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A multi-channel pwm drive control circuit, drive control method, and household cooking appliances

A technology for driving control circuits and control circuits, which is applied in the direction of pulse duration/width modulation, etc., can solve the problems of few PWM function modules and cannot be supported, and achieves the effect of reducing requirements and adjusting flexibly

Active Publication Date: 2019-08-30
FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing single-chip PWM function modules are few, and there are deficiencies in the current multi-PWM application. When it is necessary to realize multi-PWM output, corresponding support cannot be given.

Method used

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  • A multi-channel pwm drive control circuit, drive control method, and household cooking appliances
  • A multi-channel pwm drive control circuit, drive control method, and household cooking appliances
  • A multi-channel pwm drive control circuit, drive control method, and household cooking appliances

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1, such as figure 2As shown, the PWM output circuit adopts a single-chip microcomputer with PWM output. The current limiting circuit includes a current limiting resistor. The enable control circuit is made to be a PWM enable terminal of the single-chip microcomputer. The function control circuit includes a diode, the cathode of the diode is connected to the enabling control circuit, and the anode of the diode is connected to the driving circuit. When any PWM extension circuit needs to output low level, the function control circuit of the PWM extension circuit further includes a voltage dividing resistor, and the voltage dividing resistor is connected in parallel with the diode. The driving circuit includes a triode, and the triode is an NPN transistor, the base of the triode is connected to the common terminal of the current limiting circuit and the function control circuit, the emitter is grounded, and the collector is connected to the load circuit. The dio...

Embodiment 2

[0039] Example 2, such as image 3 As shown, the PWM output circuit adopts a single-chip microcomputer with PWM output. The current limiting circuit includes a current limiting resistor. The enable control circuit is made to be a PWM enable terminal of the single-chip microcomputer. The function control circuit includes a diode, the cathode of the diode is connected to the enabling control circuit, and the anode of the diode is connected to the driving circuit. When any PWM extension circuit needs to output low level, the function control circuit of the PWM extension circuit further includes a voltage dividing resistor, and the voltage dividing resistor is connected in parallel with the diode. The driving circuit includes a triode, the triode adopts a PNP type triode, the base of the triode is connected to the common terminal of the current limiting circuit and the function control circuit, the emitter is connected to the power supply, and the collector is connected to the l...

Embodiment 3

[0040] Example 3, such as Figure 4 As shown, when the number of expansion circuits exceeds a predetermined value, a front current drive circuit 7 is also included, and the front current drive circuit 7 includes a current limiting resistor and a triode, and the PWM output circuit is connected to the base of the triode through a current limiting resistor. pole, the emitter of the triode is connected to the power supply, and the collector is connected to each PWM expansion circuit.

[0041] When the above circuit is used for output control, the PWM output circuit outputs PWM_OUT, and each PWM expansion circuit controls the state of the enabling control circuit according to the signal requirements of the load circuit, and then controls the state of the function control circuit, through the current limiting circuit and function control The cooperation of the circuit controls the conductor and cut-off of the drive circuit, and then the load circuit outputs the required signal.

[...

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PUM

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Abstract

The present invention relates to a multi-pulse width modulation (PWM) drive control circuit, a multi-PWM drive control method, and a household cooking electric appliance. The drive control circuit comprises a PWM output circuit and multiple PWM expansion circuits connected with the PWM output circuit. Each PWM expansion circuit comprises a current limiting circuit, an enabling control circuit, a function control circuit, a drive circuit and a load circuit. The PWM output circuit is connected with the input end of the current limiting circuit of each PWM expansion circuit. The output end of the current limiting circuit is connected with the input end of the drive circuit. The output end of the drive circuit is connected with the load circuit. The enabling control circuit is connected with the input end of the drive circuit by using the function control circuit. According to the drive control circuit, one PWM output is expanded into n outputs, when any expanded branch is demanded to output a desired signal, the enabling control circuit of the branch controls the drive circuit to output three modes of signal, that is, PWM, high level and low level, the branches do not affect one another, the adjustment is flexible, and the demand on single chip resources is greatly lowered.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a multi-channel PWM drive control circuit, a drive control method and a household cooking appliance. Background technique [0002] Pulse Width Modulation PWM, the abbreviation of "Pulse Width Modulation" in English, referred to as Pulse Width Modulation, is a very effective technology that uses the digital output of a microprocessor to control analog circuits, and is widely used in measurement, communication, power In many fields of control and transformation. [0003] The PWM in the single-chip microcomputer means that some I / O ports of the single-chip microcomputer have the function of outputting PWM signals. For example, the I / O ports of some single-chip microcomputers can output clock signals, and the pulse width and duty cycle of the clock signals are adjustable, which can be set by adjusting the register bits according to actual needs. [0004] There are few P...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K7/08
Inventor 王强钟石刚袁宏斌李新峰黄兵李信合董凯
Owner FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD