【特許請求の範囲】
【請求項１】 第１の定電圧を出力する第１安定化回路と、
基準電圧と出力を比較することにより第２の定電圧を出力する第２安定化回路と、
前記第１安定化回路の出力と前記第２安定化回路の出力とを比較し、該比較結果に基づいて、前記第２安定化回路の出力を制御する制御回路とを有する電源回路。
【請求項２】 前記制御回路は、前記第１安定化回路の出力が前記第１の定電圧以下のとき、前記第２安定化回路の出力を前記第１安定化回路の出力の変化に応じた電圧に制御する請求項１に記載の電源回路。
【請求項３】 前記制御回路は、前記第２安定化回路の出力より一定電圧だけ低い電圧と前記第１安定化回路の出力とを比較する請求項２に記載の電源回路。
【請求項４】 前記制御回路は、前記第２安定化回路の出力と接地間に接続された抵抗と定電流源の直列回路を有し、前記第２安定化回路の出力より前記抵抗の電位差だけ低い電圧と前記第１安定化回路の出力とを比較する請求項３に記載の電源回路。
【請求項５】 前記制御回路は、前記第２安定化回路の出力に比例した電圧と前記第１安定化回路の出力とを比較する請求項２に記載の電源回路。
【請求項６】 前記制御回路は、前記第２安定化回路の出力と接地間に接続された複数の抵抗による直列回路を有し、該直列回路による前記第２安定化回路の出力に比例した電圧と前記第１安定化回路の出力とを比較する請求項５に記載の電源回路。
【請求項７】 前記制御回路は、前記第２安定化回路の出力と接地間に接続されたトランジスタを有し、前記電源回路のオフ時に、前記比較結果に基づいて前記トランジスタを駆動し前記第２安定化回路の出力を制御する請求項２に記載の電源回路。
【請求項８】 前記制御回路は、前記第１安定化回路の出力より一定電圧だけ低い電圧と前記第２安定化回路の出力とを比較する請求項２に記載の電源回路。
【請求項９】 前記制御回路は、前記第１安定化回路の出力と接地間に接続された抵抗と定電流源の直列回路を有し、前記第１安定化回路の出力より前記抵抗の電位差だけ低い電圧と前記第２安定化回路の出力とを比較する請求項８に記載の電源回路。
【請求項１０】 前記制御回路は、前記第１安定化回路の出力の比例電圧と前記第２安定化回路の出力とを比較する請求項８に記載の電源回路。
【請求項１１】 前記制御回路は、前記第１安定化回路の出力と接地間に接続された複数の抵抗による直列回路を有し、該直列回路による前記第１安定化回路の出力に比例した電圧と前記第２安定化回路の出力とを比較する請求項１０に記載の電源回路。
【請求項１２】 前記制御回路は、前記第１安定化回路の出力の比例電圧と前記基準電圧とを比較し、該比較結果に基づいて前記制御回路出力を調整する請求項８に記載の電源回路。
【請求項１３】 マイクロコンピュータに電源を供給する為の定電圧を出力する電源安定化回路と、
基準電圧と出力を比較することにより信号変換用基準電源として定電圧を出力する基準電源安定化回路と、
前記電源安定化回路の出力と前記基準電源安定化回路の出力とを比較し、該比較結果に基づいて、該基準電源安定化回路の出力を制御する制御回路と
を有する電源回路。
【請求項１４】 入力された信号に所定の変換を行うマイクロコンピュータと、
前記マイクロコンピュータに電源を供給する為の定電圧を出力する電源安定化回路と、
基準電圧と出力を比較することにより信号変換用基準電源として定電圧を出力する基準電源安定化回路と、
前記電源安定化回路の出力と前記基準電源安定化回路の出力とを比較し、該比較結果に基づいて、該基準電源安定化回路の出力を制御する制御回路と
を有する電源回路を備えた制御装置。
[Claims]
1. A first stabilizing circuit that outputs a first constant voltage and a first stabilizing circuit.
A second stabilizing circuit that outputs a second constant voltage by comparing the reference voltage and output,
A power supply circuit including a control circuit that compares the output of the first stabilization circuit with the output of the second stabilization circuit and controls the output of the second stabilization circuit based on the comparison result.
2. When the output of the first stabilizing circuit is equal to or lower than the first constant voltage, the control circuit changes the output of the second stabilizing circuit according to a change in the output of the first stabilizing circuit. The power supply circuit according to claim 1, wherein the voltage is controlled to a voltage.
3. The power supply circuit according to claim 2, wherein the control circuit compares a voltage lower than the output of the second stabilization circuit by a constant voltage with the output of the first stabilization circuit.
4. The control circuit has a series circuit of a resistor connected between the output of the second stabilizing circuit and the ground and a constant current source, and the potential difference of the resistance from the output of the second stabilizing circuit. The power supply circuit according to claim 3, wherein a voltage as low as possible is compared with the output of the first stabilization circuit.
5. The power supply circuit according to claim 2, wherein the control circuit compares a voltage proportional to the output of the second stabilization circuit with the output of the first stabilization circuit.
6. The control circuit has a series circuit with a plurality of resistors connected between the output of the second stabilization circuit and the ground, and is proportional to the output of the second stabilization circuit by the series circuit. The power supply circuit according to claim 5, wherein the voltage is compared with the output of the first stabilization circuit.
7. The control circuit has a transistor connected between the output of the second stabilization circuit and ground, and when the power supply circuit is turned off, the transistor is driven based on the comparison result. 2. The power supply circuit according to claim 2, which controls the output of the stabilizing circuit.
8. The power supply circuit according to claim 2, wherein the control circuit compares a voltage lower than the output of the first stabilization circuit by a constant voltage with the output of the second stabilization circuit.
9. The control circuit has a series circuit of a resistor connected between the output of the first stabilizing circuit and the ground and a constant current source, and the potential difference of the resistance from the output of the first stabilizing circuit. The power supply circuit according to claim 8, wherein a voltage as low as possible is compared with the output of the second stabilization circuit.
10. The power supply circuit according to claim 8, wherein the control circuit compares a proportional voltage of the output of the first stabilizing circuit with the output of the second stabilizing circuit.
11. The control circuit has a series circuit with a plurality of resistors connected between the output of the first stabilization circuit and the ground, and is proportional to the output of the first stabilization circuit by the series circuit. The power supply circuit according to claim 10, wherein the voltage is compared with the output of the second stabilization circuit.
12. The power supply according to claim 8, wherein the control circuit compares the proportional voltage of the output of the first stabilization circuit with the reference voltage, and adjusts the control circuit output based on the comparison result. circuit.
13. A power supply stabilizing circuit that outputs a constant voltage for supplying power to a microcomputer.
A reference power supply stabilizing circuit that outputs a constant voltage as a reference power supply for signal conversion by comparing the reference voltage and output,
A power supply circuit having a control circuit that compares the output of the power supply stabilization circuit with the output of the reference power supply stabilization circuit and controls the output of the reference power supply stabilization circuit based on the comparison result.
14. A microcomputer that performs a predetermined conversion on an input signal, and
A power supply stabilizing circuit that outputs a constant voltage to supply power to the microcomputer,
A reference power supply stabilizing circuit that outputs a constant voltage as a reference power supply for signal conversion by comparing the reference voltage and output,
Control including a power supply circuit including a control circuit that compares the output of the power supply stabilizing circuit with the output of the reference power supply stabilizing circuit and controls the output of the reference power supply stabilizing circuit based on the comparison result. apparatus.