Circuit for achieving energy consumption breaking by voltage comparison and control method

The invention discloses a circuit for achieving energy consumption breaking by voltage comparison and a control method. An energy consumption braking circuit comprises a voltage comparison loop, a power amplification loop, a voltage stabilization protection loop and a state display loop, the voltage comparison loop is used for achieving comparison of an input voltage and an output voltage by a wiring terminal JP1, a triode Q1, a resistor R3, a diode D1 and a diode D2, the power amplification loop is used for achieving power amplification by a resistor R6 and a field-effect transistor Q2 and achieving energy consumption by an energy consumption resistor R1, the voltage stabilization protection loop is used for achieving voltage stabilization protection by a resistor R4 and a diode D3, the state display loop is used for achieving power indication by a resistor R2 and a light emitting diode DS1 and achieving state indication during energy consumption braking by a resistor R5 and a light emitting diode DS2. A nor