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Circuit for optimizing zener diode bias current

A zener diode, bias current technology, applied in electrical components, pulse generation, pulse technology, etc., to reduce power consumption, reduce power loss, and overcome defects

Inactive Publication Date: 2005-02-09
ASTEC INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One drawback of zener diodes, especially low voltage zener diodes, is that a constant bias current on the order of a milliamp is required to produce this nominal zener voltage

Method used

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  • Circuit for optimizing zener diode bias current
  • Circuit for optimizing zener diode bias current
  • Circuit for optimizing zener diode bias current

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Embodiment Construction

[0019] The present invention includes circuitry for a sawtooth generator that effectively controls the bias current of a zener diode that provides a reference voltage for clamping the peak voltage of the sawtooth waveform. In a preferred embodiment, the present invention provides a circuit that switches the Zener diode bias current to disconnect. Thus, the present invention overcomes the disadvantages of known circuits by significantly reducing the zener bias current required by the circuit. Refer below Figure 2-5 Further introduce the present invention.

[0020] figure 2 is a schematic diagram of an embodiment of a circuit 100 having a sawtooth generator circuit 160 and a zero-crossing detector 30 and including a bias current controller for a Zener diode in accordance with the present invention. figure 2 The circuit 100 receives an input AC voltage at terminals 6, 8 and generates a sawtooth waveform voltage signal at node 135. A zero crossing detector 30 is connected ...

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Abstract

A circuit is provided that efficiently provides the required biasing current for a Zener diode that provides a reference voltage to clamp the peak voltage of the sawtooth waveform generated by a sawtooth generator circuit. In a preferred embodiment, the present invention provides a circuit that switches the zener biasing current off, except during the short period when the referencing voltage is needed to provide the clamping function, thereby significantly reducing the current required.

Description

technical field [0001] The present invention relates to a sawtooth waveform generator circuit, and more particularly to a sawtooth generator circuit that effectively controls the bias current of a Zener diode that provides a reference voltage for limiting the peak voltage of the sawtooth waveform. Background technique [0002] Many electronic circuits require a fixed reference voltage level to be provided therein. One way of providing this reference voltage is through the use of Zener diodes. Zener diodes conduct in the forward direction like normal diodes, but do not allow the voltage across the diode to exceed the rated Zener voltage in the reverse direction. Zener voltage ratings below 4 volts are typically used for low power zener diodes. This nominal Zener voltage provides a reference voltage level. In order for a Zener diode to provide a well-regulated nominal Zener voltage, it must have a constant bias current. One drawback of Zener diodes, especially low voltage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K4/50
CPCH03K4/50
Inventor 廖志辉
Owner ASTEC INT LTD