Low-power-consumption auxiliary power supply circuit of charging module
By designing a low-power auxiliary power circuit in the charging module and adjusting the frequency of the switch tube control signal, the problem of high power consumption in the standby state of the charging module is solved, and the effect of reducing standby power consumption and power loss is achieved.
Patent Information
- Application Number
- CN202422361582.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-09-26
AI Technical Summary
The charging module consumes a lot of power in standby state, resulting in increased power loss, increased usage cost and does not meet the energy conservation and emission reduction requirements.
Design a charging module low-power auxiliary power circuit, including a transformer module, a control module and a switch tube, and adjusts the frequency of the switch tube control signal output by the control chip, reduces the switching tube loss, thereby reducing the power consumption of the auxiliary power circuit.
It effectively reduces the standby power consumption of the charging module, reduces power loss, reduces usage costs, and meets the requirements of energy conservation and emission reduction.
Smart Images
Figure CN222953933U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of charging modules of charging piles, and more specifically, to a low-power auxiliary power supply circuit of a charging module. Background Art
[0002] With the rapid development of the new energy vehicle industry, the demand for charging piles is increasing day by day. The charging pile includes multiple charging modules and is in standby mode when not in use. When the charging pile is in standby mode, the internal charging module of the charging pile is also in standby mode. However, the auxiliary power supply, communication circuit, and panel inside the charging module in standby mode are all in working state, so the standby power consumption is relatively large. A single module generally has a power consumption of more than ten watts to more than twenty watts. Long-term use will result in a large amount of accumulated power loss, which increases the cost of use and does not meet the requirements of energy conservation and emission reduction. Since the standby power consumption is mainly generated by the auxiliary power supply when the charging module is in standby mode, reducing the power consumption of the auxiliary power supply can reduce the standby power consumption. Utility Model Content
[0003] The technical problem to be solved by the utility model is that, in view of the above-mentioned defects of the prior art, a low-power auxiliary power supply circuit of a charging module is provided, which can reduce the power consumption of the auxiliary power supply and thus reduce the standby power consumption of the charging module.
[0004] The technical solution adopted by the utility model to solve the technical problem is: construct a low-power auxiliary power supply circuit of a charging module, including a transformer module, an output module arranged on the secondary side of the transformer module, a power supply start-up module, a control module and a switch tube arranged on the primary side of the transformer module;
[0005] The control module includes a control chip, an adjusting resistor and an adjusting capacitor; the signal output end of the control chip is connected to the control end of the switch tube, the first end of the switch tube is connected to the second end of the primary winding of the transformer module, the first end of the primary winding of the transformer module is connected to the input voltage via the power supply startup module, and the second end of the switch tube is grounded; the adjusting resistor is connected between the reference voltage end and the clock end of the control chip, the adjusting capacitor is connected between the clock end and the ground end of the control chip, and the ground end of the control chip is grounded; the resistance value and capacitance value of the adjusting resistor and the adjusting capacitor are respectively adjustable to adjust the frequency of the switch tube control signal output by the signal output end of the control chip, thereby controlling the switching frequency of the switch tube.
[0006] In the low-power auxiliary power supply circuit of the charging module described in the utility model, the control chip includes a UCC28 series control chip and a UCC38 series control chip.
[0007] In the low-power auxiliary power supply circuit of the charging module described in the utility model, the switch tube is a MOS tube; the control module further includes a current limiting resistor, a pull-down resistor and a first capacitor; the current limiting resistor is connected between the signal output end of the control chip and the gate of the MOS tube, the pull-down resistor and the first capacitor are respectively connected between the gate and the source of the MOS tube, and the drain of the MOS tube is connected to the second end of the primary winding of the transformer module.
[0008] In the low-power auxiliary power supply circuit of the charging module described in the utility model, an absorption module is further included which is connected between the first end of the primary winding of the transformer module, the second end of the primary winding and the drain of the MOS tube;
[0009] The absorption module includes an absorption resistor, an absorption capacitor and an absorption diode. The first end of the absorption capacitor and the first end of the absorption resistor are both connected to the first end of the primary winding of the transformer module, the second end of the absorption capacitor and the second end of the absorption resistor are both connected to the cathode of the absorption diode, and the anode of the absorption diode is connected to the second end of the primary winding of the transformer module and the drain of the MOS tube.
[0010] In the low-power auxiliary power supply circuit of the charging module described in the utility model, the transformer module includes a first primary winding and a second primary winding; the power supply start-up module includes a start-up unit and a power supply unit;
[0011] The startup unit includes a startup resistor, a startup capacitor and a voltage regulator diode, wherein the anode of the voltage regulator diode is grounded, the cathode is connected to the first end of the startup resistor, the first end of the startup capacitor and the power supply end of the control chip, the second end of the startup resistor is connected to the input voltage, and the second end of the startup capacitor is grounded;
[0012] The power supply unit includes a first power supply capacitor, a second power supply capacitor, a power supply diode and a power supply resistor; the anode of the power supply diode and the first end of the power supply resistor are connected to the second end of the second primary winding, the first end of the second primary winding is grounded, the cathode of the power supply diode is connected to the power supply end of the control chip, the second end of the power supply resistor is connected to the power supply end of the control chip via the first power supply capacitor, and the second power supply capacitor is connected between the power supply end of the control chip and the first end of the second primary winding.
[0013] In the low-power auxiliary power supply circuit of the charging module described in the utility model, it further includes a voltage sampling module connected to the voltage sampling feedback terminal of the control chip;
[0014] The voltage sampling module includes a first voltage sampling resistor and a second voltage sampling resistor; the first voltage sampling resistor and the second voltage sampling resistor are connected in series between the power supply terminal and the ground of the control chip, and the voltage sampling feedback terminal of the control chip is connected to the connection point of the first voltage sampling resistor and the second voltage sampling resistor.
[0015] In the low-power auxiliary power supply circuit of the charging module described in the utility model, the voltage sampling module further includes a first resistor and a second capacitor; the first resistor and the second capacitor are connected in series between the voltage sampling feedback terminal and the compensation terminal of the control chip.
[0016] In the low-power auxiliary power supply circuit of the charging module described in the utility model, it further includes a current sampling module connected to the current sampling feedback terminal of the control chip;
[0017] The current sampling module includes a first current sampling resistor, a second current sampling resistor and a current sampling capacitor; the first current sampling resistor and the second current sampling resistor are connected in series between the current sampling feedback terminal of the control chip and the ground, and the current sampling capacitor is also connected between the current sampling feedback terminal of the control chip and the ground.
[0018] The low-power auxiliary power supply circuit of the charging module of the utility model is implemented. Through clever circuit design, a small number of electronic devices are used to adjust the resistance value and the capacitance value, thereby adjusting the frequency of the switch tube control signal output by the control chip, thereby reducing the switch tube loss and further reducing the power consumption of the auxiliary power supply circuit and the standby power consumption of the charging module. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:
[0020] Figure 1 It is a principle block diagram of a preferred embodiment of a low-power auxiliary power supply circuit of a charging module of the utility model;
[0021] Figure 2 It is a circuit diagram of another preferred embodiment of the low-power auxiliary power supply circuit of the charging module of the utility model. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.
[0023] Figure 1 This is a principle block diagram of a preferred embodiment of the low-power auxiliary power supply circuit of the charging module of the utility model. Figure 1 As shown, a low-power auxiliary power supply circuit of a charging module of the utility model includes a transformer module 300, an output module 400 arranged on the secondary side of the transformer module 300, a power supply start-up module 100, a control module 300 and a switch tube Q1 arranged on the primary side of the transformer module 300. The control module 300 includes a control chip 310, an adjustment resistor R2 and an adjustment capacitor C3.
[0024] like Figure 1 As shown, the transformer module 300 includes a transformer, and the transformer includes a primary winding and a secondary winding, an output module 400 is connected to the secondary winding of the transformer, and the power supply startup module 100, the control module 300 and the switch tube Q1 are connected to the primary winding of the transformer. Of course, those skilled in the art know that the transformer module 300 can also include multiple secondary windings, and multiple output modules 400 are respectively connected to the multiple secondary windings of the transformer module 300. The transformer module can also include at least two primary windings, one of which is used to construct the power supply startup module 100. Of course, in other preferred embodiments of the utility model, power supply startup modules 100 with other structures can also be used, and these all fall within the protection scope of the utility model.
[0025] Further Figure 1 As shown, the first input end of the power supply startup module 100 receives the input voltage Vin, the second input end is grounded GND, the first output end is connected to the first end of the primary winding of the transformer module 300, the second output end is grounded GND, and the third output end is connected to the power supply end VDD of the control chip 310. The signal output end OUT of the control chip 310 is connected to the control end of the switch tube Q1, the first end of the switch tube Q1 is connected to the second end of the primary winding of the transformer module 300, and the second end of the switch tube Q1 is grounded GND. The regulating resistor R2 is connected between the reference voltage end VREF and the clock end RT / CT of the control chip 310, the regulating capacitor C3 is connected between the clock end RT / CT and the ground end GND of the control chip 310, and the ground end GND of the control chip 310 is grounded. The resistance value and the capacitance value of the regulating resistor R2 and the regulating capacitor C3 are respectively adjustable to adjust the frequency of the switch tube control signal output from the signal output end OUT of the control chip 310, thereby controlling the switching frequency of the switch tube Q1.
[0026] In a preferred embodiment of the utility model, the control chip 310 includes a UCC28 series control chip 310 and a UCC38 series control chip 310. For example, the control chip 310 may be a UCC28C45 chip. The control end of the switch tube Q1 is connected to the signal output end OUT of the control chip 310, thereby receiving the switch tube control signal. The control chip 310 generates the switch tube control signal based on the signal received by the reference voltage end VREF and the clock end RT / CT. When the resistance value and the capacitance value of the adjustment resistor R2 and the adjustment capacitor C3 are adjusted, the frequency of the switch tube control signal can be adjusted, thereby changing the switching frequency of the switch tube Q1, thereby reducing the turn-on and turn-off losses of the switch tube Q1, thereby reducing the power consumption of the auxiliary power supply circuit, and thereby reducing the standby power consumption of the charging module.
[0027] The low-power auxiliary power supply circuit of the charging module of the utility model is implemented. Through clever circuit design, a small number of electronic devices are used to adjust the resistance value and the capacitance value, thereby adjusting the frequency of the switch tube control signal output by the control chip, thereby reducing the switch tube loss and further reducing the power consumption of the auxiliary power supply circuit and the standby power consumption of the charging module.
[0028] Figure 2 FIG. 2 is a circuit diagram of another preferred embodiment of the low-power auxiliary power supply circuit of the charging module of the utility model. Figure 2 As shown, the low-power auxiliary power supply circuit of the charging module of the utility model includes a transformer module 300, an output module 400 arranged on the secondary side of the transformer module 300, a power supply start-up module 100, a control module 300 and a switch tube Q1 arranged on the primary side of the transformer module 300. Further, as Figure 2 As shown, the charging module low power auxiliary power circuit further includes an absorption module, a voltage sampling module, and a current sampling module. The power supply start module 100 includes a start unit and a power supply unit.
[0029] exist Figure 2 In the preferred embodiment shown, the transformer module 300 may also include two primary windings and multiple secondary windings, one primary winding is used to construct the power supply startup module 100, one primary winding is connected to the switching tube and the absorption module, and multiple output modules 400 are respectively connected to multiple secondary windings of the transformer module 300.
[0030] Further Figure 2 As shown, the switch tube Q1 is a MOS tube. Of course, in other preferred embodiments of the present invention, triodes, IGBT tubes, etc. can also be used, which all fall within the protection scope of the present invention.
[0031] The control module 300 includes a control chip 310, an adjustment resistor R2, an adjustment capacitor C3, a current limiting resistor R4, a pull-down resistor R5 and a capacitor C5. Figure 2 As shown, the control chip 310 can be a UCC28 series control chip and a UCC38 series control chip, and is preferably a UCC28C45 chip. The power supply terminal VDD of the control chip 310 is connected to the startup unit and the power supply unit, the voltage sampling feedback terminal FB is connected to the voltage sampling module, the current sampling feedback terminal CS is connected to the current sampling module, the reference voltage terminal VREF and the clock terminal RT / CT are connected to the adjustment resistor R2 and the adjustment capacitor C3, and the ground terminal GND is grounded.
[0032] Specifically, the regulating resistor R2 is connected between the reference voltage terminal VREF and the clock terminal RT / CT of the control chip 310, and the regulating capacitor C3 is connected between the clock terminal RT / CT and the ground terminal GND of the control chip 310. The control chip 310 generates the switch tube control signal based on the signal received from the reference voltage terminal VREF and the clock terminal RT / CT. When the resistance value and the capacitance value of the regulating resistor R2 and the regulating capacitor C3 are adjusted, the frequency of the switch tube control signal can be adjusted, thereby changing the switching frequency of the switch tube Q1, thereby reducing the turn-on and turn-off losses of the switch tube Q1, thereby reducing the power consumption of the auxiliary power supply circuit, and thereby reducing the standby power consumption of the charging module.
[0033] The current limiting resistor R4 is connected between the signal output terminal OUT of the control chip 310 and the gate of the MOS transistor Q1, the pull-down resistor R5 and the capacitor C5 are respectively connected between the gate and the source of the MOS transistor Q1, and the drain of the MOS transistor Q1 is connected to the second end of the first primary winding of the transformer module 300. The current limiting resistor R4, the pull-down resistor R5 and the capacitor C5 can prevent parasitic current, high and low frequency interference and electrostatic breakdown. Of course, in a simplified embodiment of the utility model, at least one of the current limiting resistor R4, the pull-down resistor R5 and the capacitor C5 can be omitted.
[0034] Further Figure 2As shown, the absorption module is connected between the first end of the first primary winding of the transformer module 300, the second end of the first primary winding, and the drain of the MOS tube Q1. The absorption module includes an absorption resistor R3, an absorption capacitor C4, and an absorption diode D1. The first end of the absorption capacitor C4 and the first end of the absorption resistor R3 are both connected to the first end of the first primary winding of the transformer module 300, the second end of the absorption capacitor C4 and the second end of the absorption resistor R3 are both connected to the cathode of the absorption diode D1, and the anode of the absorption diode D1 is connected to the second end of the first primary winding of the transformer module 300 and the drain of the MOS tube Q1. Setting the absorption module can remove the peak voltage generated by the leakage inductance of the transformer module, adjust the duty cycle of the MOS tube and prevent the hiccup mode.
[0035] Further Figure 2 As shown, the startup unit includes a startup resistor R1, a startup capacitor C1 and a voltage regulator diode DZ1. The power supply unit includes a power supply capacitor C9, a power supply capacitor C8, a power supply diode D2 and a power supply resistor R11. The anode of the voltage regulator diode DZ1 is grounded GND, and the cathode is connected to the first end of the startup resistor R1, the first end of the startup capacitor C1 and the power supply terminal VDD of the control chip 310. The second end of the startup resistor R1 is connected to the input voltage Vin, and the second end of the startup capacitor C1 is grounded GND. The anode of the power supply diode D2 and the first end of the power supply resistor R11 are connected to the second end of the second primary winding, the first end of the second primary winding is grounded GND, the cathode of the power supply diode D2 is connected to the power supply terminal VDD of the control chip, the second end of the power supply resistor R11 is connected to the power supply terminal VDD of the control chip via the power supply capacitor C9, and the power supply capacitor C8 is connected between the power supply terminal VDD of the control chip and the first end of the second primary winding. By using the aforementioned startup unit and power supply unit, power can be taken from the primary side of the transformer module 300 , thereby providing a power supply voltage for the control chip 310 .
[0036] The voltage sampling module includes a voltage sampling resistor R9, a second voltage sampling resistor R10, a resistor R8 and a capacitor C7. The voltage sampling resistor R9 and the second voltage sampling resistor R10 are connected in series between the power supply terminal VDD and the ground of the control chip 310, and the voltage sampling feedback terminal FB of the control chip 310 is connected to the connection point of the voltage sampling resistor R9 and the second voltage sampling resistor R10. The resistor R8 and the capacitor C7 are connected in series between the voltage sampling feedback terminal FB and the compensation terminal COMP of the control chip 310. The current sampling module includes a current sampling resistor R6, a current sampling resistor R7 and a current sampling capacitor C6; the current sampling resistor R6 and the current sampling resistor R7 are connected in series between the current sampling feedback terminal CS and the ground of the control chip 310, and the current sampling capacitor C6 is also connected between the current sampling feedback terminal CS and the ground of the control chip 310. By setting the voltage sampling module and the current sampling module, the current and voltage signals of the primary side of the transformer module can be sampled, and the switch tube control signal can be adjusted based on the current and voltage signals, thereby preventing the switch tube from overcurrent or overvoltage.
[0037] The low-power auxiliary power supply circuit of the charging module of the utility model is implemented. Through clever circuit design, a small number of electronic devices can be used to adjust the resistance value and the capacitance value, thereby adjusting the frequency of the switch control signal output by the control chip, thereby reducing the switch loss, and further reducing the power consumption of the auxiliary power supply circuit and the standby power consumption of the charging module. The low-power auxiliary power supply circuit of the charging module of the utility model can reduce the power consumption of the charging module from 20+W to less than 6W.
[0038] Although the present invention is described through specific embodiments, it should be understood by those skilled in the art that various changes and equivalent substitutions may be made to the present invention without departing from the scope of the present invention. In addition, various modifications may be made to the present invention for specific situations or materials without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed, but should include all implementation methods that fall within the scope of the claims of the present invention.
[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A low-power auxiliary power supply circuit for a charging module, characterized in that: It includes a transformer module, an output module arranged on the secondary side of the transformer module, and a power supply start-up module, a control module and a switch tube arranged on the primary side of the transformer module; The control module includes a control chip, an adjusting resistor and an adjusting capacitor; the signal output end of the control chip is connected to the control end of the switch tube, the first end of the switch tube is connected to the second end of the primary winding of the transformer module, the first end of the primary winding of the transformer module is connected to the input voltage via the power supply startup module, and the second end of the switch tube is grounded; the adjusting resistor is connected between the reference voltage end and the clock end of the control chip, the adjusting capacitor is connected between the clock end and the ground end of the control chip, and the ground end of the control chip is grounded; the resistance value and capacitance value of the adjusting resistor and the adjusting capacitor are respectively adjustable to adjust the frequency of the switch tube control signal output by the signal output end of the control chip, thereby controlling the switching frequency of the switch tube.
2. The low-power auxiliary power supply circuit of the charging module according to claim 1, characterized in that: The control chips include UCC28 series control chips and UCC38 series control chips.
3. The low-power auxiliary power supply circuit of the charging module according to claim 2, characterized in that: The switch tube is a MOS tube; the control module further includes a current limiting resistor, a pull-down resistor and a first capacitor; the current limiting resistor is connected between the signal output end of the control chip and the gate of the MOS tube, the pull-down resistor and the first capacitor are respectively connected between the gate and the source of the MOS tube, and the drain of the MOS tube is connected to the second end of the primary winding of the transformer module.
4. The low-power auxiliary power supply circuit of the charging module according to claim 3, characterized in that: Further comprising an absorption module connected between the first end of the primary winding of the transformer module, the second end of the primary winding and the drain of the MOS tube; The absorption module includes an absorption resistor, an absorption capacitor and an absorption diode. The first end of the absorption capacitor and the first end of the absorption resistor are both connected to the first end of the primary winding of the transformer module, the second end of the absorption capacitor and the second end of the absorption resistor are both connected to the cathode of the absorption diode, and the anode of the absorption diode is connected to the second end of the primary winding of the transformer module and the drain of the MOS tube.
5. The low-power auxiliary power supply circuit of the charging module according to any one of claims 1 to 4, characterized in that: The transformer module includes a first primary winding and a second primary winding; the power supply start-up module includes a start-up unit and a power supply unit; The startup unit includes a startup resistor, a startup capacitor and a voltage regulator diode, wherein the anode of the voltage regulator diode is grounded, the cathode is connected to the first end of the startup resistor, the first end of the startup capacitor and the power supply end of the control chip, the second end of the startup resistor is connected to the input voltage, and the second end of the startup capacitor is grounded; The power supply unit includes a first power supply capacitor, a second power supply capacitor, a power supply diode and a power supply resistor; The anode of the power supply diode and the first end of the power supply resistor are connected to the second end of the second primary winding, the first end of the second primary winding is grounded, the cathode of the power supply diode is connected to the power supply end of the control chip, the second end of the power supply resistor is connected to the power supply end of the control chip via the first power supply capacitor, and the second power supply capacitor is connected between the power supply end of the control chip and the first end of the second primary winding.
6. The low-power auxiliary power supply circuit of the charging module according to any one of claims 1 to 4, characterized in that: Further comprising a voltage sampling module connected to the voltage sampling feedback terminal of the control chip; The voltage sampling module includes a first voltage sampling resistor and a second voltage sampling resistor; the first voltage sampling resistor and the second voltage sampling resistor are connected in series between the power supply terminal and the ground of the control chip, and the voltage sampling feedback terminal of the control chip is connected to the connection point of the first voltage sampling resistor and the second voltage sampling resistor.
7. The low-power auxiliary power supply circuit of the charging module according to claim 6, characterized in that: The voltage sampling module further includes a first resistor and a second capacitor; the first resistor and the second capacitor are connected in series between the voltage sampling feedback terminal and the compensation terminal of the control chip.
8. The low-power auxiliary power supply circuit of the charging module according to any one of claims 1 to 4, characterized in that: Further comprising a current sampling module connected to the current sampling feedback terminal of the control chip; The current sampling module includes a first current sampling resistor, a second current sampling resistor and a current sampling capacitor; the first current sampling resistor and the second current sampling resistor are connected in series between the current sampling feedback terminal of the control chip and the ground, and the current sampling capacitor is also connected between the current sampling feedback terminal of the control chip and the ground.