A kind of active discharge circuit and discharge device
A technology of a discharge circuit and a discharge device, applied in the field of circuits, can solve the problems of large volume and high cost of a relay control circuit
Active Publication Date: 2019-03-08
SHENZHEN LONGTECH SMART CONTROL CO LTD
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Problems solved by technology
The invention solves the technical problems of high cost and large volume of the relay control circuit
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[0040] In order to make the object, technical solution and advantages of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0041] On the basis of the existing technology, an active discharge circuit is added to the discharge device, which replaces the relay control circuit in the prior art, and can also discharge the residual voltage of the large-capacity capacitor when the power is off, and work normally. state produces less power consumption. The active discharge circuit in the present invention utilizes the AC and DC characteristics of the bidirectional thyristor and the resistive capacitor device. When the AC voltage is continuously applied in the working state, the active discharge circuit does not work...
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The invention discloses an active discharge circuit and a discharge device. The active discharge circuit comprises a first capacitor, a second capacitor, a bidirectional silicon controlled rectifier, a bidirectional trigger diode, a first resistor, a second resistor and a third resistor; when an AC voltage is disconnected, the first capacitor charges the second capacitor through the first resistor; when the voltage of the second capacitor is larger than a conduction voltage of the bidirectional trigger diode, a path formed by the bidirectional silicon rectifier and the third resistor is used for relieving charges stored by the first capacitor; and when the voltage of the second capacitor is reduced to a cutoff voltage of the bidirectional silicon controlled rectifier, the bidirectional silicon controlled rectifier is cut off, and the discharging is finished. By the power generation circuit, the charges in a large-capacity capacitor in the circuit can be rapidly relieved without causing obvious increase on standby power consumption; and the active discharge circuit is employed to substitute a discharge circuit controlled by a relay control circuit, the relay control circuit is not needed, the circuit is simplified, and the cost is reduced.
Description
technical field [0001] The invention relates to the field of circuit technology, in particular to an active discharge circuit and a discharge device. Background technique [0002] There are high-power switching devices in products such as electromagnetic heating equipment, ultrasonic processing equipment, and high-power switching power supplies, such as figure 1 As shown, it is often necessary to connect a large-capacity capacitor at the input end of the power supply to suppress differential-mode interference. [0003] After unplugging the power plug, there is residual voltage in the bulk capacitor. For many types of home appliances, the safety regulations "GB4706.1 Safety of Household and Similar Electrical Appliances" or "IEC60335-1" have residual voltage requirements, that is, after the power plug is unplugged, the residual voltage of the large-capacity capacitor must be It falls below 34V within 1s. Such as figure 2 As shown, in the existing product design, the blee...
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IPC IPC(8): H02H9/04H02J7/34
CPCH02H9/047H02J7/345
Inventor 苏培涛盘耀东欧阳正良苏周浩然
Owner SHENZHEN LONGTECH SMART CONTROL CO LTD