Control circuit and flash system using same
First Claim
1. A control circuit configured to control the charge and discharge of a flash unit, comprising:
- a charging circuit coupled to a charging terminal, comprising;
a first diode comprising an anode coupled to the charging terminal and a cathode coupled to the flash unit;
a first resistor comprising a first terminal coupled to the anode of the first diode and a second terminal;
a first capacitor comprising a first terminal coupled to the second terminal of the first resistor and a second terminal;
a second resistor comprising a first terminal coupled to the second terminal of the first capacitor and a second terminal being ground;
a second capacitor comprising a first terminal coupled to the cathode of the first diode and a second terminal;
a third resistor comprising a first terminal coupled to the second terminal of the second capacitor and a second terminal being ground;
a first switching element comprising a first terminal coupled to the anode of the first diode, a second terminal coupled to the second terminal of the second capacitor, and a control terminal; and
a second diode comprising an anode coupled to the flash unit and a cathode coupled to the control terminal of the first switching element; and
a triggering circuit coupled to a trigger terminal, comprising;
a second switching element comprising a first terminal being grounded, a second terminal coupled to cathode of the second diode and the second terminal of the first resistor, and a control terminal coupled to the trigger terminal;
a third capacitor comprising a first terminal coupled to the second terminal of the first resistor and a second terminal; and
a transformer comprising a primary winding coupled to the second terminal of the third capacitor and a secondary winding coupled to the flash unit.
1 Assignment
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Accused Products
Abstract
A control circuit is configured to control the charge and discharge of a flash unit. The flash unit includes an anode, a cathode, and a trigger electrode. The control circuit includes a charging circuit and a triggering circuit. One terminal of the charging circuit is coupled to a charging terminal and another terminal is coupled to the anode and the cathode. One terminal of the triggering circuit is coupled to a triggering terminal, another terminal is couple to the trigger electrode. The charging circuit includes a first capacitor coupled to the cathode and a second capacitor coupled to the anode. When the charging terminal receives a charging voltage and the triggering terminal receives a high-level voltage, three times charging voltage is formed between the anode and the cathode; then the flash unit generates a flash.
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Citations
10 Claims
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1. A control circuit configured to control the charge and discharge of a flash unit, comprising:
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a charging circuit coupled to a charging terminal, comprising; a first diode comprising an anode coupled to the charging terminal and a cathode coupled to the flash unit; a first resistor comprising a first terminal coupled to the anode of the first diode and a second terminal; a first capacitor comprising a first terminal coupled to the second terminal of the first resistor and a second terminal; a second resistor comprising a first terminal coupled to the second terminal of the first capacitor and a second terminal being ground; a second capacitor comprising a first terminal coupled to the cathode of the first diode and a second terminal; a third resistor comprising a first terminal coupled to the second terminal of the second capacitor and a second terminal being ground; a first switching element comprising a first terminal coupled to the anode of the first diode, a second terminal coupled to the second terminal of the second capacitor, and a control terminal; and a second diode comprising an anode coupled to the flash unit and a cathode coupled to the control terminal of the first switching element; and a triggering circuit coupled to a trigger terminal, comprising; a second switching element comprising a first terminal being grounded, a second terminal coupled to cathode of the second diode and the second terminal of the first resistor, and a control terminal coupled to the trigger terminal; a third capacitor comprising a first terminal coupled to the second terminal of the first resistor and a second terminal; and a transformer comprising a primary winding coupled to the second terminal of the third capacitor and a secondary winding coupled to the flash unit. - View Dependent Claims (2, 3, 4, 5)
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6. A flash system comprising:
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a flash unit comprising; a flash tube comprising an anode, a cathode, and a triggering electrode; a charging capacitor comprising a first terminal be grounded and a second terminal coupled to the anode of the flash tube; a control circuit comprising; a charging circuit coupled to a charging terminal, comprising; a first diode comprising an anode coupled to the charging terminal and a cathode coupled to the anode of the flash tube; a first resistor comprising a first terminal coupled to the anode of the first diode and a second terminal; a first capacitor comprising a first terminal coupled to the second terminal of the first resistor and a second terminal; a second resistor comprising a first terminal coupled to the second terminal of the first capacitor and a second terminal being ground; a second capacitor comprising a first terminal coupled to the cathode of the first diode and a second terminal; a third resistor comprising a first terminal coupled to the second terminal of the second capacitor and a second terminal being ground; a first switching element comprising a first terminal coupled to the anode of the first diode, a second terminal coupled to the second terminal of the second capacitor, and a control terminal; and a second diode comprising an anode coupled to the cathode of the flash tube and the cathode coupled to the control terminal of the first switching element; and a triggering circuit coupled to a trigger terminal, comprising; a second switching element comprising a first terminal being grounded, a second terminal coupled to cathode of the second diode and the second terminal of the first resistor, and a control terminal coupled to the trigger terminal; a third capacitor comprising a first terminal coupled to the second terminal of the first resistor and a second terminal; and a transformer comprising a primary winding coupled to the second terminal of the third capacitor and a secondary winding coupled to the trigger terminal of the flash tube. - View Dependent Claims (7, 8, 9, 10)
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Specification