuit is connected to a control end of the first switch tube, and the holding control circuit is used to transmit the second drive signal to the control end of the first switch tube in response to the first drive signal; The first drive signal is used to drive the first switch tube to turn on so that the relay is in an energized state, and the second drive signal is used to drive the first switch tube to switch between an on state and an off state so that the relay is in a held state.

2. The driving circuit according to claim 1, characterized in that: The pull-in control circuit comprises: A second switch tube, wherein a first end of the second switch tube is used to receive the first driving signal; a first diode, wherein an anode of the first diode is connected to the second end of the second switch tube, and a cathode of the first diode is used to transmit the first driving signal to the control end of the first switch tube; A first capacitor, wherein a first end of the first capacitor is connected to a third end of the second switch tube, and a second end of the first capacitor is grounded; A first resistor, wherein a first end of the first resistor is used to receive the first driving signal, and a second end of the first resistor is used to transmit the first driving signal to the first capacitor to charge the first capacitor.

3. The driving circuit according to claim 2, characterized in that: After the first switch tube transmits the first drive signal for a preset time period, it stops transmitting the first drive signal; wherein the preset time period is associated with a charging time constant of the first capacitor and the first resistor.

4. The driving circuit according to claim 1, characterized in that: The holding control circuit comprises: a third switch tube, wherein a first end of the third switch tube is used to receive the second drive signal, and a third end of the third switch tube is used to receive the first drive signal; A second diode, wherein a first end of the second diode is connected to a second end of the third switch tube, and the second end of the second diode is used to transmit the second driving signal to a control end of the first switch tube.

5. The driving circuit according to claim 4, characterized in that: The holding control circuit also includes: a second resistor, wherein a first end of the second resistor is used to receive the first driving signal, and a second end of the second resistor is connected to a third end of the third switch tube; A third resistor, wherein a first end of the third resistor is connected to a second end of the second resistor, and a second end of the third resistor is connected to a second end of the third switch tube.

6. The driving circuit according to any one of claims 1 to 5, characterized in that: The relay comprises a relay coil, a first end of the relay coil is connected to a power source, a second end of the relay coil is connected to a first end of a first switch tube, and a second end of the first switch tube is grounded.

7. The driving circuit according to any one of claims 1 to 5, characterized in that: The driving circuit further includes: a fourth resistor, wherein a first end of the fourth resistor is connected to the control end of the first switch tube, and a second end of the fourth resistor is connected to the output end of the pull-in control circuit and the output end of the hold control circuit; A fifth resistor, wherein a first end of the fifth resistor is connected to the first end of the fourth resistor, and a second end of the fifth resistor is grounded.

8. The driving circuit according to any one of claims 1 to 5, characterized in that: Also includes: A voltage regulator tube, wherein the positive electrode of the voltage regulator tube is connected to the first end of the first switch tube, and the second end of the first switch tube is grounded; A third diode, wherein the anode of the third diode is connected to the cathode of the voltage regulator tube, and the cathode of the third diode is connected to the power supply.

9. The driving circuit according to claim 8, characterized in that: Also includes: A second capacitor, wherein a first end of the second capacitor is connected to the cathode of the third diode, and a second end of the second capacitor is connected to the second end of the first switch tube.

10. The driving circuit according to any one of claims 1 to 5, characterized in that: Also includes: A signal chip, wherein a power supply pin of the signal chip is connected to a power source, and a signal output pin of the signal chip is connected to a second input end of the holding control circuit.

11. The driving circuit according to any one of claims 1 to 5, characterized in that: Also includes: A controller, wherein a signal output end of the controller is connected to an input end of the pull-in control circuit, and a signal output end of the controller is connected to a first input end of the hold control circuit.

12. A power supply device, characterized in that: include: A relay, wherein the relay comprises a relay coil; The drive circuit according to any one of claims 1 to 11, wherein the first switch tube in the drive circuit is connected to the relay coil.

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