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H bridge chopper circuit
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A chopper circuit, main circuit technology, applied in electrical components, output power conversion devices, conversion of AC power input to DC power output, etc. problem, to achieve the effect of improving energy utilization efficiency
Active Publication Date: 2017-12-19
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[0002] At present, the H-bridge chopper circuit is widely used, because its circuit shape resembles the letter H, so it is named "H-bridge". The intermittent on-off of the switch makes the conduction state of the H-bridge change, so as to obtain the output electrical signal with the required waveform. However, there are some defects in the H-bridge circuit in the application. When the load is a capacitive load, the H-bridge In a complete cycle of the load, the capacitive load is charged when the H-bridge is outputting in the forward direction. When the H-bridge is outputting in the reverse direction, it is necessary to offset the charge on the capacitive load before the load can work normally, thus causing the overall circuit to work The efficiency is low, the heat generated by the tube in the circuit is large, and it is easy to be damaged
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specific Embodiment 1
[0040] Situation 1, OUTACL and OUTACN are connected with capacitive load, and start to work
[0041] 1), conduction 1 period:
[0042] a. The controller turns on V1, V4, and turns off V2, V3, then the current on the load passes through V1, L1, load L2, V4, R14, that is, Figure 11 The circuit formed is flowing. Since the load is capacitive and L1 and L2 are inductive, the current of the entire circuit will gradually increase, the voltage at both ends of the load will gradually increase, and the voltage at both ends of R14 will gradually increase. At this time, two situations will occur:
[0043] a1: If the voltage at both ends of R14 reaches the preset value, then V4 is turned off (switching tube status: V1 is on, V2, V3, and V4 are off), since the current of L1 and L2 is not 0, the current will pass through V1, L1, load, L2 and D8 form a loop, such as Figure 12 , to supply power to the load, and at the same time, the current of L1 and L2 gradually decreases. This state has...
specific Embodiment 2
[0065] Embodiment 2, as a further improvement of the present invention, in order to solve the situation that the capacitive load causes the voltage at the load pin to rise beyond the HVDC value (in the case of a capacitive load, the inductance and the capacitor have resonance when charging the capacitor, and the resonance voltage If it is too high, the output voltage will be too high and the load will be easily damaged, so two diode clamps are added to clamp the voltage at HVDC, so as not to increase), the protection unit also includes a diode D4, which is connected in series with the load lead Between the pin OUTACL and the input pin HVDC and its conduction direction points to the input pin HVDC along the load pin OUTACL, and the diode D4 is used as a freewheeling diode. When V1 and V4 are turned on for normal output in the conduction period 1, the load After charging, the voltage of OUTANL continues to rise. When the positive voltage of D4 - the negative voltage of D4 > the c...
specific Embodiment 3
[0066] In a specific embodiment 3, the protection unit further includes a diode D6, which is connected in series between the load pin OUTACN and the input pin HVDC, and its conduction direction is along the load pin OUTACN to the input pin HVDC. The added D6 ensures the safety of the device during the 2-cycle conduction.
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Abstract
The invention relates to an H bridgechopper circuit and belongs to the field of driving circuits. In a classical H bridge circuit, a protecting unit thereof is improved. The H bridgechopper circuit comprises a diode D5, a diode D7 and an energy storage, wherein the diode D5 is serially connected between a load pin OUTACL and a power supply ground; a conduction direction of the diode D5 is pointed to the load pin OUTACL along the power supply ground; the diode D7 is serially connected between the load pin OUTACN and the power supply ground; conduction direction of the diode D7 is pointed to the load pin OUTACN along the power supply ground; the energy storage is serially connected between an input pin HVDC and the power supply ground. According to the invention, energy feedback channels are formed by the additionally arranged diodes on the basis of the classical H bridge; these energy feedback channels are utilized to close the output under the state of load short circuit when the load is a capacitive load harmful to the circuit; the load energy is stored and is inversely outputted to the load for use under the load working state when the load is the capacitive load; the energy utilization efficiency is increased.
Description
technical field [0001] The invention belongs to the field of drive circuits, and in particular relates to an H-bridge chopper circuit. Background technique [0002] At present, the H-bridge chopper circuit is widely used, because its circuit shape resembles the letter H, so it is named "H-bridge". The intermittent on-off of the switch makes the conduction state of the H-bridge change, so as to obtain the output electrical signal with the required waveform. However, there are some defects in the H-bridge circuit in the application. When the load is a capacitive load, the H-bridge In a complete cycle of the load, the capacitive load is charged when the H-bridge is outputting in the forward direction. When the H-bridge is outputting in the reverse direction, it is necessary to offset the charge on the capacitive load before the load can work normally, thus causing the overall circuit to work The efficiency is low, and the tubes in the circuit generate a lot of heat and are eas...
Claims
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Application Information
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