Output voltage regulating circuit for motor driving device and motor driving device

Abstract

The utility model discloses an output voltage regulating circuit for a motor driving device, the output voltage regulating circuit comprises a voltage reduction circuit, an input voltage detection circuit, a voltage division regulating circuit and a voltage division circuit, the voltage reduction circuit is connected with a power supply input end, and the power supply input end inputs working voltage of the motor driving device or burning voltage of a burning circuit; the input end of the input voltage detection circuit is connected with the power input end, the output end of the input voltage detection circuit is connected with the control end of the voltage division adjusting circuit, and the voltage division adjusting circuit is connected with the voltage division circuit. The input end of the voltage division circuit is connected with the voltage output end of the step-down circuit, and the output end of the voltage division circuit is connected with the voltage feedback end of the step-down circuit; when the input voltage is switched between the working voltage and the burning voltage, the voltage division adjusting circuit adjusts the voltage division ratio of the voltage division circuit so that the voltage reduction circuit can feed back and adjust the direct current output voltage of the voltage output end according to the voltage division ratio. According to the utility model, the output voltage can meet the burning requirement and the normal working requirement.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially, it relates to a kind of output voltage regulating circuit and motor drive device for motor drive device. BACKGROUND

[0002] MCU chip is a programmable unit, needs to write software, generally software is burned into, MCU chip can reach the required application function.

[0003] The existing burning method has the burning using single MCU, as shown in Figure Figure 1 , MCU is connected with burner using VCC / GND / SWCLK / SWDIO 4 interfaces;Or as shown in Figure Figure 2 , after MCU is welded on PCB, 5V / GND / SWCLK / SWDIO 4 interfaces are additionally pulled out to burn.The shortcomings of the above two burning methods are that when MCU chip is made into product, for example, brushless DC motor product, the burning interface connected with burner in product interior when burning MCU chip, if needing to update software again, cannot be immediately burned again, only product is disassembled, and burning action is performed again, more working hours are spent, and some products are glued with moisture-proof glue, so that product cannot be disassembled, at this time, product can only be scrapped.

[0004] In order to solve the above problems, four-wire burning function is developed in market at present, as shown in Figure Figure 3 And Figure Figure 4 , external interface terminal VIN / PWM IN / FG OUT / GND of product is directly used to carry out disassembly-free burning.The method solves the problem of repeated burning of product, but the method is only applicable to the product below 20VDC.And for high-voltage product, such as AI server, its cooling fan or water pump is basically 48VDC or 54VDC input voltage, as shown in Figure Figure 5 , it has DCDC step-down circuit inside, and 48VDC or 54VDC high voltage is reduced to 12VDC or 15VDC to provide motor drive chip, but because burner can only provide 5VDC power supply, cannot provide normal voltage to product to carry out burning action, as shown in Figure Figure 6 , it is actual burning tester result, DCDC chip output is only similar to triangular wave, peak voltage is about 4.8V, and burning action cannot be carried out.

[0005] If external terminal burning action of high-voltage product needs to be carried out, additional power supply must be used to provide additional power supply, so that additional stable power supply can be provided when burning, as shown in Figure Figure 7 . But the success of the additional device will increase, and the voltage of power supply during burning needs to be set, and the complexity of burning action is also increased.

[0006] Therefore, it is urgent to solve the above problems. Novelty content

[0007] The utility model discloses a first purpose is to provide a kind of output voltage regulating circuit for motor drive device can satisfy burning demand also can satisfy normal work demand.

[0008] The second purpose of the utility model is to provide a kind of motor drive device.

[0009] To achieve the above object, the utility model discloses an output voltage regulating circuit for motor drive device, the output voltage regulating circuit includes buck circuit, input voltage detection circuit, voltage division regulating circuit and voltage division circuit, wherein,

[0010] The power input end is connected to the buck circuit, and the power input end inputs the working voltage of the motor drive device or the burning voltage of the burning circuit;

[0011] The input end of the input voltage detection circuit is connected to the power input end, the output end of the input voltage detection circuit is connected to the control end of the voltage division regulating circuit, and the voltage division regulating circuit is connected to the voltage division circuit;

[0012] The input end of the voltage division circuit is connected to the voltage output end of the buck circuit, and the output end of the voltage division circuit is connected to the voltage feedback end of the buck circuit;

[0013] When the input voltage of the power input end is switched between the working voltage and the burning voltage, the voltage division regulating circuit adjusts the voltage division ratio of the voltage division circuit according to the switched input voltage, so that the buck circuit adjusts the direct current output voltage of the voltage output end according to the voltage division ratio feedback.

[0014] Optionally, when the input voltage is the burning voltage, the voltage division ratio is adjusted to a first ratio, and the direct current output voltage is adjusted to a first voltage;

[0015] When the input voltage is the working voltage, the voltage division ratio is adjusted to a second ratio, and the direct current output voltage is adjusted to a second voltage, the first ratio is greater than the second ratio, and the first voltage is less than the second voltage.

[0016] Optionally, the input voltage detection circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the power input end, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is grounded, and the connection point of the first resistor and the second resistor is connected to the control end of the voltage division regulating circuit.

[0017] Optionally, the voltage dividing circuit comprises a fixed resistance unit and an adjustable resistance unit connected in series, and the voltage dividing adjusting circuit comprises a switch circuit, when the switch circuit is turned on, part of the resistance in the adjustable resistance unit is disabled.

[0018] Optionally, the fixed resistance unit comprises a third resistance, the adjustable resistance unit comprises a fourth resistance and a fifth resistance, the third resistance, the fourth resistance and the fifth resistance are connected in series, a first end of the third resistance is connected to the voltage output end, the fifth resistance is grounded, a connection point of the third resistance and the fourth resistance is connected to the voltage feedback end, and a connection point of the fourth resistance and the fifth resistance is a resistance adjusting node and is connected to the switch circuit.

[0019] Optionally, the switch circuit comprises a power switch tube, a gate of the power switch tube is connected to an output end of the input voltage detection circuit, a drain of the power switch tube is connected to the resistance adjusting node, and a source of the power switch tube is grounded.

[0020] Optionally, the switch circuit comprises a comparator and a power switch tube, a non-inverting input end of the comparator is connected to an output end of the input voltage detection circuit, an inverting input end of the comparator inputs a reference voltage, an output end of the comparator is connected to a gate of the power switch tube, a drain of the power switch tube is connected to the resistance adjusting node, and a source of the power switch tube is grounded.

[0021] Optionally, the voltage reducing circuit is integrated into a DCDC chip.

[0022] Optionally, a voltage output end of the DCDC chip is connected to an inductor, and the DC output voltage is output through the inductor.

[0023] Optionally, the output voltage adjusting circuit further comprises a diode, a positive electrode of the diode is connected to the power input end, and a negative electrode of the diode is connected to the voltage reducing circuit.

[0024] Based on the same concept, the utility model discloses a motor drive device, including output voltage circuit as described above, still include motor drive chip and motor, voltage output end of voltage reducing circuit is connected motor drive chip, provides DC output voltage for motor drive chip, and motor drive chip drives motor.

[0025] Optionally, the modulation burning circuit is connected to the motor drive chip through a clock signal line and a data signal line, and a grounding end of the modulation burning circuit is connected to a grounding end of the motor drive chip.

[0026] Beneficial effects: compared with the prior art, the utility model has the advantages that when the input voltage of the power input end switches between the working voltage and the burning voltage, the voltage dividing adjusting circuit adjusts the voltage dividing ratio of the voltage dividing circuit according to the switched input voltage, so that the voltage dividing circuit feeds back the direct current output voltage of the voltage output end according to the voltage dividing ratio; the direct current output voltage of the utility model can be switched according to the input voltage, so that the motor driving device can be operated for software burning and can meet the voltage required for normal working of the motor driving device without disassembly. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the principle of single MCU burning in the prior art;

[0028] Figure 2 It is a schematic diagram of the principle of MCU burning on PCB in the prior art;

[0029] Figure 3 It is a schematic diagram of the principle of four-wire burning of products in the prior art;

[0030] Figure 4 It is a schematic diagram of the principle of four-wire burning of motor driving chip products in the prior art;

[0031] Figure 5 It is a schematic diagram of the principle of four-wire burning of high-voltage products in the prior art;

[0032] Figure 6 It is a test result diagram of the burner when four-wire burning of high-voltage products in the prior art;

[0033] Figure 7 It is a schematic diagram of the principle of four-wire burning of high-voltage products under external power supply in the prior art;

[0034] Figure 8 It is a structural schematic diagram of the output voltage adjusting circuit in the utility model;

[0035] Figure 9 It is a schematic diagram of the principle of the output voltage adjusting circuit in the utility model Figure 1 ;

[0036] Figure 10 It is a schematic diagram of the principle of the output voltage adjusting circuit in the utility model Figure 2 ;

[0037] Figure 11 It is a schematic diagram of the principle of four-wire burning of motor driving chip products in the utility model;

[0038] Figure 12 It is a test result diagram of the output voltage in the utility model. DETAILED DESCRIPTION

[0039] As Figure 8 The utility model provides an output voltage adjusting circuit for motor drive device, output voltage adjusting circuit includes voltage reducing circuit, input voltage detection circuit, voltage division adjusting circuit and voltage division circuit, power input end input motor drive device's working voltage or the burning voltage of burning circuit, the input end of input voltage detection circuit is connected power input end, the output end of input voltage detection circuit is connected voltage division adjusting circuit's control end, voltage division adjusting circuit is connected with voltage division circuit, the input end of voltage division circuit is connected voltage output end of voltage reducing circuit, voltage division circuit's output end connects voltage feedback end of voltage reducing circuit, when the input voltage of power input end switches between working voltage and burning voltage, voltage division adjusting circuit adjusts voltage division ratio of voltage division circuit according to the input voltage after switching, to make voltage reducing circuit according to voltage division ratio feedback voltage output end's direct current output voltage.

[0040] Voltage reducing circuit reduces the high voltage of input voltage of power input end to the voltage required for subsequent circuit use, input voltage detection circuit is used for detecting the input voltage of power input end, according to the input voltage after switching of power input end to control voltage division adjusting circuit, voltage division adjusting circuit adjusts voltage division ratio of voltage division circuit according to the input voltage after switching, voltage division circuit feedback voltage division ratio to voltage reducing circuit, voltage reducing circuit according to voltage division ratio feedback voltage output end's direct current output voltage.

[0041] Voltage reducing circuit's inside is generally provided with feedback adjusting module, feedback adjusting module receives the feedback voltage Vout of direct current output voltage Vout k, and is provided with a reference voltage Vref, wherein, k is the voltage division ratio of voltage division circuit, and the output voltage of voltage reducing circuit is adjusted by the comparison result of feedback voltage Vout k and reference voltage Vref, when output voltage is stable, Vout k=Vref, namely the direct current output voltage of voltage reducing circuit is about Vref k. Since voltage division ratio k can be switched according to input voltage, so the direct current output voltage can be switched according to input voltage, so that motor drive device can be operated in software burning operation without disassembly, and the voltage required for normal work of motor drive device can be met.

[0042] In one embodiment, when the input voltage is the programming voltage, the voltage division ratio is adjusted to a first ratio k1, and the DC output voltage is adjusted to a first voltage to facilitate software programming. When the input voltage is the operating voltage, the voltage division ratio is adjusted to a second ratio k2, and the DC output voltage is adjusted to a second voltage to facilitate the normal operation of the motor drive device. That is, when the input voltage is the programming voltage, the voltage division ratio k of the voltage divider circuit is k1, and the DC output voltage is Vref / k1; when the input voltage is the operating voltage, the voltage division ratio k of the voltage divider circuit is k2, and the DC output voltage is Vref / k2. In this embodiment, since the first ratio k1 is greater than the second ratio k2, the first voltage is less than the second voltage.

[0043] Specifically, such as Figure 9 As shown, in one embodiment, the input voltage detection circuit includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is connected to the power input terminal VIN, and the other end of the first resistor R1 is connected to one end of the second resistor R2. The other end of the second resistor R2 is grounded, and the connection point of the first resistor R1 and the second resistor R2 is connected to the control terminal of the voltage divider adjustment circuit. In other embodiments, other existing voltage detection circuits can also be used. The input voltage detection circuit can detect the input voltage at the power input terminal, which facilitates the subsequent voltage divider adjustment circuit to adjust the voltage division ratio of the voltage divider circuit according to different input voltages.

[0044] Specifically, in one embodiment, the voltage divider circuit includes a fixed resistor unit and an adjustable resistor unit connected together. The voltage divider adjustment circuit includes a switching circuit, which, when turned on, disables a portion of the resistors in the adjustable resistor unit. Figure 9 As shown, the fixed resistor unit includes a third resistor R3, and the adjustable resistor unit includes a fourth resistor R4 and a fifth resistor R5. The third resistor R3, fourth resistor R4, and fifth resistor R5 are connected sequentially. The first end of the third resistor R3 is connected to the voltage output terminal SW of the step-down circuit, and the fifth resistor R5 is grounded. The connection point between the third resistor R3 and the fourth resistor R4 is connected to the voltage feedback terminal FB of the step-down circuit. The connection point between the fourth resistor R4 and the fifth resistor R5 is the resistance adjustment point, which is connected to the switching circuit. Further, the voltage output terminal SW of the step-down circuit is connected to an inductor, which outputs a DC output voltage. The first end of the third resistor R3 is connected to the voltage output terminal SW of the step-down circuit through this inductor. In this embodiment, when the switching circuit is off, the voltage division ratio of the voltage divider circuit is (R4+R5) / (R3+R4+R5). When the switching circuit is on, resistor R5 is short-circuited and does not work, and the voltage division ratio of the voltage divider circuit is R4 / (R3+R4). In other embodiments, the fixed resistor unit may also include one or more resistors other than the third resistor R3, and the adjustable resistor unit may also include two or more resistors, or may employ a structure such as a variable resistor.

[0045] In one embodiment, the switch circuit includes a power switch Q1, which can be a N-channel MOSFET, or other power device such as a triode. The gate of the power switch Q1 is connected to the output VG of the input voltage detection circuit, i.e. the gate of the power switch Q1 is connected to the connection point of the first resistor R1 and the second resistor R2, the drain of the power switch Q1 is connected to the resistance adjustment node, i.e. the drain of the power switch Q1 is connected to the connection point of the fourth resistor R4 and the fifth resistor R5, and the source of the power switch Q1 is grounded.

[0046] As shown in FIG. 1, in one embodiment, the switch circuit includes a comparator and a power switch Q1, the non-inverting input of the comparator is connected to the output VG of the input voltage detection circuit, the inverting input of the comparator inputs a reference voltage, the output of the comparator is connected to the gate of the power switch Q1, the drain of the power switch Q1 is connected to the resistance adjustment node, and the source of the power switch Q1 is grounded. When the voltage at the VG end is less than the reference voltage input at the inverting input of the comparator, the comparator outputs a low level, and the power switch Q1 is not sufficient to be turned on; when the voltage at the VG end is greater than or equal to the reference voltage input at the inverting input of the comparator, the comparator outputs a high level, and the power switch Q1 is turned on. When the input voltage is the programming voltage, the comparator outputs a low level, and when the input voltage is the working voltage, the comparator outputs a high level. Figure 10 For example, the reference voltage of the comparator is 2V, and in other specific embodiments, the value of the reference voltage can be set according to the turn-on threshold of the power switch Q1. Figure 10 In another embodiment, the switch circuit includes an operational amplifier and a power switch Q1, the non-inverting input of the operational amplifier is connected to the output VG of the input voltage detection circuit, the inverting input of the operational amplifier inputs a reference voltage, the output of the operational amplifier is connected to the gate of the power switch Q1, the drain of the power switch Q1 is connected to the resistance adjustment node, and the source of the power switch Q1 is grounded. The operational amplifier amplifies the difference voltage between the voltage at the VG end and the reference voltage to adjust the turn-on degree of the power switch Q1. When the input voltage is the programming voltage, the voltage output by the operational amplifier cannot turn on the power switch Q1, and when the input voltage is the working voltage, the voltage output by the operational amplifier can turn on the power switch Q1.

[0047]

[0048] ​In other embodiments, the switching circuit can also employ a selection switch, the adjustable resistance unit in the voltage dividing circuit can include a first adjustable resistance branch and a second adjustable resistance branch, when the input voltage is the programming voltage of the programmer, the selection switch selects the first adjustable resistance branch to be conductive, and when the input voltage is the working voltage of the product, the selection switch selects the second adjustable resistance branch to be conductive. The resistance value of the first adjustable resistance branch is smaller than that of the second adjustable resistance branch, so that the voltage dividing ratio of the voltage dividing circuit when the first adjustable resistance branch is conductive is greater than the voltage dividing ratio of the voltage dividing circuit when the second adjustable resistance branch is conductive.

[0049] Specifically, in one embodiment, the step-down circuit can be integrated into a DCDC chip, the voltage output end SW of the DCDC chip is connected with the inductor, the DC output voltage is output through the inductor, the boost output end BST of the DCDC chip is connected with the voltage output end SW of the DCDC chip through the capacitor, and the voltage feedback end FB of the DCDC chip receives the voltage dividing voltage of the voltage dividing circuit.

[0050] Specifically, in one embodiment, the output voltage regulating circuit further includes a diode, the anode of the diode is connected with the power input end, and the cathode of the diode is connected with the step-down circuit.

[0051] Please refer to Figure 9 and Figure 12 for specific examples. When the programming circuit is used for programming operation, the voltage of the power input end VIN is 5VDC, the voltage at the connection point of the first resistor R1 and the second resistor R2, i.e. the output end VG of the input voltage detection circuit, cannot make the power switch tube Q1 conductive, at this time, the voltage dividing voltage obtained by the voltage feedback end FB of the DCDC chip is the voltage dividing voltage of the third resistor R3, the fourth resistor R4 and the fifth resistor R5, the voltage dividing ratio of the voltage dividing circuit is k1=(R4+R5) / (R3+R4+R5), and the calculation formula of the DC output voltage is Vref(R3+R4+R5) / (R4+R5), wherein Vref is the reference voltage in the feedback and regulation module of the step-down circuit; at this time, the obtained DC output voltage is about 5V, and the voltage is stable. The obtained DC output voltage is the voltage required for software programming operation.

[0052] When the product is working normally, the input voltage VIN of the power input end is increased, the voltage at the connection point of the first resistor R1 and the second resistor R2, i.e. the output end VG of the input voltage detection circuit, is sufficient to make the power switch tube Q1 conductive, at this time, the fifth resistor R5 does not work, the voltage dividing voltage obtained by the voltage feedback end FB of the DCDC chip is the voltage dividing voltage of the third resistor R3 and the fourth resistor R4, the voltage dividing ratio of the voltage dividing circuit is k2=R4 / (R3+R4), and the calculation formula of the DC output voltage is Vref(R3+R4) / R4, at this time, the obtained DC output voltage is the voltage required for the motor driving device to work normally, and Vref is the reference voltage in the feedback and regulation module of the step-down circuit.

[0053] In some embodiments, if R1=500K, R2=100K, R3=280K, R4=20K, R5=33.3K, when the power input end VIN=5V, the output end VG voltage of the input voltage detection circuit is 0.8V, the power switch tube Q1 is insufficient to be turned on, the reference voltage Vref in the feedback regulation module of the DCDC chip is 0.8V, the direct current output voltage calculated according to k1 is about 4.8V, and the output voltage VOUT detected by the oscilloscope is also about 4.8V, which is close to the ideal voltage 5V when the burning work is normally carried out. Figure 12 It can be seen that the actual value of the output voltage VOUT detected by the oscilloscope is also about 4.8V, which is close to the ideal voltage 5V when the burning work is normally carried out; when the power input end VIN=31V, the output end VG voltage of the input voltage detection circuit is 3.3V, the power switch tube Q1 is turned on, the fifth resistor R5 does not work, the direct current output voltage calculated according to k2 is about 12V.

[0054] As shown in Figure 11 The utility model discloses still a kind of motor driving device, including the output voltage regulating circuit 1, still including motor driving chip 2 and motor 3, the voltage output end of voltage reduction circuit is connected motor driving chip 2, for motor driving chip 2 provides direct current output voltage, motor driving chip 2 drives motor 3.Modulation burning circuit 4 is connected with motor driving chip 2 by clock signal line and data signal line, and the ground end of modulation burning circuit 4 is connected with the ground end of motor driving chip 2.When input voltage is at working voltage, modulation burning circuit 4 functions as modulation circuit, facilitate motor driving chip 2 normal work use;When input voltage is burning voltage, modulation burning circuit 4 functions as burning circuit, facilitate software to carry out burning operation.

[0055] The above-mentioned is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made in the utility model's conception, using the utility model specification and the attached drawing contents or direct / indirect application in other related technical fields are included in the patent protection range of the utility model.

Claims

1. An output voltage regulating circuit for a motor drive apparatus, characterized by comprising: The output voltage regulating circuit comprises a step-down circuit, an input voltage detecting circuit, a voltage dividing regulating circuit and a voltage dividing circuit, wherein, The step-down circuit is connected with a power input end, and the power input end inputs a working voltage of the motor driving device or a burning voltage of a burning circuit; The input end of the input voltage detecting circuit is connected with the power input end, the output end of the input voltage detecting circuit is connected with the control end of the voltage dividing regulating circuit, and the voltage dividing regulating circuit is connected with the voltage dividing circuit; The input end of the voltage dividing circuit is connected with the voltage output end of the step-down circuit, and the output end of the voltage dividing circuit is connected with the voltage feedback end of the step-down circuit; When the input voltage of the power input end is switched between the working voltage and the burning voltage, the voltage dividing regulating circuit adjusts the voltage dividing ratio of the voltage dividing circuit according to the switched input voltage, so that the step-down circuit adjusts the direct current output voltage of the voltage output end according to the voltage dividing ratio feedback.

2. The output voltage regulating circuit according to claim 1, wherein, When the input voltage is the burning voltage, the voltage dividing ratio is adjusted to a first ratio, and the direct current output voltage is adjusted to a first voltage; When the input voltage is the working voltage, the voltage dividing ratio is adjusted to a second ratio, and the direct current output voltage is adjusted to a second voltage, the first ratio is greater than the second ratio, and the first voltage is less than the second voltage.

3. The output voltage regulation circuit of claim 1, wherein, The input voltage detecting circuit comprises a first resistor and a second resistor, one end of the first resistor is connected with the power input end, the other end of the first resistor is connected with one end of the second resistor, the other end of the second resistor is grounded, and the connection point of the first resistor and the second resistor is connected with the control end of the voltage dividing regulating circuit.

4. The output voltage regulation circuit of claim 1, wherein, The voltage dividing circuit comprises a fixed resistor unit and an adjustable resistor unit connected in sequence, and the voltage dividing regulating circuit comprises a switch circuit, when the switch circuit is turned on, part of the resistors in the adjustable resistor unit is disabled.

5. The output voltage regulating circuit of claim 4, wherein, The fixed resistor unit comprises a third resistor, the adjustable resistor unit comprises a fourth resistor and a fifth resistor, the third resistor, the fourth resistor and the fifth resistor are connected in sequence, the first end of the third resistor is connected with the voltage output end, the fifth resistor is grounded, the connection point of the third resistor and the fourth resistor is connected with the voltage feedback end, and the connection point of the fourth resistor and the fifth resistor is a resistor adjusting node and is connected with the switch circuit.

6. The output voltage regulating circuit of claim 5, wherein, The switch circuit comprises a power switch tube, the gate of the power switch tube is connected with the output end of the input voltage detecting circuit, the drain of the power switch tube is connected with the resistor adjusting node, and the source of the power switch tube is grounded.

7. The output voltage regulating circuit of claim 5, wherein, The switch circuit comprises a comparator and a power switch tube, the non-inverting input end of the comparator is connected with the output end of the input voltage detecting circuit, the inverting input end of the comparator inputs a reference voltage, the output end of the comparator is connected with the gate of the power switch tube, the drain of the power switch tube is connected with the resistor adjusting node, and the source of the power switch tube is grounded.

8. The output voltage regulating circuit of claim 1, wherein, The step-down circuit is integrated into a DCDC chip.

9. The output voltage regulating circuit of claim 8, wherein, The voltage output end of the DCDC chip is connected with an inductor, and the DC output voltage is output through the inductor.

10. The output voltage regulating circuit of claim 1, wherein, The output voltage regulating circuit further comprises a diode, a positive electrode of the diode is connected with the power input end, and a negative electrode of the diode is connected with the voltage reduction circuit.

11. A motor driving device comprising the output voltage regulating circuit according to any one of claims 1-10, further comprising a motor driving chip and a motor, a voltage output end of the voltage reduction circuit is connected with the motor driving chip, the DC output voltage is provided for the motor driving chip, and the motor driving chip drives the motor.

12. The motor drive apparatus according to claim 11, characterized by: Further comprising a modulation burning circuit, the modulation burning circuit is connected with the motor driving chip through a clock signal line and a data signal line, and a grounding end of the modulation burning circuit is connected with a grounding end of the motor driving chip. Further comprising a modulation burning circuit, the modulation burning circuit is connected with the motor driving chip through a clock signal line and a data signal line, and a grounding end of the modulation burning circuit is connected with a grounding end of the motor driving chip.

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