A low-cost multiplication circuit and its control method

Abstract

The present invention relates to a low-cost multiplication circuit, which includes an auto-oscillation module, an analog-to-digital conversion module, a counting module, a trigger and a comparison module; a first end of the auto-oscillation module is connected to a first end of the analog-to-digital conversion module and then connected to a first end of the counting module; a first end of the analog-to-digital conversion module is connected to a first end of the trigger and then connected to a second end of the counting module; a second end of the analog-to-digital conversion module is connected to a first end of the comparison module; a third end of the counting module is connected to a second end of the comparison module; and a third end of the trigger is connected to a third end of the comparison module. The overall structure of the present invention is simple, the component cost is relatively low, and the multiplication circuit achieved has high precision.

Description

Technical Field

[0001] The present invention relates to a low-cost multiplication circuit and a control method thereof. Background Art

[0002] Currently, multiplication circuits are usually implemented by software, which requires a CPU and has a high cost. Hardware multiplication circuits are commonly implemented by analog circuits using digital-to-analog conversion and operational amplifiers, and their accuracy is low. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a low-cost multiplication circuit and a control method thereof, which have a simple overall structure, a low cost of constitution, and a high accuracy of the implemented multiplication circuit.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A low-cost multiplication circuit includes a self-oscillation module, an analog-to-digital conversion module, a counting module, a flip-flop, and a comparison module; the first end of the self-oscillation module is connected to the first end of the analog-to-digital conversion module and then connected to the first end of the counting module; the first end of the analog-to-digital conversion module is connected to the first end of the flip-flop and then connected to the second end of the counting module; the second end of the analog-to-digital conversion module is connected to the first end of the comparison module; the third end of the counting module is connected to the second end of the comparison module; the third end of the flip-flop is connected to the third end of the comparison module.

[0006] Further, the self-oscillation module uses a 4007 chip.

[0007] Further, the analog-to-digital conversion module uses an analog-to-digital conversion chip ADC7864.

[0008] Further, the first end of the self-oscillation module and the first end of the analog-to-digital conversion module are ANDed through an AND gate circuit and then input to the counting module.

[0009] Further, the first end of the analog-to-digital conversion module and the first end of the flip-flop are ANDed through an AND gate circuit and then input to the counting module.

[0010] Further, the counting module uses a 4040 chip.

[0011] Further, the comparison module includes three comparison chips 4585.

[0012] A control method for a low-cost multiplication circuit includes the following steps:

[0013] The analog-to-digital conversion module converts the input analog voltage signal into a digital signal. At the same time, the signal generated by the self-oscillation of the oscillation module is ANDed with the output end of the analog-to-digital conversion module and then input into the counting module.

[0014] The counting module calculates the input signal. The count value is compared with the digital end of the analog-to-digital conversion module through the comparison module. If the number of pulses is equal, a clock pulse of the flip-flop is multiplied by the number of pulses represented by the input voltage. At the same time, the output of the comparison module resets the flip-flop, clears the counting module, stops counting until the next clock pulse, and realizes pulse multiplication.

[0015] The present invention has the following beneficial effects compared with the prior art:

[0016] The overall structure of the present invention is simple, the composition cost is low, and the accuracy of the implemented multiplication circuit is high. Description of the Drawings

[0017] Figure 1 is the circuit principle block diagram of the present invention;

[0018] Figure 2 is the circuit diagram in an embodiment of the present invention. Detailed Embodiment

[0019] The present invention will be further described below with reference to the drawings and embodiments.

[0020] Please refer to Figure 1 , the present invention provides a low-cost multiplication circuit, including a self-oscillation module, an analog-to-digital conversion module, a counting module, a flip-flop and a comparison module; the first end of the self-oscillation module is connected to the first end of the analog-to-digital conversion module and then connected to the first end of the counting module; the first end of the analog-to-digital conversion module is connected to the first end of the flip-flop and then connected to the second end of the counting module; the second end of the analog-to-digital conversion module is connected to the first end of the comparison module; the third end of the counting module is connected to the second end of the comparison module; the third end of the flip-flop is connected to the third end of the comparison module.

[0021] Refer to Figure 2 , in the control method of a low-cost multiplication circuit in this embodiment, it includes the following steps:

[0022] Use the analog-to-digital conversion chip ADC7864 to convert the input analog voltage signal into a digital signal. At the same time, the signal generated by the self-oscillation of the 4007 chip is ANDed with the end-of-conversion output EOC of the ADC7864 chip, and the 4040 chip is used to count it;

[0023] The count value is compared with the digital terminal of ADC7864 through the comparison chip 4585. If the number of pulses is equal, it means that one clock pulse of the D flip-flop 4013 is multiplied by the number of pulses represented by the input voltage. At the same time, the output of the comparison chip 4585 resets the D flip-flop 4013, clears the counter chip 4040, and stops counting until the next clock pulse, thus realizing the pulse multiplication function.

[0024] The above are only the preferred embodiments of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims

1. A low-cost multiplication circuit, characterized in that, It includes a self-oscillation module, an analog-to-digital conversion module, a counting module, a trigger, and a comparison module; the first end of the self-oscillation module is connected to the first end of the analog-to-digital conversion module and then connected to the first end of the counting module; the first end of the analog-to-digital conversion module is connected to the first end of the trigger and then connected to the second end of the counting module; the second end of the analog-to-digital conversion module is connected to the first end of the comparison module; the third end of the counting module is connected to the second end of the comparison module; the third end of the trigger is connected to the third end of the comparison module; The first end of the self-oscillation module and the first end of the analog-to-digital conversion module are ANDed through an AND gate circuit and then input to the counting module; The first end of the analog-to-digital conversion module and the first end of the trigger are ANDed through an AND gate circuit and then input to the counting module; The control method of the low-cost multiplication circuit includes the following steps: The analog-to-digital conversion module converts the input analog voltage signal into a digital signal. At the same time, the signal generated by the self-excitation oscillation of the oscillation module is ANDed with the output end of the analog-to-digital conversion module and then input to the counting module; The counting module calculates the input signal. The count value is compared with the digital end of the analog-to-digital conversion module through the comparison module. If the number of pulses is equal, a clock pulse of the trigger is multiplied by the number of pulses represented by the input voltage. At the same time, the output of the comparison module resets the trigger, clears the counting module, stops counting until the next clock pulse, and realizes pulse multiplication.

2. The low-cost multiplication circuit according to claim 1, wherein The self-oscillation module uses a 4007 chip.

3. The low-cost multiplication circuit according to claim 1, wherein The analog-to-digital conversion module uses an analog-to-digital conversion chip ADC7864.

4. A low-cost multiplication circuit according to claim 1, characterized in that, The counting module uses a 4040 chip.

5. A low-cost multiplication circuit according to claim 1, wherein, The comparison module includes three comparison chips 4585.

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