JP2019126120A - Motor driver control device, motor control device, image forming apparatus, and motor driver control method - Google Patents

Abstract

To provide a motor driver control device which suppresses reduction in accuracy of motor control and improves noise resistance by suppressing fluctuation in duty of a PWM pulse signal with fluctuation in voltage value of a power source used for generating a triangular wave.SOLUTION: A motor driver control device is configured to control multiple switching elements for driving a motor. The motor driver control device comprises: oscillation signal generation means for generating an oscillation signal in a predetermined cycle; pulse width modulation signal generation means for generating a pulse width modulation signal by comparing the oscillation signal with a pulse generation signal; switching element control signal generation means which generates a control signal for controlling the multiple switching elements due to the pulse width modulation signal; and pulse generation signal correction means for correcting the pulse generation signal inputted to the pulse width modulation signal generation means in accordance with a voltage value used for generating the oscillation signal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor driver control device, a motor control device, an image forming apparatus, and a motor driver control method.

  Conventionally, there is known a technology in which the rotational speed of a motor can be controlled by controlling on / off of a plurality of switching elements by a control signal supplied from a motor driver control device.

  For example, Patent Document 1 below discloses, in a motor driver control device, a technique for generating a PWM pulse signal by comparing a triangular wave generated by a triangular wave oscillating circuit with a duty instruction signal input from an input terminal. It is done.

  However, in the technology of Patent Document 1 below, the duty instruction signal (analog voltage) is generated using another power supply different from the power supply used to generate the triangular wave in the outside (for example, CPU, host controller, etc.) of the motor driver control device. Value is generated. For example, even if the voltage value of the power supply used to generate the triangular wave fluctuates due to the influence of noise etc., the fluctuation of this voltage value indicates the duty It is not reflected in the signal (analog voltage value). For this reason, the duty of the PWM pulse signal generated based on the duty instruction signal fluctuates, and as a result, the accuracy of the motor control is lowered.

  In order to solve the problems of the prior art described above, the present invention reduces the accuracy of motor control by suppressing the fluctuation of the duty of the PWM pulse signal accompanying the fluctuation of the voltage value of the power supply used to generate the triangular wave. It is an object of the present invention to realize a motor driver control device which is suppressed and has high noise resistance.

  In order to solve the problems described above, a motor driver control device according to the present invention is a motor driver control device that controls a plurality of switching elements for driving a motor, and an oscillation signal for generating an oscillation signal of a predetermined cycle. Pulse width modulation signal generation means for generating a pulse width modulation signal by comparing the generation means with the oscillation signal and the pulse generation signal, and controlling the plurality of switching elements based on the pulse width modulation signal Switching element control signal generating means for generating a control signal, and pulse generation for correcting the pulse generation signal input to the pulse width modulation signal generation means according to the voltage value used for generating the oscillation signal And signal correction means.

  According to the present invention, it is possible to suppress the fluctuation of the duty of the PWM pulse signal caused by the fluctuation of the voltage value of the power supply used for generating the triangular wave. Therefore, according to the present invention, it is possible to suppress a decrease in motor control accuracy and realize a motor driver control device having high noise resistance.

It is a figure showing composition of a motor drive system concerning one embodiment of the present invention. It is a figure for demonstrating the whole operation | movement of the motor driver control apparatus which concerns on one Embodiment of this invention. It is a figure for demonstrating the influence on the PWM pulse signal by the fluctuation | variation of a voltage value. It is a figure showing the circuit composition of the AIN correction control circuit with which the motor driver control device concerning one embodiment of the present invention is provided. FIG. 1 is a diagram showing a schematic configuration of an image forming apparatus according to an embodiment of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Configuration of motor drive system 10)
FIG. 1 is a diagram showing the configuration of a motor drive system 10 according to an embodiment of the present invention. As shown in FIG. 1, the motor drive system 10 includes a motor driver control device 100, a PWM inverter 120, and a brushless motor 140. The motor driver control device 100 and the PWM inverter 120 constitute a “motor control device”.

  The motor driver control device 100 supplies a control signal to each of the plurality of switching elements 121 to 126 included in the PWM inverter 120 based on the duty instruction signal AIN input from the CPU or the host controller, to thereby select the plurality of switching elements 121. It is a device capable of controlling the rotational speed of the brushless motor 140 by controlling on / off of each of ~ 126.

  The PWM inverter 120 controls the rotational speed of the brushless motor 140 by controlling the application of a voltage to each of the U-phase, the V-phase, and the W-phase that the brushless motor 140 has. Specifically, the PWM inverter 120 is configured to include a plurality of switching elements 121 to 126. The switching elements 121 and 124 form a first arm by being directly connected to each other, and are controlled by the control signals UH and UL supplied from the motor driver control device 100 to thereby control the on / off of the brushless motor 140. Control the application of voltage to the phase. The switching elements 122 and 125 form a second arm by being directly connected to each other, and the on / off of the switching elements 122 and 125 is controlled by the control signals VH and VL supplied from the motor driver control device 100. Control the application of voltage to the phase. The switching elements 122 and 125 form a third arm by being directly connected to each other, and are controlled by the control signals WH and WL supplied from the motor driver control device 100 to control the on / off of the brushless motor 140. Control the application of voltage to the phase. The PWM inverter 120, the first arm, the second arm, and the third arm are connected in parallel to one another. As the switching elements 121 to 126, for example, an field effect transistor (FET), an insulated gate bipolar transistor (IGBT element) or the like can be used.

(Circuit configuration of motor driver control device 100)
As shown in FIG. 1, the motor driver control device 100 includes a triangular wave oscillation circuit 101, a first pulse generation circuit 102, a second pulse generation circuit 103, a PWM pulse generation circuit 104, a pulse selection circuit 105, and a switching element control signal generation circuit. 106, a phase switching signal generation circuit 107, and an AIN correction control circuit 108.

  The triangular wave oscillation circuit 101 is an example of “oscillation signal generation means”. The triangular wave oscillation circuit 101 generates a triangular wave TRO (an example of a “transmission signal”) using a voltage supplied from the power supply Vcc. The triangular wave TRO is, for example, an oscillation signal with a frequency of about 5 KHz to 100 KHz.

  The first pulse generation circuit 102 generates a first pulse signal DutyV1 having a first duty by comparing the triangular wave TRO generated by the triangular wave oscillation circuit 101 with the first DC voltage V1. Specifically, the first pulse generation circuit 102 is low during a period when the triangular wave TRO is higher than the first DC voltage V1 and is a period during which the triangular wave TRO is lower than the first DC voltage V1. Generates a first pulse signal DutyV1 that becomes high.

  The duty represents the time ratio of high to the cycle T of the PWM signal (pulse width modulation signal). For example, in the cycle T, if all the times are high, the duty is "100%". If all the times are low, the duty is "0%". If the high time is equal to the low time, the duty is Is 50%.

  The second pulse generation circuit 103 generates a second pulse signal DutyV2 having a second duty by comparing the triangular wave TRO generated by the triangular wave oscillation circuit 101 with the second DC voltage V2. Specifically, the second pulse generation circuit 103 is low during a period in which the triangular wave TRO is higher than the second DC voltage V2 and is a period during which the triangular wave TRO is lower than the second DC voltage V2. Generates a second pulse signal DutyV2 that becomes high. Here, the second DC voltage V2 is a voltage smaller than the first DC voltage V1. The second duty is a duty smaller than the first duty.

  The PWM pulse generation circuit 104 is an example of “pulse width modulation signal generation means”. The PWM pulse generation circuit 104 compares the duty instruction signal AIN (an example of the “pulse generation signal”) input from the CPU or the host controller with the triangular wave TRO generated by the triangular wave oscillation circuit 101 to obtain a PWM pulse. Generate a signal (an example of a "pulse width modulation signal"). Specifically, PWM pulse generation circuit 104 is low during a period in which triangular wave TRO is higher than duty instruction signal AIN, and is high in a period during which triangular wave TRO is lower than duty instruction signal AIN. , PWM pulse signal is generated.

  The pulse selection circuit 105 generates a PWM2 pulse signal based on the first pulse signal DutyV1, the second pulse signal DutyV2 and the PWM pulse signal. Specifically, the pulse selection circuit 105 is configured to include an AND circuit and an OR circuit. The AND circuit receives the first pulse signal DutyV1 and the PWM pulse signal, and outputs a pulse signal indicating an AND value of the first pulse signal DutyV1 and the PWM pulse signal. That is, the AND circuit outputs a pulse signal that becomes high during a period in which both the first pulse signal DutyV1 and the PWM pulse signal are high. The OR circuit receives the second pulse signal Duty V2 and the pulse signal output from the AND circuit, and outputs a pulse signal indicating the OR value of the second pulse signal Duty V2 and the pulse signal output from the AND circuit. That is, the OR circuit outputs a pulse signal that becomes high during a period in which one or both of the second pulse signal DutyV2 and the pulse signal output from the AND circuit are high. The pulse selection circuit 105 outputs the pulse signal output from the OR circuit as a PWM2 pulse signal.

  The switching element control signal generation circuit 106 is an example of “switching element control signal generation means”. Switching element control signal generation circuit 106 controls control signals UH, VH, WH, UL based on phase switching signal HP generated by phase switching signal generation circuit 107 and PWM 2 pulse signal output from pulse selection circuit 105. , VL and WL are generated. Control signals UH, VH, WH, UL, VL, and WL generated by switching element control signal generation circuit 106 are supplied to switching elements 121, 122, 123, 124, 125, and 126 included in PWM inverter 120, respectively. . The switching element control signal generation circuit 106 is a PWM inverter in order to prevent the switching elements on the high order side and the low order side of each phase (U phase, V phase, W phase) from being simultaneously turned on. It has a function of adding a dead time to the control signal supplied to 120. Further, the switching element control signal generation circuit 106 has a function of performing a brake instruction, a rotation direction instruction, a restraint protection instruction and the like to the brushless motor 140.

  The phase switching signal generation circuit 107 determines the phase in which the upper and lower PWM operation is to be performed based on the position information of the rotor of the brushless motor 140, and generates a phase switching signal HP indicating the determined phase. Phase switching signal HP generated by phase switching signal generation circuit 107 is supplied to switching element control signal generation circuit 106.

  The AIN correction control circuit 108 is an example of the “pulse generation signal correction means”. The AIN correction control circuit 108 receives the duty instruction signal AIN supplied from the CPU or the host controller and supplied to the PWM pulse generation circuit 104 to a voltage (voltage supplied from the power supply Vcc) supplied to the triangular wave oscillation circuit 101. It corrects according to the fluctuation of voltage value. Therefore, the AIN correction control circuit 108 is connected to the power supply Vcc which supplies a voltage to the triangular wave oscillating circuit 101. The details of the correction by the AIN correction control circuit 108 will be described with reference to FIG.

  The motor driver control device 100 configured as described above generates control signals UH, VH, WH, UL, VL, and WL based on the duty instruction signal AIN input from the CPU or the host controller, and these control signals are generated. UH, VH, WH, UL, VL, WL are supplied to the PWM inverter 120 to alternately turn on the high-order switching elements 121, 122, 123 and the low-order switching elements 124, 125, 126 Thus, the voltage is applied from the PWM inverter 120 to each of the U phase, the V phase, and the W phase of the brushless motor 140. Thus, the motor driver control device 100 can rotate the brushless motor 140. At this time, the motor driver control device 100 can control the rotational speed of the brushless motor 140 by controlling the length of the on time of each of the switching elements 121 to 126 by the control signal supplied to the PWM inverter 120. . At this time, the motor driver control device 100 adjusts the control signal supplied to the PWM inverter 120 based on the rotational speed of the brushless motor 140 and the like so that the rotational speed of the brushless motor 140 is a target by the duty instruction signal AIN. It is possible to carry out so-called feedback control so as to achieve speed. Since the motor driver control device 100 of this embodiment is configured to realize feedback control by an analog circuit, an analog voltage value is used as the duty instruction signal AIN input from the CPU or the host controller. There is.

(Overall operation of motor driver control device 100)
FIG. 2 is a diagram for explaining the overall operation of the motor driver control unit 100 according to the embodiment of the present invention. In motor driver control apparatus 100, PWM pulse generation circuit 104 generates a PWM pulse signal by comparing duty instruction signal AIN with triangular wave TRO. The PWM pulse signal is low during a period in which the triangular wave TRO is higher than the duty instruction signal AIN, and is high in a period during which the triangular wave TRO is lower than the duty instruction signal AIN.

  As shown in FIG. 2, when the U phase is performing the up and down PWM operation, the control signal UH of the switching element 121 on the high side of the U phase becomes the same signal as the PWM 2 pulse signal, and the switching element on the low side of the U phase UL, which is a control signal of 124, is an inverted signal of the PWM 2 pulse signal.

  Further, as shown in FIG. 2, in order to cause the current flowing from the U phase to the coil to travel to the other phase, the switching element 125 on the V phase low side and the switching element 126 on the W phase low side are The control signals VL and WL are output such that one of them is turned on and the other is turned off.

  Further, as shown in FIG. 2, when the U phase is performing the upper and lower PWM operation, in order to prevent a short circuit (arm short circuit) between the switching element 121 on the high side of U phase and the switching element 124 on the low side of U phase. When the switching elements 121 and 124 are switched on and off, a so-called dead time is provided in which both the switching elements 121 and 124 are off.

  As described above, the motor driver control device 100 generates the PWM 2 pulse signal generated based on the duty instruction signal AIN and the phase switching signal HP generated based on the position information of the rotor of the brushless motor 140. The control signals UH, UL, VH, VL, WH, and WL of the switching elements on the high order side and the low order side of each phase are generated, and these control signals are supplied to the PWM inverter 120 for switching elements By controlling on / off of 121 to 126, a DC voltage can be sequentially applied to the coils of each phase of the brushless motor 140, and the rotational speed of the brushless motor 140 can be controlled.

  In the motor driver control device 100 of this embodiment, the duty of the PWM 2 pulse signal input to the switching element control signal generation circuit 106 is an extremely small value (for example, 0%) or an extremely large value (for example, 100%) The first pulse generation circuit 102, the second pulse generation circuit 103, and the pulse selection circuit 105 are provided so as not to be.

  Specifically, in the motor driver control device 100 of the present embodiment, the duty of the PWM pulse signal generated by the PWM pulse generation circuit 104 is generated by the first pulse generation circuit 102 by the pulse selection circuit 105. The first pulse signal DutyV1 is selected as the PWM2 pulse signal if the first duty of the pulse signal DutyV1 is larger than the first duty of the pulse signal DutyV1.

  Further, in the motor driver control device 100 according to the present embodiment, the duty of the PWM pulse signal generated by the PWM pulse generation circuit 104 by the pulse selection circuit 105 is the second pulse signal generated by the second pulse generation circuit 103. If it is smaller than the second duty of Duty V2, the second pulse signal Duty V2 is selected as the PWM 2 pulse signal.

  Further, in the motor driver control device 100 of the present embodiment, the duty of the PWM pulse signal generated by the PWM pulse generation circuit 104 by the pulse selection circuit 105 is smaller than the first duty, and the second one. If the duty is larger than the duty, the PWM pulse signal is selected as the PWM2 pulse signal.

  The first duty defines a maximum duty, and can be set to any value by adjusting the first DC voltage V1 input to the first pulse generation circuit 102. The second duty defines the minimum duty, and is input to the second pulse generation circuit 103. By adjusting the second DC voltage V2, it can be set to any size.

  As described above, in the motor driver control device 100 according to the present embodiment, the duty of the PWM 2 pulse signal does not become an extremely small value (for example, 0%) or an extremely large value (for example, 100%). As a result, in the motor driver control device 100 of the present embodiment, each edge of the PWM 2 pulse signal used as a clock signal is not supplied to the switching element control signal generation circuit 106. A situation where the control signal of the element can not be generated or a situation where the brake control, the rotation direction change, the restraint protection operation and the like can not be performed do not occur.

(Effect of fluctuation of voltage value on PWM pulse signal)
FIG. 3 is a diagram for explaining the influence of the fluctuation of the voltage value on the PWM pulse signal. Here, the case where the duty is “50%” (that is, the case where the duty instruction signal AIN takes an intermediate value between triangular wave peaks) will be described as an example.

  The top level of the triangular wave TRO generated by the triangular wave oscillating circuit 101 is determined by resistance division of the voltage supplied from the power supply Vcc. For this reason, when the voltage value of the voltage supplied from the power supply Vcc fluctuates, the vertex level of the triangular wave TRO also fluctuates as shown in FIG.

  Here, in the prior art, in order to generate duty instruction signal AIN using another power supply different from power supply Vcc, if the voltage value of the other power supply is constant, the voltage value of power supply Vcc fluctuates. In any case, the voltage value of duty designation signal AIN input to PWM pulse generation circuit 104 is constant (see the dotted line in FIG. 3). In this case, as shown in FIG. 3, the duty of the PWM pulse signal generated by the PWM pulse generation circuit 104 fluctuates from "50%", and as a result, the accuracy of motor control is lowered. .

  Therefore, in the motor driver control device 100 of the present embodiment, the AIN correction control circuit 108 corrects the duty instruction signal AIN input to the PWM pulse generation circuit 104 according to the fluctuation of the voltage value of the power supply Vcc. See the solid line in FIG. As a result, as shown in FIG. 3, the duty of the PWM pulse signal generated by the PWM pulse generation circuit 104 can be kept constant at "50%", and as a result, the decrease in motor control accuracy can be suppressed. It is possible to

(Circuit configuration of AIN correction control circuit 108)
FIG. 4 is a diagram showing a circuit configuration of the AIN correction control circuit 108 provided in the motor driver control device 100 according to an embodiment of the present invention. As shown in FIG. 4, the AIN correction control circuit 108 is configured to include a resistor 401 (an example of a “first resistor”), a resistor 402 (an example of a “second resistor”), and a transistor 403. . The resistor 401 and the resistor 402 are connected in series with each other. One end of the resistor 402 is connected to the drain terminal of the transistor 403. One end of the resistor 401 is connected to the resistor 402, and the other end is connected to the power supply Vcc. The power supply Vcc is the same as the power supply Vcc for supplying a voltage to the triangular wave oscillating circuit 101 (that is, the power supply for determining the vertex level of the triangular wave TRO).

  In the AIN correction control circuit 108 configured in this way, the duty instruction signal AIN before correction is input to the gate terminal of the transistor 403, and the duty after correction is output from the output terminal provided between the resistor 401 and the resistor 402. An instruction signal AIN is output. The duty instruction signal AIN after this correction reflects the fluctuation of the voltage value of the power supply Vcc, as exemplified in FIG. As a result, the AIN correction control circuit 108 can suppress the fluctuation of the duty of the PWM pulse signal caused by the fluctuation of the voltage value of the power supply Vcc used to generate the triangular wave TRO. Therefore, the motor driver control device 100 according to the present embodiment can suppress a decrease in the accuracy of motor control, and hence can realize a motor driver control device with high noise resistance.

  The AIN correction control circuit 108 is not limited to one having the circuit configuration shown in FIG. 4 as long as it can reflect at least the fluctuation of the voltage value of the power supply Vcc in the duty instruction signal AIN.

(Example)
FIG. 5 is a schematic view of an image forming apparatus 900 according to an embodiment of the present invention. The image forming apparatus 900 shown in FIG. 5 includes a print server 910 and a main body 920. The print server 910 stores print data. Print data stored in the print server 910 is transmitted to the main body 920 according to an instruction from the user.

  The main body 920 includes an optical device 921, a photosensitive drum 922, a developing roller 923, a transfer roller 924, a transfer belt 925, a transfer roller 926, a fixing device 927, a conveying device 931, a sheet tray 932, a conveying path 933, a sheet discharge tray 934, And a recording paper 935.

  A main body 920 performs processing such as color correction, density conversion, and reduction on print data. Then, the main body 920 sends the print data that has finally become binary to the optical device 921.

  The optical device 921 uses a laser diode or the like as a laser light source. The optical device 921 irradiates the photosensitive drum 922 in a uniformly charged state with a laser beam according to the print data.

  When the photosensitive drum 922 is uniformly charged, the surface is irradiated with a laser beam corresponding to the print data, so that the charge disappears only at the portion irradiated with the laser beam. As a result, a latent image corresponding to the print data is formed on the surface of the photosensitive drum 922. The latent image formed here moves in the direction of the corresponding developing roller 923 as the photosensitive drum 922 rotates.

  The developing roller 923 adheres the toner supplied from the toner cartridge to the surface while rotating. Then, the developing roller 923 causes the toner attached to the surface to adhere to the latent image formed on the surface of the photosensitive drum 922. Thus, the developing roller 923 visualizes the latent image formed on the surface of the photosensitive drum 922 and forms a toner image on the surface of the photosensitive drum 922.

  The toner image formed on the surface of the photosensitive drum 922 is transferred onto the transfer belt 925 between the photosensitive drum 922 and the transfer roller 924. Thus, a toner image is formed on the transfer belt 925.

  In the example shown in FIG. 5, the optical device 921, the photosensitive drum 922, the developing roller 923, and the transfer roller 924 are provided for each of the four printing colors (Y, C, M, and K). As a result, toner images of the respective printing colors are formed on the transfer belt 925.

  The conveyance device 931 delivers the recording paper 935 from the paper tray 932 to the conveyance path 933. The recording paper 935 delivered to the transport path 933 is transported between the transfer belt 925 and the transfer roller 926. Thus, the toner image of each printing color formed on the transfer belt 925 is transferred onto the recording paper 935 between the transfer belt 925 and the transfer roller 926. Thereafter, heat and pressure are applied to the recording paper 935 by the fixing device 927 to fix the toner image. Then, the recording paper 935 is conveyed to the paper discharge tray 934.

  For example, in the image forming apparatus 900 configured as described above, the motor drive system 10 of the above embodiment is applied to drive various rollers (for example, a sheet feed roller, a conveyance roller, a secondary transfer roller, a fixing roller, etc.) The shaft is configured to be driven by a brushless motor 140. Then, as described in the above embodiment, control of the brushless motor 140 is performed by the motor driver control device 100. Thereby, when driving brushless motor 140 in image forming apparatus 900, duty instruction signal AIN is corrected according to the fluctuation of the voltage value of power supply Vcc used to generate triangular wave TRO. As a result, It is possible to suppress the variation of the duty of the PWM pulse signal, and to suppress the decrease in the accuracy of the motor control.

  Although the preferred embodiments and examples of the present invention have been described above in detail, the present invention is not limited to these embodiments and examples, and is within the scope of the subject matter of the present invention described in the claims. In the above, various modifications or changes are possible.

  For example, in the motor driver control device 100, a part of the circuits (except for the triangular wave oscillation circuit 101, the PWM pulse generation circuit 104, the switching element control signal generation circuit 106, and the AIN correction control circuit 108) It may be provided outside of 100.

  Further, for example, in the motor driver control device 100, a part of the circuits (except for the triangular wave oscillation circuit 101, the PWM pulse generation circuit 104, the switching element control signal generation circuit 106, and the AIN correction control circuit 108) is not provided. It may be

  Further, for example, although the example in which the present invention is applied to the image forming apparatus has been described in the above embodiment, any apparatus may be used as long as the apparatus adopts a configuration in which a motor is driven by a motor. Is also applicable.

10 motor drive system 100 motor driver control device 101 triangular wave oscillating circuit (oscillation signal generating means)
102 first pulse generation circuit 103 second pulse generation circuit 104 PWM pulse generation circuit (pulse width modulation signal generation means)
105 pulse selection circuit 106 switching element control signal generating circuit (switching element control signal generating means)
107 Phase switching signal generation circuit 108 AIN correction control circuit (signal correction means for pulse generation)
120 PWM inverter 121 to 126 switching element 140 brushless motor

JP, 2010-288333, A

Claims (6)

A motor driver control device for controlling a plurality of switching elements for driving a motor, comprising:
Oscillation signal generation means for generating an oscillation signal of a predetermined cycle;
Pulse width modulation signal generation means for generating a pulse width modulation signal by comparing the oscillation signal with a pulse generation signal;
Switching element control signal generation means for generating a control signal for controlling the plurality of switching elements based on the pulse width modulation signal;
And a pulse generation signal correction unit that corrects the pulse generation signal input to the pulse width modulation signal generation unit according to a voltage value used to generate the oscillation signal. apparatus. The pulse generation signal correction means is
The motor driver control device according to claim 1, wherein the motor driver control device is connected to a power supply used to generate the oscillation signal, and corrects the pulse generation signal based on a voltage value supplied from the power supply. The pulse generation signal correction means is
A transistor to which the pulse generation signal before correction is input from a gate terminal;
A first resistor connected to the drain terminal of the transistor;
A second resistor connected at one end to the first resistor and at the other end to the power supply;
3. The motor driver control device according to claim 2, further comprising: an output terminal provided between the first resistor and the second resistor and outputting the corrected pulse generation signal. . The plurality of switching elements;
A motor control device comprising: the motor driver control device according to any one of claims 1 to 3. The motor,
An image forming apparatus comprising the motor control device according to claim 4. A motor driver control method for controlling a plurality of switching elements for driving a motor, comprising:
An oscillation signal generation step of generating an oscillation signal of a predetermined cycle;
A pulse width modulation signal generation step of generating a pulse width modulation signal by comparing the oscillation signal with a pulse generation signal;
A switching element control signal generation step of generating a control signal for controlling the plurality of switching elements based on the pulse width modulation signal;
A pulse generation signal correction step of correcting the pulse generation signal input to the pulse width modulation signal generation step according to a voltage value used to generate the oscillation signal. Method.

Images