CONTROL SIGNAL MODULATION CIRCUIT, INVERTER, AND CONTROL SYSTEM

Provided are a control signal modulation circuit (210, 410), an inverter (220, 430, 610), and a control system, wherein the control signal modulation circuit (210, 410) is achieved on the basis of a DC/DC boost circuit (120, 310, 320, 420), the DC/DC boost circuit (120, 310, 320, 420) comprises a controllable switch circuit (1), and by means of said controllable switch circuit (1), a loop wherein a second capacitor (C2) charges a first capacitor (C1) is achieved. When the voltage on the first capacitor (C1) reaches a first voltage threshold, the switch state of a first controllable switch (K1) is controlled, so that a control signal of a preset characteristic waveform is generated on the first capacitor (C1). The control signal of the preset characteristic waveform is generated by means of a charging and discharging process of the first capacitor (C1) in the DC/DC boost circuit (120, 310, 320, 420), and therefore, there is no need for a dedicated signal generator, and an electric carrier communication module does not need to be provided. As a result, the hardware cost is low. Moreover, compared to a wireless communication means, the control signal generated by the control signal modulation circuit is not affected by distance, does not have the crosstalk phenomenon, and does not have special requirements for the terrain of an installation site.