CN218733926U - Step-down driving power supply, double-motor driving circuit and electronic equipment - Google Patents
Step-down driving power supply, double-motor driving circuit and electronic equipment Download PDFInfo
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- CN218733926U CN218733926U CN202222759745.9U CN202222759745U CN218733926U CN 218733926 U CN218733926 U CN 218733926U CN 202222759745 U CN202222759745 U CN 202222759745U CN 218733926 U CN218733926 U CN 218733926U
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Abstract
The application relates to a step-down driving power supply, two motor drive circuit and electronic equipment, include: the power supply comprises a power supply input end, a rectifying unit, a filtering unit, a voltage reducing unit, a power supply output end, a voltage detecting unit, a current sampling unit and a controller; the power supply input end is used for connecting a high-voltage alternating current input, and the power supply output end is used for providing high-voltage direct current output; the input end of the rectifying unit is connected with the power input end, the output end of the rectifying unit is connected with the first end of the filtering unit, the second end of the filtering unit is connected with the first end of the voltage reduction unit, the second end of the voltage reduction unit is connected with the current sampling unit and the controller, the third end of the voltage reduction unit is connected with the controller, the first end of the voltage detection unit is connected with the power output end, and the second end of the voltage detection unit is connected with the controller. The circuit is simple and low in cost.
Description
Technical Field
The application relates to the technical field of power supply circuits, in particular to a voltage reduction driving power supply, a double-motor driving circuit and electronic equipment.
Background
Currently, many devices need relatively high voltage input to provide work, and in these three-phase high-voltage power supply electronic devices, the three-phase ac input is rectified to obtain a high voltage, which makes the power devices and driving chips used in the post-stage power processing circuit of the electronic device need relatively high withstand voltage, i.e. a high-power device needs to be selected, so that the cost of the whole circuit, i.e. the electronic device, is relatively increased, and the competitiveness of the product is reduced.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the application is to provide a step-down driving power supply, a dual-motor driving circuit and an electronic device.
The technical scheme adopted by the application for solving the technical problem is as follows: a step-down driving power supply is constructed, including: the power supply comprises a power supply input end, a rectifying unit, a filtering unit, a voltage reducing unit, a power supply output end, a voltage detecting unit, a current sampling unit and a controller;
the power supply input end is used for connecting a high-voltage alternating current input, and the power supply output end is used for providing high-voltage direct current output;
the input of rectifier cell is connected the power input end, rectifier cell's output is connected filter cell's first end, filter cell's second end is connected step-down cell's first end with the power output end, step-down cell's second end is connected the current sampling unit, step-down cell's third end is connected the controller, voltage detection unit's first end is connected the power output end, voltage detection unit's second end is connected the controller.
Preferably, in the step-down driving power supply described in the present application, the voltage detection unit includes: the circuit comprises a first voltage division circuit, a second voltage division circuit, a voltage stabilizing circuit and an optical coupling circuit;
the first end of the first voltage division circuit and the first end of the second voltage division circuit are respectively connected with the power output end, the second end of the first voltage division circuit is connected with the first end of the optocoupler circuit, the third end of the first voltage division circuit is connected with the second end of the optocoupler circuit and the first end of the voltage stabilizing circuit, the second end of the second voltage division circuit is connected with the second end of the voltage stabilizing circuit, the third end of the second voltage division circuit and the third end of the voltage stabilizing circuit are connected with the ground of the power output end, the third end of the optocoupler circuit is connected with the controller, and the fourth end of the optocoupler circuit is connected with the ground of the filtering unit.
Preferably, in the step-down driving power supply described in the present application, the optical coupler circuit includes an optical coupler chip U2 and a resistor R11;
the first pin of the optical coupling chip U2 is connected with the second end of the first voltage division unit, the second pin of the optical coupling chip U2 is connected with the third end of the first voltage division unit and the second end of the voltage stabilizing circuit, the third pin of the optical coupling chip U2 and the first end of the resistor R11 are connected with the ground of the filtering unit, and the fourth pin of the optical coupling chip U2 and the second end of the resistor R11 are connected with the controller.
Preferably, in the step-down driving power supply described in the present application, the voltage stabilizing circuit includes: a voltage stabilizing chip D8, a resistor R14 and a capacitor C5;
the first pin of voltage stabilizing chip D8 is connected the first end of resistance R14 with the second end of second divider circuit, voltage stabilizing chip D8's second pin is connected the first end of electric capacity C5 with opto-coupler chip U2's second pin, electric capacity C5's second end is connected the second end of resistance R14, voltage stabilizing chip D8's third pin is connected the ground of power output end.
Preferably, in the step-down driving power supply described in the present application, the first voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor, a first end of the first voltage-dividing resistor is connected to the power output end, a second end of the first voltage-dividing resistor is connected to a first pin of the optical coupler chip U2 and a first end of the second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is connected to a second pin of the optical coupler chip U2 and a second pin of the voltage stabilizing chip D8; and/or
The second voltage division circuit comprises a third voltage division resistor and a fourth voltage division resistor, wherein a first end of the third voltage division resistor is connected with the power output end, a second end of the third voltage division resistor is connected with a first end of the resistor R14 and a first pin of the voltage stabilization chip D8, and a third end of the third voltage division resistor is connected with the ground of the power output end.
Preferably, in this application step-down drive power supply, the filter unit includes filter inductance and filter capacitance, filter inductance's first end is connected the output of rectifier unit, filter inductance's second end is connected filter capacitance's positive pole the first end of step-down unit the power output end with the controller, filter capacitance's negative pole ground connection.
Preferably, in the buck driving power supply according to the present application, the buck unit includes a diode D4, an inductor L2, a resistor R2, and a transistor Q1; the negative pole of diode D4 is connected the second end of filter inductance, diode D4's positive pole is connected inductance L2's first end with triode Q1's collecting electrode, inductance L2's second end is connected power output end's ground, triode Q1's projecting pole is connected the current sampling unit the controller with resistance R2's first end, triode Q1's base is connected resistance R2's second end with the controller.
Preferably, in the step-down driving power supply described in the present application, the current sampling unit includes a sampling resistor RS3, a resistor R8 and a capacitor C3, the first end of the sampling resistor RS3 is connected to the emitter of the transistor Q1 and the first end of the resistor R8, the second end of the resistor R8 is connected to the controller and the first end of the capacitor C3, and the second end of the sampling resistor RS3 and the second end of the capacitor C3 are connected to the ground of the filtering unit.
Preferably, in the step-down driving power supply described in the present application, the controller includes a PWM control chip U1, a resistor R4, and a resistor R5;
PWM control chip U1's first pin ground connection, PWM control chip U1's second pin warp resistance R4 connects filter inductance's second end, PWM control chip U1's third pin is connected opto-coupler chip U2's fourth pin, PWM control chip U1's fourth pin is connected resistance R8's second end, a power supply is connected to PWM control chip U1's fifth pin, PWM control chip U1's sixth pin warp resistance R5 connects triode Q1's base.
The present application further constructs an electronic device comprising: the voltage-reducing driving power supply comprises a working circuit and the voltage-reducing driving power supply as any one of the above, wherein the working circuit is connected with the power supply output end of the voltage-reducing driving power supply.
The present application also constructs a dual motor drive circuit including: the filter unit comprises a first motor driving unit used for being connected with a first motor, a second motor driving unit used for being connected with a second motor, and the voltage reduction driving power supply, wherein the first motor driving unit is connected with a second end of the filter unit in the voltage reduction driving power supply, and the second motor driving unit is connected with a power output end of the voltage reduction driving power supply.
The present application also contemplates an electronic device comprising a first motor, a second motor, and a dual motor drive circuit as described above, wherein the first motor is connected to the first motor drive unit and the second motor is connected to the second motor drive unit.
The voltage reduction driving power supply, the double-motor driving circuit and the electronic equipment have the following beneficial effects that: the circuit is simple and the cost is low.
Drawings
The present application will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic structural diagram of an embodiment of a step-down driving power supply according to the present application;
FIG. 2 is a schematic circuit diagram of an embodiment of a buck driving power supply of the present application;
FIG. 3 is a schematic structural diagram of an embodiment of a dual motor driving power supply according to the present application;
fig. 4 is a schematic circuit diagram of an embodiment of a dual motor driving power supply according to the present application.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present application, specific embodiments thereof will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a first embodiment of a step-down driving power supply of the present application includes: a power input terminal 110, a rectifying unit 120, a filtering unit 130, a voltage reducing unit 140, a power output terminal 150, a voltage detecting unit 160, a current sampling unit 170, and a controller 180; the power input terminal 110 is used for connecting a high-voltage alternating current input, and the power output terminal 150 is used for providing a high-voltage direct current output; the input end of the rectifying unit 120 is connected to the power input end 110, the output end of the rectifying unit 120 is connected to the first end of the filtering unit 130, the second end of the filtering unit 130 is connected to the first end of the voltage-reducing unit 140 and the power output end 150, the second end of the voltage-reducing unit 140 is connected to the current sampling unit 170 and the controller 180, the third end of the voltage-reducing unit 140 is connected to the controller 180, the first end of the voltage detecting unit 160 is connected to the power output end 150, and the second end of the voltage detecting unit 160 is connected to the controller 180. Specifically, the power input terminal 110 is used to connect a high-voltage ac input, which is a 380V three-phase ac input in common use. The three-phase ac is input to the rectifying unit 120, and rectified by the rectifying unit 120 to obtain a higher dc voltage, and the dc voltage is filtered by the filtering unit 130 to obtain a stable high-voltage output. The high voltage output is stepped down by the step-down unit 140, wherein the step-down unit 140 operates by receiving the control level output from the controller 180. The controller 180 receives the current sampling result of the current sampling unit 170 on the voltage dropping unit 140, and the controller 180 also receives the voltage detection result of the voltage detection unit 160 on the power output terminal 150. The peripheral circuits of the controller 180 are reasonably set so that the control level output by the controller 180 when receiving the current sampling result makes the voltage at the voltage output end be the target value. Wherein, in one embodiment, the power supply of the controller 180 may be provided by a dedicated power supply circuit.
As shown in fig. 2, in an embodiment, the voltage detection unit 160 includes: the circuit comprises a first voltage division circuit, a second voltage division circuit, a voltage stabilizing circuit and an optical coupling circuit; the first end of the first voltage division circuit and the first end of the second voltage division circuit are respectively connected with the power output end 150, the second end of the first voltage division circuit is connected with the first end of the optical coupling circuit, the third end of the first voltage division circuit is connected with the second end of the optical coupling circuit and the first end of the voltage stabilizing circuit, the second end of the second voltage division circuit is connected with the second end of the voltage stabilizing circuit, the third end of the second voltage division circuit and the third end of the voltage stabilizing circuit are connected with the ground of the power output end 150, the third end of the optical coupling circuit is connected with the controller 180, and the fourth end of the optical coupling circuit is connected with the ground of the filtering unit. Specifically, in the voltage detection unit 160, a first divided voltage is obtained by the first voltage dividing unit, and a second divided voltage is obtained by the second voltage dividing unit. When the output voltage of the power output terminal 150 does not reach the target voltage, that is, the output voltage is greater than the target voltage, the second divided voltage is higher than the threshold value of the voltage stabilizing circuit, the voltage stabilizing circuit works to generate a stable voltage at the second end of the optical coupling circuit, the stable voltage value is set to be smaller than the first divided voltage, the optical coupling circuit is switched on to work to output a current value, and the controller 180 outputs a control level to adjust the voltage reduction unit according to the current value until the output voltage of the power output terminal 150 is the target voltage. At this time, the second divided voltage is lower than the threshold value of the voltage stabilizing circuit, the voltage stabilizing circuit does not work, the optical coupling circuit outputs a smaller current value, and the controller 180 receives the smaller current value and maintains the current working state to ensure that the output of the power output terminal 150 is the target voltage, thereby finally realizing the output of the target voltage.
Optionally, the optical coupling circuit includes an optical coupling chip U2 and a resistor R11; the first pin of the optical coupling chip U2 is connected with the second end of the first voltage division unit, the second pin of the optical coupling chip U2 is connected with the third end of the first voltage division unit and the second end of the voltage stabilizing circuit, the third pin of the optical coupling chip U2 and the first end of the resistor R11 are connected with the ground of the filtering unit, the fourth pin of the optical coupling chip U2 and the second end of the resistor R11 are connected with the controller 180. Specifically, in the optical coupling circuit, one end of the transmitting end of the optical coupling chip U2 is connected with the first voltage division unit, the other end of the transmitting end of the optical coupling chip U2 is connected with the second voltage division unit, and the optical coupling circuit is switched on or switched off according to the voltage division of the first voltage division unit and the second voltage division unit. The receiving end of the optical coupling chip U2 is connected with the resistor R11 in parallel, the transmitting end of the optical coupling chip U2 triggers the receiving end to be conducted, and the resistor R11 bypasses the circuit.
Optionally, the voltage stabilizing circuit includes: a voltage stabilizing chip D8, a resistor R14 and a capacitor C5; the first pin of the voltage stabilizing chip D8 is connected to the first end of the resistor R14 and the second end of the second voltage dividing circuit, the second pin of the voltage stabilizing chip D8 is connected to the first end of the capacitor C5 and the second pin of the optocoupler chip U2, the second end of the capacitor C5 is connected to the second end of the resistor R14, and the third pin of the voltage stabilizing chip D8 is connected to the ground of the power output terminal 150. Specifically, in the voltage stabilizing circuit, the first end of the voltage stabilizing chip D8 is connected to the second voltage dividing unit, and is driven by the divided voltage of the second voltage dividing unit to operate. When the voltage stabilizing chip D8 works, a stable voltage is obtained at the first end of the voltage stabilizing chip D, so that the transmitting end of the optical coupling chip U2 is turned off. The voltage stabilizing chip D8 can be understood as a reference source, and is configured to collect the divided voltage of the second voltage dividing unit to finally control the flux of the optocoupler chip U2 according to the divided voltage.
Optionally, the first voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor, a first end of the first voltage-dividing resistor is connected to the power output terminal 150, a second end of the first voltage-dividing resistor is connected to a first pin of the optical coupling chip U2 and a first end of the second voltage-dividing resistor, and a second end of the second voltage-dividing resistor is connected to a second pin of the optical coupling chip U2 and a second pin of the voltage-stabilizing chip D8. Specifically, the first voltage dividing circuit may be formed by connecting a first voltage dividing resistor and a second voltage dividing resistor in series. The first voltage dividing resistor may be formed by combining a plurality of resistors or may be a single resistor, and for example, it may be formed by connecting a resistor R6 and a resistor R9 in series. The second divider resistor may be formed by combining a plurality of resistors or may be a single resistor, and may be formed by, for example, the resistor R13. The resistor R6, the resistor R9 and the resistor R13 are connected in series. The resistor R6 is connected with the power output end 150, and the resistor R13 is connected with the voltage stabilizing chip D8. A first divided voltage is generated at a series connection node of the resistor R9 and the resistor R13. The conduction amount of the optical coupler can be adjusted in a matched mode according to the partial pressure.
Optionally, the second voltage-dividing circuit includes a third voltage-dividing resistor and a fourth voltage-dividing resistor, a first end of the third voltage-dividing resistor is connected to the power output terminal 150, a second end of the third voltage-dividing resistor is connected to the first end of the resistor R14 and the first pin of the voltage-stabilizing chip D8, and a third end of the third voltage-dividing resistor is connected to the ground of the power output terminal 150. Specifically, the second voltage dividing circuit may be composed of a third voltage dividing resistor and a fourth voltage dividing resistor, and the third voltage dividing resistor may be formed by combining a plurality of resistors or may be a single resistor, and may be formed by connecting a resistor R7, a resistor R10, and a resistor R12 in series, for example. The fourth voltage dividing resistor may be a combination of a plurality of resistors or a single resistor, and may be, for example, a resistor R15. The resistor R7, the resistor R10, the resistor R12 and the resistor R15 are connected in series. Meanwhile, the resistor R7 is connected to the power output terminal 150, and the resistor R15 is connected to the ground of the power output terminal 150. The series connection node of the resistor R12 and the resistor R15 is connected to the voltage stabilization chip D8 and generates a second divided voltage. When the voltage at resistance R15 both ends is less than predetermineeing reference voltage when 2.5V, voltage regulation chip D8 control opto-coupler conductance grow, makes the electric current grow of exporting to the controller, and the big duty cycle of controller output makes opto-coupler conduction volume reduce when the voltage value at resistance R15 both ends is greater than predetermineeing reference voltage when 2.5V, makes the electric current of exporting to the controller diminish, and the little duty cycle of controller output.
Optionally, the filtering unit 130 includes a filtering inductor and a filtering capacitor, a first end of the filtering inductor is connected to the output end of the rectifying unit 120, a second end of the filtering inductor is connected to the positive electrode of the filtering capacitor, the first end of the voltage reducing unit 140, the power output end 150 and the controller 180, and the negative electrode of the filtering capacitor is grounded. Specifically, in the filtering unit 130, the filter inductor includes an inductor L1, and the filter capacitor includes a capacitor E2 and a capacitor E3. The capacitor E2 and the capacitor E3 are connected in series. In addition, the filter capacitor can also comprise a plurality of capacitors.
Optionally, the rectifying unit 120 may include a diode D1, a diode D2, a diode D3, a diode D5, a diode D6, and a diode D7, an anode of the diode D1 is connected to the U-phase of the three-phase ac input and a cathode of the diode D5, an anode of the diode D2 is connected to the V-phase of the three-phase ac input and a cathode of the diode D6, an anode of the triode D3 is connected to the W-phase of the three-phase ac input and a cathode of the diode D7, cathodes of the diode D1, the diode D2, and the diode D3 are connected to the first end of the inductor L1, and anodes of the diode D5, the diode D6, and the diode D7 are grounded.
Optionally, the voltage dropping unit 140 includes a diode D4, an inductor L2, a resistor R2, and a transistor Q1; the cathode of the diode D4 is connected to the second end of the filter inductor, the anode of the diode D4 is connected to the first end of the inductor L2 and the collector of the transistor Q1, the second end of the inductor L2 is connected to the ground of the power output terminal 150, the emitter of the transistor Q1 is connected to the current sampling unit 170, the controller 180 and the first end of the resistor R2, and the base of the transistor Q1 is connected to the second end of the resistor R2 and the controller 180. Specifically, in the voltage dropping unit 140, the base of the transistor Q1 receives the control level output by the controller 180, and is used to control the duty ratio of the transistor Q1. The resistor R2 is used to prevent the transistor Q1 from being turned on by mistake.
Optionally, the current sampling unit 170 includes a sampling resistor RS3, a resistor R8 and a capacitor C3, the first end of the sampling resistor RS3 is connected to the emitter of the transistor Q1 and the first end of the resistor R8, the second end of the resistor R8 is connected to the controller and the first end of the capacitor C3, and the second end of the sampling resistor RS3 and the second end of the capacitor C3 are connected to the ground of the filtering unit. And the conduction current of the triode Q1 is collected through the resistor RS 3. The current sampling unit 170 may further include an RC filter circuit to filter the current signal. Wherein the RC filter circuit comprises a resistor R8 and a capacitor C3.
Optionally, the controller 180 includes a PWM control chip U1, a resistor R4, and a resistor R5; the first pin of the PWM control chip U1 is grounded, the second pin of the PWM control chip U1 is connected with the second end of the filter inductor through a resistor R4, the third pin of the PWM control chip U1 is connected with the fourth pin of the optocoupler chip U2, the fourth pin of the PWM control chip U1 is connected with the second end of a resistor R8, the fifth pin of the PWM control chip U1 is connected with a power supply, and the sixth pin of the PWM control chip U1 is connected with the base of the triode Q1 through a resistor R5. Specifically, the controller 180 includes a PWM control chip U1 and peripheral circuits thereof. The second pin of the PWM control chip U1 is connected to the power output terminal 150 via a resistor R4. Namely, the resistor R4 serves as a starting resistor of the PWM control chip U1. The second pin of the PWM control chip U1 is also grounded via a capacitor C2. And a sixth pin of the PWM control chip U1 is connected to the base electrode of the triode Q1 through a resistor R5, and the output control level controls the triode Q1 to work. The PWM controller U1 controls the duty cycle of the PWM signal of its output at the OUT pin according to the actual value of the voltage feedback obtained from its FB pin and the value of the current stepped down obtained from the CS pin.
Optionally, the power output terminal 150 may be provided with a connector CN1 for connecting the working circuit, and a capacitor E1 and a resistor R1 for filtering the output signal. The method is used for preventing the problems of over-quick voltage rise and over-large overshoot in the circuit power-on process and the control chip U1 starting process.
An electronic device of the present application includes: an operating circuit and a buck drive power supply as in any above, wherein the operating circuit is connected to the power supply output 150 of the buck drive power supply. Namely, in the electronic device, the operating circuit is supplied with power by the step-down driving power supply.
In the step-down driving power supply, on the basis of the original high-voltage direct current, rectification and a PFC circuit are not required to be carried out again to obtain a stable high-power direct-current voltage as a boost circuit, and the ground of the step-down circuit and the ground of the bus voltage are in the same ground, so that a switching power supply is not required to be output independently to the step-down circuit.
As shown in fig. 3, a two-motor drive circuit of the present application includes: the filter unit comprises a first motor driving unit 210 for connecting a first motor, a second motor driving unit 220 for connecting a second motor, and a step-down driving power supply as any one of the above, wherein the first motor driving unit 210 is connected to a second end of the filter unit 130 in the step-down driving power supply, and the second motor driving unit 220 is connected to the power output end 150 of the step-down driving power supply. Specifically, in the step-down driving power supply, the input voltage of the power input terminal 110 is rectified by the rectifying unit 120 and filtered by the filtering unit 130, and then directly supplies power to the first motor driving unit 210. That is, the filter unit 130 outputs a large high voltage to supply power to the motor requiring high voltage driving. In one embodiment, as shown in fig. 4, in the first motor driving unit, an H-bridge circuit composed of IGBT tube Q11, IGBT tube Q12, IGBT tube Q13, IGBT tube Q14, IGBT tube Q15, and IGBT tube Q16 drives first motor M1 to operate. The first motor M1 may be a high power motor, such as a compressor. In the step-down driving power supply, the high voltage output by the filtering unit 130 is processed by the step-down unit 140 and then output to the second driving unit 220 through the power output terminal 150. And the sampling resistor RS1 can be used for carrying out current on the first motor so as to realize output power control and overcurrent protection. In one embodiment, as shown in fig. 4, in the second motor driving unit 220, an H-bridge circuit is formed by IGBT pipe Q21, IGBT pipe Q22, IGBT pipe Q23, IGBT pipe Q24, and IGBT pipe Q26 to drive the second motor M1 to operate. The second electric machine M2 may be a relatively low power electric machine, such as a fan. And the sampling resistor RS2 can be used for carrying out current on the first motor so as to realize output power control and overcurrent protection.
In addition, the electronic device of the present application includes a first motor, a second motor, and the dual-motor driving circuit as above, wherein the first motor is connected to the first motor driving unit, and the second motor is connected to the second motor driving unit. In other words, in some electronic devices including a plurality of motors, different motors can be powered through the above dual-motor driving circuit. The electronic device may be a refrigerator, and the first motor driving unit 210 supplies power to a refrigeration compression motor (corresponding to the first motor M1) in the refrigerator, and the power supply supplies power to a fan (corresponding to the second motor M2) in the refrigerator through the second driving unit 220. Through the double-motor driving circuit, the problem that three phases are unbalanced caused by the fact that the original high-power fan is powered by a single-phase power supply can be solved, the problem that the cost is higher due to the fact that three-phase buses are directly powered is solved, and meanwhile, the problem that the switching tube needs to be powered independently in a Buck circuit is solved.
It is to be understood that the above examples merely represent preferred embodiments of the present application, and that the description thereof is more specific and detailed, but not construed as limiting the scope of the claims; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the concept of the present application, which all belong to the protection scope of the present application; therefore, all equivalent changes and modifications made within the scope of the claims of the present application shall fall within the scope of the claims of the present application.
Claims (12)
1. A step-down driving power supply, comprising: the power supply comprises a power supply input end, a rectifying unit, a filtering unit, a voltage reducing unit, a power supply output end, a voltage detecting unit, a current sampling unit and a controller;
the power supply input end is used for connecting a high-voltage alternating current input, and the power supply output end is used for providing high-voltage direct current output;
the input of rectification unit is connected the power input end, the output of rectification unit is connected the first end of filtering unit, the second end of filtering unit is connected the first end of step-down unit with the power output end, the second end of step-down unit is connected the current sampling unit, the third end of step-down unit is connected the controller, the first end of voltage detection unit is connected the power output end, the second end of voltage detection unit is connected the controller.
2. The step-down driving power supply according to claim 1, wherein the voltage detection unit comprises: the circuit comprises a first voltage division circuit, a second voltage division circuit, a voltage stabilizing circuit and an optical coupling circuit;
the first end of the first voltage division circuit and the first end of the second voltage division circuit are respectively connected with the power output end, the second end of the first voltage division circuit is connected with the first end of the optocoupler circuit, the third end of the first voltage division circuit is connected with the second end of the optocoupler circuit and the first end of the voltage stabilizing circuit, the second end of the second voltage division circuit is connected with the second end of the voltage stabilizing circuit, the third end of the second voltage division circuit and the third end of the voltage stabilizing circuit are connected with the ground of the power output end, the third end of the optocoupler circuit is connected with the controller, and the fourth end of the optocoupler circuit is connected with the ground of the filter unit.
3. The step-down driving power supply according to claim 2, wherein the optical coupling circuit comprises an optical coupling chip U2 and a resistor R11;
the first pin of the optical coupling chip U2 is connected with the second end of the first voltage division unit, the second pin of the optical coupling chip U2 is connected with the third end of the first voltage division unit and the second end of the voltage stabilizing circuit, the third pin of the optical coupling chip U2 and the first end of the resistor R11 are connected with the ground of the filtering unit, and the fourth pin of the optical coupling chip U2 and the second end of the resistor R11 are connected with the controller.
4. The buck drive power supply of claim 3, wherein the voltage regulator circuit comprises: a voltage stabilizing chip D8, a resistor R14 and a capacitor C5;
the first pin of voltage stabilization chip D8 is connected the first end of resistance R14 with the second end of second divider circuit, voltage stabilization chip D8's second pin is connected electric capacity C5's first end with the second pin of opto-coupler chip U2, electric capacity C5's second end is connected resistance R14's second end, voltage stabilization chip D8's third pin is connected the ground of power output end.
5. The step-down driving power supply according to claim 4,
the first voltage division circuit comprises a first voltage division resistor and a second voltage division resistor, wherein a first end of the first voltage division resistor is connected with the power output end, a second end of the first voltage division resistor is connected with a first pin of the optical coupling chip U2 and a first end of the second voltage division resistor, and a second end of the second voltage division resistor is connected with a second pin of the optical coupling chip U2 and a second pin of the voltage stabilization chip D8; and/or
The second voltage division circuit comprises a third voltage division resistor and a fourth voltage division resistor, wherein a first end of the third voltage division resistor is connected with the power output end, a second end of the third voltage division resistor is connected with a first end of the resistor R14 and a first pin of the voltage stabilization chip D8, and a third end of the third voltage division resistor is connected with the ground of the power output end.
6. The buck driving power supply according to claim 3, wherein the filter unit includes a filter inductor and a filter capacitor, a first end of the filter inductor is connected to the output end of the rectifier unit, a second end of the filter inductor is connected to the positive electrode of the filter capacitor, the first end of the buck unit, the power output end and the controller, and a negative electrode of the filter capacitor is grounded.
7. The buck driving power supply according to claim 6, wherein the buck unit includes a diode D4, an inductor L2, a resistor R2, and a transistor Q1; the negative pole of diode D4 is connected the second end of filter inductance, diode D4's positive pole is connected inductance L2's first end with triode Q1's collecting electrode, inductance L2's second end is connected power output end's ground, triode Q1's projecting pole is connected the current sampling unit the controller with resistance R2's first end, triode Q1's base is connected resistance R2's second end with the controller.
8. The buck driving power supply according to claim 7, wherein the current sampling unit includes a sampling resistor RS3, a resistor R8 and a capacitor C3, a first end of the sampling resistor RS3 is connected to the emitter of the transistor Q1 and a first end of the resistor R8, a second end of the resistor R8 is connected to the controller and a first end of the capacitor C3, and a second end of the sampling resistor RS3 and a second end of the capacitor C3 are connected to the ground of the filtering unit.
9. The buck driving power supply according to claim 8, wherein the controller includes a PWM control chip U1, a resistor R4, and a resistor R5;
PWM control chip U1's first pin ground connection, PWM control chip U1's second pin warp resistance R4 connects filter inductance's second end, PWM control chip U1's third pin is connected opto-coupler chip U2's fourth pin, PWM control chip U1's fourth pin is connected resistance R8's second end, a power supply is connected to PWM control chip U1's fifth pin, PWM control chip U1's sixth pin warp resistance R5 connects triode Q1's base.
10. An electronic device, comprising: the buck driving power supply of any one of claims 1 to 9 and an operating circuit, wherein the operating circuit is connected to a power supply output of the buck driving power supply.
11. A dual motor drive circuit, comprising: a first motor drive unit for connection to a first motor, a second motor drive unit for connection to a second motor, and a step-down drive power supply as claimed in any one of claims 1 to 9; the first motor driving unit is connected with a second end of the filtering unit in the voltage reduction driving power supply, and the second motor driving unit is connected with a power output end of the voltage reduction driving power supply.
12. An electronic device comprising a first motor, a second motor, and the dual motor drive circuit of claim 11, wherein the first motor is connected to the first motor drive unit, and the second motor is connected to the second motor drive unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222759745.9U CN218733926U (en) | 2022-10-19 | 2022-10-19 | Step-down driving power supply, double-motor driving circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222759745.9U CN218733926U (en) | 2022-10-19 | 2022-10-19 | Step-down driving power supply, double-motor driving circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218733926U true CN218733926U (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222759745.9U Active CN218733926U (en) | 2022-10-19 | 2022-10-19 | Step-down driving power supply, double-motor driving circuit and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN218733926U (en) |
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2022
- 2022-10-19 CN CN202222759745.9U patent/CN218733926U/en active Active
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